Goodwill and Other Intangible Assets (Schedule of changes in the carrying amount of other intangible assets) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	May 31, 2015	May 29, 2016	May 31, 2015	May 25, 2014
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance - carrying value		$ 4,677.0	$ 5,014.3	$ 5,015.1
Acquisitions		30.1	268.4
Divestiture		(119.6)
Impairment charge		0.0	(260.0)
Other activity, primarily foreign currency translation		(48.9)	(345.7)	(0.8)
Ending balance - carrying value	$ 4,677.0	4,538.6	4,677.0	5,014.3
Green Giant [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Impairment charge			(260.0)
U S Retail [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance - carrying value		3,311.9	3,307.5	3,312.4
Acquisitions		23.1	268.4
Divestiture		(119.6)
Impairment charge			(260.0)
Other activity, primarily foreign currency translation		(3.7)	(4.0)	(4.9)
Ending balance - carrying value	3,311.9	3,211.7	3,311.9	3,307.5
U S Retail [Member] | Green Giant [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Impairment charge	(260.0)		(260.0)
International [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance - carrying value		1,301.5	1,641.8	1,638.2
Acquisitions		7.0	0.0
Divestiture		0.0
Impairment charge			0.0
Other activity, primarily foreign currency translation		(44.6)	(340.3)	3.6
Ending balance - carrying value	1,301.5	1,263.9	1,301.5	1,641.8
Joint Ventures [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance - carrying value		63.6	65.0	64.5
Acquisitions		0.0	0.0
Divestiture		0.0
Impairment charge			0.0
Other activity, primarily foreign currency translation		(0.6)	(1.4)	0.5
Ending balance - carrying value	$ 63.6	$ 63.0	$ 63.6	$ 65.0