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
-Sentence Column B

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

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High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Low end period remaining until maturity of derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of gain (loss) from the ineffectiveness of the hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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- Definition

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

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No definition available.

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Nominal volume used to calculate payments on a derivative instrument.

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- Definition

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.

+ References

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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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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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
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Derivative Instruments and Hedging Activities (Details) kWh in Millions, gal in Millions, MMBTU in Millions	3 Months Ended
	Dec. 31, 2015 USD ($) kWh MMBTU gal	Dec. 31, 2014 EUR (€) kWh MMBTU gal	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Derivative
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months				$ 2,200,000
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months				16,000,000
Restricted cash				55,500,000	$ 69,300,000	$ 54,600,000
Gain (loss) on ineffectiveness and excluded derivatives recognized in income	$ 3,400,000
Commodity Contracts
Derivative
Amounts remaining in AOCI related to commodity derivative hedges				0
Interest Rate Swap
Derivative
Notional amount (in currency) \| €		€ 401,100,000	€ 645,800,000
Interest Rate Protection Agreements
Derivative
Notional amount (in currency)				290,000,000		0
Lower remaining maturity range (in years)	10 years
Higher remaining maturity range (in years)	30 years
Foreign Currency Contracts
Derivative
Maximum length of time hedged in price risk cash flow hedges (in months)	39 months
Notional amount (in currency)		€ 0	€ 0	280,500,000		225,800,000
Cross Currency Contracts
Derivative
Notional amount (in currency)				$ 59,100,000		$ 52,000,000
Propane \| Commodity Contracts
Derivative
Volume of LPG commodity derivatives (in gallons) \| gal	481.9	429.6
Maximum length of time hedging exposure to LPG commodity price risk (in months)	45 months
Propane \| Natural Gas Storage and Propane Storage NYMEX Contracts
Derivative
Volume of LPG commodity derivatives (in gallons) \| gal	1.8	2.6
Natural Gas \| Gas Basis Swap Contracts
Derivative
Notional amount (energy measure) \| MMBTU	86.1	37.1
Natural Gas \| Natural Gas Futures, Forward And Pipeline Contracts
Derivative
Notional amount (energy measure) \| MMBTU	104.9	127.8
Maximum length of time hedged in price risk cash flow hedges (in months)	39 months
Natural Gas \| Natural Gas Storage and Propane Storage NYMEX Contracts
Derivative
Notional amount (energy measure) \| MMBTU	1.6	0.6
Natural Gas \| Gas Utility \| Commodity Contracts
Derivative
Notional amount (energy measure) \| MMBTU	12.4	11.2
Maximum length of time hedged in price risk cash flow hedges (in months)	9 months
Electricity \| Commodity Contracts \| Long
Derivative
Notional amount (energy measure) \| kWh	547.8	350.0
Maximum length of time hedged in price risk cash flow hedges (in months)	39 months
Electricity \| Commodity Contracts \| Short
Derivative
Notional amount (energy measure) \| kWh	252.9	184.1
Maximum length of time hedged in price risk cash flow hedges (in months)	37 months
Electricity \| Electric Utility \| Commodity Contracts
Derivative
Notional amount (energy measure) \| kWh	333.3	486.2
Maximum length of time hedged in price risk cash flow hedges (in months)	11 months
Electricity \| Electric Utility \| Financial Transmission Rights
Derivative
Notional amount (energy measure) \| kWh	223.7
Maximum length of time hedged in price risk cash flow hedges (in months)	5 months
Electricity \| Electric Utility \| NYISO Capacity Swap Contracts
Derivative
Notional amount (energy measure) \| kWh		331.8
Maximum length of time hedged in price risk cash flow hedges (in months)	5 months