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Summary of Significant Accounting Policies (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
£ / $
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
€ / $
Dec. 31, 2018
USD ($)
£ / $
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
€ / $
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Dec. 28, 2018
Property, Plant and Equipment [Line Items]                      
Depreciation       $ 14,100,000     $ 17,800,000   $ 17,000,000.0    
Asset impairment charges, related to restructuring activities       4,600,000     6,600,000        
Impairment credit / (charges)       5,200,000              
Asset impairment charges, related to fair value adjustment in divestiture of business             3,400,000        
Impairment of review the use of long-lived assets                 1,500,000    
Impairment charges $ 5,200,000     5,000,000.0     7,200,000   $ 3,700,000    
Write-off in relation to the acquisition of GTM       2,400,000              
Goodwill impairment       1,300,000     1,300,000        
Restricted cash 100,000 $ 100,000 $ 100,000 100,000 $ 100,000 $ 300,000 300,000 $ 300,000      
Average foreign currency exchange rate, translation     0.7820   0.8943 0.7509   0.8472      
Increase of average foreign currency exchange rate, translation     0.05   0.05            
Right-of-use assets from operating leases 14,800,000 14,800,000 $ 14,800,000 14,800,000 $ 14,800,000 $ 18,400,000 18,400,000 $ 18,400,000   $ 21,200,000  
Other current liabilities 3,300,000 3,300,000 3,300,000 3,300,000 3,300,000 3,500,000 3,500,000 3,500,000   3,100,000  
Other non-current liabilities $ 11,700,000 $ 11,700,000 $ 11,700,000 $ 11,700,000 $ 11,700,000 14,900,000 14,900,000 14,900,000   $ 18,100,000  
Minimum                      
Property, Plant and Equipment [Line Items]                      
Incremental borrowing rate term   1 year                  
Maximum                      
Property, Plant and Equipment [Line Items]                      
Incremental borrowing rate term   30 years                  
Machinery and equipment | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   3 years                  
Machinery and equipment | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   25 years                  
Freehold buildings | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   10 years                  
Freehold buildings | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   33 years                  
Heavy production equipment (including casting, rolling, extrusion and press equipment) | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   20 years                  
Heavy production equipment (including casting, rolling, extrusion and press equipment) | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   25 years                  
Chemical production plant and robotics | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   7 years                  
Chemical production plant and robotics | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   10 years                  
Other production machinery | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   5 years                  
Other production machinery | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   10 years                  
Furniture, fittings, storage and equipment | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   3 years                  
Furniture, fittings, storage and equipment | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   10 years                  
Computer software | Minimum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   4 years                  
Computer software | Maximum                      
Property, Plant and Equipment [Line Items]                      
Property, plant and equipment, useful life   7 years                  
Customer relationships | Minimum                      
Property, Plant and Equipment [Line Items]                      
Intangible asset, useful life   10 years                  
Customer relationships | Maximum                      
Property, Plant and Equipment [Line Items]                      
Intangible asset, useful life   15 years                  
Technology and trading related | Minimum                      
Property, Plant and Equipment [Line Items]                      
Intangible asset, useful life   5 years                  
Technology and trading related | Maximum                      
Property, Plant and Equipment [Line Items]                      
Intangible asset, useful life   25 years                  
Luxfer Uttam India Private Limited | Variable Interest Entity, Not Primary Beneficiary                      
Property, Plant and Equipment [Line Items]                      
VIEs ownership percentage 51.00% 51.00% 51.00% 51.00% 51.00%            
Nikkei-MEL Co. Limited                      
Property, Plant and Equipment [Line Items]                      
VIEs ownership percentage 50.00% 50.00% 50.00% 50.00% 50.00%            
Sub161 Pty Limited | Variable Interest Entity, Not Primary Beneficiary                      
Property, Plant and Equipment [Line Items]                      
VIEs ownership percentage 26.40% 26.40% 26.40% 26.40% 26.40%            
Luxfer Holdings NA, LLC | Variable Interest Entity, Not Primary Beneficiary                      
Property, Plant and Equipment [Line Items]                      
VIEs ownership percentage                     49.00%
Escrow to disburse environmental liabilities                      
Property, Plant and Equipment [Line Items]                      
Restricted cash $ 100,000 $ 100,000 $ 100,000 $ 100,000 $ 100,000 $ 300,000 300,000 $ 300,000      
GBP                      
Property, Plant and Equipment [Line Items]                      
Effect of exchange rate on revenue during the year       6,100,000              
Effect of exchange rate on operating income during the year       1,600,000              
Effect of exchange on revenue per 0.05 increase in foreign exchange rate       10,600,000              
Effect of exchange on operating income per 0.05 increase in foreign exchange rate       100,000              
Euro                      
Property, Plant and Equipment [Line Items]                      
Effect of exchange rate on revenue during the year       200,000              
Effect of exchange rate on operating income during the year       600,000              
Effect of exchange on revenue per 0.05 increase in foreign exchange rate       200,000              
Effect of exchange on operating income per 0.05 increase in foreign exchange rate       $ (1,100,000)              
Measurement Input, Long-term Revenue Growth Rate                      
Property, Plant and Equipment [Line Items]                      
Goodwill impairment test, measurement input 0.023 0.023 0.023 0.023 0.023            
Measurement Input, Discount Rate | Minimum                      
Property, Plant and Equipment [Line Items]                      
Goodwill impairment test, measurement input 0.083 0.083 0.083 0.083 0.083            
Measurement Input, Discount Rate | Maximum                      
Property, Plant and Equipment [Line Items]                      
Goodwill impairment test, measurement input 0.090 0.090 0.090 0.090 0.090            
Held-for-sale | Magnesium Elektron CZ s.r.o. Subsidiary                      
Property, Plant and Equipment [Line Items]                      
Adjustment in relation to the sale of business       $ 200,000     $ 3,400,000