$CLW
Clearwater Paper Corp Stock $clw

$clw Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000150433721000009 Filed on February 25, 2021

Income Statement

Concept	2020 Q4	2020	2019 Q4
Revenue	$452.8M	$1.869B	$435.5M
YoY Change	3.97%	6.08%	1.58%
Cost Of Revenue	$376.1M	$1.574B	$384.2M
YoY Change	-2.11%	-1.42%	0.52%
Gross Profit	$76.70M	$294.2M	$51.30M
YoY Change	49.51%	78.84%	10.32%
Gross Profit Margin	16.94%	15.74%	11.78%
Selling, General & Admin	$32.60M	$122.0M	$26.90M
YoY Change	21.19%	8.16%	-0.96%
% of Gross Profit	42.5%	41.47%	52.44%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$27.50M	$111.0M	$29.30M
YoY Change	-6.14%	-3.98%	11.41%
% of Gross Profit	35.85%	37.73%	57.12%
Operating Expenses	$34.80M	$122.0M	$33.20M
YoY Change	4.82%	8.16%	22.23%
Operating Profit	$41.90M	$158.1M	$18.10M
YoY Change	131.49%	248.24%	-110.36%
Interest Expense	-$9.500M	$44.40M	-$12.40M
YoY Change	-23.39%	-10.84%	69.86%
% of Operating Profit	-22.67%	28.08%	-68.51%
Other Income/Expense, Net	-$1.700M	-$59.90M	-$1.400M
YoY Change	21.43%	12.38%	16.67%
Pretax Income	$29.60M	$98.20M	$4.300M
YoY Change	588.37%	-1343.04%	-102.35%
Income Tax	$14.00M	$21.10M	$2.400M
% Of Pretax Income	47.3%	21.49%	55.81%
Net Earnings	$22.60M	$77.10M	$2.000M
YoY Change	1030.0%	-1476.79%	-101.07%
Net Earnings / Revenue	4.99%	4.13%	0.46%
Basic Earnings Per Share		$4.65
Diluted Earnings Per Share	$1.345M	$4.61	$121.2K
COMMON SHARES
Basic Shares Outstanding	16.57M shares	16.57M shares	16.52M shares
Diluted Shares Outstanding		16.72M shares

Balance Sheet

Concept	2020 Q4	2020	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$35.90M	$35.90M	$20.00M
YoY Change	79.5%	79.5%	-11.11%
Cash & Equivalents	$35.90M		$20.00M
Short-Term Investments
Other Short-Term Assets	$15.20M	$15.10M	$3.600M
YoY Change	322.22%	202.0%	5.88%
Inventory	$263.3M	$263.3M	$281.4M
Prepaid Expenses
Receivables	$144.6M	$144.6M	$159.1M
Other Receivables	$2.100M	$16.00M	$2.600M
Total Short-Term Assets	$474.9M	$474.9M	$465.8M
YoY Change	1.95%	1.95%	4.93%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.192B	$1.255B	$1.258B
YoY Change	-5.26%	-5.7%	-0.91%
Goodwill	$35.10M		$35.10M
YoY Change	0.0%		0.07%
Intangibles			$0.00
YoY Change			-100.0%
Long-Term Investments
YoY Change
Other Assets	$134.0M	$21.70M	$29.10M
YoY Change	360.48%	-25.43%	85.35%
Total Long-Term Assets	$1.326B	$1.326B	$1.412B
YoY Change	-6.12%	-6.12%	5.04%
TOTAL ASSETS
Total Short-Term Assets	$474.9M	$474.9M	$465.8M
Total Long-Term Assets	$1.326B	$1.326B	$1.412B
Total Assets	$1.800B	$1.800B	$1.878B
YoY Change	-4.12%	-4.12%	5.01%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$143.4M	$143.4M	$149.6M
YoY Change	-4.14%	-4.14%	-34.41%
Accrued Expenses	$58.00M	$83.00M	$60.70M
YoY Change	-4.45%	-15.65%	6.3%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change			-100.0%
Long-Term Debt Due	$1.700M	$1.700M	$17.90M
YoY Change	-90.5%	-90.5%
Total Short-Term Liabilities	$244.8M	$244.8M	$280.4M
YoY Change	-12.7%	-12.7%	-37.58%
LONG-TERM LIABILITIES
Long-Term Debt	$716.4M	$716.4M	$884.5M
YoY Change	-19.01%	-19.01%	27.65%
Other Long-Term Liabilities	$25.20M	$160.0M	$17.30M
YoY Change	45.66%	0.31%	-14.36%
Total Long-Term Liabilities	$741.6M	$876.4M	$901.8M
YoY Change	-17.76%	-16.05%	26.46%
TOTAL LIABILITIES
Total Short-Term Liabilities	$244.8M	$244.8M	$280.4M
Total Long-Term Liabilities	$741.6M	$876.4M	$901.8M
Total Liabilities	$1.279B	$1.279B	$1.446B
YoY Change	-11.51%	-11.51%	6.17%
SHAREHOLDERS EQUITY
Retained Earnings	$558.8M		$481.7M
YoY Change	16.01%		-1.15%
Common Stock	$0.00		$0.00
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares			0.000 shares
Shareholders Equity	$521.1M	$521.1M	$432.0M
YoY Change
Total Liabilities & Shareholders Equity	$1.800B	$1.800B	$1.878B
YoY Change	-4.12%	-4.12%	5.01%

