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RESTRUCTURING ACTIVITIES - Schedule of Liabilities Recorded for the Restructuring Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 27, 2018
Restructuring Cost and Reserve |  |
Costs Incurred and Charged to Expense |  | $ 48.2
Pinnacle Integration Restructuring Plan |  |
Restructuring Cost and Reserve |  |
Beginning balance | $ 97.5 |
Costs Incurred and Charged to Expense | 53.2 |
Costs Paid or Otherwise Settled | (116.9) |
Changes in Estimates | (2.2) |
Ending balance | 31.6 |
Pinnacle Integration Restructuring Plan | Severance and related costs |  |
Restructuring Cost and Reserve |  |
Beginning balance | 76.9 |
Costs Incurred and Charged to Expense | 11.0 |
Costs Paid or Otherwise Settled | (62.1) |
Changes in Estimates | (2.2) |
Ending balance | 23.6 |
Pinnacle Integration Restructuring Plan | Contract/lease termination |  |
Restructuring Cost and Reserve |  |
Beginning balance | 1.0 |
Costs Incurred and Charged to Expense | 4.6 |
Costs Paid or Otherwise Settled | (5.1) |
Ending balance | 0.5 |
Pinnacle Integration Restructuring Plan | Consulting/professional fees |  |
Restructuring Cost and Reserve |  |
Beginning balance | 18.4 |
Costs Incurred and Charged to Expense | 30.0 |
Costs Paid or Otherwise Settled | (40.9) |
Ending balance | 7.5 |
Pinnacle Integration Restructuring Plan | Other costs |  |
Restructuring Cost and Reserve |  |
Beginning balance | 1.2 |
Costs Incurred and Charged to Expense | 7.6 |
Costs Paid or Otherwise Settled | (8.8) |
Conagra Restructuring Plan |  |
Restructuring Cost and Reserve |  |
Beginning balance | 1.2 |
Costs Incurred and Charged to Expense | 11.3 |
Costs Paid or Otherwise Settled | (5.5) |
Changes in Estimates | (0.5) |
Ending balance | 6.5 |
Conagra Restructuring Plan | Severance and related costs |  |
Restructuring Cost and Reserve |  |
Beginning balance | 1.2 |
Costs Incurred and Charged to Expense | 7.5 |
Costs Paid or Otherwise Settled | (1.7) |
Changes in Estimates | (0.5) |
Ending balance | 6.5 |
Conagra Restructuring Plan | Contract/lease termination |  |
Restructuring Cost and Reserve |  |
Costs Incurred and Charged to Expense | 0.1 |
Costs Paid or Otherwise Settled | (0.1) |
Conagra Restructuring Plan | Other costs |  |
Restructuring Cost and Reserve |  |
Costs Incurred and Charged to Expense | 3.7 |
Costs Paid or Otherwise Settled | $ (3.7) |

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