PENSION AND POSTRETIREMENT BENEFITS - Schedule of Funded Status and Amounts Recognized (Details) - USD ($) $ in Millions	May 26, 2019	May 27, 2018	Dec. 31, 2016
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded Status	$ (131.7)	$ (68.5)
Amounts Recognized in Consolidated Balance Sheets
Other assets	61.2	103.0
Other accrued liabilities	(10.2)	(11.8)
Other noncurrent liabilities	(182.7)	(159.7)
Net Amount Recognized	(131.7)	(68.5)
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-tax)
Actuarial net loss (gain)	115.8	48.8
Net prior service cost (benefit)	12.1	13.8
Total	$ 127.9	$ 62.6
Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations at May 26, 2019 and May 27, 2018
Discount rate	3.88%	4.14%	4.11%
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded Status	$ (87.8)	$ (115.6)
Amounts Recognized in Consolidated Balance Sheets
Other assets	2.8	2.6
Other accrued liabilities	(10.8)	(16.2)
Other noncurrent liabilities	(79.8)	(102.0)
Net Amount Recognized	(87.8)	(115.6)
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-tax)
Actuarial net loss (gain)	(47.8)	(25.8)
Net prior service cost (benefit)	(17.1)	(18.4)
Total	$ (64.9)	$ (44.2)
Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations at May 26, 2019 and May 27, 2018
Discount rate	3.48%	3.81%

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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