LEASES - Lease cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Lease Cost:
Operating lease cost	$ 21.2	$ 19.8	$ 42.1	$ 39.0
Short-term lease cost	0.3	0.2	0.6	0.4
Variable lease cost	10.0	16.4	18.9	30.3
Sublease income	(5.4)	(3.0)	(10.7)	(4.5)
Net lease cost	26.1	33.4	50.9	65.2
Other information:
Operating cash outflows from operating leases	(22.8)	(48.5)	(45.3)	(79.9)
Right-of-use assets obtained in exchange for lease obligations	$ 18.6	$ 2.8	$ 27.0	$ 10.8
Weighted-average remaining lease term - real estate	6 years 3 months 18 days	6 years 4 months 24 days	6 years 3 months 18 days	6 years 4 months 24 days
Weighted-average discount rate - real estate leases	3.49%	3.49%	3.49%	3.49%