Pension Benefits - Actuarial Assumptions Pension Expense (Details) - Pension Plans, Defined Benefit [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.10%	4.90%	4.05%
Rate of Increase in Future Compensation Levels	3.31%	3.05%	3.08%
Expected Long Term Rate of Return on Plan Assets	6.75%	7.00%	7.00%