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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
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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)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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