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RELATED PARTY TRANSACTIONS - (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income      
Related Party Transaction [Line Items]      
Revenue from related parties $ 2.2 $ 0.3 $ 0.3
Southeast Catastrophe Consulting Company      
Related Party Transaction [Line Items]      
Expenses from transactions with related party     $ 6.7