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Share Plans - Schedule of Share-based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |
Total share-based compensation charges | $ 0.8 | $ 0.6 | $ 2.1 | $ 4.0

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