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Pensions and Other Post-retirement Benefits (Details 3)	12 Months Ended
Pensions and Other Post-retirement Benefits (Details 3)	Dec. 31, 2012	Dec. 31, 2011
Assumed health care trend rates
Health care trend rate assumed for next year	8.00%	8.00%
Rate that the trend rate gradually declines to (ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2019	2019

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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