Pension Plans and Other Postretirement Benefits (Details3)	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate	5.00%	5.80%
Pension Benefits [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase	4.50%	4.50%
Pension Benefits [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase	3.00%	2.50%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate	5.00%	5.80%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase	0.00%	0.00%