SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
Accounting Policies [Abstract]
Restricted cash	$ 39.1		$ 39.1		$ 56.9
Effective income tax rate, percentage	16.00%	68.20%	25.10%	156.90%
Income tax benefit, revaluation of deferred tax assets	$ 18.8
Effective income tax rate reconciliation, preliminary income tax benefit				$ 220.5
Gross unrecognized tax benefits	267.9		$ 267.9		279.9
Unrecognized tax benefits that would impact effective tax rate	147.7		147.7
Unrecognized tax benefits, net	169.0		169.0		181.2
Interest and penalties expense	(1.0)	$ (0.2)	(0.3)	$ 1.0
Gross accrued interest and penalties	21.4		21.4		$ 21.7
Reasonably possible decrease in UTBs (up to)	$ 20.7		$ 20.7