Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock	Noncontrolling Interest
Beginning balance (deficit) (in shares) at Dec. 31, 2018		22,783,976
Beginning Balance (deficit) at Dec. 31, 2018	$ 368.6	$ 0.0	$ 257.7	$ (2.4)	$ 120.7	$ (7.5)	$ 0.1
Increase (Decrease) in Stockholders' Equity
Net (loss) income	10.9				10.6		0.3
Foreign currency translation	0.2			0.2
Effective portion of cash flow hedge	0.0
Issuance of restricted stock units (in shares)		7,518
Issuance of restricted stock units	0.0
Issuance of performance stock units (in shares)		62,094
Issuance of performance stock units	0.0
Non-cash stock-based compensation related to restricted stock units and performance share units	0.4		0.4
Treasury stock	(2.3)					(2.3)
Distribution to noncontrolling interest	(0.7)						(0.7)
Ending balance (deficit) (in shares) at Mar. 31, 2019		22,853,588
Ending Balance (deficit) at Mar. 31, 2019	$ 377.0	$ 0.0	258.0	(2.2)	131.3	(9.8)	(0.3)
Beginning balance (deficit) (in shares) at Dec. 31, 2019	22,950,360	22,950,360
Beginning Balance (deficit) at Dec. 31, 2019	$ 373.9	$ 0.0	262.6	(2.7)	169.5	(55.3)	(0.2)
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(45.6)				(46.1)		0.5
Foreign currency translation	(0.2)			(0.2)
Effective portion of cash flow hedge	(2.8)			(2.8)
Issuance of performance stock units (in shares)		46,701
Issuance of performance stock units	0.0
Non-cash stock-based compensation related to restricted stock units and performance share units	0.3		0.3
Reversal of non-cash stock-based compensation related to performance share units	(3.2)		(3.2)
Treasury stock	(15.3)					(15.3)
Distribution to noncontrolling interest	$ (0.5)						(0.5)
Ending balance (deficit) (in shares) at Mar. 31, 2020	22,997,061	22,997,061
Ending Balance (deficit) at Mar. 31, 2020	$ 306.6	$ 0.0	$ 259.7	$ (5.7)	$ 123.4	$ (70.6)	$ (0.2)