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PENSION AND POSTRETIREMENT BENEFITS - Schedule of Other Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 26, 2019 | May 27, 2018
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net amount recognized | $ 43.2 | $ (34.0) | $ 113.0
Pension Benefits |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net actuarial gain (loss) | 21.9 | (72.1) |
Amendments | 0.0 | (1.4) |
Amortization of prior service cost (benefit) | 2.7 | 3.1 |
Settlement and curtailment gain | (1.3) | 0.0 |
Recognized net actuarial loss (gain) | 44.8 | 5.1 |
Net amount recognized | 68.1 | (65.3) |
Other Benefits |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net actuarial gain (loss) | (2.9) | 25.1 |
Amendments | 0.0 | 0.8 |
Amortization of prior service cost (benefit) | (2.1) | (2.2) |
Settlement and curtailment gain | (0.2) | (1.6) |
Recognized net actuarial loss (gain) | (4.6) | (1.4) |
Net amount recognized | $ (9.8) | $ 20.7 |

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