NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment - Components (Details) - USD ($) $ in Millions	May 31, 2020	May 26, 2019
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 2,942.7	$ 2,874.5
Less accumulated depreciation	(1,407.7)	(1,276.7)
Property, plant and equipment, net	1,535.0	1,597.8
Land and land improvements
Property, Plant and Equipment
Property, plant and equipment, at cost	107.2	142.2
Buildings, machinery, and equipment
Property, Plant and Equipment
Property, plant and equipment, at cost	2,670.1	2,542.3
Furniture, fixtures, office equipment, and other
Property, Plant and Equipment
Property, plant and equipment, at cost	107.1	105.2
Construction in progress
Property, Plant and Equipment
Property, plant and equipment, at cost	$ 58.3	$ 84.8