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, 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)	81,776	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	61,758,739
Ending balance at Mar. 31, 2022	$ 912.7	$ 0.0	$ 1,568.2	$ (636.7)	$ (18.8)