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Income Taxes - Schedule Of Deferred Tax Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Share-based compensation expense $ 79.1 $ 122.2
Expenses deducted in later years for tax purposes 29.7 47.4
Research and other credits 27.5 15.6
Other 10.5 9.8
Gross deferred tax assets 146.8 195.0
Valuation allowance (29.4) (17.2)
Deferred tax assets 117.4 177.8
Deferred tax liabilities:    
Fixed assets (26.3) (25.2)
Intangible assets (3.6) (2.3)
Other (0.2) (0.2)
Deferred tax liabilities (30.1) (27.7)
Net deferred tax assets $ 87.3 $ 150.1