$GPK
GRAPHIC PACKAGING HOLDING CO Stock $gpk

$gpk Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000140807521000012 Filed on February 16, 2021

Income Statement

Concept	2020 Q4	2020 Q3	2020 Q2
Revenue	$1.652B	$1.698B	$1.611B
YoY Change	8.71%	7.36%	3.75%
Cost Of Revenue	$1.390B	$1.442B	$1.349B
YoY Change	11.45%	9.64%	6.64%
Gross Profit	$261.8M	$255.5M	$262.1M
YoY Change	-3.86%	-4.09%	-8.93%
Gross Profit Margin	15.85%	15.05%	16.27%
Selling, General & Admin	$118.5M	$126.0M	$132.0M
YoY Change	-4.44%	-4.04%	0.15%
% of Gross Profit	45.26%	49.32%	50.36%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$119.3M	$121.0M	$122.0M
YoY Change	9.05%	9.5%	10.71%
% of Gross Profit	45.57%	47.36%	46.55%
Operating Expenses	$118.3M	$126.0M	$132.0M
YoY Change	-5.89%	-4.04%	0.15%
Operating Profit	$130.4M	$119.0M	$115.0M
YoY Change	-1.95%	-3.02%	-20.36%
Interest Expense	-$32.40M	$32.00M	$30.00M
YoY Change	-5.26%	-10.86%	-15.49%
% of Operating Profit	-24.85%	26.89%	26.09%
Other Income/Expense, Net	-$700.0K	$200.0K	$600.0K
YoY Change	-98.22%
Pretax Income	$97.30M	$87.00M	$85.00M
YoY Change	63.8%	0.23%	-21.95%
Income Tax	$20.40M	$8.000M	$18.00M
% Of Pretax Income	20.97%	9.2%	21.18%
Net Earnings	$64.20M	$64.00M	$52.00M
YoY Change	94.55%	22.84%	-18.5%
Net Earnings / Revenue	3.89%	3.77%	3.23%
Basic Earnings Per Share	$0.24	$0.23	$0.19
Diluted Earnings Per Share	$0.24	$0.23	$0.19
COMMON SHARES
Basic Shares Outstanding	270.8M shares	277.0M shares	279.9M shares
Diluted Shares Outstanding		277.7M shares	280.5M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$179.0M	$55.50M	$83.60M
YoY Change	17.07%	13.96%	29.21%
Cash & Equivalents	$179.0M	$55.50M	$83.60M
Short-Term Investments
Other Short-Term Assets	$59.00M	$65.70M	$76.50M
YoY Change	12.81%	19.02%	34.92%
Inventory	$1.128B	$1.154B	$1.198B
Prepaid Expenses
Receivables	$597.0M	$743.4M	$692.4M
Other Receivables	$57.00M	$0.00	$0.00
Total Short-Term Assets	$2.020B	$2.018B	$2.050B
YoY Change	11.87%	13.97%	10.17%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.560B	$3.437B	$3.379B
YoY Change	9.41%	7.15%	5.63%
Goodwill	$1.478B	$1.470B	$1.466B
YoY Change	0.0%	19498.67%	-0.08%
Intangibles	$437.0M	$447.8M	$460.9M
YoY Change	-8.44%	-6.9%	-5.05%
Long-Term Investments
YoY Change
Other Assets	$310.0M	$308.5M	$310.3M
YoY Change	12.6%	16.11%	13.87%
Total Long-Term Assets	$5.785B	$5.664B	$5.616B
YoY Change	5.48%	4.43%	3.54%
TOTAL ASSETS
Total Short-Term Assets	$2.020B	$2.018B	$2.050B
Total Long-Term Assets	$5.785B	$5.664B	$5.616B
Total Assets	$7.805B	$7.682B	$7.666B
YoY Change	7.06%	6.78%	5.23%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$825.0M	$738.5M	$681.8M
YoY Change	15.21%	17.46%	5.75%
Accrued Expenses	$534.4M	$485.4M	$447.8M
YoY Change	26.13%	20.87%	16.49%
Deferred Revenue
YoY Change
Short-Term Debt	$3.000M	$0.00	$0.00
YoY Change	-67.74%
Long-Term Debt Due	$489.0M	$495.8M	$483.2M
YoY Change	1239.73%	811.4%	720.37%
Total Short-Term Liabilities	$1.856B	$1.720B	$1.613B
YoY Change	54.83%	57.51%	47.42%
LONG-TERM LIABILITIES
Long-Term Debt	$3.147B	$3.197B	$3.029B
YoY Change	12.0%	8.92%	1.04%
Other Long-Term Liabilities	$292.0M	$295.8M	$292.7M
YoY Change	9.45%	11.96%	8.57%
Total Long-Term Liabilities	$3.439B	$3.493B	$3.322B
YoY Change	11.78%	9.17%	1.67%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.856B	$1.720B	$1.613B
Total Long-Term Liabilities	$3.439B	$3.493B	$3.322B
Total Liabilities	$5.295B	$5.212B	$4.934B
YoY Change	23.85%	21.47%	13.14%
SHAREHOLDERS EQUITY
Retained Earnings	-$48.00M	-$52.00M	-$37.10M
YoY Change	-185.11%	-215.3%	-183.0%
Common Stock	$1.715B	$1.732B	$1.841B
YoY Change	-8.62%	-8.89%	-3.94%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.424B	$1.428B	$1.521B
YoY Change
Total Liabilities & Shareholders Equity	$7.805B	$7.682B	$7.666B
YoY Change	7.07%	6.78%	5.23%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	$64.20M	$64.00M	$52.00M
YoY Change	94.55%	22.84%	-18.5%
Depreciation, Depletion And Amortization	$119.3M	$121.0M	$122.0M
YoY Change	9.05%	9.5%	10.71%
Cash From Operating Activities	$435.5M	$245.4M	$223.1M
YoY Change	19.28%	1.87%	-3.79%
INVESTING ACTIVITIES
Capital Expenditures	-$220.6M	-$119.1M	-$153.5M
YoY Change	79.35%	66.34%	96.04%
Acquisitions
YoY Change
Other Investing Activities	$49.70M	$30.90M	-$59.40M
YoY Change	147.26%	-177.64%	-336.65%
Cash From Investing Activities	-$170.9M	-$88.20M	-$212.9M
YoY Change	66.08%	-20.83%	300.19%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-144.5M	-187.9M	-38.10M
YoY Change	-9.69%	30.12%	-78.46%
NET CHANGE
Cash From Operating Activities	435.5M	245.4M	223.1M
Cash From Investing Activities	-170.9M	-88.20M	-212.9M
Cash From Financing Activities	-144.5M	-187.9M	-38.10M
Net Change In Cash	120.1M	-30.70M	-27.90M
YoY Change	17.51%	106.04%	-1650.0%
FREE CASH FLOW
Cash From Operating Activities	$435.5M	$245.4M	$223.1M
Capital Expenditures	-$220.6M	-$119.1M	-$153.5M
Free Cash Flow	$656.1M	$364.5M	$376.6M
YoY Change	34.42%	16.64%	21.41%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtNoncurrent
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtNoncurrent
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001408075
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020Q1	gpk	Restructuring And Related Costs Term Of Program RestructuringAndRelatedCostsTermOfProgram	P3Y
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssets
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssets
CY2019Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesCurrent
CY2020Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesCurrent
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2020Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:DebtCurrent
CY2019Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:DebtCurrent
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020Q4	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-33988
CY2020	dei	Entity Registrant Name EntityRegistrantName	Graphic Packaging Holding Co
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	26-0405422
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	1500 Riveredge Parkway, Suite 100
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Atlanta
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	GA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	30328
CY2020	dei	City Area Code CityAreaCode	770
CY2020	dei	Local Phone Number LocalPhoneNumber	240-7200
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value per share
CY2020	dei	Trading Symbol TradingSymbol	GPK
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	3900000000	USD
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	267755764	shares
CY2020Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	8	paperboard_mill
CY2020	us-gaap	Revenues Revenues	6559900000	USD
CY2019	us-gaap	Revenues Revenues	6160100000	USD
CY2018	us-gaap	Revenues Revenues	6029400000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	524300000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	534100000	USD
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CY2020	us-gaap	Revenues Revenues	6559900000	USD
CY2019	us-gaap	Revenues Revenues	6160100000	USD
CY2018	us-gaap	Revenues Revenues	6029400000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5459700000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5067500000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	5077000000.0	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	512600000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	511800000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	472100000	USD
CY2020	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-2000000.0	USD
CY2019	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-8800000	USD
CY2018	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-7200000	USD
CY2020	gpk	Business Combinations Gain Loss On Sale Of Assets And Shutdown And Other Special Charges Net BusinessCombinationsGainLossOnSaleOfAssetsAndShutdownAndOtherSpecialChargesNet	61300000	USD
CY2019	gpk	Business Combinations Gain Loss On Sale Of Assets And Shutdown And Other Special Charges Net BusinessCombinationsGainLossOnSaleOfAssetsAndShutdownAndOtherSpecialChargesNet	37900000	USD
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CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	524300000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	534100000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	458200000	USD
CY2020	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	151500000	USD
CY2019	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	39500000	USD
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CY2020	us-gaap	Interest Expense InterestExpense	128800000	USD
CY2019	us-gaap	Interest Expense InterestExpense	140600000	USD
CY2018	us-gaap	Interest Expense InterestExpense	123700000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1900000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	244000000.0	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	354000000.0	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	347500000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	41600000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	76300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	54700000	USD
