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Income Taxes - Schedule Of Deferred Tax Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Share-based compensation expense | $ 95.6 | $ 87.2
Expenses deducted in later years for tax purposes | 42.0 | 29.1
Intangible assets | 362.3 | 351.9
Research and other credits | 56.1 | 40.1
Other | 10.4 | 9.0
Gross deferred tax assets | 566.4 | 517.3
Valuation allowance | (57.2) | (42.3)
Deferred tax assets | 509.2 | 475.0
Deferred tax liabilities: |  |
Fixed assets | (75.3) | (42.2)
Intangible assets | (8.3) | (7.5)
Other | 0.0 | (0.1)
Deferred tax liabilities | 83.6 | 49.8
Net deferred tax assets | $ 425.6 | $ 425.2

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