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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Impairment of equity securities without readily determinable fair value | $ (51.5) |
Write-off of notes receivable | (7.5) |
Interest income | $ 10.1 | $ 12.4
Gain (loss) on sale of business |  | (8.1)
Net foreign currency exchange gain (loss) |  | $ (1.9)

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