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Employee Benefit Plans Pre-tax Amounts Recorded in AOCI (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Impact on Accumulated Other Comprehensive Income (Loss), Curtailment Gain (Loss) $ 21.8  
Pension Plans, Defined Benefit [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax (298.6) (230.3)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax (4.7) 0.9
Deferred Curtailment Gain (Loss) 0 0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax (303.3) (229.4)
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Pension and Other Postretirement Benefits, Reduction in Accumulated Other Comprehensive Loss due to Settlement Gain 0.5  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax 3.3 (1.8)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax 11.8 13.6
Deferred Curtailment Gain (Loss) 0 22.0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax $ 15.1 $ 33.8