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INVESTMENTS - Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net Investment Income [Line Items]        
Total $ 0.9 $ 1.4 $ 1.9 $ 3.4
Investment expense (0.2) (0.1) (0.3) (0.2)
Net investment income 0.7 1.3 1.6 3.2
Interest on bonds        
Net Investment Income [Line Items]        
Total 0.6 1.2 1.3 2.1
Interest on deposits and cash equivalents        
Net Investment Income [Line Items]        
Total $ 0.3 $ 0.2 $ 0.6 $ 1.3