Consolidated Statements of Stockholders' Equity (Deficit) (unaudited) - 6 months ended Jun. 30, 2018 - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated other comprehensive (loss)
Beginning Balance (in shares) at Dec. 31, 2017		116,650,388	12,240,427
Beginning Balance at Dec. 31, 2017	$ 33.4	$ 1.2	$ (59.6)	$ 337.9	$ (244.5)	$ (1.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	7.9			7.9
Reclassification of equity award	1.3			1.3
Issuance of common stock related to share-based compensation plans (in shares)		293,103
Issuance of Common Stock and Stock Warrants (in shares)		4,665,594
Issuance of Common Stock and Stock Warrants	$ 19.3			19.3
Exercise of vested stock options (in shares)	1,117,588	1,117,588
Exercise of vested stock options	$ 2.8			2.8
Dividends paid/accrued dividends (in shares)			0
Dividends paid/accrued dividends	(9.4)			(9.4)
Acquisition of treasury stock related to equity award plans (in shares)			(497,300)
Acquisition of treasury stock related to equity award plans	(2.9)		$ (2.9)
Forfeitures (in shares)			(18,945)
Net Change on derivatives designated as cash flow hedges, net of tax of $0.2	(0.6)					(0.6)
Foreign currency translation adjustments	(1.9)					(1.9)
Net (loss) income	(26.2)				(26.2)
Ending Balance (in shares) at Jun. 30, 2018		122,726,673	12,756,672
Ending Balance at Jun. 30, 2018	$ 23.7	$ 1.2	$ (62.5)	$ 359.8	$ (270.7)	$ (4.1)