Leases (Supplemental Cash Flow Information) (Details) $ in Millions	12 Months Ended
	May 31, 2020 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 371.7
Operating cash flows from finance leases	15.9
Financing cash flows from finance leases	5.2
Right-of-use assets obtained in exchange for lease liabilities
Right-of-use assets obtained in exchange for new operating lease liabilities	171.3
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 191.9
Weighted-Average Remaining Lease Term (Years)
Operating leases (years)	16 years 10 months 24 days
Finance leases (years)	20 years 7 months 6 days
Weighted-Average Discount Rate
Operating leases (percent)	4.20%
Finance leases (percent)	4.80%