$GPI
Group 1 Automotive Inc Stock $gpi

$gpi Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000103120321000007 Filed on February 24, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2018 Q4
Revenue	$2.922B	$3.111B	$2.909B
YoY Change	-6.09%	6.97%	-0.4%
Cost Of Revenue	$2.509B	$2.647B	$2.477B
YoY Change	-5.23%	6.87%	-0.72%
Gross Profit	$471.1M	$464.6M	$432.1M
YoY Change	1.4%	7.52%	1.51%
Gross Profit Margin	16.12%	14.93%	14.85%
Selling, General & Admin	$298.4M	$338.0M	$323.8M
YoY Change	-11.72%	4.39%	4.62%
% of Gross Profit	63.34%	72.75%	74.94%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$19.30M	$18.60M	$17.10M
YoY Change	3.76%	8.77%	13.25%
% of Gross Profit	4.1%	4.0%	3.96%
Operating Expenses	$317.6M	$356.7M	$341.0M
YoY Change	-10.96%	4.6%	5.02%
Operating Profit	$153.5M	$96.50M	$74.70M
YoY Change	59.07%	29.18%	-26.02%
Interest Expense	-$22.00M	-$33.70M	-$35.00M
YoY Change	-34.72%	-3.71%	9.38%
% of Operating Profit	-14.33%	-34.92%	-46.85%
Other Income/Expense, Net	-$100.0K	$100.0K
YoY Change	-200.0%
Pretax Income	$128.1M	$62.90M	$39.70M
YoY Change	103.66%	58.44%	-32.71%
Income Tax	$28.00M	$14.80M	$8.800M
% Of Pretax Income	21.86%	23.53%	22.17%
Net Earnings	$100.1M	$48.10M	$30.70M
YoY Change	108.11%	56.68%	-72.21%
Net Earnings / Revenue	3.43%	1.55%	1.06%
Basic Earnings Per Share	$5.45	$2.57	$1.62
Diluted Earnings Per Share	$5.43	$2.57	$1.62
COMMON SHARES
Basic Shares Outstanding	18.31M shares	18.62M shares	19.17M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2020 Q4	2019 Q4	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$87.30M	$23.80M	$15.90M
YoY Change	266.81%	49.69%	-44.79%
Cash & Equivalents	$69.00M	$23.80M	$15.90M
Short-Term Investments
Other Short-Term Assets	$16.10M	$15.50M	$26.40M
YoY Change	3.87%	-41.29%	-37.29%
Inventory	$1.446B	$1.902B	$1.844B
Prepaid Expenses	$15.30M	$96.40M	$56.30M
Receivables	$200.0M	$225.1M	$194.0M
Other Receivables	$211.2M	$253.8M	$265.6M
Total Short-Term Assets	$2.004B	$2.516B	$2.402B
YoY Change	-20.35%	4.74%	3.14%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.608B	$1.547B	$1.348B
YoY Change	3.95%	14.79%	2.19%
Goodwill	$997.1M	$994.5M	$963.9M
YoY Change	0.26%	3.17%	5.58%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$28.70M	$24.80M	$27.30M
YoY Change	15.73%	-9.16%	12.56%
Total Long-Term Assets	$3.085B	$3.054B	$2.599B
YoY Change	1.02%	17.52%	2.24%
TOTAL ASSETS
Total Short-Term Assets	$2.004B	$2.516B	$2.402B
Total Long-Term Assets	$3.085B	$3.054B	$2.599B
Total Assets	$5.089B	$5.570B	$5.001B
YoY Change	-8.63%	11.38%	2.67%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$430.4M	$527.5M	$419.4M
YoY Change	-18.41%	25.77%	1.55%
Accrued Expenses	$217.9M	$206.7M	$197.6M
YoY Change	5.42%	4.61%	11.59%
Deferred Revenue
YoY Change
Short-Term Debt	$1.095B	$1.657B	$1.685B
YoY Change	-33.9%	-1.67%	7.53%
Long-Term Debt Due	$56.70M	$6.600M	$84.70M
YoY Change	759.09%	-92.21%	114.43%
Total Short-Term Liabilities	$1.843B	$2.422B	$2.387B
YoY Change	-23.93%	1.5%	8.56%
LONG-TERM LIABILITIES
Long-Term Debt	$1.295B	$1.432B	$1.282B
YoY Change	-9.59%	11.75%	-2.78%
Other Long-Term Liabilities	$153.8M	$99.20M	$102.6M
YoY Change	55.04%	-3.31%	5.64%
Total Long-Term Liabilities	$153.8M	$99.20M	$102.6M
YoY Change	55.04%	-3.31%	5.64%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.843B	$2.422B	$2.387B
Total Long-Term Liabilities	$153.8M	$99.20M	$102.6M
Total Liabilities	$1.997B	$2.522B	$2.489B
YoY Change	-20.82%	1.3%	8.43%
SHAREHOLDERS EQUITY
Retained Earnings	$1.818B	$1.542B	$1.395B
YoY Change	17.86%	10.58%	11.91%
Common Stock	$308.6M	$295.6M	$293.1M
YoY Change	4.4%	0.85%	0.47%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$492.8M	$435.3M	$454.4M
YoY Change	13.21%	-4.2%	56.4%
Treasury Stock Shares	7.343M shares	6.859M shares	7.172M shares
Shareholders Equity	$1.450B	$1.256B	$1.096B
YoY Change
Total Liabilities & Shareholders Equity	$5.089B	$5.570B	$5.001B
YoY Change	-8.63%	11.38%	2.67%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2018 Q4
OPERATING ACTIVITIES
Net Income	$100.1M	$48.10M	$30.70M
YoY Change	108.11%	56.68%	-72.21%
Depreciation, Depletion And Amortization	$19.30M	$18.60M	$17.10M
YoY Change	3.76%	8.77%	13.25%
Cash From Operating Activities	$92.70M	$60.00M	-$87.40M
YoY Change	54.5%	-168.65%	-21.05%
INVESTING ACTIVITIES
Capital Expenditures	-$24.40M	-$52.30M	-$22.80M
YoY Change	-53.35%	129.39%	-68.11%
Acquisitions
YoY Change
Other Investing Activities	$28.50M	-$45.80M	$300.0K
YoY Change	-162.23%	-15366.67%	-94.64%
Cash From Investing Activities	$4.100M	-$98.10M	-$22.50M
YoY Change	-104.18%	336.0%	-65.86%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-77.70M	23.10M	94.70M
YoY Change	-436.36%	-75.61%	-32.16%
NET CHANGE
Cash From Operating Activities	92.70M	60.00M	-87.40M
Cash From Investing Activities	4.100M	-98.10M	-22.50M
Cash From Financing Activities	-77.70M	23.10M	94.70M
Net Change In Cash	19.10M	-15.00M	-15.20M
YoY Change	-227.33%	-1.32%	-58.92%
FREE CASH FLOW
Cash From Operating Activities	$92.70M	$60.00M	-$87.40M
Capital Expenditures	-$24.40M	-$52.30M	-$22.80M
Free Cash Flow	$117.1M	$112.3M	-$64.60M
YoY Change	4.27%	-273.84%	64.8%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001031203
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	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	1-13461
CY2020	dei	Entity Registrant Name EntityRegistrantName	Group 1 Automotive, Inc
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	76-0506313
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020Q2	dei	Entity Public Float EntityPublicFloat	1100000000	USD
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	800 Gessner,
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 500
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	77024
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Houston,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2020	dei	City Area Code CityAreaCode	713
CY2020	dei	Local Phone Number LocalPhoneNumber	647-5700
CY2020	dei	Security12b Title Security12bTitle	Common stock, par value $0.01 per share
CY2020	dei	Trading Symbol TradingSymbol	GPI
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
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CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.83
