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Summary of Significant Accounting Policies (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
£ / $
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
€ / $
Dec. 31, 2017
USD ($)
£ / $
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
€ / $
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Dec. 28, 2018
Dec. 27, 2018
Dec. 31, 2015
Property, Plant and Equipment [Line Items]                          
Goodwill impairment       $ 1,300,000                  
Percentage of equity interest acquired                         26.40%
Depreciation       17,800,000     $ 17,000,000   $ 17,000,000        
Asset impairment charges, related to restructuring activities       6,600,000     1,300,000            
Asset impairment charges, related to fair value adjustment in divestiture of business       3,400,000     0            
Impairment of review the use of long-lived assets             1,500,000            
Asset impairment charges $ 7,200,000     13,900,000     5,900,000   $ 0        
Write-off in relation to the acquisition of GTM       2,400,000                  
Restricted cash $ 300,000 $ 300,000 $ 300,000 $ 300,000 $ 300,000 $ 700,000 700,000 $ 700,000          
Average foreign currency exchange rate, translation     0.7509   0.8472 0.7682   0.8788          
Increase of average foreign currency exchange rate, translation     0.05   0.05                
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                      
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                      
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                          
Property, Plant and Equipment [Line Items]                          
Percentage of equity interest acquired                     51.00%    
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 $ 300,000 $ 300,000 $ 300,000 $ 300,000 $ 300,000 $ 400,000 400,000 $ 400,000          
Escrow related to deferred consideration for acquisition                          
Property, Plant and Equipment [Line Items]                          
Restricted cash           $ 300,000 $ 300,000 $ 300,000          
GBP                          
Property, Plant and Equipment [Line Items]                          
Effect of exchange rate on revenue during the year       2,500,000                  
Effect of exchange rate on operating income during the year       200,000                  
Effect of exchange on revenue per 0.05 increase in foreign exchange rate       6,400,000                  
Effect of exchange on operating income per 0.05 increase in foreign exchange rate       500,000                  
Euro                          
Property, Plant and Equipment [Line Items]                          
Effect of exchange rate on revenue during the year       800,000                  
Effect of exchange rate on operating income during the year       100,000                  
Effect of exchange on revenue per 0.05 increase in foreign exchange rate       1,100,000                  
Effect of exchange on operating income per 0.05 increase in foreign exchange rate       $ 0                  
Subsequent Event | Accounting Standards Update 2016-02                          
Property, Plant and Equipment [Line Items]                          
Lease assets                   $ 15,600,000      
Lease liabilities                   $ 15,600,000      
Measurement Input, Long-term Revenue Growth Rate [Member]                          
Property, Plant and Equipment [Line Items]                          
Goodwill impairment test, measurement input 0.022 0.022 0.022 0.022 0.022                
Measurement Input, Discount Rate [Member] | Minimum                          
Property, Plant and Equipment [Line Items]                          
Goodwill impairment test, measurement input 0.064 0.064 0.064 0.064 0.064                
Measurement Input, Discount Rate [Member] | Maximum                          
Property, Plant and Equipment [Line Items]                          
Goodwill impairment test, measurement input 0.091 0.091 0.091 0.091 0.091                
Held-for-sale | Magnesium Elektron CZ s.r.o. Subsidiary                          
Property, Plant and Equipment [Line Items]                          
Adjustment in relation to the sale of business       $ (3,400,000)