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Segmental Information - Geographic information by region (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 29, 2024
Oct. 01, 2023
Sep. 29, 2024
Oct. 01, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 99.4 $ 97.4 $ 288.5 $ 309.1
Top five countries        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 79.4 $ 76.4 $ 228.6 $ 238.8
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 79.80% 78.50% 79.20% 77.20%
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 57.7 $ 59.0 $ 168.2 $ 184.5
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 58.10% 60.70% 58.30% 59.70%
Germany        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 5.8 $ 4.7 $ 18.4 $ 14.8
Germany | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 5.80% 4.80% 6.40% 4.80%
United Kingdom        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 7.4 $ 4.3 $ 18.0 $ 15.1
United Kingdom | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 7.40% 4.40% 6.20% 4.90%
Japan        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 5.7 $ 5.1 $ 14.7 $ 15.9
Japan | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 5.70% 5.20% 5.10% 5.10%
Canada        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 2.8 $ 3.3 $ 9.3 $ 8.5
Canada | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 2.80% 3.40% 3.20% 2.70%
Rest of Europe        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 12.1 $ 10.8 $ 36.5 $ 35.5
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 12.30% 11.10% 12.70% 11.50%
Asia Pacific        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 5.8 $ 4.9 $ 16.1 $ 22.2
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 5.80% 5.00% 5.60% 7.20%
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 2.1 $ 5.3 $ 7.3 $ 12.6
Other | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 2.10% 5.40% 2.50% 4.10%