Short-term Debt	3 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]
Short-term Debt	Short-term Debt Our short-term debt obligations are comprised of commercial paper borrowings. Commercial paper borrowings outstanding were $251.0 million at December 31, 2013 and $179.0 million at September 30, 2013. At December 31, 2013, the weighted average interest rate and maturity period of the commercial paper outstanding were 0.18 percent and twenty-two days, respectively. At September 30, 2013, the weighted average interest rate and maturity period of the commercial paper outstanding were 0.17 percent and five days, respectively.

Short-term Debt

3 Months Ended

Dec. 31, 2013

Our short-term debt obligations are comprised of commercial paper borrowings. Commercial paper borrowings outstanding were $251.0 million at December 31, 2013 and $179.0 million at September 30, 2013. At December 31, 2013, the weighted average interest rate and maturity period of the commercial paper outstanding were 0.18 percent and twenty-two days, respectively. At September 30, 2013, the weighted average interest rate and maturity period of the commercial paper outstanding were 0.17 percent and five days, respectively.