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Stock Repurchases (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 18, 2014
Mar. 07, 2013
Equity, Class of Treasury Stock [Line Items]            
Increase in number of shares authorized for repurchase         995,698 1,000,000
Remaining number of shares authorized for repurchase 324,456   324,456      
Common stock repurchased, shares 0 282,018 1,691,046 1,145,701    
Common stock repurchased, value $ 0 $ 31.3 $ 218.7 $ 127.2    
Open Market [Member]
            
Equity, Class of Treasury Stock [Line Items]            
Common stock repurchased, shares 0 282,018 0 1,139,442    
Common stock repurchased, value 0 31.3 0 126.5    
Tender Offer [Member]
            
Equity, Class of Treasury Stock [Line Items]            
Common stock repurchased, shares     1,553,170 0    
Common stock repurchased, value     200.3 [1] 0    
Tender offer, offering costs     0.3      
Other [Member]
            
Equity, Class of Treasury Stock [Line Items]            
Common stock repurchased, shares     137,876 [2] 6,259 [2]    
Common stock repurchased, value     $ 18.4 [2] $ 0.7 [2]    
[1] Tender Offer Cost amount includes offering costs of $0.3 million for the nine months ended September 30, 2014.
[2] Represents shares of common stock released to us as payment of tax withholdings due to us upon the vesting of restricted stock and restricted stock units.