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Employee Benefit Plans and Stockholders' Equity - Schedule of Restricted Stock Units Activity (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning nonvested balance, shares	2.7
Ending nonvested balance, shares	2.7	2.7
Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic Value, Nonvested	$ 319.0	$ 154.5	$ 218.6
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning nonvested balance, shares	2.7	3.7	4.1
Beginning Nonvested Balance	$ 70.68	$ 62.51	$ 50.60
Granted, shares	1.7	1.3	1.9
Granted	$ 66.07	$ 75.78	$ 68.16
Vested, shares	(1.4)	(1.9)	(2.1)
Vested	$ 68.44	$ 58.92	$ 44.95
Forfeited, shares	(0.3)	(0.4)	(0.2)
Forfeited	$ 68.56	$ 67.97	$ 56.37
Ending nonvested balance, shares	2.7	2.7	3.7
Ending Nonvested Balance	$ 69.19	$ 70.68	$ 62.51
Maximum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	4 years

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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