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Pension and Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost $ 21.9 $ 20.5 $ 27.8
Interest cost 64.9 68.4 40.5
Expected return on assets (95.3) (94.5) (90.8)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0.1 0.1 0.1
Recognized actuarial loss 28.6 33.7 20.3
Settlement loss 7.2 9.2 12.4
Total Net Periodic Benefits Cost 27.4 37.4 10.3
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 5.0 5.1 6.5
Interest cost 22.0 21.8 12.0
Expected return on assets (16.1) (15.1) (16.2)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1.8) (2.1) (2.2)
Recognized actuarial loss 3.2 3.3 2.6
Settlement loss 0.0 0.0 0.0
Total Net Periodic Benefits Cost $ 12.3 $ 13.0 $ 2.7