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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 26, 2019 | May 27, 2018 | May 28, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net amount recognized | $ (34.0) | $ 113.0 | $ 135.0
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net actuarial gain (loss) | (72.1) | 120.0 |
Amendments | (1.4) | (0.6) |
Amortization of prior service cost (benefit) | 3.1 | 2.9 |
Settlement and curtailment loss (gain) | 0.0 | 2.0 |
Recognized net actuarial loss (gain) | 5.1 | 3.4 |
Net amount recognized | (65.3) | 127.7 |
Other Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net actuarial gain (loss) | 25.1 | 16.8 |
Amendments | 0.8 | 17.2 |
Amortization of prior service cost (benefit) | (2.2) | (3.4) |
Settlement and curtailment loss (gain) | (1.6) | 0.0 |
Recognized net actuarial loss (gain) | (1.4) | 0.0 |
Net amount recognized | $ 20.7 | $ 30.6 |

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