CY2020	gpk	Income Loss Before Equity Income Of Unconsolidated Entities IncomeLossBeforeEquityIncomeOfUnconsolidatedEntities	202400000	USD
CY2019	gpk	Income Loss Before Equity Income Of Unconsolidated Entities IncomeLossBeforeEquityIncomeOfUnconsolidatedEntities	277700000	USD
CY2018	gpk	Income Loss Before Equity Income Of Unconsolidated Entities IncomeLossBeforeEquityIncomeOfUnconsolidatedEntities	292800000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	900000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	400000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1200000	USD
CY2020	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	203300000	USD
CY2019	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	278100000	USD
CY2018	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	294000000.0	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	36000000.0	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	71300000	USD
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CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
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CY2019	us-gaap	Net Income Loss NetIncomeLoss	206800000	USD
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CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
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CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
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CY2020	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-3200000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	3500000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest	700000	USD
CY2020	gpk	Other Comprehensive Income Loss Cash Flow Hedges Gain Loss After Reclassification And Tax Nonredeemable Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgesGainLossAfterReclassificationAndTaxNonredeemableNoncontrollingInterest	-100000	USD
CY2020	gpk	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Including Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxIncludingRedeemableNoncontrollingInterest	4100000	USD
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CY2020	gpk	Other Comprehensive Income Loss Defined Benefit Plan After Tax And Reclassification Adjustment Attributable To Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossDefinedBenefitPlanAfterTaxAndReclassificationAdjustmentAttributableToRedeemableNoncontrollingInterest	-9500000	USD
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CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	16500000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	1700000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	160600000	USD
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CY2020	gpk	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	5700000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	363900000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	206800000	USD
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CY2019	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	278100000	USD
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CY2019	gpk	Other Comprehensive Income Loss Cash Flow Hedges Gain Loss After Reclassification And Tax Nonredeemable Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgesGainLossAfterReclassificationAndTaxNonredeemableNoncontrollingInterest	-400000	USD
CY2019	gpk	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Including Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxIncludingRedeemableNoncontrollingInterest	-7200000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-7600000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-2300000	USD
CY2019	gpk	Other Comprehensive Income Loss Defined Benefit Plan After Tax And Reclassification Adjustment Attributable To Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossDefinedBenefitPlanAfterTaxAndReclassificationAdjustmentAttributableToRedeemableNoncontrollingInterest	-700000	USD
CY2019	gpk	Other Comprehensive Income Loss Defined Benefit Plan After Reclassification Adjustment After Tax Including Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossDefinedBenefitPlanAfterReclassificationAdjustmentAfterTaxIncludingRedeemableNoncontrollingInterest	-10600000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	9800000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	2100000	USD
CY2019	gpk	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToRedeemableNoncontrollingInterest	500000	USD
CY2019	gpk	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Including Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxIncludingRedeemableNoncontrollingInterest	12400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12100000	USD
CY2019	gpk	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Nonredeemable Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNonredeemableNoncontrollingInterest	2900000	USD
CY2019	gpk	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToRedeemableNoncontrollingInterest	800000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	15800000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	218900000	USD
CY2019	gpk	Comprehensive Income Loss Net Of Tax Attributable To Nonredeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToNonredeemableNoncontrollingInterest	57900000	USD
CY2019	gpk	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	17100000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	293900000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	221100000	USD
CY2018	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	56300000	USD
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	16600000	USD
CY2018	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	294000000.0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	-1000000.0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest	-200000	USD
CY2018	gpk	Other Comprehensive Income Loss Cash Flow Hedges Gain Loss After Reclassification And Tax Nonredeemable Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgesGainLossAfterReclassificationAndTaxNonredeemableNoncontrollingInterest	-100000	USD
CY2018	gpk	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Including Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxIncludingRedeemableNoncontrollingInterest	-1300000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	19400000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	4700000	USD
CY2018	gpk	Other Comprehensive Income Loss Defined Benefit Plan After Tax And Reclassification Adjustment Attributable To Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossDefinedBenefitPlanAfterTaxAndReclassificationAdjustmentAttributableToRedeemableNoncontrollingInterest	1400000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	179000000.0	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	152900000	USD
CY2020Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	654400000	USD
CY2018	gpk	Other Comprehensive Income Loss Defined Benefit Plan After Reclassification Adjustment After Tax Including Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossDefinedBenefitPlanAfterReclassificationAdjustmentAfterTaxIncludingRedeemableNoncontrollingInterest	25500000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-18700000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-4500000	USD
CY2018	gpk	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToRedeemableNoncontrollingInterest	-1300000	USD
CY2018	gpk	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Including Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxIncludingRedeemableNoncontrollingInterest	-24500000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-39100000	USD
CY2018	gpk	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Nonredeemable Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNonredeemableNoncontrollingInterest	-9400000	USD
CY2018	gpk	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToRedeemableNoncontrollingInterest	-2800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-51300000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	182000000.0	USD
CY2018	gpk	Comprehensive Income Loss Net Of Tax Attributable To Nonredeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToNonredeemableNoncontrollingInterest	46900000	USD
CY2018	gpk	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	13800000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	242700000	USD
CY2019Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	504500000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	1127600000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	1095900000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	59200000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	52300000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	2020200000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	1805600000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	3560000000.0	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	3253800000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1477600000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1477900000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	436900000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	477300000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	309900000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	275300000	USD
