LEASES - Lease cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Lease Cost:
Operating lease cost	$ 18.7	$ 19.3	$ 37.8	$ 38.5
Short-term lease cost	0.5	0.3	0.8	0.5
Variable lease cost	8.9	8.2	19.6	16.8
Sublease income	(4.5)	(3.9)	(8.4)	(7.7)
Net lease cost	23.6	23.9	49.8	48.1
Other information:
Operating cash outflows from operating leases	(18.0)	(18.7)	(37.2)	(40.4)
Right-of-use assets obtained in exchange for lease obligations	$ 17.7	$ 6.2	$ 32.7	$ 13.8
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	4.42%	4.07%	4.42%	4.07%