Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	(Accumulated Deficit) Retained Earnings
Beginning balance (in shares) at Dec. 31, 2023		57.8
Beginning balance at Dec. 31, 2023	$ 649.3	$ 0.1	$ (227.7)	$ 904.4	$ (5.7)	$ (21.8)
Beginning balance (in shares) at Dec. 31, 2023			(5.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9.0					9.0
Share-based compensation activity (in shares)		0.2
Share-based compensation activity	5.4			5.4
Other comprehensive income (loss), net of tax	0.2				0.2
Ending balance (in shares) at Mar. 31, 2024		58.0
Ending balance at Mar. 31, 2024	$ 663.9	$ 0.1	$ (227.7)	909.8	(5.5)	(12.8)
Ending balance (in shares) at Mar. 31, 2024			(5.6)
Beginning balance (in shares) at Dec. 31, 2024	59.9	59.9
Beginning balance at Dec. 31, 2024	$ 482.8	$ 0.1	$ (227.7)	928.0	(5.2)	(212.4)
Beginning balance (in shares) at Dec. 31, 2024	(5.6)		(5.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 68.0					68.0
Share-based compensation activity (in shares)		0.2
Share-based compensation activity	2.8			2.8
Other comprehensive income (loss), net of tax	$ (0.9)				(0.9)
Ending balance (in shares) at Mar. 31, 2025	60.1	60.1
Ending balance at Mar. 31, 2025	$ 552.7	$ 0.1	$ (227.7)	$ 930.8	$ (6.1)	$ (144.4)
Ending balance (in shares) at Mar. 31, 2025	(5.6)		(5.6)