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Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 5.1 $ 6.8 $ 15.3 $ 20.9
Interest cost 17.1 10.7 51.3 29.9
Expected return on assets (23.6) (22.6) (70.8) (68.3)
Amortization of prior service credit 0.0 0.0 0.0 0.0
Recognized actuarial loss 8.4 5.6 25.2 14.9
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 7.4 3.0 7.5 9.3
Total Net Periodic Benefits Cost 14.4 3.5 28.5 6.7
Other Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 1.3 1.6 3.9 4.8
Interest cost 5.4 3.0 16.3 9.0
Expected return on assets (3.8) (4.0) (11.4) (12.0)
Amortization of prior service credit (0.5) (0.6) (1.5) (1.8)
Recognized actuarial loss 0.8 0.7 2.4 2.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0.0 0.0 0.0 0.0
Total Net Periodic Benefits Cost $ 3.2 $ 0.7 $ 9.7 $ 2.1