Maximum percentage of employees on stockholders to participate in employee stock purchase plan.

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Maximum percentage of payroll deduction under ESPP.

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Minimum exercise price of NSOs, percentage of fair value.

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Minimum hours employed per week to participate in employee stock purchase plan.

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Minimum months employed per year to participate in employee stock purchase plan.

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Offering Period, Employee Stock Purchase Plans

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Offering Period, Number of Purchase Periods Offering Divided Into, Employee Stock Purchase Plans

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Offering Period, Period Offering Divided Into, Employee Stock Purchase Plans

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Period of Look-Back That Could Cause Offering Period to Reset, Employee Stock Purchase Plans

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting Per Month After One Year

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting at the End of One Month

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Number

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Stock options granted initial vesting period.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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Discount rate from fair value on offering date that participants pay for shares.

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Discount rate from fair value on purchase date that participants pay for shares.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Percentage of vesting of award under share-based payment arrangement.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period Type:

Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) period $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016	Apr. 30, 2019 shares	Mar. 31, 2019 shares	Apr. 30, 2017 shares	Mar. 31, 2017 shares	Apr. 30, 2015 shares	Mar. 31, 2015 shares	Oct. 31, 2009 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised under stock option plans \| $	$ 512.0	$ 526.6	$ 379.9
Cash received from option exercises and employee stock purchase plans \| $	$ 272.8	236.6	415.5
Number of options vested and expected to vest	5,200,000
Weighted average remaining contractual life of shares vested and expected to vest, years	5 years 2 months 12 days
Aggregate intrinsic value of shares vested and expected to vest \| $	$ 1,833.1
Options vested and expected to vest, weighted-average exercise price per share \| $ / shares	$ 241.65
Share-based compensation charges, income tax effect \| $	$ 70.2	54.3	49.2
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options \| $	109.7
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense \| $	$ 493.6
Weighted average period unrecognized compensation expenses are expected to be recognized, years	2 years 2 months 12 days
Expected to vest (in shares)	1,700,000
Aggregate intrinsic value \| $	$ 1,032.0
Canceled (shares)	100,000
Vested in period, aggregate fair value \| $	$ 433.2	$ 334.3	$ 144.2
Restricted Stock Units (RSUs) \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share based vesting period	4 years
Annual Grant Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon six months of service	12.50%
Percentage vesting per month after six months of service	2.0833%
Annual Grant Options \| February Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon six months of service	12.50%
Percentage vesting per month after six months of service	2.0833%
Annual Grant Options \| August Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting at the end of one month	14.5833%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	2.0833%
New Hire Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon one year of service	25.00%
Percentage vesting per month after one year	2.0833%
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares were reserved for future issuance (shares)	1,200,000
Minimum hours employed per week	20 hours
Minimum months employed per year	5 months
Maximum percentage of employees on stockholders to participate in ESPP	5.00%
Percentage of employee payroll deduction under the stock plan, maximum	15.00%
Duration for each offering period	24 months
Number of shorter purchase periods that each offering period is divided into \| period	4
Duration of each shorter offering period	6 months
Discount on fair market value on the offering date	85.00%
Discount on fair market value on the purchase date	85.00%
Period of look-back that could cause offering period to reset	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant							7,590,315	6,090,315
Employee stock purchase plan, shares issued	200,000	200,000	200,000
Employee stock purchase plan, value of shares issued \| $	$ 56.4	$ 46.8	$ 38.3
Total unrecognized compensation expense \| $	$ 31.4
Weighted average period unrecognized compensation expenses are expected to be recognized, years	1 year 4 months 24 days
Nonvested Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense \| $	$ 110.1
Weighted average period unrecognized compensation expenses are expected to be recognized, years	2 years 6 months
Initial RSU grants \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		33.3333%
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Number of shares of common stock reserved for issuance (shares)					28,450,000	24,450,000
Shares were reserved for future issuance (shares)	5,900,000
2010 Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares were reserved for future issuance (shares)	2,600,000
2010 Plan \| Annual Grant Options \| February Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period	4 years
2010 Plan \| Annual Grant Options \| August Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period	3 years 6 months
2009 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Number of shares of common stock reserved for issuance (shares)									4,365,000	3,465,000
2000 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Minimum exercise price of NSOs, percentage of fair value	85.00%
2000 Non-Employee Directors' Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, options, expiration term (in years)	10 years
Number of shares of common stock reserved for issuance (shares)											450,000
Shares were reserved for future issuance (shares)	100,000
2000 Non-Employee Directors' Stock Option Plan \| Annual Grant Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period				1 year
2000 Non-Employee Directors' Stock Option Plan \| Initial Grant Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage vesting upon one year of service		33.3333%
Percentage vesting per month after one year		2.7778%
Stock options granted initial vesting period, years				3 years