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STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 12.2 | $ 12.4 | $ 32.4 | $ 38.9
Cost of revenue |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 0.3 | 0.4 | 0.9 | 1.2
Research and development expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 2.0 | 1.6 | 6.1 | 4.4
Sales and marketing expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 2.1 | 2.4 | 5.6 | 6.8
General and administrative expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 7.8 | $ 8.0 | $ 19.8 | $ 26.5

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