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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense on restricted stock awards $ 32.2 $ 23.6
Unrecognized compensation expense on restricted stock awards $ 36.8  
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 2 years 6 months  
Shares awarded 966 [1]  
Time Vesting Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares awarded 500  
Performance Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares awarded 500  
[1] Weighted-average grant-date fair value of $38.65 per share and a weighted-average requisite service period of 2.5 years. The awards with market conditions included an expected volatility of 31% in the Monte Carlo simulation used to measure grant-date fair value.