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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost $ 20.5 $ 27.8 $ 30.2
Interest cost 68.4 40.5 31.4
Expected return on assets (94.5) (90.8) (101.6)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0.1 0.1 0.1
Recognized actuarial loss 33.7 20.3 21.7
Settlement loss 9.2 12.4 11.4
Total Net Periodic Benefits Cost 37.4 10.3 (6.8)
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 5.1 6.5 6.2
Interest cost 21.8 12.0 9.9
Expected return on assets (15.1) (16.2) (15.3)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (2.1) (2.2) (2.2)
Recognized actuarial loss 3.3 2.6 4.6
Settlement loss 0.0 0.0 0.0
Total Net Periodic Benefits Cost $ 13.0 $ 2.7 $ 3.2