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Pensions and Other Employee Benefits Plans (Assumptions Used to Determine Net Periodic Cost) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pensions and Other Employee Benefit Plans [Abstract]    
Discount rate 3.25% 4.25%
Expected return on plan assets 7.00% 7.25%
Rate of compensation increase 4.25% 4.25%