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