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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, 2012
Mar. 31, 2011
Defined Benefit Pension Plans [Member]
    
Service costs $ 3.6 $ 4.8
Interest costs 12.1 12.6
Expected return on plan assets (gains) (13.0) (13.4)
Amortization of prior service costs (credits) 0.4 0.4
Amortization of actuarial losses 4.9 2.5
Curtailment losses   3.2
Net benefit costs 8.0 10.1
Postretirement Health and Life Benefits Plans [Member]
    
Service costs 0.9 1.3
Interest costs 2.8 3.0
Expected return on plan assets (gains) (0.7) (0.9)
Amortization of actuarial losses 1.1 0.7
Net benefit costs $ 4.1 $ 4.1