CY2020Q4	us-gaap	Assets Assets	7804600000	USD
CY2019Q4	us-gaap	Assets Assets	7289900000	USD
CY2020Q4	us-gaap	Debt Current DebtCurrent	497200000	USD
CY2019Q4	us-gaap	Debt Current DebtCurrent	50400000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	825000000.0	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	716100000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	213100000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	168400000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	30300000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	24700000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	291000000.0	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	239100000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1856600000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1198700000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3147000000.0	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2809900000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	539600000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	511800000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	129800000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	140400000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	291300000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	266800000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	0	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	304300000	USD
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	267726373	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	267726373	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	290246907	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	290246907	shares
CY2020Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	2700000	USD
CY2019Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	2900000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1714600000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1876700000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-47100000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	56400000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-245900000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-365800000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1424300000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1570200000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	416000000.0	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	487800000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1840300000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2058000000.0	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7804600000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7289900000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1291900000	USD
CY2018	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	732400000	USD
CY2018	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	277400000	USD
CY2018	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	-12500000	USD
CY2018	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-19400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-1200000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	24100000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-23200000	USD
CY2018	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	120000000.0	USD
CY2018	us-gaap	Dividends Dividends	92300000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9500000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2018500000	USD
CY2019	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	261800000	USD
CY2019	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	-12500000	USD
CY2019	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-30200000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	21600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-6800000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-9900000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	11900000	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	127900000	USD
CY2019	us-gaap	Dividends Dividends	87700000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	17600000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2058000000.0	USD
CY2020	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	206500000	USD
CY2020	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	12200000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	19300000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	3500000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxNoncontrollingInterest	700000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	4200000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-99900000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-29400000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-129300000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	16500000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	1700000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	18200000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	315600000	USD
CY2020	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	210900000	USD
CY2020	gpk	Noncontrolling Interest Tax Effect From Redemption NoncontrollingInterestTaxEffectFromRedemption	16000000.0	USD
CY2020	us-gaap	Dividends Dividends	83000000.0	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	24700000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1840300000	USD
CY2020	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	203300000	USD
CY2019	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	278100000	USD
CY2018	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	294000000.0	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	475800000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	447200000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	430600000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5700000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4700000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4400000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-700000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	52700000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	26000000.0	USD
CY2020	gpk	Postretirement Benefit Period Expense Greater Less Than Funding PostretirementBenefitPeriodExpenseGreaterLessThanFunding	147100000	USD
CY2019	gpk	Postretirement Benefit Period Expense Greater Less Than Funding PostretirementBenefitPeriodExpenseGreaterLessThanFunding	41500000	USD
CY2018	gpk	Postretirement Benefit Period Expense Greater Less Than Funding PostretirementBenefitPeriodExpenseGreaterLessThanFunding	-4700000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	38600000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-12900000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-15100000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-35300000	USD
CY2020	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	19400000	USD
CY2019	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	173500000	USD
CY2018	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	1120800000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	824700000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	665800000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-373800000	USD
CY2020	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	616100000	USD
CY2019	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	330900000	USD
CY2018	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	378800000	USD
CY2020	us-gaap	Payments To Acquire Machinery And Equipment PaymentsToAcquireMachineryAndEquipment	30200000	USD
CY2019	us-gaap	Payments To Acquire Machinery And Equipment PaymentsToAcquireMachineryAndEquipment	22000000.0	USD
CY2018	us-gaap	Payments To Acquire Machinery And Equipment PaymentsToAcquireMachineryAndEquipment	16400000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	120600000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	54500000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	89400000	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2018	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	49400000	USD
CY2020	us-gaap	Proceeds From Sale Of Notes Receivable ProceedsFromSaleOfNotesReceivable	135500000	USD
CY2019	us-gaap	Proceeds From Sale Of Notes Receivable ProceedsFromSaleOfNotesReceivable	343600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	689100000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	315600000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	128800000	USD
