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Business Combinations, Asset Acquisitions, and Joint Venture Formation (Details) - USD ($)
$ in Millions
 12 Months Ended
May 01, 2024
Dec. 31, 2024
Dec. 31, 2023
Business Acquisition [Line Items]      
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayable   $ (0.8)  
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalLiabilitiesAssumed   (0.8)  
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetAssetsAcquired   0.1  
Goodwill, Measurement Period Adjustment   (0.1)  
Business Acquisition, Pro Forma Revenue   1,572.4 $ 1,750.8
Business Acquisition, Pro Forma Net Income (Loss)   183.0 $ 124.1
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment   1.0  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   341.3  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   (27.0)  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets   0.9  
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssets   0.1  
Augusta, Georgia Mill Acquisition      
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  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other 0.4 0.4  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 609.3 610.3  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 11.8 11.8  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 724.3 725.2  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-Term Debt (0.6) (0.6)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other (7.7) (8.5)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt (8.9) (8.9)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other (12.6) (12.6)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (29.7) (30.5)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 694.5 694.7  
Goodwill 13.7 13.6  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 708.2 $ 708.2