CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Millions		Common Stock		Treasury Stock at Cost	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Balances at beginning of period at Dec. 31, 2018		$ 0.9		$ (78.1)	$ 312.7	$ (6.5)	$ (510.8)	$ (281.8)
Balances at beginning of period (in shares) at Dec. 31, 2018		82,680,380
Increase (Decrease) in Stockholders' Deficit
Changes in accumulated other comprehensive gain (loss)						(9.0)		(9.0)
Stock-based compensation					10.1			10.1
Issuance of restricted stock, net (in shares)		1,609,514
Purchase of shares				(1.6)				(1.6)
Purchase of shares (in shares)		(186,786)
Net income (loss)							36.4	36.4
Balances at end of period at Dec. 31, 2019	[1]	$ 0.9		(79.7)	322.8	(15.5)	(474.4)	(245.9)
Balances at end of period (in shares) at Dec. 31, 2019	[1]	84,103,108
Increase (Decrease) in Stockholders' Deficit
Changes in accumulated other comprehensive gain (loss)						9.0		9.0
Stock-based compensation		$ 0.1			11.0			11.1
Issuance of restricted stock, net (in shares)		3,004,954
Purchase of shares				(1.0)				(1.0)
Purchase of shares (in shares)		(260,265)
Net income (loss)							14.4	14.4
Balances at end of period at Dec. 31, 2020	[1]	$ 1.0		(80.7)	333.8	(6.5)	(460.0)	$ (212.4)
Balances at end of period (in shares) at Dec. 31, 2020		86,847,797	[1]					86,847,797
Increase (Decrease) in Stockholders' Deficit
Changes in accumulated other comprehensive gain (loss)						$ 6.5		$ 6.5
Stock-based compensation					14.7			14.7
Issuance of restricted stock, net (in shares)		1,038,749
Purchase of shares				(8.5)				(8.5)
Purchase of shares (in shares)		(494,458)
Net income (loss)							770.5	770.5
Balances at end of period at Dec. 31, 2021	[1]	$ 1.0		$ (89.2)	$ 348.5		$ 310.5	$ 570.8
Balances at end of period (in shares) at Dec. 31, 2021		87,392,088	[1]					87,392,088

[1] Included in outstanding shares as of December 31, 2021, 2020 and 2019 are 4,325,124, 4,990,971 and 3,140,168, respectively, of non-vested shares of restricted stock awards granted to employees and directors.