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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension Plan            
Defined Benefit Plan Disclosure [Line Items]            
Service Cost $ 7.5     $ 8.1 $ 22.6 $ 24.1
Interest cost 7.9     13.1 23.5 40.1
Expected return on assets (25.2)     (28.3) (76.3) (85.1)
Amortization of prior service credit 0.0     0.2 0.0 0.6
Recognized actuarial loss 5.5     8.6 16.3 26.0
Settlement loss (2.9) $ (3.3) $ (3.3) (8.0) (9.5) (8.0)
Total Net Periodic Benefits Cost (1.4)     9.7 (4.4) 13.7
Other Postretirement Benefit Plan            
Defined Benefit Plan Disclosure [Line Items]            
Service Cost 1.5     1.7 4.5 4.9
Interest cost 2.5     3.8 7.5 11.6
Expected return on assets (3.8)     (3.6) (11.4) (10.8)
Amortization of prior service credit (0.6)     (0.4) (1.8) (1.4)
Recognized actuarial loss 1.2     1.2 3.6 3.8
Settlement loss 0.0     0.0 0.0 0.0
Total Net Periodic Benefits Cost $ 0.8     $ 2.7 $ 2.4 $ 8.1