LEASES - Lease cost (Details) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Lease Cost:
Operating lease cost	$ 34.1	$ 96.2
Short-term lease cost	0.5	1.8
Variable lease cost	17.5	45.2
Sublease income	(2.1)	(6.7)
Net lease cost	50.0	136.5
Other information:
Operating cash outflows from operating leases	(31.7)	(94.8)
Right-of-use assets obtained in exchange for lease obligations	$ 11.4	$ 15.5
Weighted-average remaining lease term - real estate	7 years 4 months 24 days	7 years 4 months 24 days
Weighted-average discount rate - real estate leases	3.38%	3.38%