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Short-term Debt	3 Months Ended
Short-term Debt	Dec. 31, 2015
Debt Disclosure [Abstract]
Short-term Debt	Short-term Debt Our short-term debt obligations are primarily comprised of commercial paper borrowings. Commercial paper borrowings outstanding were $161.0 million at December 31, 2015. The weighted average interest rate of the commercial paper outstanding was 0.49 percent at December 31, 2015. There were no commercial paper borrowings outstanding at September 30, 2015.