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Supplemental Balance Sheet Information - Schedule of Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Trade Receivables, Net        
Allowance for doubtful receivables $ (0.6)   $ (0.8) [1]  
Trade receivables, net 388.9   319.7 [1],[2]  
Inventories        
Finished products 144.1   130.0 [1]  
Work-in-process 296.0   229.1 [1]  
Raw materials 246.8   228.7 [1]  
Operating supplies 15.4   14.1 [1]  
Inventories 702.3   601.9 [1],[2] $ 555.5
Property, Plant and Equipment, Net        
Land and improvements 38.7   37.2 [1]  
Buildings and leasehold improvements 320.9   256.3 [1]  
Machinery and equipment [3] 1,562.9   1,337.4 [1]  
Construction in progress 128.7   297.5 [1]  
Property, plant and equipment, gross 2,051.2   1,928.4 [1]  
Accumulated depreciation and amortization (851.5)   (767.5) [1]  
Land held for sale 0.1   0.3 [1]  
Property, plant and equipment, net 1,199.8   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 25.5   18.3 [1]  
Other 16.4   22.5 [1]  
Other assets 61.7   78.6 [1],[2]  
Other Accrued Liabilities        
Uncleared cash disbursements 1.4   24.5 [1]  
Accrued income taxes and other taxes payable 11.5   11.1 [1]  
Accrued annual contribution to Salaried VEBA [1]     0.7  
Accrued interest 10.5   9.9 [1]  
Short-term environmental accrual - Note 7 0.7   0.7 [1]  
Current operating lease liabilities 5.3   6.3 [1]  
Current finance lease liabilities 2.4   2.4 [1]  
Current deferred compensation plan liabilities - Note 3 0.4   6.7  
Other - Note 5 17.3   17.0 [1]  
Other accrued liabilities 49.5   79.3 [1],[2]  
Long-Term Liabilities        
Workers' compensation accrual 27.7   26.8 [1]  
Long-term environmental accrual - Note 7 17.5   17.7 [1]  
Other long-term liabilities 39.2   39.5 [1]  
Long-term liabilities 84.4   84.0 [1],[2]  
Billed        
Trade Receivables, Net        
Billed trade receivables $ 389.5   $ 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 September 30, 2025, such assets are presented within Machinery and equipment.