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SHARE-BASED COMPENSATION - Share-based Compensation Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
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