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DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($)
1 Months Ended 6 Months Ended
Aug. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Cash received during the period for settlement of interest rate swaps $ 43,200,000 $ 43,200,000 $ 0  
Accumulated other comprehensive loss   (33,600,000)   $ (158,800,000)
Foreign exchange forward contracts        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Cash flow hedges in AOCI, net of tax   14,000,000   31,700,000
Cash flow hedge to be reclassified during next 12 months   (8,300,000)    
Foreign exchange forward contracts | Other Foreign Currency Translation Adjustments | Net investment hedge        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Accumulated other comprehensive loss   193,600,000   115,000,000
Designated as Hedging Instrument | Interest rate swap contracts | Interest Rate Risk        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount   $ 2,000,000,000.0   $ 2,000,000,000