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Consolidated Statements Of Shareholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance, shares at at Dec. 31, 2013   22,943,078      
Balance at at Dec. 31, 2013 $ 750.1 $ 0.2 $ 63.2 $ 686.9 $ (0.2)
Net income 266.2 0.0 0.0 266.2 0.0
Other comprehensive income (loss) 0.1 0.0 0.0 0.0 0.1
Stock-based compensation $ 15.3 $ 0.0 15.3 0.0 0.0
Restricted stock awards, net of forfeitures, shares   5,462      
Repurchase of common stock, shares (2,686,744) (2,686,744)      
Repurchase of common stock $ (343.7) $ 0.0 (4.0) (339.7) 0.0
Restricted stock units converted to common stock, shares   300,875      
Stock options exercised, shares   35,000      
Stock options exercised 0.6 $ 0.0 0.6 0.0 0.0
Tax benefits from stock-based compensation plans 13.6 $ 0.0 13.6 0.0 0.0
Balance, shares at at Dec. 31, 2014   20,597,671      
Balance at at Dec. 31, 2014 702.2 $ 0.2 88.7 613.4 (0.1)
Net income 299.7 0.0 0.0 299.7 0.0
Stock-based compensation $ 12.4 $ 0.0 12.4 0.0 0.0
Restricted stock awards, net of forfeitures, shares   4,024      
Repurchase of common stock, shares (470,071) (470,071)      
Repurchase of common stock $ (86.5) $ 0.0 (0.6) (85.9) 0.0
Restricted stock units converted to common stock, shares   1,348      
Tax benefits from stock-based compensation plans $ 0.3 $ 0.0 0.3 0.0 0.0
Balance, shares at at Dec. 31, 2015 20,132,972 20,132,972      
Balance at at Dec. 31, 2015 $ 928.1 $ 0.2 100.8 827.2 (0.1)
Net income 332.8 0.0 0.0 332.8 0.0
Other comprehensive income (loss) (0.1) 0.0 0.0 0.0 (0.1)
Stock-based compensation $ 7.4 $ 0.0 7.4 0.0 0.0
Restricted stock awards, net of forfeitures, shares   6,643      
Repurchase of common stock, shares (666,330) (666,330)      
Repurchase of common stock $ (121.7) $ 0.0 (3.7) (118.0) 0.0
Restricted stock units converted to common stock, shares   404,096      
Tax benefits from stock-based compensation plans $ 27.2 $ 0.0 27.2 0.0 0.0
Balance, shares at at Dec. 31, 2016 19,877,381 19,877,381      
Balance at at Dec. 31, 2016 $ 1,173.7 $ 0.2 $ 131.7 $ 1,042.0 $ (0.2)