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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, 2022
Mar. 31, 2021
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 7.1 $ 7.6
Interest cost 9.4 7.7
Expected return on assets (22.9) (25.8)
Amortization of prior service credit 0.0 0.0
Recognized actuarial loss 4.5 5.3
Total Net Periodic Benefits Cost (1.9) (1.9)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0.0 3.3
Other Postretirement Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 1.6 1.5
Interest cost 3.0 2.5
Expected return on assets (4.0) (3.8)
Amortization of prior service credit (0.6) (0.6)
Recognized actuarial loss 0.7 1.2
Total Net Periodic Benefits Cost 0.7 0.8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ 0.0 $ 0.0