CY2018	us-gaap	Proceeds From Sale Of Notes Receivable ProceedsFromSaleOfNotesReceivable	1476700000	USD
CY2020	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	8500000	USD
CY2019	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	155900000	USD
CY2018	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	345500000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	7900000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	4600000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	6900000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-647800000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-224300000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	119100000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	36500000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	36500000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	152400000	USD
CY2020	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	800000000.0	USD
CY2019	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	300000000.0	USD
CY2018	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	0	USD
CY2020	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	500000000.0	USD
CY2019	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	0	USD
CY2019	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	0	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	2613500000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	2497500000	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1876900000	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	2596800000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	2865100000	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1787500000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	13900000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5000000.0	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	7900000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	9100000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4100000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4300000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	102800000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	112700000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	111000000.0	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	9200000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-6100000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-5400000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-152000000.0	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-360800000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-310700000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1200000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1700000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1500000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	26100000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	82400000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	3100000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	152900000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	70500000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67400000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	179000000.0	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	152900000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	70500000	USD
CY2020	gpk	Noncash Consideration Beneficial Interest Sold In Exchange For Trade Receivables NoncashConsiderationBeneficialInterestSoldInExchangeForTradeReceivables	135200000	USD
CY2019	gpk	Noncash Consideration Beneficial Interest Sold In Exchange For Trade Receivables NoncashConsiderationBeneficialInterestSoldInExchangeForTradeReceivables	-68800000	USD
CY2018	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	1025700000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	70500000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	73100000	USD
CY2020	gpk	Noncash Investing Activities NoncashInvestingActivities	0	USD
CY2019	gpk	Noncash Investing Activities NoncashInvestingActivities	0	USD
CY2018	gpk	Noncash Investing Activities NoncashInvestingActivities	1111200000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	100000	USD
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	44200000	shares
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	15500000	USD
CY2020	gpk	Non Cash Or Part Non Cash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed Financing Activities NonCashOrPartNonCashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumedFinancingActivities	0	USD
CY2019	gpk	Non Cash Or Part Non Cash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed Financing Activities NonCashOrPartNonCashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumedFinancingActivities	0	USD
CY2018	gpk	Non Cash Or Part Non Cash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed Financing Activities NonCashOrPartNonCashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumedFinancingActivities	660000000.0	USD
CY2020Q1	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	15100000	shares
CY2020Q1	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	250000000	USD
CY2020Q3	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	17400000	shares
CY2020Q3	gpk	Stock Repurchased During The Period Shares Units Required To Be Redeemed In Cash StockRepurchasedDuringThePeriodSharesUnitsRequiredToBeRedeemedInCash	3100000	shares
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	44200000	shares
CY2020	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesThe preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of net sales and expenses during the reporting periods. Actual results could differ from these estimates, and changes in these estimates are recorded when known. Estimates are used in accounting for, among other things, pension benefits, retained insurable risks, slow-moving and obsolete inventory, allowance for doubtful accounts, useful lives for depreciation and amortization, impairment testing of goodwill and long-lived assets, fair values related to acquisition accounting, fair value of derivative financial instruments, share based compensation, deferred income tax assets and potential income tax assessments, and loss contingencies.
CY2020Q4	us-gaap	Transfer Of Financial Assets Accounted For As Sales Amount Derecognized TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognized	2849800000	USD
CY2019Q4	us-gaap	Transfer Of Financial Assets Accounted For As Sales Amount Derecognized TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognized	2654200000	USD
CY2020Q4	gpk	Transfer Of Financial Assets Accounted For As Sales Amount Collected By Financial Institution TransferOfFinancialAssetsAccountedForAsSalesAmountCollectedByFinancialInstitution	2787400000	USD
CY2019Q4	gpk	Transfer Of Financial Assets Accounted For As Sales Amount Collected By Financial Institution TransferOfFinancialAssetsAccountedForAsSalesAmountCollectedByFinancialInstitution	2254900000	USD
CY2020Q4	gpk	Transfer Of Financial Assets Accounted For As Sales Amount Funded By Financial Institution TransferOfFinancialAssetsAccountedForAsSalesAmountFundedByFinancialInstitution	54900000	USD
CY2019Q4	gpk	Transfer Of Financial Assets Accounted For As Sales Amount Funded By Financial Institution TransferOfFinancialAssetsAccountedForAsSalesAmountFundedByFinancialInstitution	66500000	USD
CY2020Q4	gpk	Transfer Of Financial Assets Accounted For As Sales Receivable TransferOfFinancialAssetsAccountedForAsSalesReceivable	5300000	USD
CY2019Q4	gpk	Transfer Of Financial Assets Accounted For As Sales Receivable TransferOfFinancialAssetsAccountedForAsSalesReceivable	700000	USD
CY2020Q4	gpk	Transfer Of Financial Assets Accounted For As Sales Pledged Receivable TransferOfFinancialAssetsAccountedForAsSalesPledgedReceivable	201000000.0	USD
CY2019Q4	gpk	Transfer Of Financial Assets Accounted For As Sales Pledged Receivable TransferOfFinancialAssetsAccountedForAsSalesPledgedReceivable	177500000	USD
CY2020	gpk	Transfer Of Financial Assets Accounted For As Sales Amount Sold TransferOfFinancialAssetsAccountedForAsSalesAmountSold	368000000	USD
CY2019	gpk	Transfer Of Financial Assets Accounted For As Sales Amount Sold TransferOfFinancialAssetsAccountedForAsSalesAmountSold	238000000	USD
CY2020Q4	gpk	Factoring Arrangement Amount Transferred Subject To Continuing Involvement FactoringArrangementAmountTransferredSubjectToContinuingInvolvement	621000000	USD
CY2019Q4	gpk	Factoring Arrangement Amount Transferred Subject To Continuing Involvement FactoringArrangementAmountTransferredSubjectToContinuingInvolvement	562000000	USD
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	Concentration of Credit RiskThe Company’s cash, cash equivalents, and accounts receivable are potentially subject to concentration of credit risk. Cash and cash equivalents are placed with financial institutions that management believes are of high credit quality. Accounts receivable are derived from revenue earned from customers located in the U.S. and internationally and generally do not require collateral.
