Employee Benefit Plans - Defined benefit plans (Details) - USD ($) $ in Millions	12 Months Ended
	Nov. 27, 2022	Nov. 28, 2021	Nov. 29, 2020
Pension plans, defined benefit [Member]
Net periodic benefit cost (income):
Service cost	$ 3.9	$ 4.5	$ 4.1
Interest cost	22.5	19.3	30.7
Expected return on plan assets	(31.8)	(36.6)	(41.2)
Amortization of prior service benefit	0.0	(0.1)	(0.1)
Amortization of actuarial loss	8.5	10.4	13.4
Curtailment gain	0.0	0.0	(0.7)
Net settlement (gain) loss	(0.2)	0.0	14.7
Net periodic benefit (income) cost	2.9	(2.5)	20.9
Changes in accumulated other comprehensive loss:
Actuarial (gain) loss	(3.3)	(21.2)	(34.8)
Amortization of prior service benefit (cost)	0.0	0.1	0.1
Amortization of actuarial loss	(8.5)	(10.4)	(13.4)
Curtailment gain	0.0	0.0	0.7
Net settlement gain (loss)	0.2	0.0	(14.7)
Total recognized in accumulated other comprehensive loss	(11.6)	(31.5)	(62.1)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	(8.7)	(34.0)	(41.2)
Other postretirement benefit plans, defined benefit [Member]
Net periodic benefit cost (income):
Service cost	0.0	0.0	0.0
Interest cost	0.9	0.8	1.7
Expected return on plan assets	0.0	0.0	0.0
Amortization of prior service benefit	0.0	0.0	0.0
Amortization of actuarial loss	0.3	0.5	0.3
Curtailment gain	0.0	0.0	0.0
Net settlement (gain) loss	0.0	0.0	0.0
Net periodic benefit (income) cost	1.2	1.3	2.0
Changes in accumulated other comprehensive loss:
Actuarial (gain) loss	(10.2)	(3.0)	1.5
Amortization of prior service benefit (cost)	0.0	0.0	0.0
Amortization of actuarial loss	(0.3)	(0.5)	(0.3)
Curtailment gain	0.0	0.0	0.0
Net settlement gain (loss)	0.0	0.0	0.0
Total recognized in accumulated other comprehensive loss	(10.5)	(3.5)	1.2
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	$ (9.3)	$ (2.2)	$ 3.2