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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, 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 (1.0)
Shares Under Option, Forfeited or canceled | shares (0.2)
Shares Under Option, Ending balance | shares 9.6
Shares Under Option, Exercisable at end of year | shares 2.7
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 36.37
Weighted Average Exercise Price, Forfeited or canceled | $ / shares 48.73
Weighted Average Exercised Price, Ending balance | $ / shares 49.49
Weighted Average Exercise Price, Exercisable at end of year | $ / shares 42.22
Weighted Average Exercise price, Ending vested and expected to vest | $ / shares $ 52.05
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 2 months 12 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 2 months 16 days
Weighted Average Remaining Contractual Term (in years), Ending vested and expected to vest 4 years 11 months 12 days
Aggregate Intrinsic Value, Ending Balance | $ $ 158.2
Aggregate Intrinsic Value, Exercisable at end of year | $ 62.8
Aggregate Intrinsic Value, Ending vested and expected to vest | $ $ 93.8