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Pensions and Other Postretirement Benefits - Pension Plan Weighted-Average Asset Allocations, By Asset Category (Details) - Pension Plan
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Actual plan asset allocations 100.00% 100.00%
Domestic equity securities    
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Actual plan asset allocations 52.00% 50.00%
International equity securities    
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Actual plan asset allocations 24.00% 24.00%
Debt securities    
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Actual plan asset allocations 22.00% 24.00%
Cash and cash equivalents    
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Actual plan asset allocations 2.00% 2.00%