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Financial Instruments, Risk Management Activities, and Fair Values (Schedule of cashflow hedge in AOCI) (Details) (USD $)
In Millions, unless otherwise specified
Feb. 22, 2015
May 25, 2014
Derivative [Line Items]    
After-tax gain (loss) in AOCI related to hedge derivatives $ (16.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ (38.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Interest Rate Contracts [Member]    
Derivative [Line Items]    
After-tax gain (loss) in AOCI related to hedge derivatives (34.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		  
Foreign Exchange Contracts [Member]    
Derivative [Line Items]    
After-tax gain (loss) in AOCI related to hedge derivatives $ 18.0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember