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Other Income (Expense) - Net - Computation of Other Income (Expense) - Net (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Other Income and Expenses [Abstract]        
Interest income $ 0.2 $ 0.1 $ 0.3 $ 0.2
Net foreign exchange loss (0.3) (2.0) (2.4) (3.7)
Net periodic pension and postretirement benefits (costs) – non-service 0.8 0.0 1.4 (0.7)
Settlement of treasury lock 0.0 0.0 13.3 0.0
Loss on early extinguishment of debt 0.0 0.0 (7.8) 0.0
Other (1.3) 0.0 (2.6) (0.1)
Total other income (expense) – net $ (0.6) $ (1.9) $ 2.2 $ (4.3)