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SHARE-BASED COMPENSATION - Share-based Compensation Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense $ 3.8 $ 5.2 $ 8.4 $ 7.7
Restricted stock unit expense        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense 3.4 4.9 7.6 7.0
Performance-based restricted stock unit expense        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense 0.3 0.0 0.5 0.0
Stock option expense        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense 0.1 0.3 0.3 0.7
Loss and loss adjustment expenses        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense 0.4 0.2 0.8 0.3
Sales and marketing        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense 0.2 0.1 0.3 0.2
Other insurance expense        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense 0.1 0.2 0.3 0.3
Technology and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense 0.7 0.8 1.5 1.5
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total share-based compensation expense $ 2.4 $ 3.9 $ 5.5 $ 5.4