INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 23, 2020	Feb. 28, 2021	Feb. 23, 2020	May 31, 2020
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ 101.6	$ 68.9	$ 269.0	$ 141.5
Effective tax rate	26.50%	25.20%	21.30%	18.10%
Gross unrecognized tax benefits for uncertain tax positions	$ 34.4		$ 34.4		$ 35.8
Tax positions for which ultimate deductibility is highly certain but timing of such deductibility is uncertain	0.8		0.8		0.7
Related liabilities for gross interest and penalties	8.7		8.7		7.4
Net amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate	29.2		29.2		30.3
Gross unrecognized tax benefits, estimated decrease over the next twelve months (up to)	12.1		12.1
Deferred tax asset	654.7		654.7		685.2
Corresponding valuation allowances	653.7		653.7		685.2
Discontinued operations
Income Tax Contingency [Line Items]
Net amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate	$ 6.5		$ 6.5		$ 6.5