Ordinary shares unissued under Deferred Compensation Plan

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Annual Automatic Additional Shares Authorization, Percentage of Outstanding Shares

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No definition available.

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- Definition

Number of purchase periods within a fixed offering period with respect to the plan.

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No definition available.

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Fixed offering period (months) with respect to the plan.

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No definition available.

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- Definition

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

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

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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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- Definition

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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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Share-Based Compensation - Narrative (Details)				1 Months Ended		9 Months Ended	12 Months Ended			13 Months Ended
Share-Based Compensation - Narrative (Details)	Jan. 01, 2019 shares	Jan. 18, 2012 shares	Oct. 24, 2011	Dec. 31, 2011 period shares	Aug. 31, 2010 shares	Sep. 30, 2011	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 17, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized tax benefits related to share options exercised \| $							$ 7,700,000	$ 8,900,000	$ 8,300,000
Aggregate intrinsic value of share options exercised \| $							43,400,000	38,900,000	36,100,000
Share Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock options \| $							$ 76,100,000
Unrecognized compensation cost, weighted-average period of recognition (in years)							2 years 6 months 20 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)							4 years
Unrecognized compensation cost, weighted-average period of recognition (in years)							2 years 5 months 15 days
RSUs weighted-average grant date fair value (in dollars per share) \| $ / shares							$ 146.36
Number of RSUs released (in shares)							374,000
Shares issued (in shares)							253,000
Shares withheld for tax purposes (in shares)							121,000
Total fair value of shares vested \| $							$ 55,800,000	53,200,000	59,200,000
Unrecognized compensation cost related to unvested RSUs \| $							$ 94,800,000
2011 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)				4 years
Shares authorized for issuance (in shares)							24,424,669
2011 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants expiration period (in years)				10 years
2011 Equity Incentive Plan, Option One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance, annual automatic increase, maximum percentage of outstanding shares				4.50%
2011 Equity Incentive Plan, Option Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares reserved under plan (in shares)				5,000,000
2007 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)		1,000,000
2007 Equity Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)		1 year								3 years
2007 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)		3 years								5 years
Grants expiration period (in years)		10 years								10 years
2007 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)							3,558,471
ESPP discount rate (as a percent)				15.00%
ESPP offering period (in months)				24 months
Number of purchase periods within each ESPP offering period \| period				4
Number of shares available for issuance (in shares)				175,000
Unrecognized compensation cost related to grants under the ESPP \| $							$ 6,000,000
2007 Employee Stock Purchase Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, weighted-average period of recognition (in years)							1 year 2 months
2007 Employee Stock Purchase Plan Option One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance, annual automatic increase, maximum percentage of outstanding shares				1.50%
2007 Employee Stock Purchase Plan Option Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares reserved under plan (in shares)				1,000,000
2007 Directors Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under deferred compensation plan (in shares)							903,938
2007 Directors Award Plan \| Initial Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)						3 years
2007 Directors Award Plan \| Annual Automatic Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)						1 year
2007 Directors Award Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)			1 year
2007 Directors Award Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)			3 years
Grants expiration period (in years)			10 years
Directors Deferred Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares reserved under plan (in shares)					200,000
Recorded expense related to retainer fees earned and deferred \| $							$ 0	$ 0	$ 0
Deferred compensation arrangement with individuals, shares unissued (in shares)							14,499
Subsequent Event \| 2011 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares reserved under plan (in shares)	2,587,659
Subsequent Event \| 2007 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares reserved under plan (in shares)	862,553