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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