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Retirement Benefits (Schedule Of Defined Benefit Plan Weighted Average Assumption Used In Calculating Net Periodic Benefit Cost) (Details)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Pension Benefits [Member]
Expected return on plan assets	8.20%	8.10%
Discount rate	5.60%	6.00%
Rate of compensation increase	4.10%	4.20%
Postretirement Benefits [Member]
Expected return on plan assets
Discount rate	5.80%	6.30%
Rate of compensation increase

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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