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Pension and other Postretirement Benefits - Narrative (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Retirement Benefits [Abstract]        
Defined Benefit Plan, Interest Cost $ 7.4 $ 7.8 $ 14.8 $ 15.5
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (7.9) (7.8) (15.8) (15.5)
Defined Benefit Plan, Amortization of Gain (Loss) 0.2 0.1 0.4 0.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (0.7) $ (0.1) $ (1.4) $ (0.2)