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Income Taxes - Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Assets, Gross [Abstract]      
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits $ 2.2 $ 2.1  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 11.4 13.0  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation 2.6 3.7  
Deferred Tax Assets, Inventory 5.2 0.9  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions 0.9 0.0  
Deferred Tax Assets, Tax Credit Carryforwards 9.6 8.6  
Deferred Tax Assets, Operating Loss Carryforwards 1.0 1.4  
Deferred Tax Asset, In-Process Research and Development 10.7 4.4  
Deferred tax assets, gross 52.1 42.2  
Deferred Tax Assets, Valuation Allowance 8.0 7.6  
Deferred Tax Assets, Net of Valuation Allowance 44.2 34.6  
Tax position taken in current year 0.9 0.4 $ 68.6
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0.0 (10.4) (0.1)
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions 78.4 0.0 $ 0.0
Deferred tax liabilities:      
Plant and equipment (124.6) (59.0)  
Deferred Tax Liabilities, Leasing Arrangements (6.8) (7.9)  
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Pension and Other Postretirement Benefits 0.0 (0.5)  
Intangible assets 0.0 (1.3)  
Deferred Tax Liabilities, Other (0.7) (1.2)  
Deferred Tax Liabilities, Gross 132.1 69.8  
Deferred Tax Liabilities, Net 88.0 35.2  
Lease Agreements [Member]      
Deferred Tax Assets, Gross [Abstract]      
Deferred Tax Assets, Other 6.9 8.1  
Other Expense [Member]      
Deferred Tax Assets, Gross [Abstract]      
Deferred Tax Assets, Other $ 1.7 $ 0.0