XML 93 R74.htm IDEA: XBRL DOCUMENT v3.8.0.1
Accounting policies - Property, Plant and Equipment (Details)
 12 Months Ended
Dec. 31, 2017
Freehold buildings | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 3.00%
Freehold buildings | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 10.00%
Plant and equipment | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 4.00%
Plant and equipment | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 30.00%
Heavy production equipment (including casting, rolling, extrusion and press equipment) | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 4.00%
Heavy production equipment (including casting, rolling, extrusion and press equipment) | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 6.00%
Chemical production plant and robotics | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 10.00%
Chemical production plant and robotics | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 15.00%
Other production machinery | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 10.00%
Other production machinery | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 20.00%
Furniture, fittings, storage and equipment | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 10.00%
Furniture, fittings, storage and equipment | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, rate of annual charge 30.00%