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Staff Costs - Average monthly number of employees (Details) - employee
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of products and services [line items]      
Average number of employees 1,658 1,687 1,706
Production and distribution      
Disclosure of products and services [line items]      
Average number of employees 1,397 1,381 1,432
Sales and administration      
Disclosure of products and services [line items]      
Average number of employees 204 246 218
Research and development      
Disclosure of products and services [line items]      
Average number of employees 57 60 56