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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions | Jun. 27, 2021 | Dec. 31, 2020
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | $ 90.8 | $ 86.0
U.S. |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 49.2 | 44.3
United Kingdom |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 36.7 | 36.6
Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 0.3 | 0.3
Rest of Europe |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 3.5 | 3.7
Asia Pacific |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | $ 1.1 | $ 1.1

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