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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Actuarial (gain) loss from remeasurement, net $ (0.8) $ (3.9) $ 0.0 $ 20.9
Pension Plan, Defined Benefit [Member]        
Service costs 1.0 1.1 2.9 3.1
Interest costs 8.9 9.2 26.6 27.8
Expected return on plan assets (gains) (10.6) (12.2) (31.6) (36.6)
Actuarial (gain) loss from remeasurement, net 0.0 24.8 0.8 20.9
Net periodic benefit cost (credit) (0.7) 22.9 (1.3) 15.2
Postretirement Health and Life Benefits Plans [Member]        
Service costs   0.1   0.2
Interest costs 2.1 2.2 6.1 6.6
Expected return on plan assets (gains) (0.1) (0.2) (0.2) (0.7)
Amortization of prior service costs (credits), net (0.1) (0.1) (0.2) (0.2)
Net periodic benefit cost (credit) $ 1.9 $ 2.0 $ 5.7 $ 5.9