SHARE-BASED COMPENSATION PLANS - Restricted Share Units Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation (income) expense	$ 91.8	$ 137.6	$ 197.8
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	4.4
Total share-based compensation (income) expense	$ 78.5	131.9	197.2
Total intrinsic value of restricted shares vested and settled	166.7	34.3	33.5
Restricted Stock Units | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation (income) expense	$ 36.5	$ 96.6	$ 170.9
Restricted Stock Units | Omnibus Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	4.1	17.2	4.6
Restricted Stock Units | 2007 Stock Plan for Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0.3	0.3	0.3