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Pension and Postretirement Health and Life Benefits (Schedule of Estimated Future Benefit Payments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Defined Benefit Pension Plans [Member]
  
Estimated benefit plan payments in 2012 $ 58.1
Estimated benefit plan payments in 2013 69.8
Estimated benefit plan payments in 2014 58.7
Estimated benefit plan payments in 2015 59.1
Estimated benefit plan payments in 2016 59.5
Estimated benefit plan payments in 2017 to 2021 307.8
Postretirement Health and Life Benefits Plans [Member]
  
Estimated benefit plan payments in 2012 15.6
Estimated benefit plan payments in 2013 17.0
Estimated benefit plan payments in 2014 18.3
Estimated benefit plan payments in 2015 20.4
Estimated benefit plan payments in 2016 23.5
Estimated benefit plan payments in 2017 to 2021 125.4
Expected subsidies from Medicare in 2012 0.5
Expected subsidies from Medicare in 2013 0.7
Expected subsidies from Medicare in 2014 0.9
Expected subsidies from Medicare in 2015 1.1
Expected subsidies from Medicare in 2016 1.4
Expected subsidies from Medicare in 2017 to 2021 $ 9.7