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Pension and Other Postretirement Benefit Plans - Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets (Details) (Pension [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Pension [Member]
   
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Projected Benefit Obligation $ 652.1 $ 597.5
Accumulated Benefit Obligation 598.7 550.6
Fair Value of Plan Assets $ 460.1 $ 432.4