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Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net loss, basic and diluted	$ (27.6)	$ (8.0)	$ (66.8)	$ (9.5)
Denominator:
Basic weighted average common shares (in shares)	28.3	28.3	28.3	28.3
Stock options, RSUs and PSUs (in shares)	0.0	0.0	0.0	0.0
Weighted average shares used to calculate diluted earnings per share (in shares)	28.3	28.3	28.3	28.3
Loss per share:
Basic (in USD per share)	$ (0.98)	$ (0.28)	$ (2.36)	$ (0.34)
Diluted (in USD per share)	$ (0.98)	$ (0.28)	$ (2.36)	$ (0.34)
Antidilutive stock options, RSUs and PSUs
Loss per share:
Antidilutive stock options, RSUs and PSUs (in shares)	0.9	0.2	0.8	0.2

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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