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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Pension Plans [Member]
      
Service costs $ 16.2 $ 19.3 $ 18.7
Interest costs 50.3 48.9 47.7
Expected return on plan assets (gains) (54.0) (48.7) (42.6)
Amortization of prior service costs (credits) 1.7 1.8 1.7
Amortization of actuarial (gains) losses, net 9.4 16.0 23.9
Curtailment losses 3.2 0.4  
Postretirement Health and Life Benefits Plans [Member]
      
Service costs 4.3 5.0 4.6
Interest costs 12.2 11.9 12.6
Expected return on plan assets (gains) (3.7) (3.6) (3.0)
Amortization of prior service costs (credits)   (8.5) (14.4)
Amortization of actuarial (gains) losses, net 2.6 2.7 4.2
Curtailment losses $ 1.9