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Pension Plans and Other Post Employment Benefit Plans Weighted Average Assumptions used to Determine Net Periodic Benefit Cost - Pension (Details) - Pension Plan
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Benefit, Discount Rate 3.19% 4.19% 3.38%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 2.60% 2.84% 4.04%
Expected long-term rate of return on plan assets 6.25% 6.24% 6.19%