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Employee Benefit Plans - Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate	4.90%	4.10%	4.80%
Expected return on plan assets	8.00%	8.25%	8.25%
Rate of compensation increase	3.00%	3.00%	4.00%
Other Post-retirement Benefits
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate	4.90%	4.10%	4.90%
Expected return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	3.00%	3.00%	4.00%
Assumed health care cost trend rates [Abstract]
Initial health care cost trend rate	7.50%	8.00%	9.00%
Ultimate rate	4.50%	4.50%	5.00%
Year ultimate rate is reached	2028	2020	2016

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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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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