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Stock-Based Compensation - Share-based Payment Arrangement, Expensed and Capitalized, Amount (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense	$ 63.8	$ 167.5
IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		148.5
Commissions and other related expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense	17.0	44.6
Commissions and other related expense | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		41.7
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense	10.7	9.0
Sales and marketing | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		1.8
Operations and support
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense	4.3	5.0
Operations and support | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		3.1
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense	16.9	49.5
Research and development | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		46.9
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense	$ 14.9	59.4
General and administrative | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		$ 55.0

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section S99
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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