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Consolidated Statements of Shareholders' Equity Statement - 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 Mar. 31, 2018 $ 1,656.7 $ 0.2 $ 147.7 $ 1,509.3 $ (0.5)
Net income 120.1 0.0 0.0 120.1 0.0
Other comprehensive income (loss) (0.3) 0.0 0.0 0.0 (0.3)
Stock-based compensation $ 3.1 $ 0.0 3.1 0.0 0.0
Restricted stock awards, net of forfeitures, shares   4,634      
Common stock repurchased, shares (6,185) (6,185)      
Common stock repurchased, value $ (2.0) $ 0.0 (0.9) (1.1) 0.0
Restricted stock units converted to common stock, shares   1,439      
Balance, shares at Mar. 31, 2018   19,309,937      
Balance at Dec. 31, 2017 $ 1,535.8 $ 0.2 145.5 1,390.3 (0.2)
Balance, shares at Dec. 31, 2018 18,972,558 18,972,558      
Balance at Mar. 31, 2019 $ 2,048.9 $ 0.2 152.2 1,896.2 0.3
Net income 164.4 0.0 0.0 164.4 0.0
Other comprehensive income (loss) 0.6 0.0 0.0 0.0 0.6
Stock-based compensation $ 2.2 $ 0.0 2.2 0.0 0.0
Restricted stock awards, net of forfeitures, shares   5,282      
Common stock repurchased, shares (268,611) (268,611)      
Common stock repurchased, value $ (109.2) $ 0.0 (4.9) (104.3) 0.0
Restricted stock units converted to common stock, shares   87,842      
Balance, shares at Mar. 31, 2019 18,797,071 18,797,071      
Balance at Dec. 31, 2018 $ 1,990.9 $ 0.2 $ 154.9 $ 1,836.1 $ (0.3)