Financial Instruments, Risk Management Activities, and Fair Values (Schedule of offsetting assets and liabilities) (Details) - USD ($) $ in Millions		May 27, 2018	May 28, 2017
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets		$ 43.4	$ 30.8
Gross Liabilities Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Assets	[2]	43.4	30.8
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	(7.2)	(14.9)
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[4]	36.2	15.9
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities		(15.6)	(18.9)
Gross Assets Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Liabilities	[2]	(15.6)	(18.9)
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	7.2	14.9
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[5]	(8.4)	(4.0)
Commodity Contracts [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets		27.7	11.5
Gross Liabilities Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Assets	[2]	27.7	11.5
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	(1.1)	(7.2)
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[4]	26.6	4.3
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities		(1.1)	(8.2)
Gross Assets Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Liabilities	[2]	(1.1)	(8.2)
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	1.1	7.2
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[5]	0.0	(1.0)
Interest Rate Contracts [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets		0.0	0.9
Gross Liabilities Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Assets	[2]	0.0	0.9
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	(0.5)
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[4]	0.0	0.4
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities		(6.9)	(0.5)
Gross Assets Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Liabilities	[2]	(6.9)	(0.5)
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.5
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[5]	(6.9)	0.0
Foreign Exchange Contracts [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets		11.8	16.5
Gross Liabilities Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Assets	[2]	11.8	16.5
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	(5.7)	(7.2)
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[4]	6.1	9.3
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities		(7.2)	(10.2)
Gross Assets Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Liabilities	[2]	(7.2)	(10.2)
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	5.7	7.2
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[5]	(1.5)	(3.0)
Equity Contracts [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets		3.9	1.9
Gross Liabilities Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Assets	[2]	3.9	1.9
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	(0.4)	0.0
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[4]	3.5	1.9
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities		(0.4)	0.0
Gross Assets Offset in the Balance Sheet	[1]	0.0	0.0
Net Amounts of Liabilities	[2]	(0.4)	0.0
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet	[3]	0.4	0.0
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet	[3]	0.0	0.0
Net Amount	[5]	$ 0.0	$ 0.0

[1] Includes related collateral offset in our C onsolidated B alance S heets

[2] N et fair value as recorded in our C onsolidated B alance S heets.

[3] Fair value of assets and liabilities reported on a gross basis in our Consolidated Balance Sheets.

[4] Fair value of assets t hat could be reported net in our C onsolidated B alance S heets.

[5] Fair value of liabilities that could be reported net in our Consolidated Balance Sheets.