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Short-term Debt (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Short-term Debt (Textual) [Abstract]
Commercial paper outstanding	$ 270.0	$ 0
Weighted average interest rate of commercial paper outstanding	0.28%
Weighted average maturity period of commercial paper outstanding	9 days

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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