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Employee Benefit Plans (Pension and other postretirement welfare plans) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Plans (Pension and other postretirement welfare plans) [Abstract]      
Defined Benefit Pension Plan, Liabilities, Noncurrent $ 36.0 $ 22.0  
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation 178.3 158.1  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.98% 5.04%  
Defined Benefit Plan, Fair Value of Plan Assets 142.3 136.1  
Pension Expense 9.3 7.4 5.6
Postemployment Benefits Liability 26.4 26.0  
Postemployment Benefits, Period Expense $ (0.1) $ (1.3) $ 1.7