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Non-operating Income (Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Nonoperating Income (Expense) [Abstract]        
Interest Expense $ (8.0) $ (8.4) $ (26.6) $ (26.7)
Amortization of Debt Issuance Costs (0.4) (0.5) (1.2) (1.4)
Interest Income, Other 0.3 0.0 0.4 0.6
Interest Expense, Net (8.0) (8.9) (27.3) (27.5)
Write off of Deferred Debt Issuance Cost 0.0 (0.5) (0.5) (0.5)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (1.4) (2.8) (4.3) (7.8)
Nonoperating Income (Expense) $ (9.4) $ (12.2) $ (32.1) $ (35.7)