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Financial Instruments, Risk Management Activities, and Fair Values (Schedule of cashflow hedge in AOCI) (Details) - USD ($)
$ in Millions
May 28, 2017
May 29, 2016
Derivative [Line Items]    
After-tax gain (loss) in AOCI related to hedge derivatives $ 1.5 $ (25.5)
Interest Rate Contracts [Member]    
Derivative [Line Items]    
After-tax gain (loss) in AOCI related to hedge derivatives (12.9)  
Foreign Exchange Contracts [Member]    
Derivative [Line Items]    
After-tax gain (loss) in AOCI related to hedge derivatives $ 14.4