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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 12 Months Ended
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2013
Pension Plan, Defined Benefit [Member]
Dec. 31, 2013
Pension Plan, Defined Benefit [Member]
Dec. 31, 2012
Pension Plan, Defined Benefit [Member]
Dec. 31, 2011
Pension Plan, Defined Benefit [Member]
Dec. 31, 2013
Postretirement Health and Life Benefits Plans [Member]
Dec. 31, 2012
Postretirement Health and Life Benefits Plans [Member]
Dec. 31, 2011
Postretirement Health and Life Benefits Plans [Member]
Service costs       $ 9.9 $ 14.6 $ 16.2 $ 3.6 $ 3.7 $ 4.3
Interest costs       45.0 48.3 50.3 9.0 11.1 12.2
Expected return on plan assets (gains)       (51.1) (52.0) (54.0) (2.3) (2.9) (3.7)
Amortization of prior service costs       0.7 1.5 1.7 0 0 0
Amortization of actuarial (gains) losses, net       16.2 19.7 9.4 2.7 4.5 2.6
Curtailment (gains) (1.9) (3.2) (0.7) 12.6 0 3.2 (1.0) 0 1.9
Defined Benefit Plan, Special Termination Benefits       0 0 0 10.6 0 0
Net benefit costs       $ 33.3 $ 32.1 $ 26.8 $ 22.6 $ 16.4 $ 17.3