Cashflow Statement

Concept	2020 Q4	2020	2019 Q4
OPERATING ACTIVITIES
Net Income	$22.60M	$77.10M	$2.000M
YoY Change	1030.0%	-1476.79%	-101.07%
Depreciation, Depletion And Amortization	$27.50M	$111.0M	$29.30M
YoY Change	-6.14%	-3.98%	11.41%
Cash From Operating Activities	$70.90M	$247.0M	$71.80M
YoY Change	-1.25%	344.24%	50.21%
INVESTING ACTIVITIES
Capital Expenditures	-$12.10M	$39.60M	-$14.30M
YoY Change	-15.38%	-71.73%	-88.25%
Acquisitions
YoY Change
Other Investing Activities	$0.00	$0.00	$0.00
YoY Change
Cash From Investing Activities	-$12.10M	-$39.60M	-$14.30M
YoY Change	-15.38%	-71.73%	-88.25%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-70.40M	-$192.9M	-45.40M
YoY Change	55.07%	-335.24%	-336.46%
NET CHANGE
Cash From Operating Activities	70.90M	$247.0M	71.80M
Cash From Investing Activities	-12.10M	-$39.60M	-14.30M
Cash From Financing Activities	-70.40M	-$192.9M	-45.40M
Net Change In Cash	-11.60M	$14.50M	12.10M
YoY Change	-195.87%	-680.0%	-122.12%
FREE CASH FLOW
Cash From Operating Activities	$70.90M	$247.0M	$71.80M
Capital Expenditures	-$12.10M	$39.60M	-$14.30M
Free Cash Flow	$83.00M	$207.4M	$86.10M
YoY Change	-3.6%	-345.44%	-49.2%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020	dei	Entity File Number EntityFileNumber	001-34146
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
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CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001441236
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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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	Entity Registrant Name EntityRegistrantName	CLEARWATER PAPER CORPORATION
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	20-3594554
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	601 West Riverside,
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 1100
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	99201
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Spokane,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	WA
CY2020	dei	City Area Code CityAreaCode	509
CY2020	dei	Local Phone Number LocalPhoneNumber	344-5900
CY2020	dei	Security12b Title Security12bTitle	Common Stock ($0.0001 par value per share)
CY2020	dei	Trading Symbol TradingSymbol	CLW
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
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CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	-400000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-1300000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5200000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-10500000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	82300000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2200000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-154300000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	77100000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-5600000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-143800000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	195100000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	111000000.0	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	115600000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	101900000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	10500000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4100000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	3300000	USD
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	33500000	USD
CY2020	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	11200000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	800000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-300000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	7100000	USD
CY2020	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	3800000	USD
CY2019	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	1400000	USD
CY2018	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-600000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5900000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-2700000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	clw	Disposal Group Not Discontinued Operation Gain Losson Write Offof Assets Divested DisposalGroupNotDiscontinuedOperationGainLossonWriteOffofAssetsDivested	1400000	USD
CY2019	clw	Disposal Group Not Discontinued Operation Gain Losson Write Offof Assets Divested DisposalGroupNotDiscontinuedOperationGainLossonWriteOffofAssetsDivested	0	USD
CY2018	clw	Disposal Group Not Discontinued Operation Gain Losson Write Offof Assets Divested DisposalGroupNotDiscontinuedOperationGainLossonWriteOffofAssetsDivested	25500000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6100000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	18000000.0	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6600000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-18100000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	21200000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	8100000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-6400000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-16500000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-53900000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	18900000	USD
CY2020	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-2500000	USD
CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	4800000	USD
CY2018	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-900000	USD
CY2020	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	7000000.0	USD
CY2019	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	20700000	USD
CY2018	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	7300000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	5600000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	6100000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	1200000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	247000000.0	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	55600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	168900000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	39600000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-140100000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	140100000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	295700000	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	70900000	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	-800000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-39600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-224000000.0	USD
CY2020	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	108500000	USD
CY2019	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	549300000	USD
CY2018	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	630800000	USD
CY2020	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	122000000.0	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	4400000	USD
CY2019	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	657700000	USD
CY2018	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	565000000.0	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	275000000.0	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	296100000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2020	us-gaap	Repayments Of Debt RepaymentsOfDebt	449400000	USD
CY2019	us-gaap	Repayments Of Debt RepaymentsOfDebt	103000000.0	USD
CY2018	us-gaap	Repayments Of Debt RepaymentsOfDebt	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2300000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2100000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-700000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-400000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-400000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-192900000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	82000000.0	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	63300000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	14400000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-2500000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	8200000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22400000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	24900000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	16700000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	36900000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22400000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	24900000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	45000000.0	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	38400000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	26100000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-7900000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3100000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-10600000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	575400000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-143800000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	5700000	USD
