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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011
Regulatory Assets [Line Items]
Fair value of electric utility electricity supply contracts	$ 187.0		$ 33.5
Maximum Percentage of Incremental Operating Margin Traditional Ratemaking (as a percent)	5.00%
Number of years to be eligible for a distribution system improvement charge a utility must have filed a general rate filing (in years)	5
Number of regulated utilities on which there is potential effect of legislation (in regulated utilities)	4
Deferral Fuel and Power [Member]
Regulatory Assets [Line Items]
Unrealized gains (losses) on derivative financial instrument contracts	0.3	(3.1)	(1.1)
Electric Utility Electric Supply Contracts [Member]
Regulatory Assets [Line Items]
Fair value of electric utility electricity supply contracts	$ 13.1	$ 8.7	$ 10.1

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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