LEASES - Lease cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Lease Cost:
Operating lease cost	$ 21.4	$ 20.7	$ 60.4	$ 72.5
Short-term lease cost	0.1	0.5	0.5	1.8
Variable lease cost	8.3	13.0	38.6	33.3
Sublease income	(5.6)	(2.1)	(10.1)	(6.7)
Net lease cost	24.2	32.1	89.4	100.9
Other information:
Operating cash outflows from operating leases	(29.2)	(25.4)	(109.1)	(76.8)
Right-of-use assets obtained in exchange for lease obligations	$ 16.6	$ 9.0	$ 27.4	$ 6.7
Weighted-average remaining lease term - real estate	6 years 6 months	7 years 4 months 24 days	6 years 6 months	7 years 4 months 24 days
Weighted-average discount rate - real estate leases	3.55%	3.12%	3.55%	3.12%