Pensions and Postretirement Benefits (Summary of Pension Plan Weighted-Average Asset Allocation) (Details)	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Weighted-average asset allocations	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	59.20%	57.60%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	25.50%	26.50%
Other
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	15.30%	15.90%
Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	45.00%
Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	20.00%
Minimum | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	75.00%
Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	40.00%
Maximum | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation	20.00%