Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic and dilutive net income (loss) available to common shareholders	$ 21.5	$ 0.7	$ (85.8)
Average Common Shares Outstanding - Basic	32,416	31,736	28,592
Dilutive weighted average shares outstanding	33,040	32,592	28,592
Earnings (Loss) Per Share - Basic (in dollars per share)	$ 0.66	$ 0.02	$ (3.00)
Earnings (Loss) Per Share - Diluted (in dollars per share)	$ 0.65	$ 0.02	$ (3.00)
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	624	616	0
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	196	71	1,072
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	240	0
Antidilutive shares and options units	0	0	982

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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