Postretirement Plans - Summary of Change in Fair Value of Plan Assets (Detail) - U.S. Postretirement Health Care Plans - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 13.3	$ 12.8
Actual gain on plan assets	1.1	1.4
Employer contributions	2.7	2.5
Plan participant contributions	0.2	0.2
Benefits paid	(3.6)	(3.6)
Fair value of plan assets at end of year	13.7	13.3
Funded (unfunded) status at end of year	$ (33.8)	$ (37.3)