CY2020Q4	gpk	Interest Costs Capitalization Threshold InterestCostsCapitalizationThreshold	1000000.0	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	6900000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2800000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2800000	USD
CY2020	us-gaap	Depreciation Depreciation	413700000	USD
CY2019	us-gaap	Depreciation Depreciation	387900000	USD
CY2018	us-gaap	Depreciation Depreciation	360600000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1106300000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	669400000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	436900000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1085300000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	608000000.0	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	477300000	USD
CY2020	us-gaap	Adjustment For Amortization AdjustmentForAmortization	62100000	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	59300000	USD
CY2018	us-gaap	Adjustment For Amortization AdjustmentForAmortization	70000000.0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	60000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	57000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	55000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	53000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	49000000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	1460600000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	12900000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	4400000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1477900000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-300000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1477600000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	11400000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	10100000	USD
CY2020	gpk	Revenue Recognition Number Of Revenue Generating Activities RevenueRecognitionNumberOfRevenueGeneratingActivities	2	revenue_generating_activity
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	6536500000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	6140800000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	6011900000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	15300000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	24300000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	56100000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	49600000	USD
CY2020	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	10200000	USD
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	9200000	USD
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	8700000	USD
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	-1100000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	4100000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	46800000	USD
CY2020	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	37800000	USD
CY2019	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	23600000	USD
CY2018	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	6700000	USD
CY2020	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	24600000	USD
CY2019	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	10200000	USD
CY2018	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	0	USD
CY2020	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	0	USD
CY2019	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	0	USD
CY2018	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	38600000	USD
CY2020	gpk	Business Combinations And Shutdown And Other Special Charges Net BusinessCombinationsAndShutdownAndOtherSpecialChargesNet	61300000	USD
CY2019	gpk	Business Combinations And Shutdown And Other Special Charges Net BusinessCombinationsAndShutdownAndOtherSpecialChargesNet	37900000	USD
CY2018	gpk	Business Combinations And Shutdown And Other Special Charges Net BusinessCombinationsAndShutdownAndOtherSpecialChargesNet	14900000	USD
CY2020Q3	gpk	Multiemployer Plan Withdrawal Obligation Increase Decrease Amount MultiemployerPlanWithdrawalObligationIncreaseDecreaseAmount	12200000	USD
CY2020Q4	us-gaap	Multiemployer Plan Pension Insignificant Plan Contribution MultiemployerPlanPensionInsignificantPlanContribution	3900000	USD
CY2020Q2	gpk	Number Of Converting Facilities NumberOfConvertingFacilities	7	Facilities
CY2019Q3	gpk	Business Combination Number Of Facilities Acquired BusinessCombinationNumberOfFacilitiesAcquired	2	facility
CY2019Q3	gpk	Business Acquisition Number Of Mills Acquired BusinessAcquisitionNumberOfMillsAcquired	1	mill
CY2017Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	250000000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	315600000	USD
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	23420010	shares
CY2020Q4	us-gaap	Share Price SharePrice	13.48
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	127900000	USD
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	10191257	shares
CY2019Q4	us-gaap	Share Price SharePrice	12.55
CY2018	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	120000000.0	USD
CY2018	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	10566144	shares
CY2018Q4	us-gaap	Share Price SharePrice	11.35
CY2020Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	146500000	USD
CY2020	gpk	Dividends Paid To External Parties DividendsPaidToExternalParties	84700000	USD
CY2019	gpk	Dividends Paid To External Parties DividendsPaidToExternalParties	88700000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	608500000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	462700000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	11900000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	11500000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	596600000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	451200000	USD
CY2020Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	57800000	USD
CY2019Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	53300000	USD
CY2020Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	654400000	USD
CY2019Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	504500000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	3808800000	USD
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	471300000	USD
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	434800000	USD
CY2020Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	132500000	USD
CY2019Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	123400000	USD
CY2020Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	348500000	USD
CY2019Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	370000000.0	USD
CY2020Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	175300000	USD
CY2019Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	167700000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	1127600000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	1095900000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	7368800000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	6821100000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	3567300000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	3560000000.0	USD
CY2019Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	21800000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	3253800000	USD
CY2020Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	20100000	USD
CY2020Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	21100000	USD
CY2019Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	15200000	USD
CY2020Q4	us-gaap	Customer Refund Liability Current CustomerRefundLiabilityCurrent	40500000	USD
CY2019Q4	us-gaap	Customer Refund Liability Current CustomerRefundLiabilityCurrent	36500000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	8500000	USD
CY2019Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	8500000	USD
CY2020Q4	gpk	Accrued Income And Other Taxes Current AccruedIncomeAndOtherTaxesCurrent	56500000	USD
CY2019Q4	gpk	Accrued Income And Other Taxes Current AccruedIncomeAndOtherTaxesCurrent	38400000	USD
CY2020Q4	gpk	Other Accrued Payables OtherAccruedPayables	37600000	USD
CY2019Q4	gpk	Other Accrued Payables OtherAccruedPayables	31400000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	60500000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	54800000	USD
CY2020Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	46200000	USD
CY2019Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	32500000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	291000000.0	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	239100000	USD
CY2020Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	6500000	USD
CY2019Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	5300000	USD
CY2020Q4	gpk	Multiemployer Plans Withdrawal Obligation Noncurrent MultiemployerPlansWithdrawalObligationNoncurrent	20000000.0	USD
CY2019Q4	gpk	Multiemployer Plans Withdrawal Obligation Noncurrent MultiemployerPlansWithdrawalObligationNoncurrent	30800000	USD
CY2020Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	8700000	USD
CY2019Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	9500000	USD
CY2020Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	400000	USD
CY2019Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	3000000.0	USD
CY2020Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	26600000	USD
CY2019Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	28900000	USD
CY2020Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	16500000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	12100000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	157200000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	151500000	USD
CY2020Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	55400000	USD
CY2019Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	25700000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	291300000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	266800000	USD
CY2020	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	215700000	USD
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	107600000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	1158100000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-34800000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	72800000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	82000000.0	USD
CY2020	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	5300000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	9500000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-300000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	21500000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	7900000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	1000000.0	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	70900000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-8600000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	76200000	USD
CY2020	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	40300000	USD
CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	12900000	USD
CY2018	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	26900000	USD
CY2020	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	6900000	USD
CY2019	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-4200000	USD
CY2018	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	600000	USD
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	5600000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	8400000	USD
CY2018	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-4100000	USD
CY2020	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	30900000	USD
CY2019	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	5200000	USD
