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INVESTMENTS - Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Net Investment Income [Line Items]        
Realized gain value $ 10.5 $ 7.0 $ 20.3 $ 13.8
Investment expense (0.5) (0.2) (1.1) (0.3)
Net investment income 10.0 6.8 19.2 13.5
Interest on bonds        
Net Investment Income [Line Items]        
Realized gain value 2.3 1.0 4.0 1.9
Interest on deposits and cash equivalents        
Net Investment Income [Line Items]        
Realized gain value $ 8.2 $ 6.0 $ 16.3 $ 11.9