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Acquisitions and disposals - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 28, 2018
Dec. 05, 2017
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 27, 2018
Business Acquisition [Line Items]                
Acquisition related (costs) / credits         $ (1,400,000) $ (4,300,000) $ 1,300,000  
Reimbursement of costs         3,500,000      
Remeasurement of deferred contingent consideration         $ 100,000      
Percentage of equity interest acquired       26.40% 26.40%      
Goodwill $ 67,600,000     $ 68,800,000 $ 68,800,000 67,600,000 71,200,000  
Equity investments fair value               $ 1,600,000
Impairment charges       5,200,000 5,000,000.0 7,200,000 3,700,000  
Acquisition-related costs         900,000      
Business combination, contingent consideration deferred (900,000)     (500,000) (500,000) (900,000)    
Remeasurement of deferred consideration (recognized in acquisition-related costs)         100,000 900,000    
Business combination, contingent consideration, liability, deferred, net         200,000 200,000 $ 200,000  
Business combination, undiscounted future payment, current 900,000     500,000 500,000 $ 900,000    
Maximum undiscounted amount payable       $ 10,000,000.0 10,000,000.0      
Luxfer Holdings NA, LLC                
Business Acquisition [Line Items]                
Consideration of disposal   $ 2,200,000            
Amount of debt instrument forgiveness   2,100,000            
Fair value of net assets of acquiree   4,000,000.0            
Fair value of net assets acquired   2,100,000            
Goodwill   0            
Cash acquired   2,700,000            
Inventory acquired   1,100,000            
Accounts and other receivables acquired   800,000            
Property, plant, and equipment acquired   200,000            
Accounts payable assumed from acquisition   800,000            
Intangible assets acquired   0            
Impairment charges   2,400,000            
Revenue of acquiree since acquisition date $ 0              
ESM Group Inc.                
Business Acquisition [Line Items]                
Fair value of net assets acquired     $ 5,800,000          
Inventory acquired     700,000          
Property, plant, and equipment acquired     3,200,000          
Consideration paid     4,300,000          
Consideration deferred     300,000          
Business combination, escrow deposit     400,000          
Bargain purchase, gain recognized     1,200,000          
Liabilities assumed form acquisition     100,000          
Acquisition-related costs     500,000          
Provisions for disbursement of environmental liabilities     400,000          
ESM Group Inc. | Land and Building                
Business Acquisition [Line Items]                
Property, plant, and equipment acquired     $ 2,000,000.0          
Luxfer Holdings NA, LLC | Gas Transport Leasing LLC                
Business Acquisition [Line Items]                
Consideration of disposal   $ 2,200,000            
Luxfer Holdings NA, LLC                
Business Acquisition [Line Items]                
Percentage of equity interest acquired   51.00%            
Variable Interest Entity, Not Primary Beneficiary | Luxfer Holdings NA, LLC                
Business Acquisition [Line Items]                
VIEs ownership percentage   49.00%            
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Magnesium Elektron CZ s.r.o. Subsidiary                
Business Acquisition [Line Items]                
Net gain on disposal         $ 2,900,000