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Pension Plans - Summary of Benefit Obligations in Excess of Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 30, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]    
Projected benefit obligation $ 398.7 $ 1,312.1
Accumulated benefit obligation 378.1 1,238.7
Fair value of plan assets $ 275.6 $ 1,061.0