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Short-term Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Short-term Debt (Textual) [Abstract]
Commercial paper outstanding	$ 253.0	$ 157.0
Weighted average interest rate of commercial paper outstanding	0.27%	0.27%
Weighted average maturity period of commercial paper outstanding	9 days	6 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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