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INVESTMENTS - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($)
Debt and Equity Securities, FV-NI [Line Items] |  |
Upward price adjustments | $ 1.8 | $ 1.8
Impairment of equity securities |  | 0.7
Other expense (income), net |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Increase in non-marketable equity securities due to observable price changes | 3.8 | 3.8
Decrease in non-marketable equity securities due to observable price changes | $ 2.6 | $ 2.6

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