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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost $ 32.0 $ 29.2 $ 31.3
Interest cost 51.6 72.3 67.1
Expected return on assets (111.6) (108.8) (142.3)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0.7 0.2 (0.4)
Recognized actuarial loss 33.8 45.2 40.6
Settlement loss 10.5 9.5 18.5
Total Net Periodic Benefits Cost 17.0 47.6 14.8
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 6.6 5.1 5.0
Interest cost 15.4 19.2 17.6
Expected return on assets (14.4) (13.1) (14.9)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (2.1) (3.2) (4.0)
Recognized actuarial loss 4.9 2.0 3.8
Settlement loss 1.5 0.0 0.0
Total Net Periodic Benefits Cost $ 11.9 $ 10.0 $ 7.5