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Income Taxes - Schedule of Reconciliation between Effective Tax Rate and Statutory Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. federal statutory tax rate	$ 149.2	$ 82.1	$ 53.9
State income tax, net of federal benefit	7.8	5.4	8.9
Permanent items	(2.7)	0.6	5.2
Research and development credits	(28.3)	(23.3)	(28.9)
Foreign tax credit	0.0	0.0	(3.7)
Foreign rate differential	15.8	27.7	20.9
Stock and officers compensation	5.6	(1.2)	(20.4)
Collaboration agreement milestone share-based payment	(72.1)	(52.9)	0.0
Change in statutory tax rates	19.4	1.0	(10.0)
Intellectual property transfer	63.9	0.0	0.0
Other	0.3	1.3	(0.4)
Change in valuation allowance	10.0	8.9	14.4
Income taxes at effective rates	$ 168.9	$ 49.6	$ 39.9

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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