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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, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Defined Benefit Pension Plans [Member]
        
Service costs $ 3.7 $ 3.2 $ 7.3 $ 8.0
Interest costs 12.0 12.5 24.1 25.1
Expected return on plan assets (gains) (13.0) (13.5) (26.0) (26.9)
Amortization of prior service costs 0.4 0.4 0.8 0.8
Amortization of actuarial losses 4.9 2.2 9.8 4.7
Curtailment losses       3.2
Net benefit costs 8.0 4.8 16.0 14.9
Postretirement Health and Life Benefits Plans [Member]
        
Service costs 0.9 1.4 1.8 2.7
Interest costs 2.8 3.1 5.6 6.1
Expected return on plan assets (gains) (0.7) (0.9) (1.4) (1.8)
Amortization of actuarial losses 1.1 0.6 2.2 1.3
Curtailment losses   1.9   1.9
Net benefit costs $ 4.1 $ 6.1 $ 8.2 $ 10.2