Debt Extinguishment Costs, Breakage Fees

No definition available.

Name:	clw_DebtExtinguishmentCostsBreakageFees
Namespace Prefix:	clw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Extinguishment costs, Premium on Bonds

+ References

No definition available.

+ Details

Name:	clw_DebtExtinguishmentCostsPremiumOnBonds
Namespace Prefix:	clw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Instrument Redemption Notice Term

+ References

No definition available.

+ Details

Name:	clw_DebtInstrumentRedemptionNoticeTerm
Namespace Prefix:	clw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Repayment Terms, Asset Sales, Percentage Of Principal

+ References

No definition available.

+ Details

Name:	clw_DebtInstrumentRepaymentTermsAssetSalesPercentageOfPrincipal
Namespace Prefix:	clw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Repayment Terms, Percentage Of Principal

+ References

No definition available.

+ Details

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Namespace Prefix:	clw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Redemption Price Percent Of Principal Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	clw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fixed Charge Coverage Ratio

+ References

No definition available.

+ Details

Name:	clw_FixedChargeCoverageRatio
Namespace Prefix:	clw_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Lien leverage ratio

+ References

No definition available.

+ Details

Name:	clw_LienLeverageRatio
Namespace Prefix:	clw_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Potential additional lines of credit

+ References

No definition available.

+ Details

Name:	clw_Potentialadditionallinesofcredit
Namespace Prefix:	clw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-SubTopic 30
-Section 45
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (b)(1)
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase (decrease) in debt instruments, classified as other.

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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
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Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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-Topic 835
-SubTopic 30
-Section S45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 6
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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Balance Type:	credit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of the amount outstanding under the credit facility.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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Name:	us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
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-Paragraph 4
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+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as current.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, including portion classified as current.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Period Type:	instant

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Name:	us-gaap_LongTermDebtNoncurrent
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Period Type:	instant

