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Pension and other Postretirement Benefits - Narrative (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Retirement Benefits [Abstract]        
Defined Benefit Plan, Interest Cost $ 7.9 $ 5.7 $ 23.4 $ 16.8
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (7.9) (9.7) (23.4) (28.8)
Defined Benefit Plan, Amortization of Gain (Loss) 0.1 0.0 0.3 0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (0.1) $ (4.0) $ (0.3) $ (12.1)