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Pension and other Post Retirement Plans - Investment Strategy and Allocation (Details) - Defined benefit pension plan
12 Months Ended
Dec. 31, 2021
Defined Benefit Plan, Plan Assets, Category [Line Items]  
Investments for long-term growth (as a percent) 97.00%
Investments for near term benefit payments (as a percent) 3.00%
Maximum  
Defined Benefit Plan, Plan Assets, Category [Line Items]  
Securities purchased in a portfolio (as a percent) 5.00%
Market value of issuer (as a percent) 8.00%
Securities less than A quality (as a percent) 13.00%
Mortgage and asset backed securities (as a percent) 10.00%