CY2018	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	11800000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	33700000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	10600000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	8600000	USD
CY2020	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	19400000	USD
CY2019	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	173500000	USD
CY2018	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	1120800000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	119500000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	126800000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	125000000.0	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	27200000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	25800000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	25800000	USD
CY2019Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangible Assets Other Than Goodwill BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill	6500000	USD
CY2019Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	38500000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	7500000	USD
CY2020	us-gaap	Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	31200000	USD
CY2020	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	2000000.0	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	3300000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	5000000.0	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	9300000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4600000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	488900000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	36500000	USD
CY2020Q4	us-gaap	Debt Current DebtCurrent	497200000	USD
CY2019Q4	us-gaap	Debt Current DebtCurrent	50400000	USD
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.049
CY2019Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.021
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	139400000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	134200000	USD
CY2020Q4	gpk	Long Term Debt Gross And Finance Lease Liability Including Current Maturities LongTermDebtGrossAndFinanceLeaseLiabilityIncludingCurrentMaturities	3663300000	USD
CY2019Q4	gpk	Long Term Debt Gross And Finance Lease Liability Including Current Maturities LongTermDebtGrossAndFinanceLeaseLiabilityIncludingCurrentMaturities	2863500000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	493900000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	41100000	USD
CY2020Q4	gpk	Long Term Debt Gross And Finance Lease Liability LongTermDebtGrossAndFinanceLeaseLiability	3169400000	USD
CY2019Q4	gpk	Long Term Debt Gross And Finance Lease Liability LongTermDebtGrossAndFinanceLeaseLiability	2822400000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	22400000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	12500000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	3147000000.0	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	2809900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	488900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	378400000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1252900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	300500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1103200000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	3523900000	USD
CY2018Q1	gpk	Lineof Credit Facility Increase Decreasein Maximum Borrowing Capacity LineofCreditFacilityIncreaseDecreaseinMaximumBorrowingCapacity	200000000	USD
CY2018Q1	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	1450000000	USD
CY2018Q1	us-gaap	Repayments Of Medium Term Notes RepaymentsOfMediumTermNotes	125000000	USD
CY2018Q1	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	800000000	USD
CY2013Q3	gpk	Lineof Credit Facility Increase Decreasein Maximum Borrowing Capacity LineofCreditFacilityIncreaseDecreaseinMaximumBorrowingCapacity	138000000	EUR
CY2013Q3	gpk	Lineof Credit Facility Increase Decreasein Maximum Borrowing Capacity LineofCreditFacilityIncreaseDecreaseinMaximumBorrowingCapacity	2500000000	JPY
CY2018Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	660000000	USD
CY2018Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	660000000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	1700500000	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	92700000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	1587100000	USD
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	20700000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	7900000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	7600000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	7900000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	7800000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	72100000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	64800000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	12600000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	12900000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	10300000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	4400000	USD
CY2020	us-gaap	Lease Cost LeaseCost	110800000	USD
CY2019	us-gaap	Lease Cost LeaseCost	97500000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	71900000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	64700000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	7900000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	7800000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4600000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4200000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	70500000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	73100000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	100000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	15500000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	208300000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	202800000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	60500000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	54800000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	157200000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	151500000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	217700000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	206300000	USD
CY2020Q4	gpk	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	142300000	USD
CY2019Q4	gpk	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	142100000	USD
CY2020Q4	gpk	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	20100000	USD
CY2019Q4	gpk	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	12200000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	122200000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	129900000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	5000000.0	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4600000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	134400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	129600000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	139400000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	134200000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P16Y
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P17Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0324
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0357
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0560
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0560
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	64100000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	12600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	53000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	12200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	39000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	12400000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	25600000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	12400000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	18000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	12500000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	34300000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	145700000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	234000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	207800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	16300000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	78200000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	217700000	USD
CY2020Q4	gpk	Finance Lease Liability Less Portion Not Yet Reclassified FinanceLeaseLiabilityLessPortionNotYetReclassified	129600000	USD
CY2020Q4	gpk	Share Based Compensation Arrangement By Share Based Payment Award Number Of Plans ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans	1	compensation_plan
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	33800000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	21700000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13800000	USD
CY2020Q4	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	150200000	USD
CY2020Q4	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	39200000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Settlements Plan Assets DefinedBenefitPlanSettlementsPlanAssets	713000000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	153700000	USD
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-61900000	USD
CY2020	gpk	Defined Benefit Plan Benefit Obligation Actuarial Gain Loss Portion Attributable To Change In Discount Rate DefinedBenefitPlanBenefitObligationActuarialGainLossPortionAttributableToChangeInDiscountRate	51200000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1.000
CY2020Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2019Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2020	us-gaap	Multiemployer Plan Pension Insignificant Plan Contribution MultiemployerPlanPensionInsignificantPlanContribution	100000	USD
CY2019	us-gaap	Multiemployer Plan Pension Insignificant Plan Contribution MultiemployerPlanPensionInsignificantPlanContribution	600000	USD
CY2020Q2	gpk	Multiemployer Plan Withdrawal Obligation Increase Decrease Amount MultiemployerPlanWithdrawalObligationIncreaseDecreaseAmount	12200000	USD
CY2020Q4	us-gaap	Multiemployer Plan Pension Insignificant Plan Contribution MultiemployerPlanPensionInsignificantPlanContribution	3900000	USD
CY2020Q4	us-gaap	Multiemployer Plans Withdrawal Obligation MultiemployerPlansWithdrawalObligation	37200000	USD
CY2019Q4	us-gaap	Multiemployer Plans Withdrawal Obligation MultiemployerPlansWithdrawalObligation	30800000	USD
CY2020	gpk	Number Of Multiemployer Plans NumberOfMultiemployerPlans	1	plan
CY2020	us-gaap	Multiemployer Plan Employer Contribution Cost MultiemployerPlanEmployerContributionCost	100000	USD
CY2019	us-gaap	Multiemployer Plan Employer Contribution Cost MultiemployerPlanEmployerContributionCost	200000	USD
CY2018	us-gaap	Multiemployer Plan Employer Contribution Cost MultiemployerPlanEmployerContributionCost	500000	USD
CY2020	us-gaap	Multiemployer Plan Pension Insignificant Employer Contribution Under Collective Bargaining Arrangement To All Participating Employer Contributions Percentage MultiemployerPlanPensionInsignificantEmployerContributionUnderCollectiveBargainingArrangementToAllParticipatingEmployerContributionsPercentage	0.05
