Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic and Diluted	$ 27.1	$ 26.0	$ 15.1	$ 4.4
Basic weighted average shares outstanding	32,459	31,929	32,362	31,367
Dilutive weighted average shares outstanding	32,854	32,582	32,814	32,562
Basic earnings per share (in dollars per share)	$ 0.84	$ 0.81	$ 0.47	$ 0.14
Diluted earnings per share (in dollars per share)	$ 0.83	$ 0.80	$ 0.46	$ 0.13
Anti-dilutive securities excluded from computation of earnings per share			497	237
Unvested shares and stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities:	395	653	452	711
Series B Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities:	0	0	0	484

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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