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BUSINESS COMBINATIONS - ghd Acquisition (Details)
£ in Millions
Nov. 21, 2016
USD ($)
Nov. 21, 2016
GBP (£)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]            
Goodwill     $ 5,073,800,000 $ 8,607,100,000   $ 8,555,500,000
ghd            
Business Acquisition [Line Items]            
Percentage of shares acquired 100.00% 100.00%        
Total consideration to acquire business $ 531,500,000 £ 430.2        
Goodwill to be tax deductible     0      
Goodwill         $ 199,000,000.0 $ 174,400,000
Luxury | ghd            
Business Acquisition [Line Items]            
Goodwill     49,000,000.0      
Consumer Beauty | ghd            
Business Acquisition [Line Items]            
Goodwill     42,000,000.0      
Professional Beauty | ghd            
Business Acquisition [Line Items]            
Goodwill     $ 108,000,000.0