CY2018	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	34000	shares
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	400000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	0	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-3700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	10500000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	426400000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-5600000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	3800000	USD
CY2019	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	33000	shares
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	400000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	2800000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-7800000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	432000000.0	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	77100000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	7600000	USD
CY2020	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	57000	shares
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	700000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	1800000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-5200000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	521100000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">USE OF ESTIMATES</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of net sales and expenses during the reporting period. Actual results could differ from those estimates.</span></div>
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	35900000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	20000000.0	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	22500000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	0	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1400000	USD
CY2018Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	0	USD
CY2020Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	1100000	USD
CY2019Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	1000000.0	USD
CY2018Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	2400000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	36900000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22400000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	24900000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	139000000.0	USD
CY2019Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	149600000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1600000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1500000	USD
CY2020Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	5100000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	7400000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	16000000.0	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	300000	USD
CY2020Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	0	USD
CY2019Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	1000000.0	USD
CY2020Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	2100000	USD
CY2019Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	2600000	USD
CY2020Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	160600000	USD
CY2019Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	159400000	USD
CY2020Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	17200000	USD
CY2019Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	19400000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1781800000	USD
CY2020Q4	clw	Inventory Pulp InventoryPulp	11500000	USD
CY2019Q4	clw	Inventory Pulp InventoryPulp	20100000	USD
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	137000000.0	USD
CY2019Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	148700000	USD
CY2020Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	97700000	USD
CY2019Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	93100000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	263300000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	281400000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3072600000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3039500000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1881100000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	26700000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	26500000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1191500000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1257700000	USD
CY2020	us-gaap	Depreciation Depreciation	107800000	USD
CY2019	us-gaap	Depreciation Depreciation	108400000	USD
CY2018	us-gaap	Depreciation Depreciation	94400000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	5900000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	9000000.0	USD
CY2020	clw	Saleof Accounts Receivable SaleofAccountsReceivable	256200000	USD
CY2019	clw	Saleof Accounts Receivable SaleofAccountsReceivable	159300000	USD
CY2020	clw	Factoring Expense FactoringExpense	1200000	USD
CY2019	clw	Factoring Expense FactoringExpense	1000000.0	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1100000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	400000	USD
CY2020	us-gaap	Accretion Expense Including Asset Retirement Obligations AccretionExpenseIncludingAssetRetirementObligations	100000	USD
CY2019	us-gaap	Accretion Expense Including Asset Retirement Obligations AccretionExpenseIncludingAssetRetirementObligations	0.0	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	100000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	100000	USD
CY2020	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	2500000	USD
CY2019	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	600000	USD
CY2020	us-gaap	Asset Retirement Obligation Cash Paid To Settle AssetRetirementObligationCashPaidToSettle	0	USD
CY2019	us-gaap	Asset Retirement Obligation Cash Paid To Settle AssetRetirementObligationCashPaidToSettle	0	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	3800000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1100000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	15000000.0	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	15900000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	1200000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1800000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1700000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1800000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1900000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	1600000	USD
CY2020	us-gaap	Lease Cost LeaseCost	21000000.0	USD
CY2019	us-gaap	Lease Cost LeaseCost	19800000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	17900000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	16600000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1800000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1900000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1600000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1300000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4400000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2500000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	300000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	500000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	63500000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	73100000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	26700000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	26500000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	12700000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	11100000	USD
