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EQUITY INVESTMENTS - Summary of Significant Unobservable Inputs used in Level 3 Valuation (Details) - Wella Business $ in Millions | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Nov. 30, 2020 USD ($)
--- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 1,250.0 | $ 1,186.5 | $ 1,634.5
Fair Value, Inputs, Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 1,250.0 |  |
Fair Value, Inputs, Level 3 | Discounted cash flows | Discount rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Unobservable input | 0.1125 |  |
Fair Value, Inputs, Level 3 | Discounted cash flows | Growth rate | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Unobservable input | 0.015 |  |
Fair Value, Inputs, Level 3 | Discounted cash flows | Growth rate | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Unobservable input | 0.086 |  |
Fair Value, Inputs, Level 3 | Market multiple | Revenue multiple | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Unobservable input | 1.8 |  |
Fair Value, Inputs, Level 3 | Market multiple | Revenue multiple | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Unobservable input | 2.0 |  |
Fair Value, Inputs, Level 3 | Market multiple | EBITDA multiple | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Unobservable input | 12.0 |  |
Fair Value, Inputs, Level 3 | Market multiple | EBITDA multiple | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Unobservable input | 15.0 |  |

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