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Pension Plans - Summary of Benefit Obligations in Excess of Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Jan. 02, 2016
Compensation and Retirement Disclosure [Abstract]    
Projected benefit obligation $ 1,312.1 $ 1,128.4
Accumulated benefit obligation 1,238.7 1,097.6
Fair value of plan assets $ 1,061.0 $ 906.5