Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic and dilutive net income (loss) available to common shareholders	$ (10.8)	$ 21.5	$ 0.7
Average Common Shares Outstanding - Basic	32,685	32,416	31,736
Dilutive weighted average shares outstanding	32,685	33,040	32,592
Earnings (Loss) Per Share - Basic (in dollars per share)	$ (0.33)	$ 0.66	$ 0.02
Earnings (Loss) Per Share - Diluted (in dollars per share)	$ (0.33)	$ 0.65	$ 0.02
Stock Compensation Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	624	616
Anti-dilutive unvested shares, options, and stock units(a)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares and options units	8	196	71
Anti-dilutive Series B Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	0	240

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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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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