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Equity and Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Net income (loss), basic and diluted                 $ 160.3 $ (19.7) $ 111.3
Denominator:                      
Basic weighted average common shares (in shares)                 28,300 28,300 30,200
Stock options, RSUs and PSUs (in shares)                 300 0 0
Weighted average shares used to calculate diluted earnings per share (in shares)                 28,600 28,300 30,200
Earnings (loss) per share:                      
Basic (in USD per share) $ 7.57 $ 0.45 $ (0.98) $ (1.39) $ (0.47) $ 0.11 $ (0.28) $ (0.05) $ 5.66 $ (0.70) $ 3.69
Diluted (in USD per share) $ 7.44 $ 0.45 $ (0.98) $ (1.39) $ (0.47) $ 0.11 $ (0.28) $ (0.05) $ 5.60 $ (0.70) $ 3.69
Antidilutive stock options, RSUs and PSUs                      
Earnings (loss) per share:                      
Antidilutive stock options, RSUs and PSUs (in shares)                 400 300 0