LEASES - Lease cost (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Lease Cost:
Operating lease cost	$ 19.2	$ 26.4
Short-term lease cost	0.2	0.6
Variable lease cost	13.9	10.3
Sublease income	(1.5)	(2.2)
Net lease cost	31.8	35.1
Other information:
Operating cash outflows from operating leases	(31.4)	(26.6)
Right-of-use assets obtained in exchange for lease obligations		$ (26.1)
Right-of-use assets obtained in exchange for lease obligations	$ 8.0
Weighted-average remaining lease term - real estate	6 years 9 months 18 days	7 years 7 months 6 days
Weighted-average discount rate - real estate leases	3.20%	3.92%