Retirement Benefits and Postemployment Benefits (Schedule of amounts recognized in AOCI) (Details) - USD ($) $ in Millions	May 29, 2016	May 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	$ (1,958.2)	$ (1,756.1)
Prior service (costs) credits	11.9	7.1
Amounts recorded in accumulated other comprehensive loss	(1,946.3)	(1,749.0)
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	(1,886.0)	(1,674.9)
Prior service (costs) credits	(6.8)	(13.8)
Amounts recorded in accumulated other comprehensive loss	(1,892.8)	(1,688.7)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	(57.6)	(72.2)
Prior service (costs) credits	19.9	23.8
Amounts recorded in accumulated other comprehensive loss	(37.7)	(48.4)
Postemployment Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	(14.6)	(9.0)
Prior service (costs) credits	(1.2)	(2.9)
Amounts recorded in accumulated other comprehensive loss	$ (15.8)	$ (11.9)