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Commitments and Contingencies Commitments and Contingencies Additional Information (Details)	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Firm price contracts, percentage of expected average monthly natural gas and electricity needs covered	44.00%

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- Definition

Percentage Of Expected Natural Gas Requirement Covered Under Contract For Next Fiscal Year

+ References

No definition available.

+ Details

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Namespace Prefix:	clw_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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