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Debt
3 Months Ended
Mar. 31, 2013
Debt [Abstract]  
Debt
14.   Debt
 
As of March 31, 2013 and December 31, 2012, AllianceBernstein had $382.6 million and $323.2 million, respectively, in commercial paper outstanding with weighted average interest rates of approximately 0.4% and 0.5%, respectively. The commercial paper is short term in nature, and as such, recorded value is estimated to approximate fair value. Average daily borrowings of commercial paper during the first three months of 2013 and the full year 2012 were $455.7 million and $404.9 million, respectively, with weighted average interest rates of approximately 0.4% for both periods.