Earnings (Loss) Per Common Share - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share and Other Significant Changes in Shares [Line Items]
Amount of shares repurchased (shares)	0	218,005	0	881,546
Amount of shares repurchased		$ 1.0		$ 3.6
Amount of shares issued (shares)	82,993	0	167,460	46,896
Amount of shares issued	$ 0.4		$ 0.8	$ 0.1
Non-qualified Option [Member]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share and Other Significant Changes in Shares [Line Items]
Weighted average shares outstanding excludes anti-dilutive shares underlying options (shares)	3,300,000	3,400,000	3,300,000	3,400,000
Restricted Stock Units (RSUs) [Member]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share and Other Significant Changes in Shares [Line Items]
Weighted average shares outstanding excludes anti-dilutive shares underlying options (shares)	1,900,000	2,700,000	1,900,000	2,700,000