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FAIR VALUE MEASUREMENT - ADDITIONAL INFORMATION (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Floating rate senior term loan $ 1,437,800,000 $ 1,580,000,000.0
Fixed rate senior notes $450 million due August 2021    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Debt, fixed rate 4.10%  
Tranche C | Unsecured Senior Notes    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Senior Notes $ 450,000,000.0  
Estimate of Fair Value, Fair Value Disclosure    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Floating rate senior term loan 1,440,800,000 1,577,100,000
Carrying (Reported) Amount, Fair Value Disclosure    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Floating rate senior term loan $ 1,433,300,000 $ 1,575,500,000