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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 29, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | $ 94.3 |  | $ 98.9
Net sales | 103.8 | $ 120.4 |
Top five countries |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 79.7 | 92.8 |
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 56.0 |  | 57.3
Net sales | 59.7 | 61.4 |
United Kingdom |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 33.7 |  | 36.7
Net sales | 7.4 | 11.5 |
Germany |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 3.6 | 8.2 |
Italy |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 4.4 | 6.5 |
France |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 4.6 | 5.2 |
Rest of Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 1.0 |  | 1.0
Net sales | 7.1 | 11.8 |
Asia Pacific |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 0.3 |  | 0.3
Net sales | 11.5 | 11.6 |
Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property, plant and equipment, net | 3.3 |  | $ 3.6
Net sales | $ 5.5 | $ 4.2 |
Geographic Concentration Risk | Revenue from Contract with Customer | Top five countries |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk, percentage | 76.80% | 77.10% |
Geographic Concentration Risk | Revenue from Contract with Customer | United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk, percentage | 57.50% | 51.00% |
Geographic Concentration Risk | Revenue from Contract with Customer | United Kingdom |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk, percentage | 7.10% | 9.60% |
Geographic Concentration Risk | Revenue from Contract with Customer | Germany |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk, percentage | 3.50% | 6.80% |
Geographic Concentration Risk | Revenue from Contract with Customer | Italy |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk, percentage | 4.20% | 5.40% |
Geographic Concentration Risk | Revenue from Contract with Customer | France |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk, percentage | 4.40% | 4.30% |
Geographic Concentration Risk | Revenue from Contract with Customer | Rest of Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk, percentage | 6.80% | 9.80% |
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk, percentage | 11.10% | 9.60% |
Geographic Concentration Risk | Revenue from Contract with Customer | Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Concentration risk, percentage | 5.30% | 3.50% |

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