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Other income/ (expense) items - Additional Information (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 05, 2017
USD ($)
Feb. 28, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
facility
Disclosure of defined benefit plans [line items]          
Profit on sale of redundant site     $ 0.4 $ 2.1 $ 0.0
Changes to defined benefit pension plans     0.0 0.6 18.0
Curtailment credit arising from changes to defined benefit pension plans     0.0 0.6 3.3
Expense of restructuring activities     12.1 0.4 21.8
Losses on litigation settlements     3.5 0.6 $ 0.5
Number of facilities closure during rationalization of operations | facility         2
Litigation costs     1.9    
Direct listing costs     2.3 0.0 $ 0.0
Non-current asset impairments     3.7 0.0 0.0
Receivable impairment provision     0.0 (1.2) 0.0
I.P.O. related share based compensation charges     0.0 0.0 (0.1)
Merger and acquisition costs     (0.9) (0.3) (2.0)
Gain on bargain purchase     1.2 0.0 0.0
Merger and acquisition related costs, excluding legal costs         1.8
Merger and acquisition legal costs         0.2
Remeasurement of deferred contingent consideration     1.0 0.5 0.0
Elektron          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     5.5    
Gas Cylinders          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     6.6    
Investment impairment | Gas Cylinders          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     2.2    
Discontinue of Advanced Oxygen System product line | Gas Cylinders          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     2.1    
Exit of Luxfer HEI business | Gas Cylinders          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     1.0    
Sales of inventory previously written-down | Gas Cylinders          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     (0.4)    
Rationalization of Magtech operations | Elektron          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     1.7    
Asset write-downs          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities         17.7
Asset write-downs | Elektron          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     1.3    
Onerous communications contract | Elektron          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     0.6    
Group-wide effort to reduce headcount and streamline management | Elektron          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     3.0    
Group-wide effort to reduce headcount and streamline management | Gas Cylinders          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     1.4    
Other rationalization costs          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities     0.4    
Redundancy costs          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities         2.2
Closure costs          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities         1.7
Legal costs          
Disclosure of defined benefit plans [line items]          
Expense of restructuring activities         0.2
Non-U.K.          
Disclosure of defined benefit plans [line items]          
Sale of deferred pensioner liabilities, amount       10.0  
Payment to certain deferred pensioners       4.9  
Curtailment credit arising from changes to defined benefit pension plans     0.0 0.6 0.0
U.K.          
Disclosure of defined benefit plans [line items]          
Actuarial gains on financial assumptions         14.9
Curtailment credit arising from changes to defined benefit pension plans     0.0 0.0 3.3
Advisory costs related to changes to defined benefit pension plans         0.2
Litigation settlement          
Disclosure of defined benefit plans [line items]          
Losses on litigation settlements   $ 1.6      
Czech | Elektron          
Disclosure of defined benefit plans [line items]          
Non-current asset impairments     2.2    
North America          
Disclosure of defined benefit plans [line items]          
Profit on sale of redundant site     0.0 0.0  
Changes to defined benefit pension plans       0.6 0.0
North America | Elektron          
Disclosure of defined benefit plans [line items]          
Non-current asset impairments     0.9    
United Kingdom          
Disclosure of defined benefit plans [line items]          
Profit on sale of redundant site     0.4 2.1  
Changes to defined benefit pension plans       $ 0.0 $ 18.0
United Kingdom | Elektron          
Disclosure of defined benefit plans [line items]          
Non-current asset impairments     0.6    
Speciality Metals business of ESM Group Inc          
Disclosure of defined benefit plans [line items]          
Merger and acquisition costs $ (0.5)   (0.5)    
Environment costs 0.4   0.4    
Consideration transferred, acquisition-date fair value     4.6    
Net assets acquired $ 5.8   5.8    
Gain on bargain purchase     $ 1.2