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Non-operating Income (Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Nonoperating Income (Expense) [Abstract]        
Interest Expense $ (8.5) $ (11.7) $ (26.9) $ (35.4)
Amortization of Debt Issuance Costs (0.5) (0.5) (1.4) (1.7)
Interest Income, Other 0.0 0.0 0.6 0.0
Interest Expense, Net (8.9) (12.2) (27.5) (37.0)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (2.8) (1.9) (7.8) (5.7)
Nonoperating Income (Expense) (12.2) (17.9) (35.7) (47.5)
Write off of Deferred Debt Issuance Cost (0.5) (3.9) (0.5) (4.8)
Amortization of Debt Issuance Costs 0.5 0.5 1.4 1.7
Interest Costs Capitalized Adjustment $ 0.1 0.0 $ 0.2 0.0
Senior Note Due 2023 [Member]        
Debt Extinguishment costs, Premium on Bonds [Abstract]       2.1
Term Loan [Member]        
Write off of Deferred Debt Issuance Cost   (0.6)   $ (1.6)
Senior Note Due 2023 [Member]        
Write off of Deferred Debt Issuance Cost   $ (1.2)    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   4.50%   4.50%
Debt Instrument, Face Amount   $ 275.0   $ 275.0