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Stock Repurchases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 07, 2013
Equity, Class of Treasury Stock [Line Items]          
Increase in number of shares authorized for repurchase         1,000,000
Remaining number of shares authorized for repurchase 324,456   324,456    
Common stock repurchased, shares     6,065 1,691,046  
Common stock repurchased, value     $ 1.1 $ 218.7  
Tender Offer [Member]          
Equity, Class of Treasury Stock [Line Items]          
Common stock repurchased, shares 0 915,750 0 1,553,170  
Common stock repurchased, value $ 0.0 $ 115.1 [1] $ 0.0 $ 200.3 [1]  
Tender offer, offering costs   $ 0.1   $ 0.3  
Other [Member]          
Equity, Class of Treasury Stock [Line Items]          
Common stock repurchased, shares [2]     6,065 137,876  
Common stock repurchased, value [2]     $ 1.1 $ 18.4  
[1] Tender Offer Cost amounts include offering costs of $0.1 million and $0.3 million for the three and six months ended June 30, 2014, respectively.
[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.