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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Actuarial (gain) loss from remeasurement, net $ 1.4 $ (29.6)
Pension Plan, Defined Benefit [Member]    
Service costs 3.8 5.8
Interest costs 35.4 36.9
Expected return on plan assets (gains) (42.0) (47.4)
Amortization of actuarial (gains) losses, net 10.9 0.2
Actuarial (gain) loss from remeasurement, net (19.1) 55.2
Net periodic benefit cost (credit) 8.1 (4.5)
Postretirement Health and Life Benefits Plans [Member]    
Service costs 0.0 0.2
Interest costs 8.2 8.8
Expected return on plan assets (gains) (0.3) (0.8)
Amortization of actuarial (gains) losses, net (9.5) (29.8)
Actuarial (gain) loss from remeasurement, net 9.2 30.2
Amortization of prior service costs (credits), net 0.3 0.3
Net periodic benefit cost (credit) $ (1.9) $ (21.9)