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Pension Plans - Summary of Benefit Obligations in Excess of Fair Value of Plan Assets (Detail) - Pension Plan - USD ($)
$ in Millions
Dec. 28, 2019
Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation $ 231.0 $ 1,028.6
Fair value of plan assets 126.5 916.2
Projected benefit obligation 1,336.9 1,183.2
Fair value of plan assets $ 1,209.5 $ 1,007.6