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Fair Value Measurements (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]
Long-term Debt, Fair Value	$ 503.2	$ 653.3
Debt Instrument, Repurchase Amount	30.0
Term Loan [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Long-term Debt, Fair Value	0.0	49.8
Senior Note Due 2025 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Long-term Debt, Fair Value	265.3	324.6
Senior Note Due 2028 [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Long-term Debt, Fair Value	$ 237.9	$ 278.9

X

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

Name:	us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

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

X

- Details

Name:	us-gaap_DebtInstrumentAxis=clw_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=clw_SeniorNoteDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=clw_SeniorNoteDue2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: