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, 2017	$ 66.5	$ 0.3	$ 44.1	$ 22.1
Net 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
Net loss	(21.3)			(21.3)
Payment for taxes related to share settlement of equity awards	(0.1)		(0.1)
Stock compensation expense	2.3		2.3
Ending Balance at Dec. 31, 2019	42.9	0.3	48.2	(5.6)
Net loss	(0.9)			(0.9)
Stock compensation expense	1.3		1.3
Ending Balance at Dec. 31, 2020	$ 43.3	$ 0.3	$ 49.5	$ (6.5)