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Financial Instruments, Risk Management Activities, and Fair Values (Schedule of offsetting assets and liabilities) (Details) - USD ($)
May 30, 2021
May 31, 2020
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 68,400,000 $ 59,400,000
Gross Liabilities Offset in the Balance Sheet 0 0
Net Amounts of Assets 68,400,000 59,400,000
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet (5,400,000) (8,700,000)
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet (9,100,000) 0
Net Amount 53,900,000 50,700,000
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (39,200,000) (42,100,000)
Gross Assets Offset in the Balance Sheet 0 0
Net Amounts of Liabilities (39,200,000) (42,100,000)
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet 5,400,000 8,700,000
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet 0 15,900,000
Net Amount (33,800,000) (17,500,000)
Commodity Contracts [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 31,600,000 6,200,000
Gross Liabilities Offset in the Balance Sheet 0 0
Net Amounts of Assets 31,600,000 6,200,000
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet (1,300,000) (4,200,000)
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet (9,100,000) 0
Net Amount 21,200,000 2,000,000.0
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (1,300,000) (30,100,000)
Gross Assets Offset in the Balance Sheet 0 0
Net Amounts of Liabilities (1,300,000) (30,100,000)
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet 1,300,000 4,200,000
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet 0 15,900,000
Net Amount 0 (10,000,000.0)
Interest Rate Contracts [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 29,800,000 6,000,000.0
Gross Liabilities Offset in the Balance Sheet 0 0
Net Amounts of Assets 29,800,000 6,000,000.0
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet 0 (800,000)
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet 0 0
Net Amount 29,800,000 5,200,000
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 0 (8,000,000.0)
Gross Assets Offset in the Balance Sheet 0 0
Net Amounts of Liabilities 0 (8,000,000.0)
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet 0 800,000
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet 0 0
Net Amount 0 (7,200,000)
Foreign Exchange Contracts [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 4,800,000 38,600,000
Gross Liabilities Offset in the Balance Sheet 0 0
Net Amounts of Assets 4,800,000 38,600,000
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet (4,100,000) (3,700,000)
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet 0 0
Net Amount 700,000 34,900,000
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (37,900,000) (4,000,000.0)
Gross Assets Offset in the Balance Sheet 0 0
Net Amounts of Liabilities (37,900,000) (4,000,000.0)
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet 4,100,000 3,700,000
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet 0 0
Net Amount (33,800,000) (300,000)
Equity Contracts [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 2,200,000 8,600,000
Gross Liabilities Offset in the Balance Sheet 0 0
Net Amounts of Assets 2,200,000 8,600,000
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet 0 0
Cash Collateral Received, Gross Amounts Not Offset in the Balance Sheet 0 0
Net Amount 2,200,000 8,600,000
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 0 0
Gross Assets Offset in the Balance Sheet 0 0
Net Amounts of Liabilities 0 0
Financial Instruments, Gross Amounts Not Offset in the Balance Sheet 0 0
Cash Collateral Pledged, Gross Amounts Not Offset in the Balance Sheet 0 0
Net Amount $ 0 $ 0