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Pension and Other Postretirement Benefits (Schedule of Benefit Obligations in Excess of Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation $ 1,416.8 $ 1,834.4  
Defined Benefit Plan, Benefit Obligation 1,427.4 1,852.4 $ 2,058.4
Defined Benefit Plan, Funded (Unfunded) Status of Plan (4.6) 129.3  
Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Benefit Obligation 449.0 556.2 $ 590.8
Defined Benefit Plan, Funded (Unfunded) Status of Plan (224.1) (262.5)  
Underfunded Plan [Member] | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation 22.9 30.0  
Defined Benefit Plan, Benefit Obligation 22.9 30.0  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (22.9) (30.0)  
Underfunded Plan [Member] | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation 1,393.8 1,804.3  
Defined Benefit Plan, Benefit Obligation 1,404.5 1,822.4  
Defined Benefit Plan, Plan Assets, Amount 1,422.8 1,981.7  
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ 18.3 $ 159.3