This excerpt taken from the ACI 10-K filed Mar 1, 2010.
On August 15, 2007, the Company entered into a commercial paper placement program, as amended, to provide short-term financing at rates that are generally lower than the rates available under the revolving credit facility. Under the commercial paper program, the Company may sell interest-bearing or discounted short-term unsecured debt obligations with maturities of no more than 270 days. Market conditions have impacted the Companys ability to issue commercial paper. The Company amended the program on April 11, 2008 to increase the maximum aggregate principal amount outstanding to $100.0 million from $75.0 million. The commercial paper placement program is supported by a revolving credit facility, which is subject to renewal annually, and expires on April 30, 2010. As of December 31, 2009, the weighted-average interest rate of the Companys outstanding commercial paper was 1.44% and maturity dates ranged from 4 to 55 days.