CY2020Q4	clw	Lease Right Of Use Assets LeaseRightOfUseAssets	77500000	USD
CY2019Q4	clw	Lease Right Of Use Assets LeaseRightOfUseAssets	88500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	1700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	1400000	USD
CY2020Q4	clw	Lease Liabilities Current LeaseLiabilitiesCurrent	17000000.0	USD
CY2019Q4	clw	Lease Liabilities Current LeaseLiabilitiesCurrent	15300000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	54300000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	65600000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	19100000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	20600000	USD
CY2020Q4	clw	Lease Liabilities Non Current LeaseLiabilitiesNonCurrent	73400000	USD
CY2019Q4	clw	Lease Liabilities Non Current LeaseLiabilitiesNonCurrent	86200000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	69500000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	79500000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	20800000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	22000000.0	USD
CY2020Q4	clw	Lease Liability LeaseLiability	90300000	USD
CY2019Q4	clw	Lease Liability LeaseLiability	101500000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y7M6D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P9Y9M18D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P10Y8M12D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y9M18D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.049	Rate
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.049	Rate
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.084	Rate
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.083	Rate
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	18200000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	3400000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	17300000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	3200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	10400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	2900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	7500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	7200000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	2800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	19500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	15900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	80200000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	30900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	10700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	10100000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	69500000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	20800000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	35100000	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	70900000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	195100000	USD
CY2018Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	59200000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7200000	USD
CY2019Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	52000000.0	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3200000	USD
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	48800000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	50100000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	46900000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	39700000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	2900000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	2200000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	2100000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	2100000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	2100000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	2100000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	13700000	USD
CY2020	clw	Cares Act Tax Benefit CARESActTaxBenefit	7000000.0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	41000000.0	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-17400000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-2100000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1100000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1800000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	100000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2100000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-15600000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-2000000.0	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3200000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	32500000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-600000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	3600000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4200000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	300000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3500000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	36700000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-300000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7100000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21100000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10300000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	20600000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-1700000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-28000000.0	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	41000000.0	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5600000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-900000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4400000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Contingencies State And Local IncomeTaxReconciliationTaxContingenciesStateAndLocal	-300000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Contingencies State And Local IncomeTaxReconciliationTaxContingenciesStateAndLocal	-1200000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Contingencies State And Local IncomeTaxReconciliationTaxContingenciesStateAndLocal	100000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-7000000.0	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	1300000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	2300000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	10900000	USD
CY2020	clw	Effective Income Tax Rate Reconciliation Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationUncertainTaxPositions	2200000	USD
CY2019	clw	Effective Income Tax Rate Reconciliation Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationUncertainTaxPositions	700000	USD
CY2018	clw	Effective Income Tax Rate Reconciliation Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationUncertainTaxPositions	0	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1200000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	600000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	700000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1100000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	400000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	200000	USD
CY2020	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-100000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-2300000	USD
CY2018	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-1100000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-200000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	2800000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21100000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10300000	USD
CY2018	clw	Tax Expenseassociatedwiththegoodwillwriteoffaspartofourassetdivestiture TaxExpenseassociatedwiththegoodwillwriteoffaspartofourassetdivestiture	2900000	USD
