LEASES - Schedule of lease cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Lease Cost:
Operating lease cost	$ 17.7	$ 18.8	$ 55.9	$ 56.6
Short-term lease cost	0.8	1.2	2.2	2.0
Variable lease cost	10.9	11.5	33.4	31.1
Sublease income	(3.1)	(4.2)	(10.5)	(12.6)
Net lease cost	26.3	27.3	81.0	77.1
Other information:
Operating cash outflows from operating leases	(16.8)	(18.0)	(51.7)	(55.2)
Right-of-use assets obtained in exchange for lease obligations	$ 33.6		$ 52.7
Right-of-use assets obtained in exchange for lease obligations		$ (2.0)		$ 30.7
Weighted-average remaining lease term - real estate	6 years 4 months 24 days	6 years 10 months 24 days	6 years 4 months 24 days	6 years 10 months 24 days
Weighted-average discount rate - real estate leases	4.32%	4.51%	4.32%	4.51%