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Consolidated Statements of Shareholders' Equity (Unaudited) - 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, 2018   18,972,558      
Restricted stock awards, net of forfeitures, shares   4,981      
Common stock repurchased, shares (268,611) (268,611)      
Restricted stock units converted to common stock, shares   87,842      
Balance, shares at Sep. 30, 2019   18,796,770      
Balance at Dec. 31, 2018 $ 1,990.9 $ 0.2 $ 154.9 $ 1,836.1 $ (0.3)
Net income 494.2 0.0 0.0 494.2 0.0
Other comprehensive loss 1.2 0.0 0.0 0.0 1.2
Stock-based compensation 5.7 0.0 5.7 0.0 0.0
Common stock repurchased, value (109.2) 0.0 (4.9) (104.3) 0.0
Balance at Sep. 30, 2019 2,382.8 $ 0.2 155.7 2,226.0 0.9
Balance, shares at Jun. 30, 2019   18,796,876      
Restricted stock awards, net of forfeitures, shares   (106)      
Balance, shares at Sep. 30, 2019   18,796,770      
Balance at Jun. 30, 2019 2,215.3 $ 0.2 153.7 2,060.6 0.8
Net income 165.4 0.0 0.0 165.4 0.0
Other comprehensive loss 0.1 0.0 0.0 0.0 0.1
Stock-based compensation 2.0 0.0 2.0 0.0 0.0
Balance at Sep. 30, 2019 $ 2,382.8 $ 0.2 155.7 2,226.0 0.9
Balance, shares at Dec. 31, 2019 18,352,779 18,352,779      
Restricted stock awards, net of forfeitures, shares   (148)      
Common stock repurchased, shares (725,220) (725,220)      
Restricted stock units converted to common stock, shares   21,971      
Balance, shares at Sep. 30, 2020 17,649,382 17,649,382      
Balance at Dec. 31, 2019 $ 2,355.3 $ 0.2 157.7 2,196.6 0.8
Net income 254.7 0.0 0.0 254.7 0.0
Other comprehensive loss 0.9 0.0 0.0 0.0 0.9
Stock-based compensation 4.7 0.0 4.7 0.0 0.0
Common stock repurchased, value (307.1) 0.0 (2.0) (305.1) 0.0
Balance at Sep. 30, 2020 $ 2,308.5 $ 0.2 160.4 2,146.2 1.7
Balance, shares at Jun. 30, 2020   17,649,470      
Restricted stock awards, net of forfeitures, shares   (88)      
Balance, shares at Sep. 30, 2020 17,649,382 17,649,382      
Balance at Jun. 30, 2020 $ 2,065.1 $ 0.2 158.9 1,904.1 1.9
Net income 242.1 0.0 0.0 242.1 0.0
Other comprehensive loss (0.2) 0.0 0.0 0.0 (0.2)
Stock-based compensation 1.5 0.0 1.5 0.0 0.0
Balance at Sep. 30, 2020 $ 2,308.5 $ 0.2 $ 160.4 $ 2,146.2 $ 1.7