Short-term Debt

3 Months Ended

Dec. 31, 2011

Short-term Debt [Abstract]

Short-term Debt

6. Short-term Debt

Our short-term debt obligations are comprised of commercial paper borrowings. Commercial paper borrowings outstanding were $350.0 million at December 31, 2011. At December 31, 2011 the weighted average interest rate and maturity period of the commercial paper outstanding were 0.33 percent and 10 days, respectively. At September 30, 2011, we had no commercial paper borrowings outstanding.