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Stock-Based Compensation - Share-based Payment Arrangement, Expensed and Capitalized, Amount (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		$ 59.2	$ 54.3	$ 123.0	$ 221.8
IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense	$ 148.5				148.5
Commissions and other related expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		6.4	11.7	23.4	56.3
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		11.2	8.6	21.9	17.6
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		4.1	2.8	8.4	7.8
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		18.9	13.5	35.8	63.0
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		$ 18.6	$ 17.7	$ 33.5	77.1
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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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+ References

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