Restructuring Initiatives (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2016 USD ($)	Feb. 22, 2015 USD ($)	Feb. 28, 2016 USD ($) positions	Feb. 22, 2015 USD ($)
Restructuring and Related Cost [Line Items]
Net restructuring charges	$ 34.2	$ 71.2	$ 199.2	$ 318.4
Cash payments for restructuring			116.2
Expected additional project-related costs			111.0
Q1 2016 Project Compass [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges		0.0	$ 52.8	0.0
Reduction in estimated restructuring charges	0.8
Q1 2016 Project Compass [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Aug. 30, 2015
Restructuring action completion date			May 28, 2017
Expected cash payments for restructuring			$ 61.0
Net restructuring charges			$ 52.8
Q1 2016 Project Compass [Member] | International [Member] | Minimum Member
Restructuring and Related Cost [Line Items]
Number of positions affected | positions			725
Expected net expense of restructuring action	62.0		$ 62.0
Q1 2016 Project Compass [Member] | International [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Number of positions affected | positions			775
Expected net expense of restructuring action	65.0		$ 65.0
Q2 2015 Project Century [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			May 31, 2015
Net restructuring charges	43.9	69.9	$ 155.1	158.8
Q2 2016 Project Century, Exit Berwick and East Tamaki Facilities [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Nov. 29, 2015
Restructuring action completion date			May 28, 2017
Number of positions affected | positions			285
Expected cash payments for restructuring			$ 22.0
Net restructuring charges	17.9		18.3
Q2 2016 Project Century, Exit Berwick and East Tamaki Facilities [Member] | International [Member] | Minimum Member
Restructuring and Related Cost [Line Items]
Expected net expense of restructuring action	47.0		47.0
Q2 2016 Project Century, Exit Berwick and East Tamaki Facilities [Member] | International [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Expected net expense of restructuring action	52.0		$ 52.0
Q1 2016 Project Century, Exit West Chicago Facility [Member] | U.S. Retail [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Aug. 30, 2015
Restructuring action completion date			May 26, 2019
Number of positions affected | positions			500
Expected net expense of restructuring action	114.0		$ 114.0
Expected cash payments for restructuring			57.0
Net restructuring charges	8.2		$ 72.2
Q1 2016 Project Century, Exit Joplin Facility [Member] | U.S. Retail [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Aug. 30, 2015
Restructuring action completion date			May 29, 2016
Number of positions affected | positions			120
Expected net expense of restructuring action	8.0		$ 8.0
Net restructuring charges	0.6		8.4
Q1 2016 Project Century, Exit Joplin Facility [Member] | U.S. Retail [Member] | Maximum [Member]
Restructuring and Related Cost [Line Items]
Expected cash payments for restructuring			$ 1.0
Q3 2015 Project Century, Exit Midland Facility [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Feb. 22, 2015
Restructuring action completion date			May 27, 2018
Number of positions affected | positions			100
Expected net expense of restructuring action	23.0		$ 23.0
Expected cash payments for restructuring			15.0
Net restructuring charges		5.7	$ 1.3
Q3 2015 Project Century, Exit New Albany Facility [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Feb. 22, 2015
Restructuring action completion date			May 27, 2018
Number of positions affected | positions			400
Expected net expense of restructuring action	84.0		$ 84.0
Expected cash payments for restructuring			42.0
Net restructuring charges	7.5	47.4	$ 13.0
Q2 2015 Project Century, Exit Methuen Facility [Member] | U.S. Retail and Convenience Stores and Foodservice Segments [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Nov. 23, 2014
Restructuring action completion date			May 29, 2016
Number of positions affected | positions			250
Expected net expense of restructuring action	64.0		$ 64.0
Expected cash payments for restructuring			13.0
Net restructuring charges		9.2	$ 13.8	34.9
Q2 2015 Project Century, Exit Lodi Facility [Member] | U.S. Retail [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Nov. 23, 2014
Restructuring action completion date			May 29, 2016
Number of positions affected | positions			430
Expected net expense of restructuring action	85.0		$ 85.0
Expected cash payments for restructuring			20.0
Net restructuring charges	9.4	8.7	26.4	53.5
Charges Related to Project Century Restructuring Actions Previously Announced [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges	1.7		$ 1.7	17.3
Q2 2015 Project Catalyst [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Nov. 23, 2014
Restructuring action completion date			May 31, 2015
Number of positions affected | positions			750
Expected net expense of restructuring action	140.0		$ 140.0
Expected cash payments for restructuring			103.0
Net restructuring charges		$ 1.3		146.3
Reduction in estimated restructuring charges	8.9		8.7
Q1 2015 Combination of Certain Operational Facilities [Member]
Restructuring and Related Cost [Line Items]
Net restructuring charges			$ 0.0	13.9
Q1 2015 Combination of Certain Operational Facilities [Member] | International [Member]
Restructuring and Related Cost [Line Items]
Restructuring action initiation date			Aug. 24, 2014
Restructuring action completion date			May 28, 2017
Number of positions affected | positions			240
Expected net expense of restructuring action	$ 15.0		$ 15.0
Expected cash payments for restructuring			$ 12.0
Net restructuring charges				$ 13.9