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Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of detailed information about intangible assets [abstract]  
Disclosure of reconciliation of changes in intangible assets
 
 
Goodwill
 
Customer
related
 
Technology
and trading
related
 
Development
costs
 
Software
 
Total
 
 
 
$M
 
$M
 
$M
 
$M
 
$M
 
$M
 
 
Cost:
 

 
 

 
 

 
 

 
 

 
 

 
 
At January 1, 2016
83.4

 
13.4

 
9.3

 
4.0

 
3.5

 
113.6

 
 
Additions
0.1

 
0.1

 
—

 
2.4

 
0.1

 
2.7

 
 
Disposals
—

 
—

 
—

 
—

 
(0.6
)
 
(0.6
)
 
 
Exchange difference
(8.2
)
 
—

 
(1.3
)
 
(0.4
)
 
(0.3
)
 
(10.2
)
 
 
At December 31, 2016
75.3

 
13.5

 
8.0

 
6.0

 
2.7

 
105.5

 
 
Additions
—

 
—

 
—

 
0.9

 
0.8

 
1.7

 
 
Disposals
—

 
(0.1
)
 
—

 
—

 
(0.4
)
 
(0.5
)
 
 
Exchange difference
4.1

 
—

 
0.6

 
0.5

 
0.3

 
5.5

 
 
At December 31, 2017
79.4

 
13.4

 
8.6

 
7.4

 
3.4

 
112.2

 
 
Accumulated amortization and impairment:
 

 
 

 
 

 
 

 
 

 
 

 
 
At January 1, 2016
21.2

 
1.5

 
1.8

 
0.1

 
2.0

 
26.6

 
 
Provided during the year
—

 
0.7

 
0.4

 
0.3

 
0.3

 
1.7

 
 
Disposals
—

 
—

 
—

 
—

 
(0.3
)
 
(0.3
)
 
 
Exchange difference
(2.8
)
 
(0.1
)
 
(0.3
)
 
0.1

 
—

 
(3.1
)
 
 
At December 31, 2016
18.4

 
2.1

 
1.9

 
0.5

 
2.0

 
24.9

 
 
Provided during the year
—

 
0.9

 
0.4

 
0.7

 
0.3

 
2.3

 
 
Disposals
—

 
(0.1
)
 
—

 
—

 
(0.4
)
 
(0.5
)
 
 
Impairment
—

 
—

 
0.5

 
1.5

 
—

 
2.0

 
 
Exchange difference
1.4

 
—

 
0.2

 
0.1

 
0.1

 
1.8

 
 
At December 31, 2017
19.8

 
2.9

 
3.0

 
2.8

 
2.0

 
30.5

 
 
Net book values:
 

 
 

 
 

 
 

 
 

 
 
 
 
At December 31, 2017
59.6

 
10.5

 
5.6

 
4.6

 
1.4

 
81.7

 
 
At December 31, 2016
56.9

 
11.4

 
6.1

 
5.5

 
0.7

 
80.6

 
 
At January 1, 2016
62.2

 
11.9

 
7.5

 
3.9

 
1.5

 
87.0