PENSION AND POSTRETIREMENT BENEFITS - Schedule of Other Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2017	May 29, 2016	May 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net amount recognized	$ 135.0	$ (32.5)	$ (57.7)
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial gain (loss)	183.1	(390.5)
Amendments	(5.5)	(2.0)
Amortization of prior service cost (benefit)	2.9	2.7
Settlement loss	13.8	0.0
Recognized net actuarial loss	1.2	348.5
Net amount recognized	195.5	(41.3)
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial gain (loss)	32.4	(8.0)
Amendments	(0.4)	(5.6)
Amortization of prior service cost (benefit)	(6.6)	(7.8)
Settlement loss	0.0	0.0
Recognized net actuarial loss	0.5	0.1
Net amount recognized	$ 25.9	$ (21.3)