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, 2020		56,774,294
Beginning balance at Dec. 31, 2020	$ 541.0	$ 0.0	$ 859.8	$ (320.6)	$ 1.8
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options (in shares)		577,162
Exercise of stock options	6.1		6.1
Issuance of common stock (in shares)		4,018,647
Issuance of common stock	640.3		640.3
Stock-based compensation	6.1		6.1
Net loss	(49.0)			(49.0)
Other comprehensive income (loss)	(0.8)				(0.8)
Ending balance (in shares) at Mar. 31, 2021		61,370,103
Ending balance at Mar. 31, 2021	1,143.7	$ 0.0	1,512.3	(369.6)	1.0
Beginning balance (in shares) at Dec. 31, 2020		56,774,294
Beginning balance at Dec. 31, 2020	541.0	$ 0.0	859.8	(320.6)	1.8
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Net loss	(104.6)
Ending balance (in shares) at Jun. 30, 2021		61,532,127
Ending balance at Jun. 30, 2021	1,101.6	$ 0.0	1,525.9	(425.2)	0.9
Beginning balance (in shares) at Mar. 31, 2021		61,370,103
Beginning balance at Mar. 31, 2021	1,143.7	$ 0.0	1,512.3	(369.6)	1.0
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options (in shares)		162,024
Exercise of stock options	1.7		1.7
Stock-based compensation	11.9		11.9
Net loss	(55.6)			(55.6)
Other comprehensive income (loss)	(0.1)				(0.1)
Ending balance (in shares) at Jun. 30, 2021		61,532,127
Ending balance at Jun. 30, 2021	$ 1,101.6	$ 0.0	1,525.9	(425.2)	0.9
Beginning balance (in shares) at Dec. 31, 2021	61,660,996	61,660,996
Beginning balance at Dec. 31, 2021	$ 988.2	$ 0.0	1,553.5	(561.9)	(3.4)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options (in shares)		97,743
Exercise of stock options	0.6		0.6
Stock-based compensation	14.1		14.1
Net loss	(74.8)			(74.8)
Other comprehensive income (loss)	(15.4)				(15.4)
Ending balance (in shares) at Mar. 31, 2022		61,758,739
Ending balance at Mar. 31, 2022	$ 912.7	$ 0.0	1,568.2	(636.7)	(18.8)
Beginning balance (in shares) at Dec. 31, 2021	61,660,996	61,660,996
Beginning balance at Dec. 31, 2021	$ 988.2	$ 0.0	1,553.5	(561.9)	(3.4)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options (in shares)	170,362
Net loss	$ (142.7)
Ending balance (in shares) at Jun. 30, 2022	61,867,577	61,867,577
Ending balance at Jun. 30, 2022	$ 849.1	$ 0.0	1,582.5	(704.6)	(28.8)
Beginning balance (in shares) at Mar. 31, 2022		61,758,739
Beginning balance at Mar. 31, 2022	912.7	$ 0.0	1,568.2	(636.7)	(18.8)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Exercise of stock options (in shares)		108,838
Exercise of stock options	0.4		0.4
Stock-based compensation	13.9		13.9
Net loss	(67.9)			(67.9)
Other comprehensive income (loss)	$ (10.0)				(10.0)
Ending balance (in shares) at Jun. 30, 2022	61,867,577	61,867,577
Ending balance at Jun. 30, 2022	$ 849.1	$ 0.0	$ 1,582.5	$ (704.6)	$ (28.8)