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Short-term Debt	6 Months Ended
Short-term Debt	Mar. 31, 2016
Debt Disclosure [Abstract]
Short-term Debt	Short-term Debt Our short-term debt obligations primarily consist of commercial paper borrowings. Commercial paper borrowings outstanding were $277.6 million at March 31, 2016. The weighted average interest rate of the commercial paper outstanding was 0.45 percent at March 31, 2016. There were no commercial paper borrowings outstanding at September 30, 2015.