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Stock-Based Compensation - Share-based Payment Arrangement, Expensed and Capitalized, Amount (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | $ 386.3 | $ 43.2 | $ 37.4
Commissions and other related expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 128.7 | 5.7 | 16.1
Sales and marketing [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 38.4 | 16.0 | 11.1
Operations and support [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 16.9 | 3.5 | 2.4
Research and development[Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 92.7 | 1.4 | 2.8
General and administrative [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 109.6 | $ 16.6 | $ 5.0
IPO Related Expense [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 148.5 |  |
IPO Related Expense [Member] | Commissions and other related expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 41.7 |  |
IPO Related Expense [Member] | Sales and marketing [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 1.8 |  |
IPO Related Expense [Member] | Operations and support [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 3.1 |  |
IPO Related Expense [Member] | Research and development[Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 46.9 |  |
IPO Related Expense [Member] | General and administrative [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | $ 55.0 |  |

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