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Pension and other Postretirement Benefits - Narrative (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Retirement Benefits [Abstract]    
Defined Benefit Plan, Interest Cost $ 7.7 $ 5.5
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (7.7) (9.5)
Defined Benefit Plan, Amortization of Gain (Loss) 0.1 0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (0.1) $ (4.0)