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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2021 | Nov. 29, 2020 | Feb. 23, 2020 | Feb. 28, 2021 | Feb. 23, 2020 | Aug. 30, 2020 | May 31, 2020 | Nov. 24, 2019 | Aug. 25, 2019 | May 26, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Period to hedge portion of anticipated consumption of commodity inputs (up to) |  |  |  | 36 months |  |  |  |  |  |
Gain recognized in other comprehensive income | $ 0.6 |  | $ (0.3) | $ 1.1 | $ (3.0) |  |  |  |  |
Deferred gain in AOCI upon settlement of contracts | 8,329.8 | $ 8,469.5 | $ 7,863.9 | 8,329.8 | $ 7,863.9 | $ 8,199.0 | $ 7,950.7 | $ 7,690.6 | $ 7,516.8 | $ 7,463.7
Setoff amounts applied against total derivative assets | 1.6 |  |  | 1.6 |  |  | 0.4 |  |  |
Setoff amounts applied against total derivative liabilities | 1.5 |  |  | 1.5 |  |  | 1.5 |  |  |
Level 2 |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum amount of loss due to credit risk of counterparties | 3.2 |  |  | 3.2 |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Amounts representing a right to reclaim cash collateral |  |  |  |  |  |  | 1.1 |  |  |
Amounts representing an obligation to return cash collateral | 0.1 |  |  | 0.1 |  |  |  |  |  |
Cash flow hedge, Pinnacle |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Gain recognized in other comprehensive income |  |  |  | 47.5 |  |  |  |  |  |
Early retirement debt |  | $ 0.5 |  |  |  |  |  |  |  |
Commodity contracts | Purchase contracts |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Notional value of contracts | 55.0 |  |  | 55.0 |  |  | 102.0 |  |  |
Commodity contracts | Sales contracts |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Notional value of contracts | 45.2 |  |  | 45.2 |  |  | 3.4 |  |  |
Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Notional value of contracts | 104.4 |  |  | 104.4 |  |  | 107.6 |  |  |
Derivative adjustments, net of reclassification adjustments |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred gain in AOCI upon settlement of contracts | 24.9 |  |  | 24.9 |  |  | $ 26.3 |  |  |
Derivative adjustments, net of reclassification adjustments | Cash flow hedge, Pinnacle |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred gain in AOCI upon settlement of contracts | $ 39.0 |  |  | $ 39.0 |  |  |  |  |  |

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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5708775-113959 + Details
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