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LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Schedule of Reserve Balance (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]            
Gross loss and LAE reserves, January 1     $ 284.2 $ 287.4    
Reinsurance recoverable on unpaid losses     (43.8) (76.4)    
Net loss and LAE reserves, January 1 $ 324.1 $ 176.1 324.1 176.1 $ 240.4 $ 211.0
Net incurred loss and LAE related to:            
Current year     361.3 123.6    
Prior years     (4.6) (0.8)    
Total incurred 190.3 59.5 356.7 122.8    
Net paid loss and LAE related to:            
Current year     153.5 58.7    
Prior years     119.5 99.0    
Total paid     273.0 157.7    
Net loss and LAE reserves, June 30 324.1 176.1 324.1 176.1    
Plus reinsurance recoverable on unpaid losses 51.7 70.4 51.7 70.4    
Gross loss and LAE reserves, June 30 $ 375.8 $ 246.5 $ 375.8 $ 246.5