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Share Plans - Schedule of Share-based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |
Total share-based compensation charges | $ 0.8 | $ 0.8 | $ 1.3 | $ 3.4

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