PENSION AND POSTRETIREMENT BENEFITS - Schedule of Other Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	May 26, 2019	May 27, 2018	May 28, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net amount recognized	$ (34.0)	$ 113.0	$ 135.0
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial gain (loss)	(72.1)	120.0
Amendments	(1.4)	(0.6)
Amortization of prior service cost (benefit)	3.1	2.9
Settlement and curtailment loss (gain)	0.0	2.0
Recognized net actuarial loss (gain)	5.1	3.4
Net amount recognized	(65.3)	127.7
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial gain (loss)	25.1	16.8
Amendments	0.8	17.2
Amortization of prior service cost (benefit)	(2.2)	(3.4)
Settlement and curtailment loss (gain)	(1.6)	0.0
Recognized net actuarial loss (gain)	(1.4)	0.0
Net amount recognized	$ 20.7	$ 30.6