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Stock-Based Compensation - Share-based Payment Arrangement, Expensed and Capitalized, Amount (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | $ 167.5 | $ 11.1
Commissions and other related expense |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 44.6 | 4.1
Sales and marketing [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 9.0 | 2.9
Operations and support [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 5.0 | 0.8
Research and development[Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 49.5 | 0.5
General and administrative [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 59.4 | $ 2.8
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 |
Other Expense [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 19.0 |
Other Expense [Member] | Commissions and other related expense |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 2.9 |
Other Expense [Member] | Sales and marketing [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 7.2 |
Other Expense [Member] | Operations and support [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 1.9 |
Other Expense [Member] | Research and development[Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 2.6 |
Other Expense [Member] | General and administrative [Member] |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | $ 4.4 |

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