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Segmental Information - Geographic Information by Region (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 27, 2020
Jun. 28, 2020
Mar. 29, 2020
Dec. 31, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales $ 82.1 $ 77.7 $ 76.6 $ 88.4 $ 82.3 $ 90.8 $ 98.0 $ 102.3 $ 324.8 $ 373.4 $ 401.9
Property, plant and equipment, net 86.0       90.2       86.0 90.2  
Top five countries                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 238.1 276.3 304.9
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 173.0 201.4 205.5
Property, plant and equipment, net 44.3       48.6       44.3 48.6  
U.K.                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 18.7 23.9 28.6
Property, plant and equipment, net 36.6       36.7       36.6 36.7  
Germany                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 15.7 21.8 41.8
Italy                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 10.5 13.3 12.6
France                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 20.2 15.9 16.4
Canada                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Property, plant and equipment, net 3.7       3.6       3.7 3.6  
Rest of Europe                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 25.4 37.7 32.7
Property, plant and equipment, net 1.1       1.0       1.1 1.0  
Asia Pacific                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 45.2 42.8 48.0
Property, plant and equipment, net $ 0.3       $ 0.3       0.3 0.3  
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 $ 16.1 $ 16.6 $ 16.3
Geographic Concentration Risk | Revenue from Contract with Customer | Top five countries                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales, percent                 73.30% 74.00% 75.90%
Geographic Concentration Risk | Revenue from Contract with Customer | United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales, percent                 53.30% 53.90% 51.20%
Geographic Concentration Risk | Revenue from Contract with Customer | U.K.                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales, percent                 5.80% 6.40% 7.10%
Geographic Concentration Risk | Revenue from Contract with Customer | Germany                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales, percent                 4.80% 5.80% 10.40%
Geographic Concentration Risk | Revenue from Contract with Customer | Italy                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales, percent                 3.20% 3.60% 3.10%
Geographic Concentration Risk | Revenue from Contract with Customer | France                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales, percent                 6.20% 4.30% 4.10%
Geographic Concentration Risk | Revenue from Contract with Customer | Rest of Europe                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales, percent                 7.80% 10.10% 8.10%
Geographic Concentration Risk | Revenue from Contract with Customer | Asia Pacific                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales, percent                 13.90% 11.50% 11.90%
Geographic Concentration Risk | Revenue from Contract with Customer | Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales, percent                 5.00% 4.40% 4.10%