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Stock-Based Compensation Restricted Stock Units (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
years
Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Incentive shares granted 822,000  
Ending balance 352,178  
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Outstanding, Intrinsic Value $ 16.2  
Restricted Stock Units (RSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost 0.8 0.4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Beginning balance 1,112,868  
Incentive shares granted 314,552  
Incentive share awards vested (407,909)  
Incentive share awards cancelled (19,362)  
Ending balance 1,000,149  
Incentive share awards outstanding Weighted Average Contractual Term (in years) 1.82  
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Outstanding, Intrinsic Value 9.4  
Vested and expected to vest 950,142  
Vested and expected to vest Weighted Average Contractual Term (in years)     
Vested and expected to vest Aggregate Intrinsic Value (in millions) 8.9  
Incentive share awards exercisable 0  
Incentive share awards exercisable Weighted Average Contractual Term (in years) 0  
Incentive share awards exercisable Aggregate Intrinsic Value (in millions) $ 0