DEBT - Deferred Issuance Costs and Write-offs (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Payments of debt issuance costs	$ 0.0	$ 39.6	$ 21.9
Writeoff of deferred financing fees	0.7	4.7	21.1
Writeoff of original debt discount	0.1	0.4	3.1
Line of Credit
Debt Instrument [Line Items]
Recognized deferred financing fees	0.0	9.2	25.4
Payments of debt issuance costs	$ 0.0	$ 27.0	$ 0.0