Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic and dilutive net income (loss) available to common shareholders	$ 20.2	$ (10.8)	$ 21.5
Average Common Shares Outstanding - Basic (in shares)	32,983	32,685	32,416
Dilutive weighted average shares outstanding (in shares)	33,859	32,685	33,040
Earnings (Loss) Per Share - Basic (in dollars per share)	$ 0.61	$ (0.33)	$ 0.66
Earnings (Loss) Per Share - Diluted (in dollars per share)	$ 0.60	$ (0.33)	$ 0.65
Stock Compensation Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unvested shares and stock units (in shares)	876	0	624
Anti-dilutive unvested shares and options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive unvested shares and options (in shares)	51	8	196

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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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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