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Retirement Plans (Weighted Average Assumptions Used To Determine The Benefit Obligation) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.90%	5.50%
Rate of compensation increase	0.90%	4.00%
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.80%	5.20%
Rate of compensation increase	3.60%	3.50%
Health care cost trend, Ultimate	5.90%	6.00%
Postretirement Benefits [Member] \| Pre-Age 65 [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend, Current	7.00%	7.80%
Postretirement Benefits [Member] \| Post-Age 65 [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend, Current	7.00%	7.80%

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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