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Employee Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4.7 $ 4.2 $ 14.4 $ 12.8
Interest cost 4.9 5.1 15.1 15.3
Expected return on plan assets (9.0) (8.9) (27.7) (26.7)
Amortization of net actuarial losses 3.0 3.2 9.2 9.3
Amortization of prior service cost 0.3 0.3 0.9 0.9
Net periodic pension cost 3.9 3.9 11.9 11.6
Postretirement benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost     0.1 0.1
Interest cost 0.4 0.4 1.1 1.2
Amortization of net actuarial losses     0.1 0.0
Amortization of prior service cost     0.1 0.1
Net periodic pension cost $ 0.4 $ 0.4 $ 1.4 $ 1.4