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Other Income (Expense) - Net - Computation of Other Income (Expense) - Net (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 30, 2017 | Dec. 31, 2016
Other Income and Expenses [Abstract] |  |  |  |  |  |
Interest income | $ 0.1 | $ 0.0 | $ 0.4 | $ 0.2 |  |
Net foreign exchange loss | (1.8) | (2.0) | (4.2) | (5.7) |  |
Net periodic pension and postretirement benefits (costs) – non-service | 1.3 | 0.4 | 2.7 | (0.3) |  |
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 | (0.6) | (0.1) | (3.2) | (0.2) |  |
Total other income (expense) – net | $ (1.0) | $ (1.7) | $ 1.2 | $ (6.0) | $ (7.8) | $ (7.5)

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