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Non-operating Income (Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Nonoperating Income (Expense) [Abstract]        
Interest Expense $ (7.4) $ (8.0) $ (22.6) $ (26.6)
Amortization of Debt Issuance Costs (0.3) (0.4) (0.9) (1.2)
Interest Income, Other 0.9 0.3 1.5 0.4
Interest Expense, Net (6.9) (8.0) (22.0) (27.3)
Gain (Loss) on Extinguishment of Debt 0.0 0.0 0.0 (0.5)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component 0.1 (1.4) 0.3 (4.3)
Total non-operating expense $ (6.8) $ (9.4) $ (21.7) $ (32.1)