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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, 2017   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
Stock-based compensation   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      
Balance at Dec. 31, 2018 1,990.9 $ 0.2 154.9 1,836.1 (0.3)
Net income 656.1 0.0 0.0 656.1 0.0
Other comprehensive income (loss) 1.1 0.0 0.0 0.0 1.1
Stock-based compensation $ 7.6 $ 0.0 7.6 0.0 0.0
Stock-based compensation   4,827      
Repurchase of common stock, shares (712,448) (712,448)      
Repurchase of common stock $ (300.4) $ 0.0 (4.8) (295.6) 0.0
Restricted stock units converted to common stock, shares   87,842      
Balance, shares at Dec. 31, 2019 18,352,779 18,352,779      
Balance at Dec. 31, 2019 $ 2,355.3 $ 0.2 157.7 2,196.6 0.8
Net income 421.0 0.0 0.0 421.0 0.0
Other comprehensive income (loss) 0.8 0.0 0.0 0.0 0.8
Stock-based compensation $ 6.2 $ 0.0 6.2 0.0 0.0
Stock-based compensation   (152)      
Repurchase of common stock, shares (1,282,166) (1,282,166)      
Repurchase of common stock $ (480.8) $ 0.0 (2.0) (478.8) 0.0
Restricted stock units converted to common stock, shares   21,971      
Balance, shares at Dec. 31, 2020 17,092,432 17,092,432      
Balance at Dec. 31, 2020 $ 2,302.5 $ 0.2 $ 161.9 $ 2,138.8 $ 1.6