Goodwill and Other Intangible Assets (Schedule of changes in the carrying amount of goodwill) (Details) $ in Millions	9 Months Ended
	Feb. 28, 2016 USD ($)
Goodwill [Line Items]
Beginning balance	$ 8,874.9
Acquisitions	82.7
Divestiture	(184.5)
Other activity, primarily foreign currency translation	(80.7)
Ending balance	8,692.4
U.S. Retail [Member]
Goodwill [Line Items]
Beginning balance	6,419.0
Acquisitions	54.1
Divestiture	(180.2)
Other activity, primarily foreign currency translation	0.0
Ending balance	6,292.9
International [Member]
Goodwill [Line Items]
Beginning balance	1,133.3
Acquisitions	28.6
Divestiture	(4.3)
Other activity, primarily foreign currency translation	(78.7)
Ending balance	1,078.9
Convenience Stores and Foodservice [Member]
Goodwill [Line Items]
Beginning balance	921.1
Acquisitions	0.0
Divestiture	0.0
Other activity, primarily foreign currency translation	0.0
Ending balance	921.1
Joint Ventures [Member]
Goodwill [Line Items]
Beginning balance	401.5
Acquisitions	0.0
Divestiture	0.0
Other activity, primarily foreign currency translation	(2.0)
Ending balance	$ 399.5