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	62000000.0	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	57600000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	54600000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	180500000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	305400000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	298900000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	23600000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	63500000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	48600000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	48600000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	244000000.0	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	354000000.0	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	347500000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	23000000.0	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	10100000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	13000000.0	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	19300000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	13500000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	15700000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	42300000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	28700000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	8500000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	47700000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	31600000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-9200000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	5000000.0	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-5600000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-700000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	52700000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	26000000.0	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	41600000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	76300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	54700000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	51200000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	74300000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	73000000.0	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7700000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.032
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12300000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.035
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	11700000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.034
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	1000000.0	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.004
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	2800000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.008
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	3800000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.011
CY2020	gpk	Tax Benefit Expense Related To The Tax Cuts And Jobs Act TaxBenefitExpenseRelatedToTheTaxCutsAndJobsAct	0	USD
CY2020	gpk	Tax Benefit Expense Related To The Tax Cuts And Jobs Act Percent TaxBenefitExpenseRelatedToTheTaxCutsAndJobsActPercent	0
CY2019	gpk	Tax Benefit Expense Related To The Tax Cuts And Jobs Act TaxBenefitExpenseRelatedToTheTaxCutsAndJobsAct	0	USD
CY2019	gpk	Tax Benefit Expense Related To The Tax Cuts And Jobs Act Percent TaxBenefitExpenseRelatedToTheTaxCutsAndJobsActPercent	0
CY2018	gpk	Tax Benefit Expense Related To The Tax Cuts And Jobs Act TaxBenefitExpenseRelatedToTheTaxCutsAndJobsAct	-10900000	USD
CY2018	gpk	Tax Benefit Expense Related To The Tax Cuts And Jobs Act Percent TaxBenefitExpenseRelatedToTheTaxCutsAndJobsActPercent	-0.031
CY2020	gpk	Effective Income Tax Rate Reconciliation Provision To Income Tax Return Adjustments Amount EffectiveIncomeTaxRateReconciliationProvisionToIncomeTaxReturnAdjustmentsAmount	2200000	USD
CY2020	gpk	Effective Income Tax Rate Reconciliation Provision To Income Tax Return Adjustments Percent EffectiveIncomeTaxRateReconciliationProvisionToIncomeTaxReturnAdjustmentsPercent	-0.009
CY2019	gpk	Effective Income Tax Rate Reconciliation Provision To Income Tax Return Adjustments Amount EffectiveIncomeTaxRateReconciliationProvisionToIncomeTaxReturnAdjustmentsAmount	0	USD
CY2019	gpk	Effective Income Tax Rate Reconciliation Provision To Income Tax Return Adjustments Percent EffectiveIncomeTaxRateReconciliationProvisionToIncomeTaxReturnAdjustmentsPercent	0
CY2018	gpk	Effective Income Tax Rate Reconciliation Provision To Income Tax Return Adjustments Amount EffectiveIncomeTaxRateReconciliationProvisionToIncomeTaxReturnAdjustmentsAmount	0	USD
CY2018	gpk	Effective Income Tax Rate Reconciliation Provision To Income Tax Return Adjustments Percent EffectiveIncomeTaxRateReconciliationProvisionToIncomeTaxReturnAdjustmentsPercent	0
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-7000000.0	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.029
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	4600000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.013
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-13000000.0	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.037
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	3000000.0	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.012
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	1600000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.005
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	1900000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.005
CY2020	gpk	Income Tax Reconciliation Foreign Withholding Tax IncomeTaxReconciliationForeignWithholdingTax	800000	USD
CY2020	gpk	Effective Income Tax Rate Reconciliation Foreign Withholding Tax EffectiveIncomeTaxRateReconciliationForeignWithholdingTax	0.003
CY2019	gpk	Income Tax Reconciliation Foreign Withholding Tax IncomeTaxReconciliationForeignWithholdingTax	700000	USD
CY2019	gpk	Effective Income Tax Rate Reconciliation Foreign Withholding Tax EffectiveIncomeTaxRateReconciliationForeignWithholdingTax	0.002
CY2018	gpk	Income Tax Reconciliation Foreign Withholding Tax IncomeTaxReconciliationForeignWithholdingTax	500000	USD
CY2018	gpk	Effective Income Tax Rate Reconciliation Foreign Withholding Tax EffectiveIncomeTaxRateReconciliationForeignWithholdingTax	0.001
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	400000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.001
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	1000000.0	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.003
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-1900000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.005
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	9700000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.040
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	9500000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.027
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	300000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.001
CY2020	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	2300000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.010
CY2019	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	1900000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.005
CY2018	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	700000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.002
CY2020	gpk	Effective Income Tax Reconciliation Capital Loss Expiration Amount EffectiveIncomeTaxReconciliationCapitalLossExpirationAmount	0	USD
CY2020	gpk	Effective Income Tax Rate Reconciliation Capital Loss Expiration Percent EffectiveIncomeTaxRateReconciliationCapitalLossExpirationPercent	0
CY2019	gpk	Effective Income Tax Reconciliation Capital Loss Expiration Amount EffectiveIncomeTaxReconciliationCapitalLossExpirationAmount	0	USD
CY2019	gpk	Effective Income Tax Rate Reconciliation Capital Loss Expiration Percent EffectiveIncomeTaxRateReconciliationCapitalLossExpirationPercent	0
CY2018	gpk	Effective Income Tax Reconciliation Capital Loss Expiration Amount EffectiveIncomeTaxReconciliationCapitalLossExpirationAmount	-2700000	USD
CY2018	gpk	Effective Income Tax Rate Reconciliation Capital Loss Expiration Percent EffectiveIncomeTaxRateReconciliationCapitalLossExpirationPercent	-0.007
CY2020	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	5500000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.022
CY2019	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	13700000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.039
CY2018	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	13700000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.039
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-400000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.002
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	300000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.001
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	200000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	41600000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.170
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	76300000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.216
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	54700000	USD
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.157
CY2020	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-2200000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit	-10900000	USD
CY2018	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	13000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3800000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	40300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	45500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	1400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	19300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	37200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	8400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	10900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	34400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	41100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	38600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	57200000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	20800000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	18800000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	2900000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	2700000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	11200000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	12300000	USD
CY2020Q4	gpk	Deferred Tax Liabilities Investment In Partnership DeferredTaxLiabilitiesInvestmentInPartnership	530400000	USD
CY2019Q4	gpk	Deferred Tax Liabilities Investment In Partnership DeferredTaxLiabilitiesInvestmentInPartnership	532200000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	565300000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	566000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	526700000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	508800000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	73000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	98300000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	565300000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	566000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	34400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	41100000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	41100000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	36300000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	51500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	34400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	41100000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	36300000	USD
