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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
Mar. 31, 2014
Mar. 31, 2013
Defined Benefit Pension Plans [Member]
    
Service costs $ 0.6 $ 3.7
Interest costs 10.5 11.0
Expected return on plan assets (gains) (12.8) (12.8)
Amortization of actuarial (gains) losses, net 0.3 6.1
Amortization of prior service costs (credits) 0 0.2
Net benefit costs (1.4) 8.2
Postretirement Health and Life Benefits Plans [Member]
    
Service costs 0.5 0.9
Interest costs 2.5 2.2
Expected return on plan assets (gains) (0.5) (0.6)
Amortization of actuarial (gains) losses, net 0 0.7
Amortization of prior service costs (credits) (0.1) 0
Net benefit costs $ 2.4 $ 3.2