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Business Combinations and Asset Acquisitions (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
May 01, 2024
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Business Combination [Line Items]        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory     $ 0.7  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment     1.0  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets     1.6  
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayable     (0.8)  
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetAssetsAcquired     0.8  
Goodwill, Measurement Period Adjustment     (0.8)  
Business Combination, Pro Forma Information, Pro Forma Revenue   $ 650.1   $ 1,271.4
Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax   $ (23.2)   $ (21.9)
Pending Augusta, Georgia Mill Acquisition [Member]        
Business Combination [Line Items]        
Business Combination, Consideration Transferred $ 708.2   708.2  
Business Combination, Recognized Asset Acquired, Inventory, Current 102.8   103.5  
Business Combination, Recognized Asset Acquired, Other Asset, Current 0.4   0.4  
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherCurrentAsset     0.1  
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment 609.3   610.3  
Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent 11.8   11.8  
Business Combination, Recognized Asset Acquired, Asset 724.3   725.9  
Business Combination, Recognized Liability Assumed, Long-Term Debt, Current (0.6)   (0.6)  
Business Combination, Recognized Liability Assumed, Other Liability, Current (7.7)   (8.5)  
Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent (8.9)   (8.9)  
Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent (12.6)   (12.6)  
Business Combination, Recognized Liability Assumed, Liability (29.7)   (30.5)  
BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalLiabilitiesAssumed     0.8  
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) 694.5   695.3  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 13.7   12.9  
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill $ 708.2   $ 708.2