LEASES - Components of Total Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Feb. 23, 2020	Feb. 23, 2020
Lease Cost [Abstract]
Operating lease cost	$ 14.3	$ 51.1
Finance lease cost
Depreciation of leased assets	3.9	11.6
Interest on lease liabilities	2.2	6.7
Short-term lease cost	1.4	2.8
Total lease cost	$ 21.8	$ 72.2