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Short-term Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Short-term Debt (Textual) [Abstract]
Commercial paper borrowings outstanding	$ 508.0us-gaap_CommercialPaper	$ 325.0us-gaap_CommercialPaper
Weighted average interest rate of commercial paper outstanding	0.25%	0.17%

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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