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Restructuring Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 4.3 $ 2.6 $ 7.9 $ 24.3
COVID-19 Pandemic        
Restructuring Cost and Reserve [Line Items]        
Employee benefits expense 1.0      
Luxfer Gas Cylinders France        
Restructuring Cost and Reserve [Line Items]        
Employee benefit costs, legal and professional fees 3.3      
Other Restructuring        
Restructuring Cost and Reserve [Line Items]        
Severance and related costs 4.3 2.6 7.9 19.3
Restructuring charges 4.3 2.6 7.9 24.3
Gas Cylinders segment | Other Restructuring        
Restructuring Cost and Reserve [Line Items]        
Severance and related costs $ 3.4 $ 2.3 $ 6.8 $ 18.9