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Employee Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits      
Service cost $ 16.2 $ 18.7 $ 16.8 [1]
Interest cost 24.6 31.2 37.3 [1]
Expected return on plan assets (38.8) (44.4) (44.5) [1]
Amortization of net actuarial losses 10.0 8.0 9.5 [1]
Amortization of prior service cost 1.0 0.4 0.8 [1]
Net loss recognized due to settlement 0.4 0.2 0.4 [1]
Net gain recognized due to curtailment (0.1) 0.0 (0.5) [1]
Special termination benefits 0.0 0.5 1.3 [1]
Net annual pension cost $ 13.3 $ 14.6 $ 21.0 [1]
Weighted average discount rate 3.60% 3.50% 4.40%
Postretirement Benefits      
Service cost $ 0.0 $ 0.0 $ 0.1
Interest cost 1.4 1.3 1.6
Amortization of net actuarial losses 0.0 0.1 0.1
Amortization of prior service cost 0.2 0.2 0.2
Other 0.0 0.0 0.2
Net annual pension cost $ 1.6 $ 1.6 $ 2.2
Weighted average discount rate 5.10% 4.60% 5.30%
[1] Rounding may impact summation of amounts.