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Stock Option Plans - Stock Option Activity and Related Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Shares Under Option, Beginning balance 7.9
Shares Under Option, Granted 1.6
Shares Under Option, Exercised (0.9)
Shares Under Option, Forfeited or canceled (0.1)
Shares Under Option, Ending balance 8.5
Shares Under Option, Exercisable at end of year 2.9
Shares Under Option, Ending unvested and expected to vest 5.3
Weighted Average Exercise Price, Beginning balance $ 56.40
Weighted Average Exercise Price, Granted 86.17
Weighted Average Exercise Price, Exercised 44.95
Weighted Average Exercise Price, Forfeited or canceled 63.26
Weighted Average Exercise Price, Ending balance 63.12
Weighted Average Exercise Price, Exercisable at end of year 46.99
Weighted Average Exercise Price, Ending unvested and expected to vest $ 70.67
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 29 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 1 month 13 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 5 years 3 days
Aggregate Intrinsic Value, Ending Balance $ 291.1
Aggregate Intrinsic Value, Exercisable at end of year 144.0
Aggregate Intrinsic Value, Ending unvested and expected to vest $ 140.8