Weighted Average Assumptions Used to Determine Benefit Obligations (Details)	Dec. 31, 2015	Dec. 31, 2014
Pension Costs
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.73%	3.54%
Rate of Compensation increase	4.31%	3.13%
Nonpension Postretirement Costs
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.11%	3.77%