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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 89.5 | $ 116.5 | $ 193.3 | $ 236.9
Top five countries |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 69.2 | $ 87.3 | $ 148.9 | $ 180.1
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 | 77.30% | 74.90% | 77.00% | 76.00%
United States |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 50.2 | $ 63.0 | $ 109.9 | $ 124.4
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 56.10% | 54.00% | 56.80% | 52.50%
United Kingdom |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 5.7 | $ 9.1 | $ 13.1 | $ 20.6
United Kingdom | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 6.40% | 7.80% | 6.80% | 8.70%
Germany |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 4.4 | $ 5.8 | $ 8.0 | $ 14.0
Germany | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 4.90% | 5.00% | 4.10% | 5.90%
Italy |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 4.4 | $ 5.2 | $ 8.8 | $ 11.7
Italy | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 4.90% | 4.50% | 4.60% | 4.90%
France |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 4.5 | $ 4.2 | $ 9.1 | $ 9.4
France | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 5.00% | 3.60% | 4.70% | 4.00%
France |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 5.3 | $ 10.1 | $ 12.4 | $ 21.9
France | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 5.90% | 8.70% | 6.40% | 9.20%
Asia Pacific |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 10.5 | $ 12.7 | $ 22.0 | $ 24.3
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 11.80% | 10.90% | 11.40% | 10.30%
Other |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net sales | $ 4.5 | $ 6.4 | $ 10.0 | $ 10.6
Other | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 5.00% | 5.50% | 5.20% | 4.50%

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