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Pension Plans and Other Postretirement Benefits (Details 10) (Pension Benefits [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Pension Benefits [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 2,619.6 $ 2,952.0
Accumulated benefit obligation 2,545.4 2,865.4
Fair value of plan assets $ 2,246.1 $ 2,220.0