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EQUITY INVESTMENTS - Summary of Significant Unobservable Inputs used in Level 3 Valuation (Details) - Wella Business
$ in Millions
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Nov. 30, 2020
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair value $ 1,650.0 $ 1,260.0 $ 1,634.5
Fair Value, Inputs, Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair value $ 1,650.0    
Fair Value, Inputs, Level 3 | Discounted cash flows | Discount rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Unobservable input percentage 0.1100    
Fair Value, Inputs, Level 3 | Discounted cash flows | Growth rate | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Unobservable input percentage 0.015    
Fair Value, Inputs, Level 3 | Discounted cash flows | Growth rate | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Unobservable input percentage 0.042    
Fair Value, Inputs, Level 3 | Market multiple | Revenue multiple | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Unobservable input percentage 2.0    
Fair Value, Inputs, Level 3 | Market multiple | EBITDA multiple | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Unobservable input percentage 11.5    
Fair Value, Inputs, Level 3 | Market multiple | EBITDA multiple | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Unobservable input percentage 17.5