PENSION AND POSTRETIREMENT BENEFITS (Benefit Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 25, 2014	May. 26, 2013
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial gain (loss)	$ (143.8)	$ 12.7
Amendments	(0.6)	(2.2)
Amortization of prior service cost (benefit)	5.2	3.8
Recognized net actuarial loss	6.9	2.7	$ 3.6
Net amount recognized	(132.3)	17.0
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial gain (loss)	35.8	4.9
Amendments	3.3	5.7
Amortization of prior service cost (benefit)	(7.9)	(7.2)
Recognized net actuarial loss	3.5	6.7	$ 5.9
Net amount recognized	$ 34.7	$ 10.1