LEASES - Components of Total Lease Cost (Details) $ in Millions	12 Months Ended
	May 31, 2020 USD ($)
Lease Cost [Abstract]
Operating lease cost	$ 63.7
Finance lease cost
Depreciation of leased assets	15.4
Interest on lease liabilities	9.1
Short-term lease cost	3.8
Total lease cost	$ 92.0