PENSION AND POSTRETIREMENT BENEFITS - Schedule of Funded Status and Amounts Recognized (Details) - USD ($) $ in Millions	May 27, 2018	May 28, 2017	Dec. 31, 2016
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded Status	$ (68.5)	$ (565.1)
Amounts Recognized in Consolidated Balance Sheets
Other assets	103.0	17.1
Other accrued liabilities	(11.8)	(10.9)
Other noncurrent liabilities	(159.7)	(571.3)
Net Amount Recognized	(68.5)	(565.1)
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-tax)
Actuarial net loss (gain)	48.8	174.2
Net prior service cost (benefit)	13.8	16.0
Total	$ 62.6	$ 190.2
Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations at May 27, 2018 and May 28, 2017
Discount rate	4.14%	3.90%	4.11%
Long-term rate of compensation increase		3.63%
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded Status	$ (115.6)	$ (156.9)
Amounts Recognized in Consolidated Balance Sheets
Other assets	2.6	0.0
Other accrued liabilities	(16.2)	(18.4)
Other noncurrent liabilities	(102.0)	(138.5)
Net Amount Recognized	(115.6)	(156.9)
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-tax)
Actuarial net loss (gain)	(25.8)	(9.0)
Net prior service cost (benefit)	(18.4)	(4.6)
Total	$ (44.2)	$ (13.6)
Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations at May 27, 2018 and May 28, 2017
Discount rate	3.81%	3.33%