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Pension and Other Postretirement Benefits (Details 12)	12 Months Ended
Pension and Other Postretirement Benefits (Details 12)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. Pension Benefits [Member]
Assumptions regarding net periodic pension and other postretirement benefit costs
Discount rate	5.00%	5.75%	6.00%
Expected long-term rate of return on plan assets	8.00%	8.00%	8.00%
Weighted-average rate of increases in compensation	4.00%	4.00%	4.00%
U.K. pension benefits plan [Member]
Assumptions regarding net periodic pension and other postretirement benefit costs
Discount rate	4.90%	5.40%	5.80%
Expected long-term rate of return on plan assets	5.61%	6.39%	6.00%
Other Postretirement Benefits [Member]
Assumptions regarding net periodic pension and other postretirement benefit costs
Discount rate	5.00%	5.75%	6.00%

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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