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Pension Benefits - Actuarial Assumptions Pension Expense (Details) (Pension Plans, Defined Benefit [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.60%	5.35%	6.00%
Rate of Increase in Future Compensation Levels	3.27%	2.47%	2.88%
Expected Long Term Rate of Return on Plan Assets	7.00%	7.00%	7.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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