Pension and Other Post-Retirement Benefits - Weighted Average Asset Allocations of Domestic Funded Plans (Details) - UNITED STATES	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
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	53.00%
Actual plan asset allocations, salaried employees	54.60%	46.60%
Target allocation, hourly employees	31.80%
Actual plan asset allocation, hourly employees	33.70%	30.50%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation, salaried employees	43.00%
Actual plan asset allocations, salaried employees	41.40%	48.50%
Target allocation, hourly employees	65.00%
Actual plan asset allocation, hourly employees	62.80%	65.10%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation, salaried employees	4.00%
Actual plan asset allocations, salaried employees	2.90%	3.40%
Target allocation, hourly employees	3.20%
Actual plan asset allocation, hourly employees	2.50%	3.20%
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation, salaried employees	0.00%
Actual plan asset allocations, salaried employees	1.10%	1.50%
Target allocation, hourly employees	0.00%
Actual plan asset allocation, hourly employees	1.00%	1.20%