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, 2015	$ 52.9	$ 0.2	$ 41.6	$ 11.1
Net income (loss)	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 income (loss)	(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
Net income (loss)	(6.4)			(6.4)
Payment for taxes related to share settlement of equity awards	(0.4)		(0.4)
Stock compensation expense	2.3		2.3
Ending Balance at Dec. 31, 2018	$ 62.0	$ 0.3	$ 46.0	$ 15.7