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Fair Value Measurement (Tables) | 6 Months Ended
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Mar. 31, 2017
Fair Value Disclosures [Abstract] |
Financial Assets and Financial Liabilities that are Measured at Fair Value on a Recurring Basis | The following table presents on a gross basis our financial assets and liabilities, including both current and noncurrent portions, that are measured at fair value on a recurring basis within the fair value hierarchy, as of March 31, 2017, September 30, 2016 and March 31, 2016:
|  | Asset (Liability)
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
March 31, 2017: |  |  |  |  |  |  |  |
Derivative instruments: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 56.0 |  |  | $ | 18.0 |  |  | $ | — |  |  | $ | 74.0 |
Foreign currency contracts |  | $ | — |  |  | $ | 15.6 |  |  | $ | — |  |  | $ | 15.6 |
Cross-currency contracts |  | $ | — |  |  | $ | 3.0 |  |  | $ | — |  |  | $ | 3.0 |
Liabilities: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (28.0 | ) |  | $ | (11.0 | ) |  | $ | — |  |  | $ | (39.0 | )
Foreign currency contracts |  | $ | — |  |  | $ | (1.5 | ) |  | $ | — |  |  | $ | (1.5 | )
Interest rate contracts |  | $ | — |  |  | $ | (2.2 | ) |  | $ | — |  |  | $ | (2.2 | )
Non-qualified supplemental postretirement grantor trust investments (a) |  | $ | 35.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 35.2 |
September 30, 2016: |  |  |  |  |  |  |  |
Derivative instruments: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 28.9 |  |  | $ | 26.0 |  |  | $ | — |  |  | $ | 54.9 |
Foreign currency contracts |  | $ | — |  |  | $ | 17.8 |  |  | $ | — |  |  | $ | 17.8 |
Liabilities: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (76.8 | ) |  | $ | (21.8 | ) |  | $ | — |  |  | $ | (98.6 | )
Foreign currency contracts |  | $ | — |  |  | $ | (2.4 | ) |  | $ | — |  |  | $ | (2.4 | )
Interest rate contracts |  | $ | — |  |  | $ | (3.9 | ) |  | $ | — |  |  | $ | (3.9 | )
Cross-currency contracts |  | $ | — |  |  | $ | (0.5 | ) |  | $ | — |  |  | $ | (0.5 | )
Non-qualified supplemental postretirement grantor trust investments (a) |  | $ | 33.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 33.0 |
March 31, 2016: |  |  |  |  |  |  |  |
Derivative instruments: |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 20.3 |  |  | $ | 16.7 |  |  | $ | — |  |  | $ | 37.0 |
Foreign currency contracts |  | $ | — |  |  | $ | 11.6 |  |  | $ | — |  |  | $ | 11.6 |
Liabilities: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (59.0 | ) |  | $ | (48.4 | ) |  | $ | — |  |  | $ | (107.4 | )
Foreign currency contracts |  | $ | — |  |  | $ | (5.0 | ) |  | $ | — |  |  | $ | (5.0 | )
Interest rate contracts |  | $ | — |  |  | $ | (3.4 | ) |  | $ | — |  |  | $ | (3.4 | )
Cross-currency contracts |  | $ | — |  |  | $ | (1.3 | ) |  | $ | — |  |  | $ | (1.3 | )
Non-qualified supplemental postretirement grantor trust investments (a) |  | $ | 31.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 31.8 |
(a) | Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans.
Schedule of Carrying Amount and Estimated Fair Value of Long-term Debt | The carrying amount and estimated fair value of our long-term debt (including current maturities but excluding unamortized debt issuance costs) at March 31, 2017, September 30, 2016 and March 31, 2016 were as follows:
| March 31, 2017 |  | September 30, 2016 |  | March 31, 2016
Carrying amount | $ | 4,238.9 |  |  | $ | 3,832.3 |  |  | $ | 3,639.0 |
Estimated fair value | $ | 4,255.0 |  |  | $ | 4,052.3 |  |  | $ | 3,775.3 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: 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=49121117&loc=d3e13433-108611 + Details
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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=36462937&loc=d3e19190-110258 + Details
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