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

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Period Type:	instant

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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-Paragraph 2
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Debt - Additional Information (Details) - USD ($)		12 Months Ended
Debt - Additional Information (Details) - USD ($)	Jul. 29, 2014	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Aug. 18, 2020	Oct. 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		3.50%
Finance Lease, Liability		$ 20,800,000	$ 22,000,000.0
Unamortized Debt Issuance Expense		(6,900,000)	(8,100,000)
Net long-term portion		716,400,000	884,500,000
Proceeds from Equity Method Investment, Distribution, Return of Capital		718,100,000	902,400,000
Proceeds from long-term debt, net		275,000,000.0	296,100,000	$ 0
Debt retirement costs		(5,900,000)	(2,700,000)	0
Write off of Deferred Debt Issuance Cost		5,900,000	2,700,000	0
Amortization of deferred issuance costs on debt		2,100,000	2,000,000.0	$ 1,400,000
Long-term Debt and Lease Obligation, Current		1,700,000	17,900,000
Long-term debt		723,300,000	892,600,000
Potential additional lines of credit		$ 100,000,000
Ratio of Indebtedness to Net Capital		2.00
Debt covenant, actual fixed charge ratio		5.1
Line of Credit Facility, Remaining Borrowing Capacity		$ 227,100,000
Lien leverage ratio		0.0238
Debt Instrument, Repayment Terms, Percentage Of Principal		0.25%
Long-term Line of Credit		$ 0	13,500,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		1,700,000
Long-term Debt, Maturities, Repayments of Principal in Year Two		1,600,000
Long-term Debt, Maturities, Repayments of Principal in Year Three		1,500,000
Long-term Debt, Maturities, Repayments of Principal in Year Four		1,500,000
Long-term Debt, Maturities, Repayments of Principal in Year Five		301,700,000
Long-term Debt, Maturities, Repayments of Principal after Year Five		417,000,000.0
Long-term Debt, Gross		$ 725,000,000.0	910,500,000
Pro Forma
Debt Instrument [Line Items]
Lien leverage ratio		0.39
Minimum
Debt Instrument [Line Items]
Debt Instrument, Repayment Terms, Asset Sales, Percentage Of Principal		0.00%
Maximum
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital		4.25
Debt Instrument, Repayment Terms, Asset Sales, Percentage Of Principal		50.00%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		3.00%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum
Debt Instrument [Line Items]
Interest rate spread		3.00%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum
Debt Instrument [Line Items]
Interest rate spread		3.25%
Base Rate [Member] \| Minimum
Debt Instrument [Line Items]
Interest rate spread		2.00%
Base Rate [Member] \| Maximum
Debt Instrument [Line Items]
Interest rate spread		2.25%
Wells Fargo [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost		$ 1,000,000.0
Credit facility, maximum borrowing capacity							$ 200,000,000
Debt Extinguishment Costs, Breakage Fees		1,700,000
Line of Credit Facility, Fair Value of Amount Outstanding							135,000,000.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		1,600,000
Debt Issuance Costs, Line of Credit Arrangements, Net		7,300,000
Northwest Farm Credit Services, PCA [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity							200,000,000
Line of Credit Facility, Fair Value of Amount Outstanding							$ 200,000,000.0
Allied Bank Limited [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		250,000,000
Potential additional lines of credit		$ 100,000,000
Ratio of Indebtedness to Net Capital		1.10
Allied Bank Limited [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		125.00%
Allied Bank Limited [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		175.00%
Allied Bank Limited [Member] \| Base Rate [Member] \| Minimum
Debt Instrument [Line Items]
Interest rate spread		25.00%
Allied Bank Limited [Member] \| Base Rate [Member] \| Maximum
Debt Instrument [Line Items]
Interest rate spread		75.00%
Term Loan [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost		$ 2,600,000
Debt Instrument, Increase (Decrease), Other, Net		170,000,000.0
Senior Note Due 2023 [Member]
Debt Instrument [Line Items]
Debt retirement costs		3,200,000
Write off of Deferred Debt Issuance Cost		1,200,000
Debt Extinguishment costs, Premium on Bonds		2,100,000
Revolving Credit Facility [Member] \| Allied Bank Limited [Member]
Debt Instrument [Line Items]
Outstanding stand by letters of credit		$ 3,600,000
Loan Lending Commitment Arrangement Fees [Member] \| Allied Bank Limited [Member] \| Minimum
Debt Instrument [Line Items]
Interest rate spread		25.00%
Loan Lending Commitment Arrangement Fees [Member] \| Allied Bank Limited [Member] \| Maximum
Debt Instrument [Line Items]
Interest rate spread		37.50%
Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		3.30%
Term Loan [Member] \| Allied Bank Limited [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 127,400,000	294,900,000
Unamortized Debt Issuance Expense		(1,900,000)	(5,100,000)
Line of Credit Facility, Fair Value of Amount Outstanding		129,600,000	300,000,000.0
Long-term Line of Credit		300,000,000
Long-term Debt, Gross		129,300,000	300,000,000.0
Line of Credit [Member] \| Allied Bank Limited [Member]
Debt Instrument [Line Items]
Long-term Line of Credit					$ 58,000,000.0
Senior Note Due 2023 [Member] \| Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value		$ 0	275,400,000
Senior Note Due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		0.00%
Long-term Debt		$ 0	273,500,000
Unamortized Debt Issuance Expense		0	(1,500,000)
Long-term Debt, Gross		0	275,000,000.0
Senior Note Due 2025 [Member] \| Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value		$ 325,100,000	298,700,000
Senior Note Due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		5.40%
Long-term Debt		$ 298,800,000	298,500,000
Unamortized Debt Issuance Expense		(1,200,000)	(1,500,000)
Debt instrument, principal amount	$ 300,000,000
Debt instrument, interest rate	5.375%
Redemption Price	100.00%
Long-term Debt, Gross		300,000,000.0	300,000,000.0
Senior Note Due 2025 [Member] \| Minimum
Debt Instrument [Line Items]
Debt Instrument Redemption Notice Term	30 days
Senior Note Due 2025 [Member] \| Maximum
Debt Instrument [Line Items]
Debt Instrument Redemption Notice Term	60 days
Senior Note Due 2028 \| Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value		$ 285,300,000	$ 0
Senior Note Due 2028
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		4.80%
Long-term Debt		$ 271,100,000
Unamortized Debt Issuance Expense		(3,900,000)
Debt instrument, principal amount						$ 275,000,000
Debt instrument, interest rate						4.75%
Long-term Debt, Gross		$ 275,000,000.0