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Income Taxes - Schedule Of Deferred Tax Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Share-based compensation expense $ 87.2 $ 79.1
Expenses deducted in later years for tax purposes 29.1 29.7
Intangible assets 351.9 0.0
Research and other credits 40.1 27.5
Other 9.0 10.5
Gross deferred tax assets 517.3 146.8
Valuation allowance (42.3) (29.4)
Deferred tax assets 475.0 117.4
Deferred tax liabilities:    
Fixed assets (42.2) (26.3)
Intangible assets (7.5) (3.6)
Other (0.1) (15.5)
Deferred tax liabilities (49.8) (45.4)
Net deferred tax assets $ 425.2 $ 72.0