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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, 2012
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 1.3
Expected subsidies from Medicare in 2017 1.5
Expected subsidies from Medicare in 2018 to 2022 10.3
Defined Benefit Pension Plans [Member]
  
Estimated benefit plan payments in 2013 60.9
Estimated benefit plan payments in 2014 59.9
Estimated benefit plan payments in 2015 71.3
Estimated benefit plan payments in 2016 60.4
Estimated benefit plan payments in 2017 60.8
Estimated benefit plan payments in 2018 to 2022 311.3
Postretirement Health and Life Benefits Plans [Member]
  
Estimated benefit plan payments in 2013 15.3
Estimated benefit plan payments in 2014 16.3
Estimated benefit plan payments in 2015 18.4
Estimated benefit plan payments in 2016 21.0
Estimated benefit plan payments in 2017 22.7
Estimated benefit plan payments in 2018 to 2022 $ 112.8