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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating losses $ 90.3 $ 111.4
Research and development credits 129.7 109.6
Capitalized research and development 17.9 24.7
Share-based compensation expense 38.9 29.8
Operating lease assets 29.3 25.2
Intangible assets 86.1 86.7
Other 21.6 23.9
Total deferred tax assets 413.8 411.3
Deferred tax liabilities:    
Convertible senior notes (9.9) (13.8)
Operating lease liabilities (23.3) (19.9)
Other (10.7) (8.4)
Total deferred tax liabilities (43.9) (42.1)
Net of deferred tax assets and liabilities 369.9 369.2
Valuation allowance (54.8) (49.8)
Net deferred tax assets $ 315.1 $ 319.4