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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension [Member]    
Components of Net Periodic Benefit Cost (Credit) [Abstract]    
Service Cost $ 1.6 $ 2.4
Interest Cost [1] 10.1 6.7
Expected Return on Plan Assets [1] (10.9) (10.4)
Amortization of Prior Service Credits [1] 0.0 0.0
Amortization of Net Loss [1] 1.4 3.2
Net Periodic Benefit Cost (Credit) 2.2 1.9
Employer Contributions to Defined Benefit Plans 6.5 0.0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 10.0  
Other Postretirement [Member]    
Components of Net Periodic Benefit Cost (Credit) [Abstract]    
Service Cost 0.6 0.8
Interest Cost [1] 1.5 1.1
Expected Return on Plan Assets [1] (2.8) (2.4)
Amortization of Prior Service Credits [1] (1.8) (1.9)
Amortization of Net Loss [1] (0.5) 0.1
Net Periodic Benefit Cost (Credit) (3.0) (2.3)
Employer Contributions to Defined Benefit Plans 0.0 $ 0.0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year $ 0.0  
[1] These components of net periodic benefit cost (credit) are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income