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17800000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17900000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19500000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17900000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19500000	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	286500000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-8700000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	3900000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-24200000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-11400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-4100000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-2100000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-36700000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-13300000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	6500000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-28400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-13000000.0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	9800000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-37100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-9200000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-14400000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	249400000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	164800000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	143400000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1124300000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-14400000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	0	USD
CY2018	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-183900000	USD
CY2018	gpi	Stock Issued During Period Value Employee Stock Purchase Plan Net StockIssuedDuringPeriodValueEmployeeStockPurchasePlanNet	2700000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	18700000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.04
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	20800000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1095700000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9200000	USD
CY2019	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-1400000	USD
CY2019	gpi	Stock Issued During Period Value Employee Stock Purchase Plan Net StockIssuedDuringPeriodValueEmployeeStockPurchasePlanNet	4200000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	18800000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.09
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	20300000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1255700000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	286500000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-37100000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	286500000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2020	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-80200000	USD
CY2020	gpi	Stock Issued During Period Value Employee Stock Purchase Plan Net StockIssuedDuringPeriodValueEmployeeStockPurchasePlanNet	3300000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	32300000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.60
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	11000000.0	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1449600000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	75800000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	71600000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	67100000	USD
CY2020	gpi	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	24000000.0	USD
CY2019	gpi	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	28200000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-900000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	16200000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3500000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	37700000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	22200000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	43900000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	32300000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	18800000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	18700000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3200000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	4000000.0	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3400000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	5800000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	5900000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	26800000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-13700000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2200000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1100000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-900000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-45900000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	123100000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	18400000	USD
CY2020	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-21200000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	32500000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-2900000	USD
CY2020	us-gaap	Increase Decrease In Retail Related Inventories IncreaseDecreaseInRetailRelatedInventories	-416100000	USD
CY2019	us-gaap	Increase Decrease In Retail Related Inventories IncreaseDecreaseInRetailRelatedInventories	28800000	USD
CY2018	us-gaap	Increase Decrease In Retail Related Inventories IncreaseDecreaseInRetailRelatedInventories	80600000	USD
CY2020	gpi	Increase Decrease In Contracts In Transit And Vehicle Receivables IncreaseDecreaseInContractsInTransitAndVehicleReceivables	-43500000	USD
CY2019	gpi	Increase Decrease In Contracts In Transit And Vehicle Receivables IncreaseDecreaseInContractsInTransitAndVehicleReceivables	-12700000	USD
CY2018	gpi	Increase Decrease In Contracts In Transit And Vehicle Receivables IncreaseDecreaseInContractsInTransitAndVehicleReceivables	-39500000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-56900000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	44000000.0	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	16300000	USD
CY2020	gpi	Increase Decrease Floor Plan Notes IncreaseDecreaseFloorPlanNotes	132200000	USD
CY2019	gpi	Increase Decrease Floor Plan Notes IncreaseDecreaseFloorPlanNotes	-38900000	USD
CY2018	gpi	Increase Decrease Floor Plan Notes IncreaseDecreaseFloorPlanNotes	-38400000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-500000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-500000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-800000	USD
CY2020	gpi	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	22300000	USD
CY2019	gpi	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	28300000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	805400000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	370900000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	270000000.0	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1300000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	143200000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	135300000	USD
