CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Preferred stock [Member]	Common stock [Member]	Additional paid-in capital [Member]	Treasury stock, at cost [Member]	Accumulated other comprehensive loss [Member]	Accumulated deficit [Member]
Balance, start at Dec. 31, 2017	$ 829.6	$ 0.0	$ 0.9	$ 2,517.4	$ (86.3)	$ (91.7)	$ (1,510.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(0.3)						(0.3)
Other comprehensive income (loss)	0.4					0.4
Share-based compensation	0.7			0.7
Conversion of preferred stock to common stock	0.0	0.0	0.0	0.0
Balance, end at Mar. 31, 2018	830.4	0.0	0.9	2,518.1	(86.3)	(91.3)	(1,511.0)
Balance, start at Dec. 31, 2018	762.2	0.0	1.0	2,523.0	(86.3)	(98.7)	(1,576.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(34.6)						(34.6)
Other comprehensive income (loss)	0.3					0.3
Share-based compensation	0.3		0.0	0.3
Conversion of preferred stock to common stock	0.0	0.0	0.0	0.0
Balance, end at Mar. 31, 2019	$ 728.1	$ 0.0	$ 1.0	$ 2,523.3	$ (86.3)	$ (99.7)	$ (1,610.1)