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FAIR VALUE MEASUREMENTS - UNREALIZED GAIN OR LOSS ON INVESTMENTS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value Disclosures [Abstract]        
Net unrealized losses included in earnings related to investments held at end of period $ 10.1   $ 13.4  
Net unrealized gains included in earnings related to investments held at end of period   $ 5.8   $ 9.8