Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Costs
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.47%	4.28%	4.15%
Rate of Compensation increase	3.53%	3.13%	3.33%
Expected long-term rate of return on plan assets	5.53%	6.16%	5.45%
Nonpension Postretirement Costs
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.76%	4.54%	3.92%