CY2020Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	19300000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20700000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	15500000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10500000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1200000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	800000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2400000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5200000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	3700000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	400000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1000000.0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	19600000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20700000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	15500000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	19600000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation	100000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	100000	USD
CY2020Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	100000	USD
CY2020Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Foreign Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries	0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	51400000	USD
CY2020Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	55000000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-2700000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	2300000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-1600000	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	3624700000	USD
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	2788600000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	3523900000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	2729300000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	8800000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	7300000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-12300000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	1700000	USD
CY2020	us-gaap	Derivative Instruments Gain Loss Reclassification From Accumulated Oci To Income Estimated Net Amount To Be Transferred DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred	5900000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	524300000	USD
CY2020Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-13100000	USD
CY2019Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-16600000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	138600000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	238500000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-94200000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-110700000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-245900000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-365800000	USD
CY2020	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	691800000	USD
CY2020Q1	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	15100000	shares
CY2020Q1	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	250000000	USD
CY2020Q3	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	17400000	shares
CY2020Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	250000000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2020Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	8	paperboard_mill
CY2020	us-gaap	Revenues Revenues	6559900000	USD
CY2019	us-gaap	Revenues Revenues	6160100000	USD
CY2018	us-gaap	Revenues Revenues	6029400000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	458200000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	534100000	USD
CY2020	us-gaap	Payments To Acquire Assets Investing Activities PaymentsToAcquireAssetsInvestingActivities	646300000	USD
CY2019	us-gaap	Payments To Acquire Assets Investing Activities PaymentsToAcquireAssetsInvestingActivities	352900000	USD
CY2018	us-gaap	Payments To Acquire Assets Investing Activities PaymentsToAcquireAssetsInvestingActivities	395200000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	475800000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	447200000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	430600000	USD
CY2020Q4	us-gaap	Assets Assets	7804600000	USD
CY2019Q4	us-gaap	Assets Assets	7289900000	USD
CY2018Q4	us-gaap	Assets Assets	7059200000	USD
CY2020	us-gaap	Revenues Revenues	6559900000	USD
CY2019	us-gaap	Revenues Revenues	6160100000	USD
CY2018	us-gaap	Revenues Revenues	6029400000	USD
CY2020Q4	us-gaap	Noncurrent Assets NoncurrentAssets	3560000000.0	USD
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	3253800000	USD
CY2018Q4	us-gaap	Noncurrent Assets NoncurrentAssets	3239700000	USD
CY2020Q1	us-gaap	Revenues Revenues	1599100000	USD
CY2020Q2	us-gaap	Revenues Revenues	1611000000.0	USD
CY2020Q3	us-gaap	Revenues Revenues	1697700000	USD
CY2020Q4	us-gaap	Revenues Revenues	1652100000	USD
CY2020	us-gaap	Revenues Revenues	6559900000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	320800000	USD
CY2020Q2	us-gaap	Gross Profit GrossProfit	262100000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	255500000	USD
CY2020Q4	us-gaap	Gross Profit GrossProfit	261800000	USD
CY2020	us-gaap	Gross Profit GrossProfit	1100200000	USD
CY2020Q1	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	18700000	USD
CY2020Q2	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	20500000	USD
CY2020Q3	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	9000000.0	USD
CY2020Q4	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	13100000	USD
CY2020	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	61300000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	160000000.0	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	114800000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	119100000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	130400000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	524300000	USD
CY2020Q1	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	-19800000	USD
CY2020Q2	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	66700000	USD
CY2020Q3	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	79300000	USD
CY2020Q4	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	77100000	USD
CY2020	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	203300000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-12700000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	52100000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	63700000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	64200000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	167300000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.04
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.24
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.04
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2019Q1	us-gaap	Revenues Revenues	1505900000	USD
CY2019Q2	us-gaap	Revenues Revenues	1552800000	USD
CY2019Q3	us-gaap	Revenues Revenues	1581600000	USD
CY2019Q4	us-gaap	Revenues Revenues	1519800000	USD
CY2019	us-gaap	Revenues Revenues	6160100000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	266100000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	287800000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	266400000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	272300000	USD
CY2019	us-gaap	Gross Profit GrossProfit	1092600000	USD
CY2019Q1	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	6200000	USD
CY2019Q2	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	9900000	USD
CY2019Q3	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	8200000	USD
CY2019Q4	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	13600000	USD
CY2019	gpk	Goodwill Impairment Restructuring And Other Special Charges GoodwillImpairmentRestructuringAndOtherSpecialCharges	37900000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	134000000.0	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	144400000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	122700000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	133000000.0	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	534100000	USD
CY2019Q1	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	78100000	USD
CY2019Q2	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	86100000	USD
CY2019Q3	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	70000000.0	USD
CY2019Q4	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	43900000	USD
CY2019	gpk	Net Income Loss Including Portion Attributable To Redeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToRedeemableNoncontrollingInterest	278100000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	57900000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	63800000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	52100000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	33000000.0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	206800000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.18
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.70
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.18
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.70
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2020	us-gaap	Net Income Loss NetIncomeLoss	167300000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	206800000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	221100000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	278800000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	294100000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	309500000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	800000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	700000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	600000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	279600000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	294800000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	310100000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.71
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	24800000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-135800000	USD
CY2020	gpk	Other Comprehensive Income Loss Net Of Tax Including Redeemable Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxIncludingRedeemableNoncontrollingInterest	160600000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	50600000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	14900000	USD
CY2018Q4	us-gaap	Restructuring Reserve RestructuringReserve	0	USD
CY2019	us-gaap	Restructuring Reserve Period Increase Decrease RestructuringReservePeriodIncreaseDecrease	7700000	USD
CY2019	us-gaap	Payments For Restructuring PaymentsForRestructuring	600000	USD
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	7100000	USD
CY2020	us-gaap	Restructuring Reserve Period Increase Decrease RestructuringReservePeriodIncreaseDecrease	11200000	USD
CY2020	us-gaap	Payments For Restructuring PaymentsForRestructuring	5900000	USD
CY2020	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	-800000	USD
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	11600000	USD

Files In Submission

Name	View Source	Status
0001408075-21-000012-index-headers.html	Edgar Link	pending
0001408075-21-000012-index.html	Edgar Link	pending
0001408075-21-000012.txt	Edgar Link	pending
0001408075-21-000012-xbrl.zip	Edgar Link	pending
a202010kexhibit109.htm	Edgar Link	pending
exhibit211-2020x10xk.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
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gpk-20201231_cal.xml	Edgar Link	unprocessable
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gpk-20201231_htm.xml	Edgar Link	completed
gpk-20201231_lab.xml	Edgar Link	unprocessable
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2020 Q4 Form 10-K Financial Statement

#000140807521000012 Filed on February 16, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPK GRAPHIC PACKAGING HOLDING CO Stock $gpk

2020 Q4 Form 10-K Financial Statement

#000140807521000012 Filed on February 16, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPK
GRAPHIC PACKAGING HOLDING CO Stock $gpk