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Pension Benefits - Actuarial Assumptions for Project Benefit Obligations (Details) - Pension Plans, Defined Benefit [Member]
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount Rate 4.18% 4.47%
Rate of Increase in Future Compensation Levels 2.56% 3.15%