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Stock Option Plans - Stock Option Activity and Related Information (Detail)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Jun. 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 1.7
Shares Under Option, Exercised | shares (1.0)
Shares Under Option, Forfeited or canceled | shares 0.0
Shares Under Option, Ending balance | shares 11.0
Shares Under Option, Exercisable at end of period | shares 2.9
Shares Under Option, Ending vested and expected to vest | shares 10.7
Weighted Average Exercise Price, Beginning balance | $ / shares $ 41.40
Weighted Average Exercise Price, Granted | $ / shares 56.85
Weighted Average Exercise Price, Exercised | $ / shares 32.06
Weighted Average Exercise Price, Forfeited or canceled | $ / shares 0
Weighted Average Exercised Price, Ending balance | $ / shares 44.62
Weighted Average Exercise Price, Exercisable at end of period | $ / shares 37.54
Weighted Average Exercise price, Ending vested and expected to vest | $ / shares $ 44.54
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 4 months 6 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of period 2 years 2 months 8 days
Weighted Average Remaining Contractual Term (in years), Ending vested and expected to vest 4 years 3 months 29 days
Aggregate Intrinsic Value, Ending Balance | $ $ 138.3
Aggregate Intrinsic Value, Exercisable at end of period | $ 57.2
Aggregate Intrinsic Value, Ending vested and expected to vest | $ $ 136.6