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COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 26, 2020 | Dec. 28, 2019
Long-term commitment |  |
Outstanding purchase commitments on capital projects | $ 22.8 |
Surety Bonds and Letters of Credit |  |
Outstanding letters of credit | $ 41.0 | $ 37.3
Remediation reserves |  |
Environmental reserves, discount rate (as a percent) | 0.00% |
Estimated costs to complete future remediation efforts | $ 1.9 | $ 2.0
Open Projects |  |
Surety Bonds and Letters of Credit |  |
Payment and performance bonds outstanding | 15.4 |
Completed Projects |  |
Surety Bonds and Letters of Credit |  |
Payment and performance bonds outstanding | 5.2 |
Insurance Contracts |  |
Surety Bonds and Letters of Credit |  |
Outstanding letters of credit | 33.9 |
Revenue Bonds |  |
Surety Bonds and Letters of Credit |  |
Outstanding letters of credit | $ 7.1 |

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