CY2020	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	29800000	USD
CY2019	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	43400000	USD
CY2018	gpi	Proceeds From Disposition Of Franchise Property And Equipment ProceedsFromDispositionOfFranchisePropertyAndEquipment	107900000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	103200000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	191800000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	141000000.0	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-500000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-74700000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-291600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-168000000.0	USD
CY2020	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	9998100000	USD
CY2019	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	7304600000	USD
CY2018	gpi	Borrowings On Credit Facility Floorplan Line BorrowingsOnCreditFacilityFloorplanLine	6954300000	USD
CY2020	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	10374000000.0	USD
CY2019	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	7423200000	USD
CY2018	gpi	Repayments On Credit Facility Floorplan Line RepaymentsOnCreditFacilityFloorplanLine	6870100000	USD
CY2020	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	284000000.0	USD
CY2018	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	158500000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	319000000.0	USD
CY2018	gpi	Borrowings On Credit Facility Acquisition Line BorrowingsOnCreditFacilityAcquisitionLine	165300000	USD
CY2020	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	309500000	USD
CY2019	gpi	Repayments On Credit Facility Acquisition Line RepaymentsOnCreditFacilityAcquisitionLine	281400000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	9000000.0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5400000	USD
CY2020	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	550000000.0	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2020	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	857900000	USD
CY2019	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2018	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	271900000	USD
CY2019	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	350900000	USD
CY2018	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	210700000	USD
CY2020	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	134000000.0	USD
CY2019	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	314000000.0	USD
CY2018	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	210300000	USD
CY2020	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	9600000	USD
CY2019	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	8600000	USD
CY2018	gpi	Net Issuanceof Commonand Treasury Sharesto Employee Stock Compensation Plans NetIssuanceofCommonandTreasurySharestoEmployeeStockCompensationPlans	7600000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6200000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4400000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4900000	USD
CY2020	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	0	USD
CY2020Q1	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	0	USD
CY2019Q1	gpi	Proceeds From Termination Of Mortgage Swap ProceedsFromTerminationOfMortgageSwap	900000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	80200000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1400000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	183900000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	11000000.0	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20300000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20900000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-668100000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-67000000.0	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-109500000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-3400000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2900000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-3300000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	59200000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	9300000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-10900000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	28100000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18700000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	29600000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	87300000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	28100000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	18700000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesThe preparation of the Company’s financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the balance sheet date and the amounts of revenues and expenses recognized during the reporting period. Management analyzes the Company’s estimates based on historical experience and other assumptions that are believed to be reasonable under the circumstances, however, actual results could differ materially from such estimates. The significant estimates made by management in the accompanying Consolidated Financial Statements include, but are not limited to, inventory valuation adjustments, reserves for future chargebacks on finance, insurance and vehicle service contract fees, self-insured property and casualty insurance exposure, the fair value of assets acquired and liabilities assumed in business combinations, the valuation of goodwill and intangible franchise rights, and reserves for potential litigation. Additionally, while the full impact of the COVID-19 pandemic is unknown and cannot be reasonably estimated, the Company has made accounting estimates based on the facts and circumstances available as of the reporting date
CY2020	us-gaap	Loss From Catastrophes LossFromCatastrophes	900000	USD
CY2019	us-gaap	Loss From Catastrophes LossFromCatastrophes	16100000	USD
CY2018	us-gaap	Loss From Catastrophes LossFromCatastrophes	6100000	USD
CY2020	gpi	Assetimpairmentchargesofpropertyandequipment Assetimpairmentchargesofpropertyandequipment	4200000	USD
CY2019	gpi	Assetimpairmentchargesofpropertyandequipment Assetimpairmentchargesofpropertyandequipment	1800000	USD
CY2018	gpi	Assetimpairmentchargesofpropertyandequipment Assetimpairmentchargesofpropertyandequipment	5100000	USD
CY2020	gpi	Number Of Geographic Regions NumberOfGeographicRegions	3	geographic_region
