CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Millions	Common Stock	Treasury Stock at Cost, Common	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Income (Deficit)	Total
Balances at beginning of period at Dec. 31, 2020	$ 1.0	$ (80.7)	$ 333.8	$ (6.5)	$ (460.0)	$ (212.4)
Balances at beginning of period (in shares) at Dec. 31, 2020	86,847,797
Increase (Decrease) in Stockholders' Deficit
Changes in accumulated other comprehensive gain (loss)				4.3		4.3
Stock-based compensation			3.1			3.1
Issuance of restricted stock, net (in shares)	666,127
Purchase of shares		(6.6)				(6.6)
Purchase of shares (in shares)	(397,186)
Net income (loss)					9.6	9.6
Balances at end of period at Mar. 31, 2021	$ 1.0	(87.3)	336.9	(2.2)	(450.4)	(202.0)
Balances at end of period (in shares) at Mar. 31, 2021	87,116,738
Balances at beginning of period at Dec. 31, 2020	$ 1.0	(80.7)	333.8	(6.5)	(460.0)	(212.4)
Balances at beginning of period (in shares) at Dec. 31, 2020	86,847,797
Increase (Decrease) in Stockholders' Deficit
Net income (loss)						539.9
Balances at end of period at Sep. 30, 2021	$ 1.0	(88.7)	345.0		79.9	337.2
Balances at end of period (in shares) at Sep. 30, 2021	87,191,153
Balances at beginning of period at Mar. 31, 2021	$ 1.0	(87.3)	336.9	(2.2)	(450.4)	(202.0)
Balances at beginning of period (in shares) at Mar. 31, 2021	87,116,738
Increase (Decrease) in Stockholders' Deficit
Changes in accumulated other comprehensive gain (loss)				$ 2.2		2.2
Stock-based compensation			4.0			4.0
Issuance of restricted stock, net (in shares)	34,929
Purchase of shares		(0.8)				(0.8)
Purchase of shares (in shares)	(40,473)
Net income (loss)					12.4	12.4
Balances at end of period at Jun. 30, 2021	$ 1.0	(88.1)	340.9		(438.0)	(184.2)
Balances at end of period (in shares) at Jun. 30, 2021	87,111,194
Increase (Decrease) in Stockholders' Deficit
Stock-based compensation			4.1			4.1
Issuance of restricted stock, net (in shares)	106,642
Purchase of shares		(0.6)				(0.6)
Purchase of shares (in shares)	(26,683)
Net income (loss)					517.9	517.9
Balances at end of period at Sep. 30, 2021	$ 1.0	(88.7)	345.0		79.9	337.2
Balances at end of period (in shares) at Sep. 30, 2021	87,191,153
Balances at beginning of period at Dec. 31, 2021	$ 1.0	(89.2)	348.5		310.5	$ 570.8
Balances at beginning of period (in shares) at Dec. 31, 2021	87,392,088					87,392,088
Increase (Decrease) in Stockholders' Deficit
Stock-based compensation			5.6			$ 5.6
Issuance of restricted stock, net (in shares)	704,864
Purchase of shares		(5.3)				(5.3)
Purchase of shares (in shares)	(298,386)
Net income (loss)					5.7	5.7
Balances at end of period at Mar. 31, 2022	$ 1.0	(94.5)	354.1		316.2	576.8
Balances at end of period (in shares) at Mar. 31, 2022	87,798,566
Balances at beginning of period at Dec. 31, 2021	$ 1.0	(89.2)	348.5		310.5	$ 570.8
Balances at beginning of period (in shares) at Dec. 31, 2021	87,392,088					87,392,088
Increase (Decrease) in Stockholders' Deficit
Net income (loss)						$ 10.2
Balances at end of period at Sep. 30, 2022	$ 1.0	(96.2)	367.5		320.7	$ 593.0
Balances at end of period (in shares) at Sep. 30, 2022	87,670,327					87,670,327
Balances at beginning of period at Mar. 31, 2022	$ 1.0	(94.5)	354.1		316.2	$ 576.8
Balances at beginning of period (in shares) at Mar. 31, 2022	87,798,566
Increase (Decrease) in Stockholders' Deficit
Stock-based compensation			6.3			6.3
Issuance of restricted stock, net (in shares)	(31,332)
Purchase of shares		(0.7)				(0.7)
Purchase of shares (in shares)	(35,149)
Net income (loss)					4.0	4.0
Balances at end of period at Jun. 30, 2022	$ 1.0	(95.2)	360.4		320.2	586.4
Balances at end of period (in shares) at Jun. 30, 2022	87,732,085
Increase (Decrease) in Stockholders' Deficit
Stock-based compensation			7.1			7.1
Issuance of restricted stock, net (in shares)	(5,476)
Purchase of shares		(1.0)				(1.0)
Purchase of shares (in shares)	(56,282)
Net income (loss)					0.5	0.5
Balances at end of period at Sep. 30, 2022	$ 1.0	$ (96.2)	$ 367.5		$ 320.7	$ 593.0
Balances at end of period (in shares) at Sep. 30, 2022	87,670,327					87,670,327