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Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 7.6 $ 8.0
Interest cost 7.7 13.5
Expected return on assets (25.8) (28.4)
Amortization of prior service credit 0.0 0.2
Recognized actuarial loss 5.3 8.7
Settlement loss (3.3) 0.0
Total Net Periodic Benefits Cost (1.9) 2.0
Other Postretirement Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 1.5 1.6
Interest cost 2.5 3.9
Expected return on assets (3.8) (3.6)
Amortization of prior service credit (0.6) (0.5)
Recognized actuarial loss 1.2 1.3
Settlement loss 0.0 0.0
Total Net Periodic Benefits Cost $ 0.8 $ 2.7