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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Pension Plans [Member]
      
Service costs $ 14.6 $ 16.2 $ 19.3
Interest costs 48.3 50.3 48.9
Expected return on plan assets (gains) (52.0) (54.0) (48.7)
Amortization of prior service costs (credits) 1.5 1.7 1.8
Amortization of actuarial (gains) losses, net 19.7 9.4 16.0
Curtailment losses   3.2 0.4
Net benefit costs 32.1 26.8 37.7
Postretirement Health and Life Benefits Plans [Member]
      
Service costs 3.7 4.3 5.0
Interest costs 11.1 12.2 11.9
Expected return on plan assets (gains) (2.9) (3.7) (3.6)
Amortization of prior service costs (credits)     (8.5)
Amortization of actuarial (gains) losses, net 4.5 2.6 2.7
Curtailment losses   1.9  
Net benefit costs $ 16.4 $ 17.3 $ 7.5