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MAINLAND CHINA CONTRIBUTION PLAN AND PROFIT APPROPRIATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
MAINLAND CHINA CONTRIBUTION PLAN AND PROFIT APPROPRIATION      
Defined contribution plan expenses $ 16.4 $ 10.0 $ 5.7
Aggregate balance of statutory common reserves 171.7 $ 171.7 $ 149.5
Restrictions of statutory reserves $ 3,193.9