CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - UNAUDITED - USD ($) shares in Millions, $ in Millions	Total	Class A Shares	Class B Shares	Class A and Class B Convertible Common Stock	Class A and Class B Convertible Common Stock Class A Shares	Class A and Class B Convertible Common Stock Class B Shares	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Loss
Beginning balance (in shares) at Dec. 31, 2023	14.1
Beginning balance at Dec. 31, 2023	$ 112.0
Ending balance (in shares) at Mar. 31, 2024	14.1
Ending balance at Mar. 31, 2024	$ 112.0
Beginning balance (in shares) at Dec. 31, 2023					9.5	5.0
Beginning balance at Dec. 31, 2023	165.7			$ 0.0			$ 1,883.4	$ (2.5)	$ (1,715.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(6.2)								(6.2)
Other comprehensive income (loss)	(0.8)							(0.8)
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes (in shares)					0.1
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes	0.0
Common stock—share-based compensation expense	4.6						4.6
Warrant compensation expense	2.8						2.8
Warrant issuance costs	(0.4)						(0.4)
Ending balance (in shares) at Mar. 31, 2024			5.0		9.6
Ending balance at Mar. 31, 2024	$ 165.7			0.0			1,890.4	(3.3)	(1,721.4)
Beginning balance (in shares) at Dec. 31, 2024	14.1
Beginning balance at Dec. 31, 2024	$ 112.0
Ending balance (in shares) at Mar. 31, 2025	14.1
Ending balance at Mar. 31, 2025	$ 112.0
Beginning balance (in shares) at Dec. 31, 2024		11.1	4.0		11.1	4.0
Beginning balance at Dec. 31, 2024	203.7			0.0			1,887.9	(2.3)	(1,681.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	18.4								18.4
Other comprehensive income (loss)	3.0							3.0
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes (in shares)					0.1
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes	(2.8)						(2.8)
Common stock—share-based compensation expense	6.4						6.4
Ending balance (in shares) at Mar. 31, 2025		11.2	4.0		11.2	4.0
Ending balance at Mar. 31, 2025	$ 228.7			$ 0.0			$ 1,891.5	$ 0.7	$ (1,663.5)