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

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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 highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The highest quantity of shares an employee can purchase under the plan per period.

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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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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 03, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate ordinary shares repurchase	$ 11,785.1
Shares repurchase, shares	10,900,000	11,400,000	11,200,000
Shares repurchase, value	$ 1,299.5	$ 1,297.7	$ 1,278.0
Weighted average fair value granted under options	$ 25.9	$ 22.0	$ 22.8
Total intrinsic value of options exercised	$ 65.1	$ 81.7	$ 25.4
Weighted average fair value of stock units granted	$ 120.1	$ 105.3	$ 113.3
Total fair value of restricted stock units vested	$ 66.8	$ 49.6	$ 47.0
Unrecognized compensation expense	$ 281.6
Unrecognized compensation expense expected period of recognition (in years)	2 years
Options to purchase ordinary shares reserved for issuance	13.9
Share based compensation aggregate amount including options and units aggregate value outstanding	$ 139.6
Share based compensation arrangement by share based payment award options outstanding intrinsic value	$ 37.1		$ 244.3
Share based compensation arrangement by share based payment award equity instruments other than options non vested number	2,300,000	1,700,000
Options In The Money
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement by share based payment award options nonvested number of shares	6,500,000	9,400,000
Options Out Of Money
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement by share based payment award options nonvested number of shares	1,700,000	5,800,000
Share based compensation arrangement by share based payment award options outstanding intrinsic value	$ 0.0
Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized amount under share repurchase programs per quarter				$ 2,000.0
Authorized amount under share repurchase programs				$ 325.0
Two Thousand Five Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved and Authorized Shares, percent of ordinary shares issued and outstanding at year end	10.00%
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ordinary shares issued	1,900,000
Percentage of salary to purchase Ordinary shares			15.00%
Ordinary shares per employee, maximum			1,250
Price of Ordinary shares purchased under ESPP, percentage of lower of fair market value of Ordinary share on subscription date of each offering period or on purchase date			85.00%
Purchase of Ordinary shares by employees	400,000	400,000	300,000
Average price per share purchased by employees	$ 105.3	$ 95.4	$ 95.2
Compensation expense recognized	$ 10.9	$ 10.2	$ 8.0
US ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase ordinary shares reserved for issuance	500,000
Number of shares available under ESPP	800,000
Rest of the World ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase ordinary shares reserved for issuance	2,000,000.0
Performance Stock Units PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Share based compensation arrangement by share based payment award equity instruments other than options non vested number	100,000	0
Performance Stock Units PSU \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement by share based payment award equity instruments other than options non vested number	100,000