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Postretirement Plans - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Jan. 02, 2021	Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items]
Retiree health care benefits	$ (127.1)	$ (122.1)
U.S. Postretirement Health Care Plans
Defined Benefit Plan Disclosure [Line Items]
Accrued benefits	(2.8)	(2.8)
Retiree health care benefits	(34.5)	(33.6)
Net liability	$ (37.3)	$ (36.4)

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- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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