Post Employment Plans - Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	1.06%	2.04%	1.91%
Inflation	1.18%	1.45%	1.45%
Expected return on assets	2.54%	2.94%	2.90%
Other Postretirement Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.25%	3.59%	3.59%