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Segmental Information - Geographic information by region (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 99.5 | $ 107.1 | $ 116.5 | $ 120.4 | $ 110.9 | $ 129.1 | $ 128.2 | $ 119.7 | $ 443.5 | $ 487.9 | $ 441.3
Property, plant and equipment, net | 98.9 |  |  |  | 106.9 |  |  |  | 98.9 | 106.9 | 129.1
Top five countries |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 336.0 | 379.1 | 336.3
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 239.4 | 249.2 | 224.1
Property, plant and equipment, net | 57.3 |  |  |  | 66.1 |  |  |  | 57.3 | 66.1 | 75.4
U.K. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 35.5 | 47.6 | 40.4
Property, plant and equipment, net | 36.7 |  |  |  | 36.0 |  |  |  | 36.7 | 36.0 | 36.6
Germany |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 22.0 | 42.0 | 36.8
Italy |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 22.6 | 23.3 | 19.0
France |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 16.5 | 17.0 | 16.0
Rest of Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 38.4 | 33.2 | 31.1
Property, plant and equipment, net | 1.0 |  |  |  | 1.1 |  |  |  | 1.0 | 1.1 | 13.1
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 47.6 | 53.0 | 47.5
Property, plant and equipment, net | 0.3 |  |  |  | 0.3 |  |  |  | 0.3 | 0.3 | 0.2
Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 21.5 | 22.6 | 26.4
Property, plant and equipment, net | $ 3.6 |  |  |  | $ 3.4 |  |  |  | $ 3.6 | $ 3.4 | $ 3.8
Geographic Concentration Risk | Revenue from Contract with Customer | Top five countries |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, percent |  |  |  |  |  |  |  |  | 75.80% | 77.70% | 76.20%
Geographic Concentration Risk | Revenue from Contract with Customer | United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, percent |  |  |  |  |  |  |  |  | 54.00% | 51.10% | 50.80%
Geographic Concentration Risk | Revenue from Contract with Customer | U.K. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, percent |  |  |  |  |  |  |  |  | 8.00% | 9.80% | 9.20%
Geographic Concentration Risk | Revenue from Contract with Customer | Germany |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, percent |  |  |  |  |  |  |  |  | 5.00% | 8.60% | 8.30%
Geographic Concentration Risk | Revenue from Contract with Customer | Italy |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, percent |  |  |  |  |  |  |  |  | 5.10% | 4.80% | 4.30%
Geographic Concentration Risk | Revenue from Contract with Customer | France |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, percent |  |  |  |  |  |  |  |  | 3.70% | 3.40% | 3.60%
Geographic Concentration Risk | Revenue from Contract with Customer | Rest of Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, percent |  |  |  |  |  |  |  |  | 8.70% | 6.80% | 7.00%
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, percent |  |  |  |  |  |  |  |  | 10.70% | 10.90% | 10.80%
Geographic Concentration Risk | Revenue from Contract with Customer | Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, percent |  |  |  |  |  |  |  |  | 4.80% | 4.60% | 6.00%

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