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Business Combinations and Asset Acquisitions (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	May 01, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment		$ 1.4
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets		1.4
Goodwill, Measurement Period Adjustment		(1.4)
Business Acquisition, Pro Forma Revenue		393.3	$ 403.0	$ 1,185.3	$ 1,324.7
Business Acquisition, Pro Forma Net Income (Loss)		5.8	$ 31.9	(16.1)	$ 97.7
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual				213.1
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual				(5.5)
Pending Augusta, Georgia Mill Acquisition [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 708.2	708.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	102.8	102.8		102.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	0.4	0.4		0.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	609.3	610.7		610.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	11.8	11.8		11.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	724.3	725.7		725.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-Term Debt	(0.6)	(0.6)		(0.6)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	(7.7)	(7.7)		(7.7)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt	(8.9)	(8.9)		(8.9)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	(12.6)	(12.6)		(12.6)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(29.7)	(29.7)		(29.7)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	694.5	695.9		695.9
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	13.7	12.3		12.3
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 708.2	$ 708.2		$ 708.2

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