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Previously granted stock options outside of plan.

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Share based compensation arrangement by share based payment award number of additional shares available for grant.

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Share based compensation arrangement by share based payment award restricted stock units granted.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of cash inflow from the issuance of equity classified as other.

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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 over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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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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Gross number of share options (or share units) granted during the period.

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Number of shares issued under share-based payment arrangement.

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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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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended			12 Months Ended
	Feb. 28, 2021	Feb. 28, 2021	Jun. 30, 2020	Jul. 31, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 28, 2022	Jan. 01, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term					10 years
Intrinsic value of stock options exercised					$ 124.1	$ 9.8	$ 19.1
Allocated share based compensation expense					386.3	43.2	37.4
Deferred compensation share-based arrangements, liability, current					84.8	0.0
Options unrecognized compensation					3.5
Proceeds from exercise of stock options					$ 26.9	$ 15.9	$ 7.6
Share based compensation by share based payment arrangement stock options granted during the period					3,375,940
Tax withholding obligations amount					$ 62.4
Shares based compensation arrangement, gran date fair value					$ 13.30
Early exercise of stock options					918,590
Previously granted stock options outside of plan							1,061,250
Accrued Expenses And Other Current Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from Other Equity					$ 3.2
Other Noncurrent Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from Other Equity					$ 3.0
Timebased vesting condition Not Yet Been Satisfied [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options unrecognized compensation period of recognition					3 years 10 months 24 days
Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of aggregate shares issued					10,871,486
Number of aggregate shares withheld					4,907,746
Tax withholding obligations amount					$ 62.4
SHARES Granted Under Stock Plans Subject To Repurchase [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares subject to repurchase					1,068,300
Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award restricted stock units granted					8,611,810	8,611,810
Executive Officer [Member] \| Service, performance and marketbased vesting conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement stock options granted during the period			1,620,540
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement by share based payment award number of additional shares available for grant									20,457,795
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense					$ 46.5	$ 31.9	$ 35.4
Options unrecognized compensation					$ 113.1
Options unrecognized compensation period of recognition					3 years 3 months 18 days
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense					$ 25.0
Deferred compensation share-based arrangements, liability, current					84.8
Fair value of stock units vested and converted to common stock					$ 203.5
Share based compensation arrangement,Service based vesting period					4 years
Restricted Stock Units [Member] \| Timebased vesting condition Not Yet Been Satisfied [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options unrecognized compensation period of recognition					3 years 3 months 18 days
Restricted Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement,Service based vesting period					5 years
Restricted Stock Units [Member] \| Time Based Vesting Condition Partly Satisfied [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options unrecognized compensation					$ 75.2
Restricted Stock Units [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued								13,624,457
IPO Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense					148.5
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense					1.5
Proceeds from exercise of stock options					$ 5.6
Unvested Restricted Stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options unrecognized compensation period of recognition					3 years 2 months 12 days
Equity instruments other than options unrecognized compensation					$ 479.4
Other Stock based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense					$ 1.2	1.1	1.1
Vesting period					4 years
Other Stock based Awards [Member] \| Executive Officer [Member] \| Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of aggregate shares issued				1,680,340
Shares based compensation arrangement, gran date fair value				$ 2.66
Other Stock based Awards [Member] \| Employees And Nonemployees [Member] \| Expenses incurred sale of shares to investors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense						8.0	0.0
Stock Based Awards Outside The Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense					$ 2.2	$ 8.0	$ 0.6
2012 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant					26,196,697
2012 Stock Incentive Plan [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term					10 years
2021 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	29,666,480	29,666,480
Share based compensation by share based payment arrangement increase in the shares authorised for issuance as a percentage of shares outstanding		5.00%
2021 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	7,416,620	7,416,620
Share based compensation by share based payment arrangement increase in the shares authorised for issuance as a percentage of shares outstanding	1.00%
Share based compensation by share based payment arrangement stock options granted during the period	0
2021 Employee Stock Purchase Plan [Member] \| January 1, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares added to the plan					3,918,007
2021 Employee Stock Purchase Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	150,000,000	150,000,000