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Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred income tax assets:
Loss carryforwards	$ 145.4	$ 31.7
Capitalized research and development	131.9	161.3
Deferred revenue	81.9	155.6
Tax credits	62.1	55.8
Stock compensation	56.6	60.1
Other	4.4	8.3
Total deferred income tax assets	482.3	472.8
Deferred income tax liabilities:
Property, equipment and leasehold improvements	(0.9)	(1.4)
Total deferred income tax liabilities	(0.9)	(1.4)
Less valuation allowance	(481.4)	(471.4)
Net deferred income tax liability	$ 0.0	$ 0.0

X

- Definition

Amount of deferred tax liability attributable to taxable temporary differences.

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