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Payroll, staff and employee benefits obligations - Actuarial assumptions (Details)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension benefits      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 1.84% 2.68% 2.48%
Inflation rate (as a percent) 2.20% 2.44% 2.40%
Pension benefits | Euro zone      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 0.73% 1.72% 1.71%
Inflation rate (as a percent) 1.21% 1.50% 1.50%
Pension benefits | United States      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 3.25% 4.00% 3.75%
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) 2.25% 3.00% 2.50%
Inflation rate (as a percent) 3.25% 3.50% 3.50%
Other benefits      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 1.71% 2.56% 2.52%
Other benefits | Euro zone      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 0.94% 1.87% 1.93%
Other benefits | United States      
Assumptions used to determine benefits obligations      
Discount rate (as a percent) 3.25% 4.00% 3.75%