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Segmental Information - Net Sales by Geographic Region (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 26, 2021
Sep. 27, 2020
Sep. 26, 2021
Sep. 27, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 91.2 $ 77.7 $ 275.4 $ 242.7
Top five countries        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 67.1 $ 55.1 $ 201.3 $ 179.7
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 73.60% 70.90% 73.10% 74.10%
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 49.4 $ 41.1 $ 151.8 $ 132.8
United States | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 54.20% 52.90% 55.10% 54.80%
U.K.        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 6.5 $ 4.1 $ 17.5 $ 13.8
U.K. | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 7.10% 5.30% 6.40% 5.70%
Germany        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 5.1 $ 3.1 $ 13.2 $ 11.0
Germany | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 5.60% 4.00% 4.80% 4.50%
France        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 2.6 $ 4.9 $ 9.3 $ 14.0
France | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 2.90% 6.30% 3.40% 5.80%
Italy        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 3.5 $ 1.9 $ 9.5 $ 8.1
Italy | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 3.80% 2.40% 3.40% 3.30%
Rest of Europe        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 4.9 $ 5.8 $ 19.0 $ 18.1
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 5.40% 7.50% 6.90% 7.50%
Asia Pacific        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 13.7 $ 12.1 $ 38.1 $ 32.9
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 15.00% 15.60% 13.80% 13.50%
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net sales $ 5.5 $ 4.7 $ 17.0 $ 12.0
Other | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage 6.00% 6.00% 6.20% 4.90%