LEASES - Lease cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Lease Cost:
Operating lease cost	$ 18.8	$ 19.0	$ 56.6	$ 57.5
Short-term lease cost	1.2	0.1	2.0	0.6
Variable lease cost	11.5	10.8	31.1	27.6
Sublease income	(4.2)	(4.3)	(12.6)	(12.0)
Net lease cost	27.3	25.6	77.1	73.7
Other information:
Operating cash outflows from operating leases	(18.0)	(16.8)	(55.2)	(57.2)
Right-of-use assets obtained in exchange for lease obligations		$ 0.4		$ 14.2
Right-of-use assets obtained in exchange for lease obligations	$ (2.0)		$ 30.7
Weighted-average remaining lease term - real estate	6 years 10 months 24 days	7 years 4 months 24 days	6 years 10 months 24 days	7 years 4 months 24 days
Weighted-average discount rate - real estate leases	4.51%	4.09%	4.51%	4.09%