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FAIR VALUE MEASUREMENTS - Narrative (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]        
Unrealized investment loss (gain) $ (18.1) $ 1.2 $ (33.0) $ 0.9