Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic and dilutive net income (loss) available to common shareholders	$ 14.4	$ 19.0	$ (0.2)	$ (6.3)
Basic weighted average shares outstanding (in shares)	32,966	32,715	32,894	32,642
Dilutive weighted average shares outstanding (in shares)	33,794	33,322	32,894	32,642
Income (loss) Per Share – Basic (in dollars per share)	$ 0.44	$ 0.58	$ 0.00	$ (0.19)
Income (loss) Per Share – Diluted (in dollars per share)	$ 0.43	$ 0.57	$ 0.00	$ (0.19)
Stock Compensation Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unvested shares and stock units (in shares)	828	607	0	0
Antidillutive options and shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share			57	350

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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