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Revenue and segmental analysis - Schedule of reporting segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue      
Revenue to external customers $ 441.3 $ 414.8 $ 460.3
Result      
Adjusted EBITDA 61.8 55.3 62.2
Other share based compensation charges (2.2) (1.4) (1.3)
Loss on disposal of property, plant and equipment (0.1) (0.2) 0.0
Depreciation and amortization (19.0) (18.4) (18.6)
TRADING PROFIT 40.5 35.3 42.3
Profit on sale of redundant site 0.4 2.1 0.0
Changes to defined benefit pension plans (Note 5) 0.0 0.6 18.0
Restructuring and other expense (Note 5) (21.6) (2.2) (22.4)
OPERATING PROFIT 19.3 35.8 37.9
Net gain / (loss) on acquisitions and disposals 1.3 0.2 (2.0)
Net interest costs (6.7) (5.6) (6.9)
IAS 19R retirement benefits finance charge (1.8) (2.1) (3.0)
Unwind of discount on deferred contingent consideration from acquisitions 0.2 0.4 0.4
PROFIT ON OPERATIONS BEFORE TAXATION 11.9 27.9 25.6
Income tax expense (0.4) (6.0) (9.5)
NET INCOME FOR THE YEAR 11.5 21.9 16.1
Other segment information      
Segment assets 402.6 391.5 435.7
Segment liabilities (240.3) (249.6) (266.0)
Net assets / (liabilities) employed 162.3 141.9 169.7
Capital expenditure: Property, plant and equipment 9.2 16.5 15.3
Capital expenditure: Intangible assets 1.7 2.4 2.1
Gas Cylinders      
Revenue      
Revenue to external customers 220.2 225.8 239.1
Elektron      
Revenue      
Revenue to external customers 221.1 189.0 221.2
Operating segments      
Revenue      
Revenue to external customers 441.8 414.9 460.9
Operating segments | Gas Cylinders      
Revenue      
Revenue to external customers 220.2 225.8 239.1
Result      
Adjusted EBITDA 17.3 19.7 16.5
Other share based compensation charges (1.0) (0.6) (0.7)
Loss on disposal of property, plant and equipment 0.0 (0.1)  
Depreciation and amortization (7.6) (7.6) (7.2)
TRADING PROFIT 8.7 11.4 8.6
Profit on sale of redundant site 0.0 0.0  
Changes to defined benefit pension plans (Note 5)   0.0 0.0
Restructuring and other expense (Note 5) (6.6) 0.0 (21.9)
OPERATING PROFIT 2.1 11.4 (13.3)
Net gain / (loss) on acquisitions and disposals 0.0 0.0 (0.2)
Net interest costs 0.0 0.0 0.0
IAS 19R retirement benefits finance charge 0.0 0.0 0.0
Unwind of discount on deferred contingent consideration from acquisitions 0.0 0.0 0.0
PROFIT ON OPERATIONS BEFORE TAXATION 2.1 11.4 (13.5)
Other segment information      
Segment assets 150.5 146.8 158.3
Segment liabilities (22.6) (21.7) (32.3)
Net assets / (liabilities) employed 127.9 125.1 126.0
Capital expenditure: Property, plant and equipment 3.5 6.5 6.0
Capital expenditure: Intangible assets 1.4 1.5 1.2
Operating segments | Elektron      
Revenue      
Revenue to external customers 221.6 189.1 221.8
Result      
Adjusted EBITDA 44.5 35.6 45.7
Other share based compensation charges (1.2) (0.8) (0.6)
Loss on disposal of property, plant and equipment (0.1) (0.1)  
Depreciation and amortization (11.4) (10.8) (11.4)
TRADING PROFIT 31.8 23.9 33.7
Profit on sale of redundant site 0.0 0.0  
Changes to defined benefit pension plans (Note 5)   0.0 0.0
Restructuring and other expense (Note 5) (12.7) (2.2) (0.5)
OPERATING PROFIT 19.1 21.7 33.2
Net gain / (loss) on acquisitions and disposals 1.3 0.2 0.0
Net interest costs 0.0 0.0 0.0
IAS 19R retirement benefits finance charge 0.0 0.0 0.0
Unwind of discount on deferred contingent consideration from acquisitions 0.2 0.4 0.4
PROFIT ON OPERATIONS BEFORE TAXATION 20.2 21.5 32.8
Other segment information      
Segment assets 207.6 190.6 208.5
Segment liabilities (22.3) (14.2) (21.4)
Net assets / (liabilities) employed 185.3 176.4 187.1
Capital expenditure: Property, plant and equipment 5.7 10.0 9.3
Capital expenditure: Intangible assets 0.3 0.9 0.9
Inter-segment      
Revenue      
Revenue to external customers (0.5) (0.1) (0.6)
Inter-segment | Gas Cylinders      
Revenue      
Revenue to external customers 0.0 0.0 0.0
Inter-segment | Elektron      
Revenue      
Revenue to external customers (0.5) (0.1) (0.6)
Unallocated      
Revenue      
Revenue to external customers 0.0 0.0 0.0
Result      
Adjusted EBITDA 0.0 0.0 0.0
Other share based compensation charges 0.0 0.0 0.0
Loss on disposal of property, plant and equipment 0.0 0.0  
Depreciation and amortization 0.0 0.0 0.0
TRADING PROFIT 0.0 0.0 0.0
Profit on sale of redundant site 0.4 2.1  
Changes to defined benefit pension plans (Note 5)   0.6 18.0
Restructuring and other expense (Note 5) (2.3) 0.0 0.0
OPERATING PROFIT (1.9) 2.7 18.0
Net gain / (loss) on acquisitions and disposals 0.0 0.0 (1.8)
Net interest costs (6.7) (5.6) (6.9)
IAS 19R retirement benefits finance charge (1.8) (2.1) (3.0)
Unwind of discount on deferred contingent consideration from acquisitions 0.0 0.0 0.0
PROFIT ON OPERATIONS BEFORE TAXATION (10.4) (5.0) 6.3
Other segment information      
Segment assets 44.5 54.1 68.9
Segment liabilities (195.4) (213.7) (212.3)
Net assets / (liabilities) employed (150.9) (159.6) (143.4)
Capital expenditure: Property, plant and equipment 0.0 0.0 0.0
Capital expenditure: Intangible assets $ 0.0 $ 0.0 $ 0.0