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INVESTMENTS - Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net Investment Income [Line Items]    
Realized gain value $ 0.8 $ 1.1
Investment expense (0.2) (0.2)
Net investment income 0.6 0.9
Interest on bonds    
Net Investment Income [Line Items]    
Realized gain value 0.6 0.8
Interest on deposits and cash equivalents    
Net Investment Income [Line Items]    
Realized gain value $ 0.2 $ 0.3