CY2020	us-gaap	Advertising Expense AdvertisingExpense	49900000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	75200000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	75200000	USD
CY2020	gpi	Manufacturer Advertising Assistance Recognized As Reduction Of Advertising Expense ManufacturerAdvertisingAssistanceRecognizedAsReductionOfAdvertisingExpense	13000000.0	USD
CY2019	gpi	Manufacturer Advertising Assistance Recognized As Reduction Of Advertising Expense ManufacturerAdvertisingAssistanceRecognizedAsReductionOfAdvertisingExpense	15400000	USD
CY2018	gpi	Manufacturer Advertising Assistance Recognized As Reduction Of Advertising Expense ManufacturerAdvertisingAssistanceRecognizedAsReductionOfAdvertisingExpense	14800000	USD
CY2020	gpi	Value Of Used Vehicle Inventory Financed ValueOfUsedVehicleInventoryFinanced	0.85
CY2020Q4	gpi	General Liability And Workers Compensation Liability GeneralLiabilityAndWorkersCompensationLiability	24000000.0	USD
CY2019Q4	gpi	General Liability And Workers Compensation Liability GeneralLiabilityAndWorkersCompensationLiability	24400000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	2000000.0	USD
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1400000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	10851800000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12043800000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11601400000	USD
CY2020	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	27600000	USD
CY2019	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	19500000	USD
CY2018	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	18700000	USD
CY2020Q4	us-gaap	Contract With Customer Refund Liability ContractWithCustomerRefundLiability	47100000	USD
CY2019Q4	us-gaap	Contract With Customer Refund Liability ContractWithCustomerRefundLiability	49700000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	21600000	USD
CY2020	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	27600000	USD
CY2020	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	13900000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	35300000	USD
CY2020	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	1300000	USD
CY2019	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	143200000	USD
CY2018	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	140400000	USD
CY2018	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	5100000	USD
CY2019	gpi	Net Gain Losson Real Estateand Dealership Transactions NetGainLossonRealEstateandDealershipTransactions	5000000.0	USD
CY2018	gpi	Net Gain Losson Real Estateand Dealership Transactions NetGainLossonRealEstateandDealershipTransactions	24400000	USD
CY2020	gpi	Proceeds From Employee Stock Purchase Plan Purchases ProceedsFromEmployeeStockPurchasePlanPurchases	9600000	USD
CY2019	gpi	Proceeds From Employee Stock Purchase Plan Purchases ProceedsFromEmployeeStockPurchasePlanPurchases	8600000	USD
CY2018	gpi	Proceeds From Employee Stock Purchase Plan Purchases ProceedsFromEmployeeStockPurchasePlanPurchases	7600000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Cash Flow Effect Cash Used To Settle Awards EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards	1100000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	32300000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	18800000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	18700000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Cash Flow Effect Cash Used To Settle Awards EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards	1100000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5000000.0	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3500000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3400000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17754666	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17917195	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19452560	shares
CY2020	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	51912	shares
CY2019	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	18879	shares
CY2018	gpi	Dilutive Effect Of Restricted Stock And Employee Stock Purchases Net Of Assumed Repurchase Of Treasury Stock DilutiveEffectOfRestrictedStockAndEmployeeStockPurchasesNetOfAssumedRepurchaseOfTreasuryStock	8492	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17806578	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17936074	shares
CY2019Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	1900000	USD
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19461052	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	286500000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2020	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	10300000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	6400000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	5400000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	276200000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	167600000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	152400000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	15.55
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.35
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.83
CY2020	us-gaap	Net Income Loss NetIncomeLoss	286500000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	174000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	157800000	USD
CY2020Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	1900000	USD
CY2019Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	0	USD
CY2020Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	300000	USD
CY2020	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	10300000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	6400000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	5400000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	276200000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	167600000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	152400000	USD
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	15.51
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.34
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.83
CY2019	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Before Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Before Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Before Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax	0	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	2300000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	1900000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	4200000	USD
CY2019Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	2800000	USD
