Retirement Benefits and Postemployment Benefits (Schedule of amounts expected to be recognized in net periodic expense next year) (Details) $ in Millions	12 Months Ended
	May 29, 2016 USD ($)
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year [Abstract]
Amortization of losses	$ 190.3
Amortization of prior service costs (credits)	2.5
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year [Abstract]
Amortization of losses	2.5
Amortization of prior service costs (credits)	(5.4)
Postemployment Benefit Plans [Member]
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year [Abstract]
Amortization of losses	1.8
Amortization of prior service costs (credits)	$ 0.6