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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 Dec. 31, 2015   20,132,972      
Balance 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 Dec. 31, 2016   19,877,381      
Balance at Dec. 31, 2016 1,173.7 $ 0.2 131.7 1,042.0 (0.2)
Net income 470.2 0.0 0.0 470.2 0.0
Stock-based compensation $ 15.4 $ 0.0 15.4 0.0 0.0
Restricted stock awards, net of forfeitures, shares   8,092      
Repurchase of common stock, shares (610,260) (610,260)      
Repurchase of common stock $ (123.5) $ 0.0 (1.6) (121.9) 0.0
Restricted stock units converted to common stock, shares   34,836      
Balance, shares at Dec. 31, 2017 19,310,049 19,310,049      
Balance at Dec. 31, 2017 $ 1,535.8 $ 0.2 145.5 1,390.3 (0.2)
Net income 574.0 0.0 0.0 574.0 0.0
Other comprehensive income (loss) (0.1) 0.0 0.0 0.0 (0.1)
Stock-based compensation $ 10.3 $ 0.0 10.3 0.0 0.0
Restricted stock awards, net of forfeitures, shares   3,998      
Repurchase of common stock, shares (342,928) (342,928)      
Repurchase of common stock $ (129.1) $ 0.0 (0.9) (128.2) 0.0
Restricted stock units converted to common stock, shares   1,439      
Balance, shares at Dec. 31, 2018 18,972,558 18,972,558      
Balance at Dec. 31, 2018 $ 1,990.9 $ 0.2 $ 154.9 $ 1,836.1 $ (0.3)