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Pension Plans and Other Post-Retirement Benefits - Schedule of Plan Asset Allocation (Details)	Dec. 31, 2020	Dec. 31, 2019
Employee Benefits [Abstract]
Equity investments	3.00%	3.00%
Fixed income investments	73.00%	77.00%
Real estate investments	7.00%	7.00%
Qualifying insurance contract	8.00%	8.00%
Other	9.00%	5.00%
Total composition of fair value of plan assets	100.00%	100.00%

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Employee Benefits [Abstract]

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Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

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Other Assets, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

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Real Estate, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

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