Weighted Average Assumptions Used to Determine Benefit Obligation (Details)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.20%	4.15%	4.90%
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.05%	4.05%	4.95%