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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts Related to Open Derivative Contracts | The following table summarizes by derivative type the gross notional amounts related to open derivative contracts at September 30, 2018 and 2017 and the final settlement date of the Company's open derivative transactions as of September 30, 2018, excluding those derivatives that qualified for the NPNS exception:
|  |  |  |  |  | Notional Amounts (in millions)
Type |  | Units |  | Settlements Extending Through |  | 2018 |  | 2017
Commodity Price Risk: |  |  |  |  |  |  |  |
Regulated Utility Operations |  |  |  |  |  |  |  |
Gas Utility NYMEX natural gas futures and option contracts |  | Dekatherms |  | September 2019 |  | 23.2 |  |  | 14.8 |
FTRs contracts |  | Kilowatt hours |  | N/A |  | — |  |  | 101.2 |
Non-utility Operations |  |  |  |  |  |  |  |
LPG swaps |  | Gallons |  | September 2020 |  | 394.3 |  |  | 325.5 |
Natural gas futures, forward and pipeline contracts |  | Dekatherms |  | October 2022 |  | 159.7 |  |  | 75.9 |
Natural gas basis swap contracts |  | Dekatherms |  | March 2023 |  | 54.4 |  |  | 104.2 |
NYMEX natural gas storage |  | Dekatherms |  | May 2019 |  | 1.8 |  |  | 1.9 |
NYMEX propane storage |  | Gallons |  | April 2019 |  | 0.6 |  |  | 0.3 |
Electricity long forward and futures contracts |  | Kilowatt hours |  | May 2022 |  | 4,307.6 |  |  | 4,440.3 |
Electricity short forward and futures contracts |  | Kilowatt hours |  | March 2022 |  | 359.3 |  |  | 447.0 |
Interest Rate Risk: |  |  |  |  |  |  |  |
Interest rate swaps |  | Euro |  | October 2020 |  | € | 585.8 |  |  | € | 645.8 |
Interest rate swaps |  | USD |  | July 2022 |  | $ | 114.1 |  |  | $ | — |
Foreign Currency Exchange Rate Risk: |  |  |  |  |  |  |  |
Forward foreign currency exchange contracts |  | USD |  | September 2021 |  | $ | 512.2 |  |  | $ | 424.8 |
Cross-currency swaps |  | USD |  | April 2020 |  | $ | 49.9 |  |  | $ | 59.1 |
Schedule of Derivative Assets, Liabilities and the Effects of Offsetting | The following table presents the Company’s derivative assets and liabilities by type, as well as the effects of offsetting, as of September 30, 2018 and 2017:
| 2018 |  | 2017
Derivative assets: |  |  |
Derivatives designated as hedging instruments: |  |  |
Foreign currency contracts | $ | 1.5 |  |  | $ | 3.2 |
Cross-currency contracts | 0.9 |  |  | — |
| 2.4 |  |  | 3.2 |
Derivatives subject to PGC and DS mechanisms: |  |  |
Commodity contracts | 3.0 |  |  | 1.7 |
Derivatives not designated as hedging instruments: |  |  |
Commodity contracts | 208.0 |  |  | 102.4 |
Foreign currency contracts | 19.1 |  |  | 9.0 |
| 227.1 |  |  | 111.4 |
Total derivative assets – gross | 232.5 |  |  | 116.3 |
Gross amounts offset in the balance sheet | (34.3 | ) |  | (35.7 | )
Cash collateral received | (12.2 | ) |  | (8.3 | )
Total derivative assets – net | $ | 186.0 |  |  | $ | 72.3 |
Derivative liabilities: |  |  |
Derivatives designated as hedging instruments: |  |  |
Foreign currency contracts | $ | (0.4 | ) |  | $ | (5.5 | )
Cross-currency contracts | — |  |  | (2.9 | )
Interest rate contracts | (1.0 | ) |  | (2.3 | )
| (1.4 | ) |  | (10.7 | )
Derivatives subject to PGC and DS mechanisms: |  |  |
Commodity contracts | (0.1 | ) |  | (1.5 | )
Derivatives not designated as hedging instruments: |  |  |
Commodity contracts | (43.3 | ) |  | (37.6 | )
Foreign currency contracts | (14.0 | ) |  | (32.7 | )
| (57.3 | ) |  | (70.3 | )
Total derivative liabilities – gross | (58.8 | ) |  | (82.5 | )
Gross amounts offset in the balance sheet | 34.3 |  |  | 35.7 |
Total derivative liabilities – net | $ | (24.5 | ) |  | $ | (46.8 | )
Effects of Derivative Instruments on Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest | The following tables provide information on the effects of derivative instruments on the Consolidated Statements of Income and changes in AOCI for Fiscal 2018, Fiscal 2017 and Fiscal 2016:
| Gain (Loss) Recognized in AOCI |  | Gain (Loss) Reclassified from AOCI and Noncontrolling Interests into Income |  | Location of Gain (Loss) Reclassified from AOCI and Noncontrolling Interests into Income
| 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | $ | 0.4 |  |  | $ | 0.2 |  |  | $ | 3.6 |  |  | $ | (3.0 | ) |  | $ | 17.8 |  |  | $ | 17.2 |  |  | Cost of sales
Cross-currency contracts | 1.2 |  |  | 0.5 |  |  | 0.1 |  |  | 1.1 |  |  | (0.1 | ) |  | 0.4 |  |  | Interest expense /other operating income, net
Interest rate contracts | 0.2 |  |  | 1.5 |  |  | (32.5 | ) |  | (5.0 | ) |  | (3.9 | ) |  | (4.5 | ) |  | Interest expense
Total | $ | 1.8 |  |  | $ | 2.2 |  |  | $ | (28.8 | ) |  | $ | (6.9 | ) |  | $ | 13.8 |  |  | $ | 13.1 |  |  |
| Gain (Loss) Recognized in Income | Location of Gain (Loss) Recognized in Income
| 2018 |  | 2017 |  | 2016
Derivatives Not Designated as Hedging Instruments: |  |  |  |  |  |
Commodity contracts | $ | 155.4 |  |  | $ | 166.0 |  |  | $ | (65.0 | ) | Cost of sales
Commodity contracts | (5.3 | ) |  | (2.0 | ) |  | (2.2 | ) | Revenues
Commodity contracts | 0.3 |  |  | 0.2 |  |  | (0.1 | ) | Operating and administrative expenses / other operating income, net
Foreign currency contracts | 16.2 |  |  | (23.8 | ) |  | — |  | Gain (loss) on foreign currency contracts, net
Total | $ | 166.6 |  |  | $ | 140.4 |  |  | $ | (67.3 | ) |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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