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SHARE-BASED COMPENSATION - Share-based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | $ 4.9 | $ 0.5 | $ 7.2 | $ 26.2
RSUs |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 4.2 | 0.0 | 4.8 | 0.0
Options |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 0.7 | 0.5 | 2.4 | 26.2
Loss and loss adjustment expenses |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 0.5 | 0.0 | 0.6 | 0.5
Sales and marketing |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 0.2 | 0.0 | 0.2 | 1.0
Other insurance expense |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 0.4 | 0.0 | 0.5 | 0.9
Technology and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 1.5 | 0.2 | 1.8 | 5.3
General and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | $ 2.3 | $ 0.3 | $ 4.1 | $ 18.5

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