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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 7.7 $ 7.9 $ 23.1 $ 24.3
Interest cost 22.4 22.8 67.2 67.0
Expected return on assets (33.2) (37.3) (99.6) (117.7)
Amortization of prior service cost (credit) 0.0 0.1 (0.2) 0.3
Recognized actuarial loss 15.3 13.8 45.9 41.6
Total Net Periodic Benefits Cost 12.2 7.3 36.4 15.5
Other Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 1.3 1.4 3.7 4.5
Interest cost 5.5 6.2 16.5 17.8
Expected return on assets (4.3) (5.6) (12.9) (15.6)
Amortization of prior service cost (credit) (1.2) (1.1) (3.6) (3.9)
Recognized actuarial loss 0.8 0.7 2.4 2.8
Total Net Periodic Benefits Cost $ 2.1 $ 1.6 $ 6.1 $ 5.6