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Benefits - Amounts recognized in balance sheet (Details) - USD ($) $ in Millions | Dec. 01, 2024 | Nov. 26, 2023
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Pension plans, defined benefit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets for Plan Benefits, Defined Benefit Plan | $ 107.4 | $ 87.6
Accrued benefit liability – current portion(2) | (10.3) | (10.3)
Accrued benefit liability – long-term portion(2) | (110.1) | (107.3)
Amount recognized in balance sheet | (13.0) | (30.0)
Accumulated other comprehensive loss: |  |
Net actuarial loss | (201.6) | (217.5)
Net prior service benefit | 0.0 | 0.1
Other comprehensive income (loss) | (201.6) | (217.4)
Other postretirement benefit plans, defined benefit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets for Plan Benefits, Defined Benefit Plan | 0.0 | 0.0
Accrued benefit liability – current portion(2) | (5.0) | (5.6)
Accrued benefit liability – long-term portion(2) | (30.8) | (33.6)
Amount recognized in balance sheet | (35.8) | (39.2)
Accumulated other comprehensive loss: |  |
Net actuarial loss | 0.0 | 0.6
Net prior service benefit | 0.0 | 0.0
Other comprehensive income (loss) | $ 0.0 | $ 0.6

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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