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PENSION AND POSTRETIREMENT BENEFITS - Schedule of Funded Status and Amounts Recognized (Details) - USD ($) $ in Millions | May 30, 2021 | May 31, 2020 | Feb. 23, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Nov. 24, 2019
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Pension Plans |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Funded Status | $ 109.6 | $ (52.1) |  |  |  |
Amounts Recognized in Consolidated Balance Sheets |  |  |  |  |  |
Other assets | 245.0 | 202.4 |  |  |  |
Other accrued liabilities | (10.3) | (8.9) |  |  |  |
Other noncurrent liabilities | (125.1) | (245.6) |  |  |  |
Net Amount Recognized | 109.6 | (52.1) |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-tax) |  |  |  |  |  |
Actuarial net loss (gain) | (41.5) | 51.2 |  |  |  |
Net prior service cost (benefit) | 6.2 | 8.6 |  |  |  |
Total | $ (35.3) | $ 59.8 |  |  |  |
Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations at May 30, 2021 and May 31, 2020 |  |  |  |  |  |
Discount rate | 3.04% | 2.98% | 2.96% | 3.86% | 3.37% | 3.89%
Postretirement Plans |  |  |  |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Funded Status | $ (78.2) | $ (86.4) |  |  |  |
Amounts Recognized in Consolidated Balance Sheets |  |  |  |  |  |
Other assets | 3.0 | 2.9 |  |  |  |
Other accrued liabilities | (9.0) | (10.0) |  |  |  |
Other noncurrent liabilities | (72.2) | (79.3) |  |  |  |
Net Amount Recognized | (78.2) | (86.4) |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Pre-tax) |  |  |  |  |  |
Actuarial net loss (gain) | (12.9) | (15.0) |  |  |  |
Net prior service cost (benefit) | (38.4) | (40.1) |  |  |  |
Total | $ (51.3) | $ (55.1) |  |  |  |
Weighted-Average Actuarial Assumptions Used to Determine Benefit Obligations at May 30, 2021 and May 31, 2020 |  |  |  |  |  |
Discount rate | 2.51% | 2.39% |  |  |  |

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