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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Accrued Liabilities, Current [Abstract]
Compensation and benefits		$ 156.8	$ 154.4
DeRidder litigation	[1]	127.7	0.0
Franchise, property, sales and use taxes		34.2	18.6
Customer rebates and other credits		30.7	35.2
Medical insurance and workers’ compensation		28.7	28.4
Environmental liabilities and asset retirement obligations		3.4	4.0
Severance, retention, and relocation		2.0	1.0
Other		9.8	11.9
Total		$ 393.3	$ 253.5
[1] On April 24, 2024, a jury for the remaining DeRidder mill lawsuit that was tried in the U.S. District Court for the Middle District of Louisiana awarded plaintiffs compensatory damages plus interest. The amount of the verdict with interest is within the remaining limits of the Company's liability insurance policies. See Note 19, Commitments, Guarantees, Indemnifications, and Legal Proceedings for additional detail.

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes, sales and use taxes, and franchise taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Accrued medical insurance and workers compensation current.

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DeRidder Litigation

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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for the marketing, trade and selling of the entity's goods and services. Marketing costs would include expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services; costs of public relations and corporate promotions; and obligations incurred and payable for sales discounts, rebates, price protection programs, etc. offered to customers and under government programs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment.

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