Supplemental Information (Schedule of certain Consolidated Balance Sheet accounts) (Details) - USD ($) $ in Millions		May 29, 2016	May 31, 2015	May 25, 2014	May 26, 2013
Receivables [Abstract]
Customers		$ 1,390.4	$ 1,412.0
Less allowance for doubtful accounts		(29.6)	(25.3)
Total		1,360.8	1,386.7
Inventories [Abstract]
Raw materials and packaging		397.3	390.8
Finished goods		1,163.1	1,268.6
Grain		72.6	95.7
Excess of FIFO over LIFO cost	[1]	(219.3)	(214.2)
Total		1,413.7	1,540.9
LIFO Inventory Amount		841.0	867.5
Prepaid Expenses and Other Current Assets [Abstract]
Other receivables		159.3	148.8
Prepaid expenses		177.9	169.3
Derivative receivables, primarily commodity-related		44.6	80.9
Grain contracts		1.8	3.3
Miscellaneous		15.4	21.5
Total		399.0	423.8
Land, Buildings and Equipment [Abstract]
Land		92.9	96.0
Buildings		2,236.0	2,272.7
Equipment		5,945.6	6,091.1
Capitalized software		523.0	499.0
Construction in progress		702.7	622.2
Total land, buildings, and equipment		9,503.5	9,591.1
Less accumulated depreciation		(5,759.9)	(5,807.8)
Total		3,743.6	3,783.3
Other Assets [Abstract]
Investments in and advances to joint ventures		518.9	530.6
Pension assets		90.9	138.2
Exchangeable note with related party		12.7	30.7
Life insurance		26.3	26.6
Miscellaneous		102.9	85.1
Total		751.7	811.2
Other Current Liabilities [Abstract]
Accrued trade and consumer promotions		563.7	564.7
Accrued payroll		386.4	361.8
Dividends payable		23.8	27.9
Accrued taxes		110.5	20.7
Accrued interest, including interest rate swaps		90.4	91.8
Grains contracts		5.5	7.8
Restructuring and other exit costs reserve		76.6	120.8	$ 3.5	$ 19.5
Derivative payable		35.6	122.9
Miscellaneous		302.5	271.5
Total		1,595.0	1,589.9
Other Noncurrent Liabilities [Abstract]
Accrued compensation and benefits, including obligations for underfunded other postretirement benefit and postemployment benefit plans		1,755.0	1,451.4
Accrued taxes		204.0	202.5
Miscellaneous		128.6	90.9
Total		2,087.6	1,744.8
Buildings [Member]
Land, Buildings and Equipment [Abstract]
Capital leased assets		0.3	0.3
Equipment [Member]
Land, Buildings and Equipment [Abstract]
Capital leased assets		$ 3.0	$ 9.8

[1] Inventories of $841.0 million as of May 29, 2016 , and $867.5 million as of May 31, 2015 , were valued at LIFO. During fiscal 2015, LIFO inventory layers were reduced. Results of operations were not materially affected by these liquidations of LIFO inventory. The difference between replacement cost and the stated LIFO inventory value is not materially different from the reserve for th e LIFO valuation method.