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Derivative Instruments and Hedging Activities - Schedule of Derivative Assets, Liabilities and the Effects of Offsetting (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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Derivatives, Fair Value |  |  |
Derivative financial assets | $ 45.4 | $ 26.3 | [1]
Derivative asset offset amount, net | (18.4) | (2.1) | [1]
Total derivative assets - net | 27.0 | 24.2 | [1]
Derivative financial liabilities | 75.2 | 57.5 | [1]
Derivative liability offset amount, net | 18.4 | 2.1 | [1]
Total derivative liabilities - net | (56.8) | (55.4) | [1]
Designated as Hedging Instruments |  |  |
Derivatives, Fair Value |  |  |
Derivative financial assets | 17.8 | 18.9 | [1]
Derivative financial liabilities | (26.4) | (43.9) | [1]
Designated as Hedging Instruments | Commodity Contracts |  |  |
Derivatives, Fair Value |  |  |
Derivative financial assets | 2.8 | 18.0 | [1]
Derivative financial liabilities | (5.3) | (4.5) | [1]
Designated as Hedging Instruments | Foreign Currency Contracts |  |  |
Derivatives, Fair Value |  |  |
Derivative financial assets | 12.8 | 0.9 | [1]
Derivative financial liabilities | (0.1) | (7.2) | [1]
Designated as Hedging Instruments | Cross Currency Contracts |  |  |
Derivatives, Fair Value |  |  |
Derivative financial assets | 2.1 | 0 | [1]
Derivative financial liabilities | 0 | (1.2) | [1]
Designated as Hedging Instruments | Interest Rate Contracts |  |  |
Derivatives, Fair Value |  |  |
Derivative financial assets | 0.1 | 0 | [1]
Derivative financial liabilities | (21.0) | (31.0) | [1]
Not Designated as Hedging Instruments | Commodity Contracts |  |  |
Derivatives, Fair Value |  |  |
Derivative financial assets | 25.9 | 7.4 | [1]
Derivative financial liabilities | 46.6 | 6.9 | [1]
Accounted for Under ASC 980 | Commodity Contracts |  |  |
Derivatives, Fair Value |  |  |
Derivative financial assets | 1.7 | 0 | [1]
Derivative financial liabilities | $ (2.2) | $ (6.7) | [1]
[1] | Certain immaterial amounts have been revised to correct the classification of derivatives.

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- Definition Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value, after offset of derivative liability, 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: 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=34720828&loc=SL20225862-175312 Reference 2: 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=36459792&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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