Leases (Components of Lease Assets and Liabilities) (Details) $ in Millions	May 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 3,969.2
Finance lease right-of-use assets	278.0
Total lease assets, net	4,204.4
Operating lease liabilities - non-current	4,276.3
Total lease liabilities	4,811.0
Other assets
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	3,969.2
Land, buildings and equipment, net
Lessee, Lease, Description [Line Items]
Finance lease right-of-use assets	235.2
Other current liabilities
Lessee, Lease, Description [Line Items]
Operating lease liabilities - current	160.6
Finance lease liabilities - current	5.7
Other non-current liabilities
Lessee, Lease, Description [Line Items]
Operating lease liabilities - non-current	4,276.3
Other liabilities
Lessee, Lease, Description [Line Items]
Finance lease liabilities - non-current	$ 368.4