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Stock Option Plans - Stock Option Activity and Related Information (Detail)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Shares Under Option, Beginning balance | shares 8.8
Shares Under Option, Granted | shares 1.3
Shares Under Option, Exercised | shares (0.7)
Shares Under Option, Forfeited or canceled | shares (0.1)
Shares Under Option, Ending balance | shares 9.3
Shares Under Option, Exercisable at end of year | shares 3.2
Shares Under Option, Ending unvested and expected to vest | shares 5.8
Weighted Average Exercise Price, Beginning balance | $ / shares $ 50.16
Weighted Average Exercise Price, Granted | $ / shares 79.59
Weighted Average Exercise Price, Exercised | $ / shares 41.11
Weighted Average Exercise Price, Forfeited or canceled | $ / shares 51.52
Weighted Average Exercise Price, Ending balance | $ / shares 54.92
Weighted Average Exercise Price, Exercisable at end of year | $ / shares 44.68
Weighted Average Exercise Price, Ending unvested and expected to vest | $ / shares $ 59.61
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 2 months 26 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 5 months 19 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 5 years 1 month 6 days
Aggregate Intrinsic Value, Ending Balance | $ $ 217.2
Aggregate Intrinsic Value, Exercisable at end of year | $ 106.2
Aggregate Intrinsic Value, Ending unvested and expected to vest | $ $ 108.6