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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Defined Benefit Pension Plans [Member]
        
Service costs $ 0.6 $ 3.7 $ 1.2 $ 7.4
Interest costs 10.6 11.0 21.1 22.0
Expected return on plan assets (gains) (12.8) (12.7) (25.6) (25.5)
Amortization of actuarial (gains) losses, net 0.3 6.1 0.6 12.2
Amortization of prior service costs (credits) 0 0.5 0 0.7
Curtailment gains 0 (0.7) 0 (0.7)
Net benefit costs (1.3) 7.9 (2.7) 16.1
Postretirement Health and Life Benefits Plans [Member]
        
Service costs 0.4 0.9 0.9 1.8
Interest costs 2.5 2.3 5.0 4.5
Expected return on plan assets (gains) (0.5) (0.6) (1.0) (1.2)
Amortization of actuarial (gains) losses, net 0 0.7 0 1.4
Amortization of prior service costs (credits) (0.1) 0 (0.2) 0
Curtailment gains 0 0 0 0
Net benefit costs $ 2.3 $ 3.3 $ 4.7 $ 6.5