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Pension and Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Service Cost $ 31.3 $ 30.0 $ 31.3 $ 30.0 $ 30.7
Interest cost 67.1 68.3 67.1 68.3 89.7
Expected return on assets (142.3) (123.1)     (132.9)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (0.4) (0.7) (0.4) (0.7) (0.2)
Recognized actuarial loss 40.6 52.9 40.6 52.9 61.2
Settlement loss 18.5 13.7 18.5 13.7 0.0
Total Net Periodic Benefits Cost     14.8 41.1 48.5
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service Cost 5.0 4.8 5.0 4.8 5.0
Interest cost 17.6 17.8 17.6 17.8 22.0
Expected return on assets (14.9) (15.9)     (17.2)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (4.0) (4.4) (4.0) (4.4) (4.9)
Recognized actuarial loss 3.8 3.0 3.8 3.0 3.1
Settlement loss $ 0.0 $ 0.0 0.0 0.0 0.0
Total Net Periodic Benefits Cost     $ 7.5 $ 5.3 $ 8.0