Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]
Beginning Balance at Dec. 31, 2014	$ 25.7	$ 0.2	$ 40.4	$ (14.9)
Net (loss) income	26.0			26.0
Payment for taxes related to share settlement of equity awards	(0.6)		(0.6)
Stock compensation expense	1.8		1.8
Ending Balance at Dec. 31, 2015	52.9	0.2	41.6	11.1
Net (loss) income	16.3			16.3
Payment for taxes related to share settlement of equity awards	(0.4)		(0.4)
Stock compensation expense	1.7	0.1	1.6
Ending Balance at Dec. 31, 2016	70.5	0.3	42.8	27.4
Net (loss) income	(7.1)			(7.1)
Payment for taxes related to share settlement of equity awards	(0.9)		(0.9)
Deferred tax adjustment for adoption | ASU-2016-09 [Member]	1.8			1.8
Stock compensation expense	2.2		2.2
Ending Balance at Dec. 31, 2017	$ 66.5	$ 0.3	$ 44.1	$ 22.1