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Non-operating Income (Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Nonoperating Income (Expense) [Abstract]        
Interest Expense $ (7.6) $ (10.4) $ (15.2) $ (18.6)
Amortization of Debt Issuance Costs (0.3) (0.4) (0.6) (0.8)
Interest Income, Other 0.3 0.1 0.6 0.1
Interest Expense, Net (7.5) (10.7) (15.1) (19.3)
Gain (Loss) on Extinguishment of Debt 0.0 (0.3) 0.0 (0.5)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component 0.1 (1.4) 0.2 (2.8)
Total non-operating expense $ (7.4) $ (12.4) $ (14.9) $ (22.7)