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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 536.4 $ 1,032.4
Net current period other comprehensive loss (3.7) (3.5)
Ending balance 468.7 934.3
Change in net unrealized gains (losses) on investments:    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 0.4 5.6
Other comprehensive loss before reclassifications (3.7) (1.1)
Net realized gains on investments reclassified from AOCI to net loss 0.0 (2.4)
Net current period other comprehensive loss (3.7) (3.5)
Ending balance $ (3.3) $ 2.1