SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accumulated Balances for Each Component of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Millions	May 31, 2020	May 26, 2019	May 27, 2018	May 28, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated balances	$ 7,950.7	$ 7,463.7	$ 3,756.6	$ 4,077.8
Currency translation losses, net of reclassification adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated balances	(125.7)	(90.9)	(94.7)
Derivative adjustments, net of reclassification adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated balances	26.3	34.0	1.0
Unrealized gains on available-for-sale securities
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated balances			0.6
Pension and postretirement benefit obligations, net of reclassification adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated balances	(10.2)	(53.4)	(17.4)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated balances	$ (109.6)	$ (110.3)	$ (110.5)	$ (212.9)