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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 50.5 | $ 36.5
Research and development credits | 62.8 | 55.3
Capitalized research and development | 255.7 | 178.7
Stock-based compensation expense | 61.4 | 52.7
Operating lease assets | 122.7 | 72.0
Intangible assets | 121.4 | 110.0
Other | 51.7 | 37.2
Total deferred tax assets | 726.2 | 542.4
Deferred tax liabilities: |  |
Operating lease liabilities | (112.8) | (66.3)
Other | (15.5) | (24.6)
Total deferred tax liabilities | (128.3) | (90.9)
Net of deferred tax assets and liabilities | 597.9 | 451.5
Valuation allowance | (112.2) | (88.9)
Net deferred tax assets | $ 485.7 | $ 362.6

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