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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Net operating losses $ 27.4 $ 90.3
Research and development credits 108.9 129.7
Capitalized research and development 91.1 17.9
Stock-based compensation expense 45.9 38.9
Operating lease assets 26.8 29.3
Intangible assets 80.7 86.1
Other 24.9 21.6
Total deferred tax assets 405.7 413.8
Deferred tax liabilities:    
Convertible senior notes 0.0 (9.9)
Operating lease liabilities (21.0) (23.3)
Other (11.8) (10.7)
Total deferred tax liabilities (32.8) (43.9)
Net of deferred tax assets and liabilities 372.9 369.9
Valuation allowance (67.0) (54.8)
Net deferred tax assets $ 305.9 $ 315.1