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Postretirement Health Care Plans - Net Periodic Postretirement Health Care Cost (Detail) - Other Postretirement Benefit Plans, Defined Benefit [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Postretirement Health Care Plans [Line Items]        
Interest cost $ 0.5 $ 0.5 $ 1.0 $ 1.1
Expected return on plan assets (0.2) (0.2) (0.4) (0.4)
Amortization of unrecognized loss (gain)   0.1 (0.1)  
Net periodic pension cost $ 0.3 $ 0.4 $ 0.5 $ 0.7