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Income Taxes - Schedule Of Deferred Tax Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 27.7 | $ 5.1
Share-based compensation expense | 101.1 | 95.6
Lease liabilities | 12.0 | 17.0
Expenses deducted in later years for tax purposes | 29.3 | 25.0
Intangible assets | 321.8 | 362.3
Research and other credits | 76.3 | 56.1
Other | 0.0 | 5.3
Gross deferred tax assets | 568.2 | 566.4
Valuation allowance | (81.4) | (57.2)
Deferred tax assets | 486.8 | 509.2
Deferred tax liabilities: |  |
Fixed assets | (91.1) | (58.3)
Right-of-use assets | (8.4) | (17.0)
Intangible assets | (10.1) | (8.3)
Other | (13.2) | 0.0
Deferred tax liabilities | 122.8 | 83.6
Net deferred tax assets | $ 364.0 | $ 425.6

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