Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Disclosures About Derivative Instruments and Hedging Activities - Balance Sheet Location and Fair Value of Derivative Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013
Derivatives, Fair Value
Derivative Asset, Offset Amount, Net	$ (1.8)		$ 0
Derivative Asset	13.7	24.2	18.7
Derivative Liability, Offset Amount, Net	1.8		0
Derivative Liability	43.1	55.4	80.7
Designated as Hedging Instrument
Derivatives, Fair Value
Derivative Asset, Fair Value, Net	7.5		14.4
Derivative Liability, Fair Value, Net	(35.1)		(65.2)
Designated as Hedging Instrument \| Cross Currency Interest Rate Contract
Derivatives, Fair Value
Derivative Asset, Fair Value, Net	0		0
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value
Derivative Asset, Fair Value, Net	6.4		4.2
Derivative Liability, Fair Value, Net	(9.8)		(7.9)
Derivative Financial Instruments and Other Assets \| Designated as Hedging Instrument \| Commodity Contracts
Derivatives, Fair Value
Derivative Asset, Fair Value, Net	7.0		5.3
Derivative Financial Instruments and Other Assets \| Designated as Hedging Instrument \| Foreign Currency Contracts
Derivatives, Fair Value
Derivative Asset, Fair Value, Net	0.5		1.0
Derivative Financial Instruments and Other Assets \| Derivatives Not Designated as Hedging Instruments \| Commodity Contracts
Derivatives, Fair Value
Derivative Asset, Fair Value, Net	6.4		4.2
Derivative Financial Instruments, Assets \| Designated as Hedging Instrument \| Interest Rate Contracts
Derivatives, Fair Value
Derivative Asset, Fair Value, Net	0		8.1
Derivative Financial Instruments, Assets \| Derivatives Subject to Utility Rate Regulation \| Commodity Contracts
Derivatives, Fair Value
Derivative Asset, Fair Value, Net	1.6		0.1
Derivative Financial Instruments, Assets \| Derivatives Not Designated as Hedging Instruments \| Foreign Currency Contracts
Derivatives, Fair Value
Derivative Asset, Fair Value, Net	0		0
Derivative Financial Instruments and Other Noncurrent Liabilities \| Designated as Hedging Instrument \| Commodity Contracts
Derivatives, Fair Value
Derivative Liability, Fair Value, Net	(3.1)		(17.9)
Derivative Financial Instruments and Other Noncurrent Liabilities \| Designated as Hedging Instrument \| Foreign Currency Contracts
Derivatives, Fair Value
Derivative Liability, Fair Value, Net	(4.8)		(0.4)
Derivative Financial Instruments and Other Noncurrent Liabilities \| Designated as Hedging Instrument \| Cross Currency Interest Rate Contract
Derivatives, Fair Value
Derivative Liability, Fair Value, Net	(2.0)		0
Derivative Financial Instruments and Other Noncurrent Liabilities \| Designated as Hedging Instrument \| Interest Rate Contracts
Derivatives, Fair Value
Derivative Liability, Fair Value, Net	(25.2)		(46.9)
Derivative Financial Instruments and Other Noncurrent Liabilities \| Derivatives Subject to Utility Rate Regulation \| Commodity Contracts
Derivatives, Fair Value
Derivative Liability, Fair Value, Net	0		(7.6)
Derivative Financial Instruments and Other Noncurrent Liabilities \| Derivatives Not Designated as Hedging Instruments \| Commodity Contracts
Derivatives, Fair Value
Derivative Liability, Fair Value, Net	(9.8)		(6.6)
Derivative Financial Instruments, Liabilities [Member] \| Derivatives Not Designated as Hedging Instruments \| Foreign Currency Contracts
Derivatives, Fair Value
Derivative Liability, Fair Value, Net	$ 0		$ (1.3)