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Pension and Other Postretirement Benefit Plans - Unrecognized Costs (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Pension [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Net Loss $ 286.8 $ 269.0
Prior Service Cost (Credit) 0.7 1.1
Total Unrecognized Costs 287.5 270.1
Postretirement Health and Life [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Net Loss 23.5 78.5
Prior Service Cost (Credit) (13.1) (9.5)
Transition Obligation 0 0.1
Total Unrecognized Costs $ 10.4 $ 69.1