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Stock-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 2.7 $ 3.5
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost 0.4  
Restricted Stock Units (RSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs 4.5  
Weighted-average period of years costs are expected to be recognied over 1.8  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 0.8 $ 0.4