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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating losses $ 111.4 $ 181.3
Research and development credits 109.6 71.9
Capitalized research and development 24.7 28.0
Share-based compensation expense 29.8 22.9
Operating lease assets 25.2 23.3
Intangible assets 86.7 49.3
Other 23.9 18.5
Total deferred tax assets 411.3 395.2
Deferred tax liabilities:    
Convertible senior notes (13.8) (24.1)
Operating lease liabilities (19.9) (18.2)
Other (8.4) (6.9)
Total deferred tax liabilities (42.1) (49.2)
Net of deferred tax assets and liabilities 369.2 346.0
Valuation allowance (49.8) (346.0)
Net deferred tax assets $ 319.4 $ 0.0