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Segmental Information - Geographic information by region (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 99.0 $ 76.6 $ 184.2 $ 165.0
Top five countries        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 71.6 $ 57.9 $ 134.2 $ 124.5
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 72.30% 75.60% 72.90% 75.50%
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 55.7 $ 41.2 $ 102.4 $ 91.5
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 56.30% 53.90% 55.60% 55.50%
U.K.        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 5.7 $ 4.4 $ 11.0 $ 9.8
U.K. | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 5.80% 5.70% 6.00% 5.90%
Germany        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 4.4 $ 4.4 $ 8.1 $ 7.9
Germany | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 4.40% 5.70% 4.40% 4.80%
France        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 3.4 $ 4.5 $ 6.7 $ 9.1
France | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 3.40% 5.90% 3.60% 5.50%
Italy        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 2.4 $ 3.4 $ 6.0 $ 6.2
Italy | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 2.40% 4.40% 3.30% 3.80%
Rest of Europe        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 7.0 $ 5.3 $ 14.1 $ 12.3
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 7.10% 6.90% 7.70% 7.50%
Asia Pacific        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 13.4 $ 10.4 $ 24.4 $ 20.8
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 13.50% 13.60% 13.20% 12.50%
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 7.0 $ 3.0 $ 11.5 $ 7.4
Other | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 7.10% 3.90% 6.20% 4.50%