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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts (Details) € in Millions, kWh in Millions, gal in Millions, MMBTU in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2016 EUR (€) kWh MMBTU gal	Sep. 30, 2015 EUR (€) kWh MMBTU gal	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Commodity Contracts | Propane
Derivative
Notional amount (in gallons) | gal	396.9	516.3
Commodity Contracts | Electricity | Long
Derivative
Notional amount (energy measure)	761.2	474.3
Commodity Contracts | Electricity | Short
Derivative
Notional amount (energy measure)	264.6	297.9
Natural Gas Futures, Forward and Pipeline Contracts | Natural Gas
Derivative
Notional amount (energy measure) | MMBTU	71.1	110.2
Natural Gas Basis Swap Contracts | Natural Gas
Derivative
Notional amount (energy measure) | MMBTU	118.3	75.7
Natural Gas Storage and Propane Storage NYMEX Contracts | Propane
Derivative
Notional amount (in gallons) | gal	0.0	2.0
Natural Gas Storage and Propane Storage NYMEX Contracts | Natural Gas
Derivative
Notional amount (energy measure) | MMBTU	1.9	1.9
FTRs & NYISO Capacity Contracts | Electricity
Derivative
Notional amount (energy measure)	0.0	82.0
Interest Rate Swap
Derivative
Notional amount | €	€ 645.8	€ 645.8
Interest Rate Protection Agreements
Derivative
Notional amount | $			$ 0.0	$ 250.0
Foreign Currency Contracts
Derivative
Notional amount | $			314.3	227.9
Cross Currency Contracts
Derivative
Notional amount | $			$ 59.1	$ 59.1
Regulated Utility Operations | Commodity Contracts | Natural Gas
Derivative
Notional amount (energy measure) | MMBTU	18.4	18.9
Regulated Utility Operations | Commodity Contracts | Electricity
Derivative
Notional amount (energy measure)	0.0	136.0
Regulated Utility Operations | FTRs & NYISO Capacity Contracts | Electricity
Derivative
Notional amount (energy measure)	58.3	277.1

X

- Definition

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

+ References

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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- Definition

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

+ References

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

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