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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension    
Components of Net Periodic Benefit Cost (Credit) [Abstract]    
Service Cost $ 1.6 $ 1.6
Interest Cost 9.7 10.1
Expected Return on Plan Assets (11.2) (10.9)
Amortization of Prior Service Credits 0.0 0.0
Amortization of Net Loss 1.6 1.4
Net Periodic Benefit Cost (Credit) 1.7 2.2
Other Postretirement    
Components of Net Periodic Benefit Cost (Credit) [Abstract]    
Service Cost 0.4 0.6
Interest Cost 1.0 1.5
Expected Return on Plan Assets (2.8) (2.8)
Amortization of Prior Service Credits (2.9) (1.8)
Amortization of Net Loss (0.8) (0.5)
Net Periodic Benefit Cost (Credit) $ (5.1) $ (3.0)