Earnings Per Share ("EPS") - Calculation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net loss from continuing operations	$ (32.1)	$ (83.3)	$ (101.2)
Net income (loss) from discontinued operations	111.4	123.1	(325.1)
Net income (loss)	$ 79.3	$ 39.8	$ (426.3)
Weighted Average Shares Outstanding:
Basic weighted average shares outstanding (in shares)	46.8	46.6	46.6
Dilutive effect of stock options and restricted share unit awards (in shares)	0.0	0.0	0.0
Diluted weighted average shares outstanding (in shares)	46.8	46.6	46.6
Basic:
Continuing operations (in dollars per share)	$ (0.69)	$ (1.79)	$ (2.17)
Discontinued operations (in dollars per share)	2.38	2.64	(6.98)
Basic Earnings (Loss) Per Share (in dollars per share)	1.69	0.85	(9.15)
Diluted:
Continuing operations (in dollars per share)	(0.69)	(1.79)	(2.17)
Discontinued operations (in dollars per share)	2.38	2.64	(6.98)
Diluted Earnings (Loss) Per Share (in dollars per share)	$ 1.69	$ 0.85	$ (9.15)
Dilutive securities excluded from computation of earnings per share (in shares)	1.0

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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- Definition

Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation.

+ References

No definition available.