Pension and Other Post-Retirement Benefits - Weighted Average Asset Allocations of Domestic Funded Plans (Details) - UNITED STATES	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Target allocation, salaried employees	100.00%
Actual plan asset allocations, salaried employees	100.00%	100.00%
Target allocation, hourly employees	100.00%
Actual plan asset allocation, hourly employees	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation, salaried employees	45.60%
Actual plan asset allocations, salaried employees	46.60%	44.10%
Target allocation, hourly employees	30.00%
Actual plan asset allocation, hourly employees	30.50%	30.30%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation, salaried employees	51.00%
Actual plan asset allocations, salaried employees	48.50%	51.80%
Target allocation, hourly employees	67.00%
Actual plan asset allocation, hourly employees	65.10%	64.90%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation, salaried employees	3.40%
Actual plan asset allocations, salaried employees	3.40%	3.90%
Target allocation, hourly employees	3.00%
Actual plan asset allocation, hourly employees	3.20%	4.70%
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation, salaried employees	0.00%
Actual plan asset allocations, salaried employees	1.50%	0.20%
Target allocation, hourly employees	0.00%
Actual plan asset allocation, hourly employees	1.20%	0.10%