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Commitments and Contingencies - Summary of Product Warranty Accrual Activity (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Warranty reserve:        
Beginning of period $ 17.5 $ 17.1 $ 17.2 $ 16.0
Additions 4.1 5.6 7.9 9.3
Usage (4.1) (3.8) (7.6) (6.4)
End of period $ 17.5 $ 18.9 $ 17.5 $ 18.9