Employee Benefit Plans - Amounts recognized in balance sheet (Details) - USD ($) $ in Millions	Nov. 27, 2022	Nov. 28, 2021
Pension plans, defined benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 75.2	$ 98.3
Accrued benefit liability – current portion(2)	(9.7)	(9.8)
Accrued benefit liability – long-term portion(2)	(109.6)	(151.4)
Amount recognized in balance sheet	(44.1)	(62.9)
Accumulated other comprehensive loss:
Net actuarial loss	(253.1)	(264.7)
Net prior service benefit	0.1	0.2
Other comprehensive income (loss)	(253.0)	(264.5)
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)	(5.7)	(6.4)
Accrued benefit liability – long-term portion(2)	(36.2)	(51.4)
Amount recognized in balance sheet	(41.9)	(57.8)
Accumulated other comprehensive loss:
Net actuarial loss	1.6	(9.0)
Net prior service benefit	0.0	0.0
Other comprehensive income (loss)	$ 1.6	$ (9.0)