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Short-term Debt
3 Months Ended
Dec. 31, 2014
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 $508.0 million at December 31, 2014 and $325.0 million at September 30, 2014. The weighted average interest rate of the commercial paper outstanding was 0.25 percent and 0.17 percent at December 31, 2014 and September 30, 2014, respectively.