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Pension and other Postretirement Benefits - Narrative (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Retirement Benefits [Abstract]    
Defined Benefit Plan, Interest Cost $ 7.4 $ 7.7
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (7.9) (7.7)
Defined Benefit Plan, Amortization of Gain (Loss) 0.2 0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (0.7) $ (0.1)