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Postretirement Plans - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Jan. 02, 2021 | Dec. 28, 2019
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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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