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INVESTMENTS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]            
Available-for-sale securities and fair value option investments $ 0     $ 0   $ 0
Gain (loss) from changes in the fair value of fair value option investments     $ (1,400,000)      
Unrealized gain on investments 89,100,000     89,100,000    
Gain on sale of equity investments 2,200,000          
Other than temporary impairments on equity method investments         $ 6,700,000  
Other equity investments            
Schedule of Equity Method Investments [Line Items]            
Equity method investments 122,900,000     122,900,000   $ 37,700,000
Unrealized gain on investments $ 89,100,000     89,100,000    
Percentage of other equity investment sold 100.00%   50.00%      
Equity method investments $ 2,600,000 $ 4,200,000 $ 34,000,000      
Other than temporary impairments on equity method investments $ 0   $ 6,700,000 $ 0