CY2020	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-100000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-2300000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-2300000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	3400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	3800000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	19200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	17100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	5200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	4400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	7600000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	3200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	16200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	10300000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	3900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	8800000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	68500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	89700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	5400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	5300000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	63100000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	84400000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	199700000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	179200000	USD
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	2100000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	16400000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	18900000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	3000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	3800000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	219100000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	201900000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	156000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	117500000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	3800000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	158100000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	121300000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	156000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	117500000	USD
CY2020	us-gaap	Investment Tax Credit InvestmentTaxCredit	300000	USD
CY2019	us-gaap	Investment Tax Credit InvestmentTaxCredit	1300000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	300000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4100000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	1900000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	400000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	6400000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1000000.0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	3400000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	6400000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4100000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	6400000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	3500000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2800000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	100000	USD
CY2020Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	1500000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	12600000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	13300000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Current PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesCurrent	6200000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Current PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesCurrent	7400000	USD
CY2020Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	10500000	USD
CY2019Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	7100000	USD
CY2020Q4	clw	Accrued Discounts And Allowances Current AccruedDiscountsAndAllowancesCurrent	4900000	USD
CY2019Q4	clw	Accrued Discounts And Allowances Current AccruedDiscountsAndAllowancesCurrent	6600000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	8500000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	12300000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	58000000.0	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	60700000	USD
CY2019Q4	us-gaap	Line Of Credit LineOfCredit	13500000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	20800000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	6600000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	6300000	USD
CY2020Q4	us-gaap	Long Term Debt Percentage Bearing Variable Interest Rate LongTermDebtPercentageBearingVariableInterestRate	0.035	Rate
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2019Q4	us-gaap	Line Of Credit LineOfCredit	13500000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	20800000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	22000000.0	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	22000000.0	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	725000000.0	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	6900000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	718100000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	910500000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	8100000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	902400000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	1700000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	1700000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	17900000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	17900000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	723300000	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	6900000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	716400000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	892600000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	8100000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	884500000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2100000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2000000.0	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1400000	USD
CY2020Q4	clw	Debt Instrument Repayment Terms Percentage Of Principal DebtInstrumentRepaymentTermsPercentageOfPrincipal	0.0025
CY2020Q4	clw	Potentialadditionallinesofcredit Potentialadditionallinesofcredit	100000000	USD
CY2020Q4	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	2.00
CY2020Q4	clw	Lien Leverage Ratio LienLeverageRatio	0.0238
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	227100000	USD
CY2020Q4	clw	Fixed Charge Coverage Ratio FixedChargeCoverageRatio	5.1
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	725000000.0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1700000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1600000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	301700000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	417000000.0	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	70900000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	24000000.0	USD
CY2018Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment	26800000	USD
CY2018Q4	us-gaap	Disposal Group Including Discontinued Operation Inventory1 DisposalGroupIncludingDiscontinuedOperationInventory1	3400000	USD
CY2018	clw	Finite Lived Intangible Assets Writtenoff Relatedto Assets Divested FiniteLivedIntangibleAssetsWrittenoffRelatedtoAssetsDivested	-900000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	1400000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	0	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	24000000.0	USD
CY2020	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-14000000.0	USD
CY2019	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-6300000	USD
CY2018	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	17500000	USD
CY2020	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-14000000.0	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	1400000	USD
CY2019	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-6300000	USD
CY2018	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	17500000	USD
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.077
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	24000000.0	USD
CY2020	us-gaap	Interest Expense InterestExpense	44400000	USD
CY2019	us-gaap	Interest Expense InterestExpense	49800000	USD
CY2018	us-gaap	Interest Expense InterestExpense	39500000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	0	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	5900000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	9000000.0	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2100000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2000000.0	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1400000	USD
CY2020	us-gaap	Interest Income Other InterestIncomeOther	0	USD
CY2020	us-gaap	Interest Income Other InterestIncomeOther	0	USD
CY2019	us-gaap	Interest Income Other InterestIncomeOther	1100000	USD