CY2020Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	40600000	USD
CY2019Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	4400000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	44800000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	7200000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-36700000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-13300000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	6500000	USD
CY2020Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	2300000	USD
CY2020Q4	gpi	Contracts In Transit Gross ContractsInTransitGross	147100000	USD
CY2019Q4	gpi	Contracts In Transit Gross ContractsInTransitGross	169900000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Accumulated Allowance For Credit Loss ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss	0	USD
CY2020Q4	gpi	Vehicle Receivables Gross VehicleReceivablesGross	64500000	USD
CY2019Q4	gpi	Vehicle Receivables Gross VehicleReceivablesGross	84300000	USD
CY2020Q4	gpi	Contracts In Transit And Vehicle Receivables Gross ContractsInTransitAndVehicleReceivablesGross	211500000	USD
CY2019Q4	gpi	Contracts In Transit And Vehicle Receivables Gross ContractsInTransitAndVehicleReceivablesGross	254100000	USD
CY2020Q4	gpi	Contracts In Transit And Vehicle Receivables Allowance For Doubtful Accounts ContractsInTransitAndVehicleReceivablesAllowanceForDoubtfulAccounts	300000	USD
CY2019Q4	gpi	Contracts In Transit And Vehicle Receivables Allowance For Doubtful Accounts ContractsInTransitAndVehicleReceivablesAllowanceForDoubtfulAccounts	300000	USD
CY2020Q4	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	211200000	USD
CY2019Q4	gpi	Contracts In Transit And Vehicle Receivables Net ContractsInTransitAndVehicleReceivablesNet	253800000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	203100000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	227900000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	3200000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2800000	USD
CY2020Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	200000000.0	USD
CY2019Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	225100000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	35300000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	21600000	USD
CY2020Q4	us-gaap	Inventory Gross InventoryGross	1468000000.0	USD
CY2020Q4	us-gaap	Contract With Customer Asset Accumulated Allowance For Credit Loss ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss	0	USD
CY2020Q4	gpi	New Vehicles Inventory Gross NewVehiclesInventoryGross	902500000	USD
CY2019Q4	gpi	New Vehicles Inventory Gross NewVehiclesInventoryGross	1328600000	USD
CY2020Q4	gpi	Used Vehicles Inventory Gross UsedVehiclesInventoryGross	374800000	USD
CY2019Q4	gpi	Used Vehicles Inventory Gross UsedVehiclesInventoryGross	346700000	USD
CY2020Q4	gpi	Rental Vehicles Inventory Gross RentalVehiclesInventoryGross	110700000	USD
CY2019Q4	gpi	Rental Vehicles Inventory Gross RentalVehiclesInventoryGross	140900000	USD
CY2020Q4	gpi	Parts Accessoriesand Other Inventory Gross PartsAccessoriesandOtherInventoryGross	80100000	USD
CY2019Q4	gpi	Parts Accessoriesand Other Inventory Gross PartsAccessoriesandOtherInventoryGross	85500000	USD
CY2019Q4	us-gaap	Inventory Gross InventoryGross	1901700000	USD
CY2020Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	8800000	USD
CY2019Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	9700000	USD
CY2020Q4	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Inventory Cost ManufacturerFloorplanAssistanceRecognizedAsReductionOfInventoryCost	7400000	USD
CY2019Q4	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Inventory Cost ManufacturerFloorplanAssistanceRecognizedAsReductionOfInventoryCost	10700000	USD
CY2020	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Cost Of Sales ManufacturerFloorplanAssistanceRecognizedAsReductionOfCostOfSales	47300000	USD
CY2019	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Cost Of Sales ManufacturerFloorplanAssistanceRecognizedAsReductionOfCostOfSales	49100000	USD
CY2018	gpi	Manufacturer Floorplan Assistance Recognized As Reduction Of Cost Of Sales ManufacturerFloorplanAssistanceRecognizedAsReductionOfCostOfSales	47300000	USD
CY2020Q4	gpi	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	2068400000	USD
CY2019Q4	gpi	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	1947300000	USD
CY2020Q4	gpi	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	460200000	USD
CY2019Q4	gpi	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	400200000	USD
CY2020Q4	gpi	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1608200000	USD
CY2019Q4	gpi	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1547100000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	75800000	USD
CY2019	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	71600000	USD
CY2018	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	67100000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1100000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1300000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1300000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	209900000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	220100000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	117800000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	75500000	USD
CY2020Q4	gpi	Operating And Finance Lease Right Of Use Asset OperatingAndFinanceLeaseRightOfUseAsset	327700000	USD
CY2019Q4	gpi	Operating And Finance Lease Right Of Use Asset OperatingAndFinanceLeaseRightOfUseAsset	295500000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	21500000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	24600000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	9400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6600000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	207600000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	210700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	115500000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	76300000	USD
CY2020Q4	gpi	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	353900000	USD
CY2019Q4	gpi	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	318300000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	35300000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	40100000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	2000000.0	USD
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	1400000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	2800000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	2300000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	1300000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	1500000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	6300000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	5500000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	7000000.0	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	4800000	USD
CY2020	us-gaap	Lease Cost LeaseCost	52100000	USD
CY2019	us-gaap	Lease Cost LeaseCost	52600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	33400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	16200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	33300000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	12800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	31000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	11500000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	26600000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	25200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	24100000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	33900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	182000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	71200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	330300000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	170800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	101200000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	45900000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	229100000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	124900000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y9M18D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P15Y10M24D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.056
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.061
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.062
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.072
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	35200000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	41600000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	7000000.0	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	4800000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	6300000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3800000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4300000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	34000000.0	USD
CY2020	gpi	Rightof Use Asset Obtainedin Exchangefor Operating Lease Liability Modificationsand Remeasurements RightofUseAssetObtainedinExchangeforOperatingLeaseLiabilityModificationsandRemeasurements	9700000	USD
CY2019	gpi	Rightof Use Asset Obtainedin Exchangefor Operating Lease Liability Modificationsand Remeasurements RightofUseAssetObtainedinExchangeforOperatingLeaseLiabilityModificationsandRemeasurements	-9100000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	29600000	USD
CY2020	gpi	Rightof Use Asset Obtainedin Exchangefor Finance Lease Liability Modificationsand Remeasurements RightofUseAssetObtainedinExchangeforFinanceLeaseLiabilityModificationsandRemeasurements	31800000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	15700000	USD
CY2019	gpi	Rightof Use Asset Obtainedin Exchangefor Finance Lease Liability Modificationsand Remeasurements RightofUseAssetObtainedinExchangeforFinanceLeaseLiabilityModificationsandRemeasurements	8200000	USD
CY2020Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	253500000	USD
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	232800000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	963900000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	43300000	USD
CY2019	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	1600000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	2700000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1008300000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	1400000	USD
CY2020	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	2000000.0	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	10700000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	100000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	997100000	USD
CY2020Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	97800000	USD
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	17800000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	23600000	USD
CY2020Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	764600000	USD
CY2019Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	579100000	USD
CY2020Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	1362400000	USD
CY2019Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	1501600000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	0	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	5600000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	11000000.0	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	4800000	USD
CY2020Q4	gpi	Long Term Debt And Capital Lease Obligations Excluding Short Term Financing Current LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent	56700000	USD
CY2019Q4	gpi	Long Term Debt And Capital Lease Obligations Excluding Short Term Financing Current LongTermDebtAndCapitalLeaseObligationsExcludingShortTermFinancingCurrent	59100000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1294700000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1432100000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	57300000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	70100000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	94900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	144900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	93100000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	902200000	USD
CY2020Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	1362400000	USD
CY2020Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-3300000	USD
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CY2020Q3	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	700000	USD
CY2020Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	6900000	USD
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CY2020Q2	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-10400000	USD
CY2020Q2	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	1900000	USD
CY2020Q2	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	600000	USD
CY2020Q2	us-gaap	Interest Expense Debt InterestExpenseDebt	4600000	USD
CY2020Q4	us-gaap	Pledged Assets Not Separately Reported Real Estate PledgedAssetsNotSeparatelyReportedRealEstate	893600000	USD
