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Pension Benefits - Assumptions (Details)
Dec. 31, 2019
Dec. 31, 2018
Minimum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.85% 7.25%
Rate of increase in compensation level 5.00% 5.00%
Maximum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 10.42% 12.17%
Rate of increase in compensation level 7.00% 7.00%