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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, 2017
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Shares Under Option, Beginning balance | shares 10.3
Shares Under Option, Granted | shares 1.6
Shares Under Option, Exercised | shares (1.2)
Shares Under Option, Forfeited or canceled | shares 0.0
Shares Under Option, Ending balance | shares 10.7
Shares Under Option, Exercisable at end of period | shares 2.7
Shares Under Option, Ending vested and expected to vest | shares 10.5
Weighted Average Exercise Price, Beginning balance | $ / shares $ 41.40
Weighted Average Exercise Price, Granted | $ / shares 56.85
Weighted Average Exercise Price, Exercised | $ / shares 32.58
Weighted Average Exercise Price, Forfeited or canceled | $ / shares 0
Weighted Average Exercised Price, Ending balance | $ / shares 44.83
Weighted Average Exercise Price, Exercisable at end of period | $ / shares 37.76
Weighted Average Exercise price, Ending vested and expected to vest | $ / shares $ 44.75
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 1 month 27 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of period 1 year 11 months 23 days
Weighted Average Remaining Contractual Term (in years), Ending vested and expected to vest 4 years 1 month 16 days
Aggregate Intrinsic Value, Ending Balance | $ $ 179.4
Aggregate Intrinsic Value, Exercisable at end of period | $ 63.7
Aggregate Intrinsic Value, Ending vested and expected to vest | $ $ 177.0