CY2019Q4	us-gaap	Pledged Assets Not Separately Reported Real Estate PledgedAssetsNotSeparatelyReportedRealEstate	436200000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	366600000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	227900000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	192100000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	3700000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-600000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	13300000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	370300000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	227300000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	205400000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	70800000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	30900000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	35900000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	5400000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	16500000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2600000	USD
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CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3800000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4300000	USD
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CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	900000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	7000000.0	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2300000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	3900000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-5100000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-4300000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	0	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	83800000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	53300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47600000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	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	77700000	USD
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CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	47700000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	43100000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5800000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5200000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3600000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-1400000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	900000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-300000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	300000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	1100000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	1300000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	2300000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-1700000	USD
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CY2020	gpi	Deferredtaxeffecttaxcutjobactbenefit Deferredtaxeffecttaxcutjobactbenefit	0	USD
CY2019	gpi	Deferredtaxeffecttaxcutjobactbenefit Deferredtaxeffecttaxcutjobactbenefit	0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-100000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-300000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	700000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	400000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	800000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1600000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-700000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	83800000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	53300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47600000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	83800000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.226
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.234
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.234
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.232
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.232
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CY2020Q4	gpi	Deferred Tax Assets Interest Rate Swaps DeferredTaxAssetsInterestRateSwaps	10000000.0	USD
CY2019Q4	gpi	Deferred Tax Assets Interest Rate Swaps DeferredTaxAssetsInterestRateSwaps	1300000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	34500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	38200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	28900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	37600000	USD
CY2020Q4	gpi	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	56900000	USD
CY2019Q4	gpi	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	55500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	2600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	188000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	176900000	USD
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	8400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	60500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	69700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	127500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	107200000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	142000000.0	USD
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CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	71100000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	68000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	45000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	45400000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	260100000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	248500000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	132600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	141300000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	4400000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	141000000.0	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	145700000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	132600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	141300000	USD
CY2020Q4	gpi	Numberofforeignsubsidiaries Numberofforeignsubsidiaries	2	subsidiary
CY2020Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	13100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2400000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1600000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1200000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	500000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1000000.0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	600000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	500000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	100000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2000000.0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2400000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1600000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1700000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1400000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	300000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	300000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	200000	USD
