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Segmental Information - Reconciliation of consolidated segment income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 29, 2020 | Mar. 31, 2019
Segment Reporting [Abstract] |  |
Adjusted EBITDA | $ 15.1 | $ 18.5
Other share-based compensation charges | (0.5) | (2.6)
Depreciation and amortization | (3.6) | (3.7)
Restructuring charges | (2.8) | (9.0)
Impairment charges | 0.0 | 0.2
Acquisition related costs | (0.2) | (4.6)
Defined benefits pension pension credit | 1.1 | 0.6
Interest expense, net | (1.2) | (1.1)
Provision for income taxes | (1.7) | (2.1)
Net income / (loss) | $ 6.2 | $ (3.8)

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