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Employee Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4.8 $ 4.4 $ 9.7 $ 8.6
Interest cost 5.1 5.2 10.2 10.2
Expected return on plan assets (9.3) (9.1) (18.7) (17.8)
Amortization of net actuarial losses 3.1 3.1 6.2 6.1
Amortization of prior service cost 0.3 0.3 0.6 0.6
Net periodic pension or postretirement benefit cost 4.0 3.9 8.0 7.7
Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.1 0.1 0.1 0.1
Interest cost 0.3 0.4 0.7 0.8
Amortization of net actuarial losses 0.1 0.0 0.1 0.0
Amortization of prior service cost     0.1 0.1
Net periodic pension or postretirement benefit cost $ 0.5 $ 0.5 $ 1.0 $ 1.0