Post Employment Plans - Expected Long-term Rate of Return (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equities
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	5.00%
Bonds
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	1.70%
Absolute return fund
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	4.00%
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	1.60%
Other
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	0.90%
Pension plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	1.76%	2.54%	2.94%