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Payroll, staff and employee benefits obligations - Actuarial assumptions (Details)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension benefits      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 2.48% 2.60% 3.25%
Inflation rate (as a percent) 2.40% 2.41% 2.43%
Pension benefits | Euro zone      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 1.71% 1.69% 2.18%
Inflation rate (as a percent) 1.50% 1.50% 1.75%
Pension benefits | United States      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 3.75% 4.00% 4.25%
Inflation rate (as a percent) 2.50% 2.50% 2.50%
Pension benefits | United Kingdom      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 2.50% 2.75% 3.75%
Inflation rate (as a percent) 3.50% 3.50% 3.25%
Other benefits      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 2.52% 2.51% 3.00%
Other benefits | Euro zone      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 1.93% 1.85% 2.42%
Other benefits | United States      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 3.75% 4.00% 4.25%