SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounting Changes (Narrative) (Details) - USD ($) $ in Millions	May 26, 2019	May 28, 2018	May 27, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, less allowance for doubtful accounts	$ (831.7)		$ (569.4)
Inventories	1,571.7		988.7
Prepaid expenses and other current assets	93.8		184.9
Other accrued liabilities	691.6		671.0
Other noncurrent liabilities	1,951.8		$ 1,060.8
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of ASU		$ 0.5
Retained earnings | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of ASU		0.5
Adjustments | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, less allowance for doubtful accounts	(8.7)	7.6
Inventories	(3.1)	2.8
Prepaid expenses and other current assets	(16.6)	6.9
Other accrued liabilities	(1.1)	1.4
Other noncurrent liabilities	$ (2.5)	0.2
Adjustments | Retained earnings | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption of ASU		$ 0.5