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Employee Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits      
Service cost $ 16.6 $ 17.1 $ 16.2
Interest cost 19.9 20.6 24.6
Expected return on plan assets (34.0) (35.9) (38.8)
Amortization of net actuarial losses 13.8 13.4 10.0
Amortization of prior service cost 1.2 1.2 1.0
Net loss recognized due to settlement 0.9 0.2 0.4
Net gain recognized due to curtailment 0.0 0.0 (0.1)
Net annual pension cost $ 18.4 $ 16.6 $ 13.3
Weighted average discount rate 2.50% 2.70% 3.60%
Postretirement Benefits      
Service cost $ 0.1 $ 0.1 $ 0.0
Interest cost 1.4 1.4 1.4
Amortization of net actuarial losses 0.1 0.1 0.0
Amortization of prior service cost 0.2 0.2 0.2
Net annual pension cost $ 1.8 $ 1.8 $ 1.6
Weighted average discount rate 4.90% 5.30% 5.10%