LEASES - Lease cost (Details) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Lease Cost:
Operating lease cost	$ 30.4	$ 62.1
Short-term lease cost	0.6	1.3
Variable lease cost	15.3	27.7
Sublease income	(2.4)	(4.6)
Net lease cost	43.9	86.5
Other information:
Operating cash outflows from operating leases	31.2	63.1
Right-of-use assets obtained in exchange for lease obligations	$ 29.1	$ 4.1
Weighted-average remaining lease term - real estate	7 years 7 months 6 days	7 years 7 months 6 days
Weighted-average discount rate - real estate leases	3.48%	3.48%