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Pension and Postretirement Health and Life Benefits (Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amortization of prior service costs (credits) (Note 12) $ (1.5) $ (1.6) $ 6.3
Defined Benefit Pension Plans [Member]
      
Net (gain) loss 65.2 115.4 (36.7)
Amortization of actuarial (gains) losses, net (19.7) (11.6) (16.0)
Amortization of prior service costs (credits) (Note 12) (1.5) (1.6) (2.2)
Total (gain) loss recognized in other comprehensive income, pre-tax 44.0 102.2 (54.9)
Total (gain) loss recognized in net periodic benefit costs (income) and other comprehensive income, pre-tax 76.1 129.0 (17.2)
Postretirement Health and Life Benefits Plans [Member]
      
Net (gain) loss (10.1) 20.8 3.2
Amortization of actuarial (gains) losses, net (4.5) (4.6) (2.7)
Amortization of prior service costs (credits) (Note 12)     8.5
Total (gain) loss recognized in other comprehensive income, pre-tax (14.6) 16.2 9.0
Total (gain) loss recognized in net periodic benefit costs (income) and other comprehensive income, pre-tax $ 1.8 $ 33.5 $ 16.5