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Supplemental Balance Sheet Information - Schedule of Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Trade Receivables, Net        
Allowance for doubtful receivables $ (0.8)   $ (0.8) [1]  
Trade receivables, net 378.7   319.7 [1],[2]  
Inventories        
Finished products 139.8   130.0 [1]  
Work-in-process 219.4   229.1 [1]  
Raw materials 221.7   228.7 [1]  
Operating supplies 14.7   14.1 [1]  
Inventories 595.6   601.9 [1],[2] $ 532.7
Property, Plant and Equipment, Net        
Land and improvements 38.5   37.2 [1]  
Buildings and leasehold improvements 319.5   256.3 [1]  
Machinery and equipment [3] 1,558.4   1,337.4 [1]  
Construction in progress 110.4   297.5 [1]  
Property, plant and equipment, gross 2,026.8   1,928.4 [1]  
Accumulated depreciation and amortization (822.2)   (767.5) [1]  
Land held for sale 0.3   0.3 [1]  
Property, plant and equipment, net 1,204.9   1,161.2 [1],[2]  
Other Assets        
Assets to be conveyed associated with Warrick acquisition   $ 18.3 18.3 [1],[3]  
Restricted cash - Note 12 19.8   19.5 [1] $ 18.3
Long-term replacement parts 24.5   18.3 [1]  
Other 23.6   22.5 [1]  
Other assets 67.9   78.6 [1],[2]  
Other Accrued Liabilities        
Uncleared cash disbursements 4.3   24.5 [1]  
Accrued income taxes and other taxes payable 11.4   11.1 [1]  
Accrued annual contribution to Salaried VEBA [1]     0.7  
Accrued interest 10.0   9.9 [1]  
Short-term environmental accrual - Note 7 0.7   0.7 [1]  
Current operating lease liabilities 5.4   6.3 [1]  
Current finance lease liabilities 2.2   2.4 [1]  
Current deferred compensation plan liabilities - Note 3 6.6   6.7 [1]  
Other - Note 5 14.5   17.0 [1]  
Other accrued liabilities 55.1   79.3 [1],[2]  
Long-Term Liabilities        
Workers' compensation accrual 27.1   26.8 [1]  
Long-term environmental accrual - Note 7 17.5   17.7 [1]  
Other long-term liabilities 40.2   39.5 [1]  
Long-term liabilities 84.8   84.0 [1],[2]  
Billed        
Trade Receivables, Net        
Billed trade receivables $ 379.5   $ 320.5 [1]  
[1] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[2] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[3] During the quarter ended March 31, 2025, $18.3 million of certain assets associated with our acquisition of Warrick were conveyed to us and placed in service. At June 30, 2025, such assets are presented within Machinery and equipment.