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

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- Definition

Maximum percentage of payroll deduction under ESPP.

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No definition available.

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- Definition

Minimum exercise price of NSOs, percentage of fair value.

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No definition available.

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- Definition

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

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No definition available.

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

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- Definition

Offering Period, Employee Stock Purchase Plans

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No definition available.

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

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No definition available.

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

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No definition available.

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

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No definition available.

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- Definition

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

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting Per Month After Six Months of Service

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting Upon One Year of Service

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting Upon Six Months of Service

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No definition available.

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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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No definition available.

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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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No definition available.

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- Definition

Stock options granted initial vesting period.

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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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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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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- Definition

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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- Definition

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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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. 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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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 share-based compensation awards.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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No definition available.

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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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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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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Number of shares issued during the period as a result of an employee stock purchase plan.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) period $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) 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 \| $	$ 526.6	$ 379.9	$ 273.3
Cash received from option exercises and employee stock purchase plans \| $	$ 236.6	415.5	580.9
Number of options vested and expected to vest	6,100,000
Weighted average remaining contractual life of shares vested and expected to vest, years	5 years 4 months
Aggregate intrinsic value of shares vested and expected to vest \| $	$ 1,715.2
Options vested and expected to vest, weighted-average exercise price per share \| $ / shares	$ 197.45
Share-based compensation charges, income tax effect \| $	$ 54.3	49.2	56.1
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options \| $	87.0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense \| $	$ 373.5
Weighted average period unrecognized compensation expenses are expected to be recognized, years	2 years 2 months
Expected to vest (in shares)	1,800,000
Aggregate intrinsic value \| $	$ 879.4
Canceled (shares)	100,000
Vested in period, aggregate fair value \| $	$ 334.3	$ 144.2	$ 65.3
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
Restricted Stock Units (RSUs) \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting period	1 year
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)	1,400,000
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 \| $	$ 46.8	$ 38.3	$ 32.5
Total unrecognized compensation expense \| $	$ 11.6
Weighted average period unrecognized compensation expenses are expected to be recognized, years	11 months
Nonvested Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense \| $	$ 91.6
Weighted average period unrecognized compensation expenses are expected to be recognized, years	2 years 3 months 18 days
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%
Share based vesting period		3 years
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)				24,450,000	21,150,000
Shares were reserved for future issuance (shares)	4,100,000
2010 Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares were reserved for future issuance (shares)	1,800,000
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
Shares were reserved for future issuance (shares)	102,000
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