CY2020Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	78400000	USD
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CY2020Q4	us-gaap	Deferred Compensation Liability Current DeferredCompensationLiabilityCurrent	5300000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Current DeferredCompensationLiabilityCurrent	3300000	USD
CY2020Q4	gpi	Guarantor Obligations Maximum Exposure Inestimable Minimum Lease Payments Guaranteed GuarantorObligationsMaximumExposureInestimableMinimumLeasePaymentsGuaranteed	28500000	USD
CY2020Q4	gpi	Lettersof Credit Outstandingas Beneficiary LettersofCreditOutstandingasBeneficiary	5700000	USD
CY2020	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-54200000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	-8800000	USD
CY2020	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-2600000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-37100000	USD
CY2019	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-13500000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	-4100000	USD
CY2019	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9200000	USD
CY2018	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-15500000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	2100000	USD
CY2018	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-1200000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-14400000	USD
CY2018	gpi	Other Comprehensive Income Loss Tax Effects Reclassified From Aoci OtherComprehensiveIncomeLossTaxEffectsReclassifiedFromAOCI	200000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	87300000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	23800000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	4300000	USD
CY2020	gpi	Increase Decreasein Capital Expenditures Accrued IncreaseDecreaseinCapitalExpendituresAccrued	-1700000	USD
CY2019	gpi	Increase Decreasein Capital Expenditures Accrued IncreaseDecreaseinCapitalExpendituresAccrued	-4100000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	92500000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	125300000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	128600000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	64000000.0	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	48300000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	40800000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	10851800000	USD
CY2020	us-gaap	Gross Profit GrossProfit	1769000000.0	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1169300000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	75800000	USD
CY2020	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	39500000	USD
CY2020	us-gaap	Interest Expense Other InterestExpenseOther	62600000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	370300000	USD
CY2020	gpi	Capital Expenditures Real Estate CapitalExpendituresRealEstate	24100000	USD
CY2020	gpi	Capital Expenditures Non Real Estate Related CapitalExpendituresNonRealEstateRelated	79100000	USD
CY2020	gpi	Capital Expenditures CapitalExpenditures	103200000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12043800000	USD
CY2019	us-gaap	Gross Profit GrossProfit	1816000000.0	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1358400000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	71600000	USD
CY2019	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	61600000	USD
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	74900000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	227300000	USD
CY2019	gpi	Capital Expenditures Real Estate CapitalExpendituresRealEstate	92500000	USD
CY2019	gpi	Capital Expenditures Non Real Estate Related CapitalExpendituresNonRealEstateRelated	99300000	USD
CY2019	gpi	Capital Expenditures CapitalExpenditures	191800000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11601400000	USD
CY2018	us-gaap	Gross Profit GrossProfit	1725100000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1273100000	USD
CY2019	gpi	Increase Decreasein Capital Expenditures Accrued IncreaseDecreaseinCapitalExpendituresAccrued	-4100000	USD
CY2018	gpi	Increase Decreasein Capital Expenditures Accrued IncreaseDecreaseinCapitalExpendituresAccrued	500000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	67100000	USD
CY2018	gpi	Floor Plan Interest Expense FloorPlanInterestExpense	59900000	USD
CY2018	us-gaap	Interest Expense Other InterestExpenseOther	75800000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	205400000	USD
CY2018	gpi	Capital Expenditures Real Estate CapitalExpendituresRealEstate	31400000	USD
CY2018	gpi	Capital Expenditures Non Real Estate Related CapitalExpendituresNonRealEstateRelated	109600000	USD
CY2018	gpi	Capital Expenditures CapitalExpenditures	141000000.0	USD
CY2020	gpi	Net Gain Losson Real Estateand Dealership Transactions NetGainLossonRealEstateandDealershipTransactions	-3100000	USD
CY2020	gpi	Increase Decreasein Capital Expenditures Accrued IncreaseDecreaseinCapitalExpendituresAccrued	-1700000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1608200000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	209900000	USD
CY2020Q4	us-gaap	Assets Assets	5089400000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1547100000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	220100000	USD
CY2019Q4	us-gaap	Assets Assets	5570200000	USD

Files In Submission

Name	View Source	Status
0001031203-21-000007-index-headers.html	Edgar Link	pending
0001031203-21-000007-index.html	Edgar Link	pending
0001031203-21-000007.txt	Edgar Link	pending
0001031203-21-000007-xbrl.zip	Edgar Link	pending
a2020ex211-subsidiariesofg.htm	Edgar Link	pending
a2020exhibit1049.htm	Edgar Link	pending
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$GPI
Group 1 Automotive Inc Stock $gpi

2020 Q4 Form 10-K Financial Statement

#000103120321000007 Filed on February 24, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

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$GPI Group 1 Automotive Inc Stock $gpi

2020 Q4 Form 10-K Financial Statement

#000103120321000007 Filed on February 24, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPI
Group 1 Automotive Inc Stock $gpi