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Pensions - Actuarial assumptions (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Weighted-average duration of the defined benefit obligation 15 years 9 months 18 days 15 years 10 months 24 days
Description of Expected attrition Expected attrition at 31 December 2019 was 0.3% and 3.3% for employees between 50-59 years and 60-67 years, and 0.2% and 3.2% in 2018. The attrition rate for the age group 60-67 years represent employees with immediate withdrawal of vested pension, thus remaining in the scheme.  
Employee age group (50-59 years) [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Expected attrition rate of employees 0.30% 0.20%
Employee age group (60-67 years) [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Expected attrition rate of employees 3.30% 3.20%
Discount rate [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Assumptions used to determine benefit costs 2.75% 2.50%
Percentage Actuarial Assumption To Determine Defined Benefit Obligations 2.25% 2.75%
Rate of compensation increase [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Assumptions used to determine benefit costs 2.75% 2.25%
Percentage Actuarial Assumption To Determine Defined Benefit Obligations 2.25% 2.75%
Expected rate of pension increase [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Assumptions used to determine benefit costs 2.00% 1.75%
Percentage Actuarial Assumption To Determine Defined Benefit Obligations 1.50% 2.00%
Expected increase of social security base amount (G-amount) [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Assumptions used to determine benefit costs 2.75% 2.25%
Percentage Actuarial Assumption To Determine Defined Benefit Obligations 2.25% 2.75%