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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]      
Accounts Receivable, before Allowance for Credit Loss $ 173.8 $ 167.6  
Accounts Receivable, Allowance for Credit Loss, Current (1.5) (1.4)  
Unbilled Receivables, Current 4.1 9.1  
Income Taxes Receivable, Current 4.8 10.6  
Other Receivables, Net, Current 3.1 2.9  
Receivables, net of allowance for current expected credit losses of $1.5 and $1.4 at December 31, 2023 and 2022 184.5 188.8  
Inventory, Finished Goods, Gross 156.8 171.9  
Other Inventory, Supplies, Gross 124.1 111.7  
Depreciation and amortization 98.6 103.3 $ 105.0
Asset Retirement Obligation 2.0 1.9 2.0
Accretion Expense, Including Asset Retirement Obligations 0.1 0.0  
Increase (Decrease) in Asset Retirement Obligations 0.0 0.0 $ (1.8)
Asset Retirement Obligation, Cash Paid to Settle $ (0.1) $ (0.1)