Post Employment Plans - Expected Long-term Rate of Return (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equities
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	5.90%
Bonds
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	1.80%
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	2.50%
Other
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	1.50%
Pension plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets, percent	2.54%	2.94%	2.90%