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Employee Benefit Plans (Net Pension And Postretirement Cost) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Benefits
      
Service cost $ 14.9 $ 14.4 $ 14.4
Interest cost 33.9 38.2 40.1
Expected return on plan assets (37.6) (36.3) (37.1)
Amortization of net actuarial loss 13.3 9.5 6.4
Amortization of prior service credit (0.1) (0.1) (0.2)
Settlement loss 0.1 0.2 0.1
Special termination benefits and other 0 0 0.2
Net annual pension cost 24.5 25.9 23.9
Weighted average discount rate 4.30% 5.10% 5.60%
ENPP
      
Service cost 3.1 2.8 1.8
Interest cost 1.5 1.4 1.0
Amortization of net actuarial loss 0.7 0.3 0.1
Amortization of prior service credit 0.9 0.9 0.6
Net annual pension cost 6.2 5.4 3.5
Weighted average discount rate 3.90% 4.60% 5.40%
Rate of increase in future compensation 5.00% 5.00% 5.00%
Postretirement Benefits
      
Service cost 0.1 0.1 0.1
Interest cost 1.7 1.5 1.6
Amortization of net actuarial loss 0.5 0.4 0.3
Amortization of prior service credit 0.2 (0.2) (0.3)
Special termination benefits and other 0 (0.1)  
Net annual pension cost $ 2.5 $ 1.8 $ 1.7
Weighted average discount rate 4.70% 4.80% 5.60%