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Non Operating Income and Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income and Expenses [Abstract]      
Interest Expense $ (44.4) $ (49.8) $ (39.5)
Interest Costs Capitalized 0.0 5.9 9.0
Amortization of Debt Issuance Costs (2.1) (2.0) (1.4)
Interest Income, Other 0.0 1.1 1.2
Interest expense, net (46.5) (44.9) (30.7)
Write off of Deferred Debt Issuance Cost (5.9) (2.7) 0.0
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (7.6) (5.7) (4.9)
Nonoperating Income (Expense) $ (59.9) $ (53.3) $ (35.6)