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Stock Option Plans - Stock Option Activity and Related Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Shares Under Option, Beginning balance 9.5 9.5
Shares Under Option, Granted 1.3 1.7
Shares Under Option, Exercised (1.6) (1.3)
Shares Under Option, Forfeited or canceled (0.4) (0.4)
Shares Under Option, Ending balance 8.8 9.5
Shares Under Option, Exercisable at end of year 2.1 2.1
Shares Under Option, Ending unvested and expected to vest 6.5 7.2
Weighted Average Exercise Price, Beginning balance $ 45.27 $ 41.45
Weighted Average Exercise Price, Granted 70.74 56.87
Weighted Average Exercise Price, Exercised 37.85 33.11
Weighted Average Exercise Price, Forfeited or canceled 49.23 44.48
Weighted Average Exercise Price, Ending balance 50.16 45.27
Weighted Average Exercise Price, Exercisable at end of year 42.84 37.81
Weighted Average Exercise Price, Ending unvested and expected to vest $ 52.14 $ 47.30
Weighted Average Remaining Contractual Term (in years), Ending balance 3 years 10 months 9 days 3 years 4 months 20 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 1 year 9 months 29 days 1 year 9 months
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 4 years 5 months 15 days 4 years 7 months 20 days
Aggregate Intrinsic Value, Ending Balance $ 206.8 $ 171.5
Aggregate Intrinsic Value, Exercisable at end of year 64.4 52.7
Aggregate Intrinsic Value, Ending unvested and expected to vest $ 140.3 $ 115.8