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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property, plant and equipment, net | $ 101.5 |  | $ 101.5 |  | $ 106.9
Net sales | 107.1 | $ 129.1 | 344.0 | $ 377.0 |
Top five countries |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Net sales | 78.7 | 101.7 | 258.8 | 293.4 |
United States |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property, plant and equipment, net | 58.2 |  | 58.2 |  | 66.1
Net sales | 58.0 | 67.2 | 182.4 | 195.4 |
United Kingdom |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property, plant and equipment, net | 38.3 |  | 38.3 |  | 36.0
Net sales | 7.9 | 13.1 | 28.5 | 36.5 |
Germany |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Net sales | 4.2 | 10.6 | 18.2 | 31.6 |
Italy |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Net sales | 5.1 | 6.9 | 16.8 | 17.0 |
France |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Net sales | 3.5 | 3.9 | 12.9 | 12.9 |
Rest of Europe |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property, plant and equipment, net | 1.0 |  | 1.0 |  | 1.1
Net sales | 8.6 | 7.7 | 30.5 | 25.1 |
Asia Pacific |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property, plant and equipment, net | 0.3 |  | 0.3 |  | 0.3
Net sales | 13.0 | 14.3 | 37.3 | 40.7 |
Other |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property, plant and equipment, net | 3.7 |  | 3.7 |  | $ 3.4
Net sales | $ 6.8 | $ 5.4 | $ 17.4 | $ 17.8 |
Geographic Concentration Risk | Revenue from Contract with Customer | Top five countries |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Concentration risk, percentage | 73.60% | 78.80% | 75.20% | 77.80% |
Geographic Concentration Risk | Revenue from Contract with Customer | United States |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Concentration risk, percentage | 54.10% | 52.10% | 52.90% | 51.80% |
Geographic Concentration Risk | Revenue from Contract with Customer | United Kingdom |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Concentration risk, percentage | 7.40% | 10.10% | 8.30% | 9.70% |
Geographic Concentration Risk | Revenue from Contract with Customer | Germany |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Concentration risk, percentage | 3.90% | 8.20% | 5.30% | 8.40% |
Geographic Concentration Risk | Revenue from Contract with Customer | Italy |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Concentration risk, percentage | 4.80% | 5.30% | 4.90% | 4.50% |
Geographic Concentration Risk | Revenue from Contract with Customer | France |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Concentration risk, percentage | 3.30% | 3.00% | 3.80% | 3.40% |
Geographic Concentration Risk | Revenue from Contract with Customer | Rest of Europe |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Concentration risk, percentage | 8.00% | 6.00% | 8.90% | 6.70% |
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Concentration risk, percentage | 12.10% | 11.10% | 10.80% | 10.80% |
Geographic Concentration Risk | Revenue from Contract with Customer | Other |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Concentration risk, percentage | 6.30% | 4.20% | 5.10% | 4.70% |

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