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Segmental Information - Geographic information by region (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net $ 93.9   $ 86.0
Net sales 85.2 $ 88.4  
Top five countries      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 62.6 66.6  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 52.7   44.3
Net sales 46.7 50.3  
United Kingdom      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 36.2   36.6
Net sales 5.3 5.4  
Germany      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 3.7 3.5  
Italy      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 3.6 2.8  
France      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 3.3 4.6  
Rest of Europe      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 1.1   1.1
Net sales 7.1 7.0  
Asia Pacific      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 0.3   0.3
Net sales 11.0 10.4  
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 3.6   $ 3.7
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 4.5 $ 4.4  
Geographic Concentration Risk | Revenue from Contract with Customer | Top five countries      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 73.50% 75.30%  
Geographic Concentration Risk | Revenue from Contract with Customer | United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 54.90% 56.80%  
Geographic Concentration Risk | Revenue from Contract with Customer | United Kingdom      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 6.20% 6.10%  
Geographic Concentration Risk | Revenue from Contract with Customer | Germany      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 4.30% 4.00%  
Geographic Concentration Risk | Revenue from Contract with Customer | Italy      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 4.20% 3.20%  
Geographic Concentration Risk | Revenue from Contract with Customer | France      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 3.90% 5.20%  
Geographic Concentration Risk | Revenue from Contract with Customer | Rest of Europe      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 8.30% 7.90%  
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 12.90% 11.80%  
Geographic Concentration Risk | Revenue from Contract with Customer | Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 5.30% 5.00%