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INVESTMENTS - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
investment
Debt and Equity Securities, FV-NI [Line Items]    
Number of investments | investment   0
Upward price adjustments $ 1.0  
Other income, net    
Debt and Equity Securities, FV-NI [Line Items]    
Increase in non-marketable equity securities due to observable price changes 4.8  
Decrease in non-marketable equity securities due to observable price changes $ 2.6