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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

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