Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

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Maximum length of time hedged in price risk cash flow hedges.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal energy measure used to calculate payments on a derivative instrument.

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Nominal volume used to calculate payments on a derivative instrument.

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

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-Name Regulation S-X (SX)

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-Section 02

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Derivative Instruments and Hedging Activities (Details) kWh in Millions, gal in Millions, MMBTU in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($) kWh MMBTU gal	Jun. 30, 2014 EUR (€) kWh MMBTU gal	Jun. 30, 2015 EUR (€)	Jun. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Derivative
Volume of LPG commodity derivatives (in gallons) \| gal		405.9	274.3
Maximum length of time hedging exposure to LPG commodity price risk		42 months
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months					$ 2,600,000
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months					16,100,000
Restricted cash					45,200,000	$ 16,600,000	$ 5,900,000
Brokerage Accounts
Derivative
Restricted cash					45,200,000		5,900,000
Interest Rate Swaps
Derivative
Notional amount \| €			€ 401,100,000	€ 659,100,000
Interest Rate Protection Agreements
Derivative
Notional amount					0		0
Foreign Currency
Derivative
Maximum length of time hedged in price risk cash flow hedges		33 months
Notional amount					$ 227,900,000		$ 219,800,000
Cross Currency Contracts
Derivative
Notional amount								$ 52,000,000
Gas Utility
Derivative
Notional amount (energy measure) \| MMBTU		13.1	10.9
Maximum length of time hedged in price risk cash flow hedges		15 months
Electric Utility
Derivative
Notional amount (energy measure) \| kWh		494.5	315.8
Maximum length of time hedged in price risk cash flow hedges		11 months
Midstream & Marketing \| Electricity (millions of kilowatt-hours) \| Forward Purchase Contracts
Derivative
Notional amount (energy measure) \| kWh		429.5	492.5
Maximum length of time hedged in price risk cash flow hedges		30 months
Midstream & Marketing \| Electricity (millions of kilowatt-hours) \| Forward Sales Contracts
Derivative
Notional amount (energy measure) \| kWh		210.5	193.2
Maximum length of time hedged in price risk cash flow hedges		15 months
Midstream & Marketing \| Propane Storage (millions of dekatherms) \| Forward Sales Contracts
Derivative
Volume of LPG commodity derivatives (in gallons) \| gal		2.0	2.9
Midstream & Marketing \| Gas Utility Natural Gas \| Forward Purchase Contracts
Derivative
Notional amount (energy measure) \| MMBTU		57.2	67.7
Maximum length of time hedged in price risk cash flow hedges		45 months
Midstream & Marketing \| Natural Gas Storage \| Forward Sales Contracts
Derivative
Notional amount (energy measure) \| MMBTU		0.8	0.5
Midstream & Marketing \| FTR and NYISO Contracts \| Electric transmission congestion (excluding Electric Utility)
Derivative
Notional amount (energy measure) \| kWh		494.5	747.4
Maximum length of time hedged in price risk cash flow hedges		11 months
Net Investment Hedging
Derivative
Notional amount \| €			€ 0	€ 0
Interest Expense \| Interest Rate Swaps
Derivative
Loss on interest rate swaps	$ 9,000,000	$ 9,000,000