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Fair Value Measurement (Tables) | 6 Months Ended
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Mar. 31, 2013
Fair Value Disclosures [Abstract] |
Financial assets and financial liabilities that are measured at fair value on a recurring basis | The following table presents our financial assets and financial liabilities that are measured at fair value on a recurring basis for each of the fair value hierarchy levels, including both current and noncurrent portions, as of March 31, 2013, September 30, 2012 and March 31, 2012:
|  | Asset (Liability)
|  | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Unobservable Inputs (Level 3) |  | Total
March 31, 2013: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Derivative financial instruments: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 7.9 |  |  | $ | 5.7 |  |  | $ | — |  |  | $ | 13.6 |
Foreign currency contracts |  | $ | — |  |  | $ | 1.5 |  |  | $ | — |  |  | $ | 1.5 |
Interest rate contracts |  | $ | — |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 4.2 |
Liabilities: |  |  |  |  |  |  |  |
Derivative financial instruments: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (2.7 | ) |  | $ | (12.6 | ) |  | $ | — |  |  | $ | (15.3 | )
Foreign currency contracts |  | $ | — |  |  | $ | (0.5 | ) |  | $ | — |  |  | $ | (0.5 | )
Interest rate contracts |  | $ | — |  |  | $ | (60.5 | ) |  | $ | — |  |  | $ | (60.5 | )
September 30, 2012: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Derivative financial instruments: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 8.6 |  |  | $ | 4.5 |  |  | $ | — |  |  | $ | 13.1 |
Foreign currency contracts |  | $ | — |  |  | $ | 1.8 |  |  | $ | — |  |  | $ | 1.8 |
Liabilities: |  |  |  |  |  |  |  |
Derivative financial instruments: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (7.8 | ) |  | $ | (53.2 | ) |  | $ | — |  |  | $ | (61.0 | )
Interest rate contracts |  | $ | — |  |  | $ | (71.9 | ) |  | $ | — |  |  | $ | (71.9 | )
March 31, 2012: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Derivative financial instruments: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 9.8 |  |  | $ | 1.2 |  |  | $ | — |  |  | $ | 11.0 |
Foreign currency contracts |  | $ | — |  |  | $ | 3.1 |  |  | $ | — |  |  | $ | 3.1 |
Liabilities: |  |  |  |  |  |  |  |
Derivative financial instruments: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (41.1 | ) |  | $ | (42.2 | ) |  | $ | — |  |  | $ | (83.3 | )
Interest rate contracts |  | $ | — |  |  | $ | (53.2 | ) |  | $ | — |  |  | $ | (53.2 | )

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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