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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2021 | Jun. 28, 2020 | Jun. 27, 2021 | Jun. 28, 2020
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 99.0 | $ 76.6 | $ 184.2 | $ 165.0
Top five countries |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 71.6 | $ 57.9 | $ 134.2 | $ 124.5
Top five countries | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 72.30% | 75.60% | 72.90% | 75.50%
United States |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 55.7 | $ 41.2 | $ 102.4 | $ 91.5
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 56.30% | 53.90% | 55.60% | 55.50%
U.K. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 5.7 | $ 4.4 | $ 11.0 | $ 9.8
U.K. | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 5.80% | 5.70% | 6.00% | 5.90%
Germany |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 4.4 | $ 4.4 | $ 8.1 | $ 7.9
Germany | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 4.40% | 5.70% | 4.40% | 4.80%
France |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 3.4 | $ 4.5 | $ 6.7 | $ 9.1
France | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 3.40% | 5.90% | 3.60% | 5.50%
Italy |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 2.4 | $ 3.4 | $ 6.0 | $ 6.2
Italy | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 2.40% | 4.40% | 3.30% | 3.80%
Rest of Europe |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 7.0 | $ 5.3 | $ 14.1 | $ 12.3
Rest of Europe | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 7.10% | 6.90% | 7.70% | 7.50%
Asia Pacific |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 13.4 | $ 10.4 | $ 24.4 | $ 20.8
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 13.50% | 13.60% | 13.20% | 12.50%
Other |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 7.0 | $ 3.0 | $ 11.5 | $ 7.4
Other | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 7.10% | 3.90% | 6.20% | 4.50%

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