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INTANGIBLE ASSETS AND GOODWILL - Maturity Schedule (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Intangible assets        
Acquired intangible assets   $ 35.7    
Amortization expense   96.2 $ 112.9 $ 114.2
Estimated amortization expense related to intangible assets for the next five years and thereafter        
2020   82.7    
2021   22.4    
2022   17.6    
2023   12.9    
2024   10.7    
Thereafter   5.8    
Customer relationships        
Intangible assets        
Acquired intangible assets   $ 21.8    
Weighted average life   2 years 8 months 12 days    
Marketing relationships        
Intangible assets        
Acquired intangible assets   $ 13.9    
Weighted average life   5 years 10 months 24 days    
Signet        
Intangible assets        
Acquired intangible assets $ 52.3      
Signet | Customer relationships        
Intangible assets        
Acquired intangible assets $ 35.9      
Weighted average life 3 years      
Signet | Marketing relationships        
Intangible assets        
Acquired intangible assets $ 16.4      
Weighted average life 7 years