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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets, Gross [Abstract]      
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits $ 3.2 $ 3.4  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 12.9 18.5  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation 3.5 6.6  
Deferred Tax Assets, Inventory 2.2 0.2  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions 0.9 0.0  
Deferred Tax Assets, Tax Credit Carryforwards 10.1 13.5  
Deferred Tax Assets, Operating Loss Carryforwards 3.3 4.1  
Deferred tax assets, gross 49.6 61.5  
Deferred Tax Assets, Valuation Allowance 10.8 5.4  
Deferred Tax Assets, Net of Valuation Allowance 38.8 56.1  
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Pension and Other Postretirement Benefits 0.0 (1.5)  
Tax position taken in current year 68.6 0.2 $ 0.4
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0.1 0.7 $ 1.9
Deferred tax liabilities:      
Plant and equipment (168.3) (185.5)  
Deferred Tax Liabilities, Leasing Arrangements (10.8) (13.8)  
Intangible assets (1.8) (2.3)  
Deferred Tax Liabilities, Other 0.0 (0.6)  
Deferred Tax Liabilities, Gross 180.9 203.7  
Deferred Tax Liabilities, Net 142.1 147.6  
Lease Agreements [Member]      
Deferred Tax Assets, Gross [Abstract]      
Deferred Tax Assets, Other 12.0 15.2  
Other Expense [Member]      
Deferred Tax Assets, Gross [Abstract]      
Deferred Tax Assets, Other $ 1.5 $ 0.0