CY2019	us-gaap	Interest Income Other InterestIncomeOther	1100000	USD
CY2018	us-gaap	Interest Income Other InterestIncomeOther	1200000	USD
CY2018	us-gaap	Interest Income Other InterestIncomeOther	1200000	USD
CY2020	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-46500000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-44900000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-30700000	USD
CY2020	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	5900000	USD
CY2019	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	2700000	USD
CY2018	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	0	USD
CY2020	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-7600000	USD
CY2019	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-5700000	USD
CY2018	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-4900000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-59900000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-53300000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-35600000	USD
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.042
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0.035	USD
CY2020	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	17300000	USD
CY2019	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	15300000	USD
CY2018	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	14700000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	1000000.0	USD
CY2019Q4	us-gaap	Defined Benefit Pension Plan Current And Noncurrent Liabilities DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities	9900000	USD
CY2020Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	74200000	USD
CY2019Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	66400000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	188700000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	178500000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	188700000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	178500000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	176200000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	160800000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5200000	USD
CY2020Q4	clw	Defined Benefit Plan Numberof Investment Options Holding Substantially All Pension Funds DefinedBenefitPlanNumberofInvestmentOptionsHoldingSubstantiallyAllPensionFunds	8	option
CY2020	clw	Multiemployer Plans Numberof Participating Facilities MultiemployerPlansNumberofParticipatingFacilities	1	facility
CY2020Q4	us-gaap	Multiemployer Plans Withdrawal Obligation MultiemployerPlansWithdrawalObligation	82000000	USD
CY2020	clw	Multiemployer Defined Benefit Plans Contribution Rate MultiemployerDefinedBenefitPlansContributionRate	4.00
	clw	Multiemployer Plans Additional Contribution Percentageof Contractual Contribution Rate MultiemployerPlansAdditionalContributionPercentageofContractualContributionRate	0.025
CY2020	us-gaap	Multiemployer Plan Pension Significant Employer Contribution Cost MultiemployerPlanPensionSignificantEmployerContributionCost	5700000	USD
CY2019	us-gaap	Multiemployer Plan Pension Significant Employer Contribution Cost MultiemployerPlanPensionSignificantEmployerContributionCost	5600000	USD
CY2018	us-gaap	Multiemployer Plan Pension Significant Employer Contribution Cost MultiemployerPlanPensionSignificantEmployerContributionCost	5700000	USD
CY2020Q4	us-gaap	Other Deferred Compensation Arrangements Liability Current And Noncurrent OtherDeferredCompensationArrangementsLiabilityCurrentAndNoncurrent	3200000	USD
CY2019Q4	us-gaap	Other Deferred Compensation Arrangements Liability Current And Noncurrent OtherDeferredCompensationArrangementsLiabilityCurrentAndNoncurrent	2500000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16569000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16533000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16487000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16724000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16533000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16487000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.65
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.34
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-8.72
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.61
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.34
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-8.72
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	500000	shares
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.0001
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000000.0	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	900000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	1300000	shares
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	10500000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4100000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	3300000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2700000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1000000.0	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1500000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	700000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	400000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	400000	USD
CY2019Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	656374	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	49.36
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P6Y2M12D
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0	USD
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	972	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	29.12
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares	23164	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	37.49
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	278792	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	50.71
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	353446	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	49.13
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y2M12D
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber	325161	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	50.16
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P5Y
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue	0	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	14.51
CY2020Q4	clw	Percentage Of Expected Natural Gas Requirement Covered Under Contract For Next Fiscal Year PercentageOfExpectedNaturalGasRequirementCoveredUnderContractForNextFiscalYear	0.17
CY2020	us-gaap	Revenues Revenues	1868600000	USD
CY2019	us-gaap	Revenues Revenues	1761500000	USD
CY2018	us-gaap	Revenues Revenues	1724200000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	195100000	USD
CY2020	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-14000000.0	USD
CY2019	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-6300000	USD
CY2018	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	17500000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	158100000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	111000000.0	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	45400000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	-97900000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	115600000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	101900000	USD
CY2020Q4	us-gaap	Assets Assets	1800400000	USD
CY2019Q4	us-gaap	Assets Assets	1877700000	USD
CY2018Q4	us-gaap	Assets Assets	1788100000	USD
CY2020	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	39600000	USD
CY2019	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	140100000	USD
CY2018	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	295700000	USD
CY2020	us-gaap	Segment Reporting Disclosure Of Major Customers SegmentReportingDisclosureOfMajorCustomers	14%
CY2019	us-gaap	Segment Reporting Disclosure Of Major Customers SegmentReportingDisclosureOfMajorCustomers	no
CY2018	us-gaap	Segment Reporting Disclosure Of Major Customers SegmentReportingDisclosureOfMajorCustomers	11
CY2020	us-gaap	Revenues Revenues	1868600000	USD
CY2019	us-gaap	Revenues Revenues	1761500000	USD
CY2018	us-gaap	Revenues Revenues	1724200000	USD
CY2020	us-gaap	Revenues Revenues	1868600000	USD
CY2019	us-gaap	Revenues Revenues	1761500000	USD
CY2018	us-gaap	Revenues Revenues	1724200000	USD

