CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income
Beginning balance (in shares) at Dec. 31, 2022		69,275,030
Beginning balance at Dec. 31, 2022	$ 866.8	$ 0.0	$ 1,754.1	$ (859.7)	$ (27.6)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options and distribution of restricted stock units (in shares)		174,318
Exercise of stock options and distribution of restricted stock units	0.1		0.1
Stock-based compensation	15.4		15.4
Net loss	(65.8)			(65.8)
Other comprehensive income (loss)	5.3				5.3
Ending balance (in shares) at Mar. 31, 2023		69,449,348
Ending balance at Mar. 31, 2023	821.8	$ 0.0	1,769.6	(925.5)	(22.3)
Beginning balance (in shares) at Dec. 31, 2022		69,275,030
Beginning balance at Dec. 31, 2022	866.8	$ 0.0	1,754.1	(859.7)	(27.6)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Net loss	(194.5)
Ending balance (in shares) at Sep. 30, 2023		69,909,356
Ending balance at Sep. 30, 2023	726.9	$ 0.0	1,800.2	(1,054.2)	(19.1)
Beginning balance (in shares) at Mar. 31, 2023		69,449,348
Beginning balance at Mar. 31, 2023	821.8	$ 0.0	1,769.6	(925.5)	(22.3)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options and distribution of restricted stock units (in shares)		218,828
Exercise of stock options and distribution of restricted stock units	0.3		0.3
Stock-based compensation	14.8		14.8
Net loss	(67.2)			(67.2)
Other comprehensive income (loss)	1.3				1.3
Ending balance (in shares) at Jun. 30, 2023		69,668,176
Ending balance at Jun. 30, 2023	771.0	$ 0.0	1,784.7	(992.7)	(21.0)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options and distribution of restricted stock units (in shares)		241,180
Exercise of stock options and distribution of restricted stock units	0.1		0.1
Stock-based compensation	15.4		15.4
Net loss	(61.5)			(61.5)
Other comprehensive income (loss)	1.9				1.9
Ending balance (in shares) at Sep. 30, 2023		69,909,356
Ending balance at Sep. 30, 2023	$ 726.9	$ 0.0	1,800.2	(1,054.2)	(19.1)
Beginning balance (in shares) at Dec. 31, 2023	70,163,703	70,163,703
Beginning balance at Dec. 31, 2023	$ 708.9	$ 0.0	1,814.5	(1,096.6)	(9.0)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options and distribution of restricted stock units (in shares)		314,385
Exercise of stock options and distribution of restricted stock units	0.1		0.1
Stock-based compensation	14.9		14.9
Net loss	(47.3)			(47.3)
Other comprehensive income (loss)	(0.2)				(0.2)
Ending balance (in shares) at Mar. 31, 2024		70,478,088
Ending balance at Mar. 31, 2024	$ 676.4	$ 0.0	1,829.5	(1,143.9)	(9.2)
Beginning balance (in shares) at Dec. 31, 2023	70,163,703	70,163,703
Beginning balance at Dec. 31, 2023	$ 708.9	$ 0.0	1,814.5	(1,096.6)	(9.0)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Net loss	$ (172.2)
Ending balance (in shares) at Sep. 30, 2024	71,378,678	71,378,678
Ending balance at Sep. 30, 2024	$ 593.0	$ 0.0	1,861.9	(1,268.8)	(0.1)
Beginning balance (in shares) at Mar. 31, 2024		70,478,088
Beginning balance at Mar. 31, 2024	676.4	$ 0.0	1,829.5	(1,143.9)	(9.2)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options and distribution of restricted stock units (in shares)		343,693
Exercise of stock options and distribution of restricted stock units	$ 0.0		0.0
Exercise of warrant shares (in shares)	181,081
Stock-based compensation	$ 15.4		15.4
Net loss	(57.2)			(57.2)
Other comprehensive income (loss)	0.6				0.6
Ending balance (in shares) at Jun. 30, 2024		71,002,862
Ending balance at Jun. 30, 2024	635.2	$ 0.0	1,844.9	(1,201.1)	(8.6)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options and distribution of restricted stock units (in shares)		375,816
Exercise of stock options and distribution of restricted stock units	0.1		0.1
Stock-based compensation	16.9		16.9
Net loss	(67.7)			(67.7)
Other comprehensive income (loss)	$ 8.5				8.5
Ending balance (in shares) at Sep. 30, 2024	71,378,678	71,378,678
Ending balance at Sep. 30, 2024	$ 593.0	$ 0.0	$ 1,861.9	$ (1,268.8)	$ (0.1)