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Defined Benefit Plans - Reconciliation of Level Three Measurements (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 27, 2025 | Dec. 28, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | $ 177.1 |
Ending balance | 188.3 | $ 177.1
Group annuity/insurance contracts |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | 0.0 | 26.8
Purchases | 139.3 | 0.0
Losses on assets during the period | 0.0 | (0.6)
Sale/Settlement | 0.0 | (26.2)
Ending balance | $ 139.3 | $ 0.0

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