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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Accounting Policies [Abstract]      
Restricted cash $ 45.5   $ 56.9
Effective income tax rate, percentage 33.40% 200.20%  
Effective income tax rate reconciliation, preliminary income tax benefit   $ 220.5  
Gross unrecognized tax benefits $ 278.5   279.9
Unrecognized tax benefits that would impact effective tax rate 158.2    
Unrecognized tax benefits, net 180.6   181.2
Interest and penalties expense 0.7 $ 1.3  
Gross accrued interest and penalties 22.4   $ 21.7
Reasonably possible decrease in UTBs (up to) $ 20.0