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DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2021
Jul. 31, 2021
Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Accumulated other comprehensive loss     $ (321,900,000)   $ (456,200,000)
Subsequent Event          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Percentage of external debt hedged with forward contracts (up to)       80.00%  
Net investment hedge          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Foreign exchange risk exposure, amount     1,809,500,000   3,591,000,000
Other Foreign Currency Translation Adjustments | Net investment hedge          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Accumulated other comprehensive loss     5,400,000   261,900,000
Cross-currency swap contracts | Net investment hedge          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Notional amount terminated $ 550,000,000.0        
Payments for hedge termination $ 37,600,000        
Interest rate swap contracts | Interest Rate Risk          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Notional amount terminated     700,000,000.0    
Payments for hedge termination     4,900,000    
Incremental notional amount   $ 1,000,000,000      
Notional amount     1,900,000,000   3,000,000,000
Foreign exchange forward contracts          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Accumulated cash flow hedges in AOCI/(L), net of tax     (15,500,000)   (43,000,000.0)
Cash flow hedge to be reclassified from AOCI/(L) during next 12 months     (7,300,000)    
Foreign exchange forward contracts | Other Foreign Currency Translation Adjustments | Net investment hedge          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Accumulated other comprehensive loss     $ (37,600,000)   $ (12,500,000)