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LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross loss and LAE reserves, January 1 $ 237.2 $ 140.7
Reinsurance recoverable on unpaid losses (79.6) (18.9)
Net loss and LAE reserves, January 1 157.6 121.8
Net incurred loss and LAE related to:    
Current year 69.8 122.0
Prior years (9.9) 7.9
Total incurred 59.9 129.9
Net paid loss and LAE related to:    
Current year 25.3 44.1
Prior years 35.3 54.2
Total paid 60.6 98.3
Net loss and LAE reserves, March 31 156.9 153.4
Plus reinsurance recoverable on unpaid losses 83.8 22.2
Gross loss and LAE reserves, March 31 $ 240.7 $ 175.6