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INVESTMENTS - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Debt and Equity Securities, FV-NI [Line Items]    
Upward price adjustment during period $ 0.3 $ 0.3
Other income, net    
Debt and Equity Securities, FV-NI [Line Items]    
Increase in non-marketable equity securities due to observable price changes 2.0 2.0
Decrease in non-marketable equity securities due to observable price changes $ 1.9 $ 1.9