Files In Submission

Name	View Source	Status
0001504337-21-000009-index-headers.html	Edgar Link	pending
0001504337-21-000009-index.html	Edgar Link	pending
0001504337-21-000009.txt	Edgar Link	pending
0001504337-21-000009-xbrl.zip	Edgar Link	pending
clw-20201231.htm	Edgar Link	pending
clw-20201231.xsd	Edgar Link	pending
clw-20201231_cal.xml	Edgar Link	unprocessable
clw-20201231_def.xml	Edgar Link	unprocessable
clw-20201231_g1.jpg	Edgar Link	pending
clw-20201231_g2.jpg	Edgar Link	pending
clw-20201231_g3.jpg	Edgar Link	pending
clw-20201231_g4.jpg	Edgar Link	pending
clw-20201231_g5.jpg	Edgar Link	pending
clw-20201231_htm.xml	Edgar Link	completed
clw-20201231_lab.xml	Edgar Link	unprocessable
clw-20201231_pre.xml	Edgar Link	unprocessable
ex23consent.htm	Edgar Link	pending
ex31q4-20.htm	Edgar Link	pending
ex32q4-20.htm	Edgar Link	pending
exhibit24-poa.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$CLW
Clearwater Paper Corp Stock $clw

2020 Q4 Form 10-K Financial Statement

#000150433721000009 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CLW Clearwater Paper Corp Stock $clw

2020 Q4 Form 10-K Financial Statement

#000150433721000009 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CLW
Clearwater Paper Corp Stock $clw