Income Taxes - Summary of Deferred Income Tax Benefits and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
Loss carryforwards	$ 97.0	$ 43.1
Tax credits	18.8	10.1
Stock compensation	15.4	5.0
Deferred revenue	10.0	9.0
Other	3.3	0.1
Total deferred income tax assets	144.5	67.3
Deferred income tax liabilities:
Property, equipment and leasehold improvements	(3.6)	(2.4)
Other	(1.4)	0.0
Total deferred income tax liabilities	(5.0)	(2.4)
Less valuation allowance	(139.5)	(64.9)
Net deferred income tax liability	$ 0.0	$ 0.0