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Non-operating Income (Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Nonoperating Income (Expense) [Abstract]        
Interest Expense $ (9.2) $ (11.5) $ (18.4) $ (23.8)
Amortization of Debt Issuance Costs (0.5) (0.5) (0.9) (1.1)
Interest Income, Other 0.2 0.0 0.6 0.0
Interest Expense, Net (9.3) (12.0) (18.6) (24.9)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (2.5) (2.0) (5.0) (3.8)
Nonoperating Income (Expense) (11.8) (14.9) (23.6) (29.6)
Amortization of Debt Issuance Costs 0.5 0.5 0.9 1.1
Interest Costs Capitalized Adjustment 0.1 0.0 0.1 0.0
Term Loan [Member]        
Write off of Deferred Debt Issuance Cost $ 0.0 $ (1.0) $ 0.0 $ (1.0)