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Stock Option Plans - Stock Option Activity and Related Information (Detail)
$ / shares in Units, shares in Millions, $ in Millions
 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Shares Under Option, Beginning balance | shares 9.5
Shares Under Option, Granted | shares 1.3
Shares Under Option, Exercised | shares (1.4)
Shares Under Option, Forfeited or canceled | shares (0.3)
Shares Under Option, Ending balance | shares 9.1
Shares Under Option, Exercisable at end of year | shares 2.3
Shares Under Option, Ending vested and expected to vest | shares 6.6
Weighted Average Exercise Price, Beginning balance | $ / shares $ 45.27
Weighted Average Exercise Price, Granted | $ / shares 70.74
Weighted Average Exercise Price, Exercised | $ / shares 37.55
Weighted Average Exercise Price, Forfeited or canceled | $ / shares 49.10
Weighted Average Exercised Price, Ending balance | $ / shares 49.93
Weighted Average Exercise Price, Exercisable at end of year | $ / shares 42.59
Weighted Average Exercise price, Ending vested and expected to vest | $ / shares $ 52.10
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 18 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 7 days
Weighted Average Remaining Contractual Term (in years), Ending vested and expected to vest 4 years 8 months 12 days
Aggregate Intrinsic Value, Ending Balance | $ $ 221.8
Aggregate Intrinsic Value, Exercisable at end of year | $ 72.7
Aggregate Intrinsic Value, Ending vested and expected to vest | $ $ 146.5