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SHARE-BASED COMPENSATION - Share-based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | $ 6.6 | $ 2.3
Restricted stock unit expense |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | 6.1 | 0.6
Stock option expense |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | 0.5 | 1.7
Loss and loss adjustment expenses |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | 0.2 | 0.1
Sales and marketing |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | 0.1 | 0.0
Other insurance expense |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | 0.2 | 0.1
Technology and development |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | 0.7 | 0.3
General and administrative |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | $ 5.4 | $ 1.8

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