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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

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