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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

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