Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated other comprehensive (loss)
Balance at Dec. 31, 2016	$ (12.3)	$ 1.2	$ (55.2)	$ 349.2	$ (304.7)	$ (2.8)
Balance (in shares) at Dec. 31, 2016		116,425,524	9,765,982
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	11.2			11.2
Issuance of common stock related to share-based compensation plans (in shares)		155,535
Exercise of vested stock options	$ 0.2			0.2
Exercise of vested stock options (in shares)	69,329	69,329
Dividends paid/accrued on preferred stock	$ (17.7)			(17.7)
Acquisition of treasury stock related to equity award plans (in shares)			(1,640,005)
Dividends paid/accrued on preferred stock	(4.4)		$ (4.4)
Net change on derivatives designated as cash flow hedges, net of tax of ($0.1)	0.0
Treasury stock purchases and forfeitures (in shares)			(834,440)
Reclassification of excess share-based compensation				(6.5)	6.5
Foreign currency translation adjustments	1.2					1.2
Net (loss) income	(58.8)				(58.8)
Balance at Dec. 31, 2017	33.4	$ 1.2	$ (59.6)	337.9	(244.5)	(1.6)
Balance (in shares) at Dec. 31, 2017		116,650,388	12,240,427
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	17.4			17.4
Reclassification of equity award	1.3			1.3
Issuance of common stock related to share-based compensation plans (in shares)		323,964
Issuance of common stock and stock warrants	19.2			19.2
Issuance of common stock and stock warrants (in shares)		4,665,594
Exercise of vested stock options	$ 4.3			4.3
Exercise of vested stock options (in shares)	1,713,710	1,713,710
Dividends paid/accrued on preferred stock	$ (19.1)			(19.1)
Acquisition of treasury stock related to equity award plans (in shares)			(499,069)
Dividends paid/accrued on preferred stock	(3.0)		$ (3.0)
Forfeitures (in shares)			(72,259)
Net change on derivatives designated as cash flow hedges, net of tax of ($0.1)	0.5					0.5
Foreign currency translation adjustments	(2.4)					(2.4)
Net (loss) income	(45.3)				(45.3)
Balance at Dec. 31, 2018	6.3	$ 1.2	$ (62.6)	361.0	(289.8)	(3.5)
Balance (in shares) at Dec. 31, 2018		123,353,656	12,811,755
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	18.8			18.8
Issuance of common stock related to share-based compensation plans (in shares)		1,812,993
Exercise of vested stock options	$ 13.7	$ 0.1		13.6
Exercise of vested stock options (in shares)	2,640,897	2,640,897
Dividends paid/accrued on preferred stock	$ (20.7)			(20.7)
Acquisition of treasury stock related to equity award plans (in shares)			(973,303)
Dividends paid/accrued on preferred stock	(11.0)		$ (11.0)
Forfeitures (in shares)			(1,208)
Net change on derivatives designated as cash flow hedges, net of tax of ($0.1)	(0.2)					(0.2)
Foreign currency translation adjustments	(0.8)					(0.8)
Net (loss) income	12.0				12.0
Balance at Dec. 31, 2019	$ 18.1	$ 1.3	$ (73.6)	$ 372.7	$ (277.8)	$ (4.5)
Balance (in shares) at Dec. 31, 2019		127,807,546	13,786,266