SHARE-BASED COMPENSATION PLANS - Performance Restricted Stock Units Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation (income) expense	$ 53.0	$ 91.8	$ 137.6
Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	4.1
Total share-based compensation (income) expense	$ (3.5)	10.7	1.5
Total intrinsic value of restricted shares vested and settled	0.0	0.0	0.0
Performance Restricted Stock Units | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation (income) expense	$ (3.7)	$ 5.4	$ 0.0
Performance Restricted Stock Units | Omnibus Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	4.1	4.0	1.2