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Short-term Debt
3 Months Ended
Dec. 31, 2018
Short-term Debt [Abstract]  
Short-term Debt Short-term DebtOur short-term debt obligations primarily consist of commercial paper borrowings. Commercial paper borrowings outstanding were $630.0 million and $550.0 million at December 31, 2018 and September 30, 2018, respectively. The weighted average interest rate of the commercial paper outstanding was 2.61 percent and 2.27 percent at December 31, 2018 and September 30, 2018, respectively.