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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, plant and equipment [abstract]  
Schedule of property, plant and equipment
The rate of annual charge is summarized as follows:
 
Freehold buildings
3% – 10%
 
 
Leasehold land and buildings
The lesser of life of lease or freehold rate
 
 
Plant and equipment
4% – 30%
 
 
Including:
 
 
 
Heavy production equipment (including casting, rolling, extrusion and press equipment)
4% – 6%
 
 
Chemical production plant and robotics
10% – 15%
 
 
Other production machinery
10% – 20%
 
 
Furniture, fittings, storage and equipment
10% – 30%
 
 
 
Freehold
 
Long
leasehold
 
Short
leasehold
 
Plant and
equipment
 
Total
 
 
 
$M
 
$M
 
$M
 
$M
 
$M
 
 
Cost:
 

 
 

 
 

 
 

 
 

 
 
At January 1, 2016
56.1

 
6.4

 
10.3

 
314.6

 
387.4

 
 
Additions
1.9

 
0.6

 
0.5

 
13.5

 
16.5

 
 
Disposals
(3.8
)
 
—

 
—

 
(23.0
)
 
(26.8
)
 
 
Transfers
3.8

 
(0.2
)
 
—

 
(3.6
)
 
—

 
 
Exchange difference
(1.6
)
 
(0.9
)
 
(0.3
)
 
(25.3
)
 
(28.1
)
 
 
At December 31, 2016
56.4

 
5.9

 
10.5

 
276.2

 
349.0

 
 
Additions
0.9

 
0.3

 
0.9

 
7.1

 
9.2

 
 
Acquired via acquisition
2.0

 
—

 
—

 
3.2

 
5.2

 
 
Disposals
(0.1
)
 
(0.1
)
 
—

 
(4.7
)
 
(4.9
)
 
 
Exchange difference
3.2

 
0.1

 
0.8

 
14.2

 
18.3

 
 
At December 31, 2017
62.4

 
6.2

 
12.2

 
296.0

 
376.8

 
 
Accumulated depreciation and impairment:
 

 
 

 
 

 
 

 
 

 
 
At January 1, 2016
20.1

 
3.9

 
4.7

 
222.7

 
251.4

 
 
Provided during the year
2.0

 
0.3

 
0.8

 
13.6

 
16.7

 
 
Disposals
(2.8
)
 
—

 
—

 
(22.8
)
 
(25.6
)
 
 
Transfers
7.9

 
(0.5
)
 
0.2

 
(7.6
)
 
—

 
 
Exchange difference
(0.6
)
 
(0.6
)
 
(0.2
)
 
(20.0
)
 
(21.4
)
 
 
At December 31, 2016
26.6

 
3.1

 
5.5

 
185.9

 
221.1

 
 
Provided during the year
2.2

 
0.3

 
0.9

 
13.3

 
16.7

 
 
Disposals
(0.1
)
 
(0.1
)
 
—

 
(4.5
)
 
(4.7
)
 
 
Impairment
2.5

 
—

 
—

 
2.5

 
5.0

 
 
Exchange difference
1.3

 
0.2

 
0.3

 
11.4

 
13.2

 
 
At December 31, 2017
32.5

 
3.5

 
6.7

 
208.6

 
251.3

 
 
Net book values:
 

 
 

 
 

 
 

 
 
 
 
At December 31, 2017
29.9

 
2.7

 
5.5

 
87.4

 
125.5

 
 
At December 31, 2016
29.8

 
2.8

 
5.0

 
90.3

 
127.9

 
 
At January 1, 2016
36.0

 
2.5

 
5.6

 
91.9

 
136.0