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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