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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 36.4 | $ 27.4
Research and development credits | 55.3 | 108.9
Capitalized research and development | 178.7 | 91.1
Stock-based compensation expense | 52.7 | 45.9
Operating lease assets | 72.0 | 26.8
Intangible assets | 110.0 | 80.7
Other | 25.0 | 24.9
Total deferred tax assets | 530.1 | 405.7
Deferred tax liabilities: |  |
Operating lease liabilities | (66.3) | (21.0)
Other | (12.3) | (11.8)
Total deferred tax liabilities | (78.6) | (32.8)
Net of deferred tax assets and liabilities | 451.5 | 372.9
Valuation allowance | (88.9) | (67.0)
Net deferred tax assets | $ 362.6 | $ 305.9

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