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LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Schedule of Reserve Balance (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Gross loss and LAE reserves, January 1       $ 320.2 $ 320.2 $ 237.2 $ 140.7
Reinsurance recoverable on unpaid losses       (79.5) (79.5) (79.6) (18.9)
Net loss and LAE reserves, January 1       240.7 240.7 157.6 121.8
Net incurred loss and LAE related to:              
Current year         348.1 405.9 341.9
Prior years         2.9 (13.6) 20.9
Total incurred $ 77.7 $ 80.9 $ 95.7 $ 96.7 351.0 392.3 362.8
Net paid loss and LAE related to:              
Current year         215.6 226.4 216.3
Prior years         165.1 82.8 110.7
Total paid         380.7 309.2 327.0
Net loss and LAE reserves 211.0       211.0 240.7 157.6
Plus reinsurance recoverable on unpaid losses 76.4       76.4 79.5 79.6
Gross loss and LAE reserves, December 31 $ 287.4       $ 287.4 $ 320.2 $ 237.2