PENSION AND POSTRETIREMENT BENEFITS - Schedule of Funded Status and Amounts Recognized (Details) - USD ($) $ in Millions	May 30, 2021	May 31, 2020	Feb. 23, 2020	Jan. 31, 2020	Dec. 31, 2019	Nov. 24, 2019
Pension Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded Status	$ 109.6	$ (52.1)
Amounts Recognized in Consolidated Balance Sheets
Other assets	245.0	202.4
Other accrued liabilities	(10.3)	(8.9)
Other noncurrent liabilities	(125.1)	(245.6)
Net Amount Recognized	109.6	(52.1)
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-tax)
Actuarial net loss (gain)	(41.5)	51.2
Net prior service cost (benefit)	6.2	8.6
Total	$ (35.3)	$ 59.8
Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations at May 30, 2021 and May 31, 2020
Discount rate	3.04%	2.98%	2.96%	3.86%	3.37%	3.89%
Postretirement Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded Status	$ (78.2)	$ (86.4)
Amounts Recognized in Consolidated Balance Sheets
Other assets	3.0	2.9
Other accrued liabilities	(9.0)	(10.0)
Other noncurrent liabilities	(72.2)	(79.3)
Net Amount Recognized	(78.2)	(86.4)
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-tax)
Actuarial net loss (gain)	(12.9)	(15.0)
Net prior service cost (benefit)	(38.4)	(40.1)
Total	$ (51.3)	$ (55.1)
Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations at May 30, 2021 and May 31, 2020
Discount rate	2.51%	2.39%