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Employee Benefit Plans (Net Pension And Postretirement 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 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4.1 $ 4.6 $ 12.3 $ 13.9
Interest cost 6.2 7.8 19.0 23.4
Expected return on plan assets (9.8) (11.2) (30.2) (33.4)
Amortization of net actuarial loss 2.5 2.8 7.8 8.4
Amortization of prior service cost 0.3 0.1 0.8 0.3
Net periodic pension or postretirement benefit cost 3.3 4.1 9.7 12.6
Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 0.3 0.3 1.1 1.0
Amortization of net actuarial loss 0.0 0.1 0.0 0.1
Amortization of prior service cost     0.1 0.1
Net periodic pension or postretirement benefit cost $ 0.3 $ 0.4 $ 1.2 $ 1.2