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BUSINESS COMBINATIONS - ghd Acquisition (Details)
£ in Millions
Nov. 21, 2016
USD ($)
Nov. 21, 2016
GBP (£)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]          
Goodwill     $ 8,972,800,000   $ 8,555,500,000
ghd          
Business Acquisition [Line Items]          
Net assets acquired (percent) 100.00%        
Total consideration to acquire business $ 531,500,000 £ 430.2      
Goodwill expected to be tax deductible 0        
Goodwill       $ 199,000,000 174,400,000
Luxury          
Business Acquisition [Line Items]          
Goodwill     3,067,100,000   3,093,100,000
Luxury | ghd          
Business Acquisition [Line Items]          
Goodwill 49,000,000        
Consumer Beauty          
Business Acquisition [Line Items]          
Goodwill     4,903,000,000   4,494,900,000
Consumer Beauty | ghd          
Business Acquisition [Line Items]          
Goodwill 42,000,000        
Professional Beauty          
Business Acquisition [Line Items]          
Goodwill     $ 1,002,700,000   $ 967,500,000
Professional Beauty | ghd          
Business Acquisition [Line Items]          
Goodwill $ 108,000,000