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Employee Benefit Plans Pre-tax Amounts Recorded in AOCI (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
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 $ (230.3) $ (171.2)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax 0.9 1.0
Deferred Curtailment Gain (Loss) 0 0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax (229.4) (170.2)
Other Postretirement Benefit 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 (1.8) 9.2
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax 13.6 28.8
Deferred Curtailment Gain (Loss) 22.0 0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax $ 33.8 $ 38.0