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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurements, Measured on Recurring Basis | The information presented below categorizes the assets and liabilities in the balance sheets that are accounted for at fair value on a recurring basis in periods subsequent to initial recognition. The mutual funds included in Level 1 are valued based on exchange-quoted market prices of individual securities. The mutual funds included in Level 2 are valued based on the closing net asset value per unit. Derivative instruments included in Level 1 are valued using quoted market prices on the New York Mercantile Exchange (NYMEX) or the Intercontinental Exchange (ICE). Derivative instruments classified in Level 2 include physical commodity derivatives that are valued using Over-the-Counter Bulletin Board (OTCBB), broker, or dealer quotation services whose prices are derived principally from, or are corroborated by, observable market inputs. Also included in Level 2 are certain derivative instruments that have values that are similar to, and correlate with, quoted prices for exchange-traded instruments in active markets and derivative instruments with settlement dates more than one year into the future. Derivative instruments included in Level 3 are valued using generally unobservable inputs that are based upon the best information available and reflect management’s assumptions about how market participants would price the asset or liability. The Level 3 balances as of December 31, 2016, September 30, 2016 and December 31, 2015 consisted of gas commodity contracts. The Company’s and the Utilities’ policy is to recognize transfers between the levels of the fair value hierarchy, if any, as of the beginning of the interim reporting period in which circumstances change or events occur to cause the transfer. The mutual funds are included in “Other Investments” on the Company’s balance sheets and in “Other Property and Investments” on Laclede Gas’ balance sheets. Derivative assets and liabilities, including receivables and payables associated with cash margin requirements, are presented net in the balance sheets when a legally enforceable netting agreement exists between the Company, Laclede Gas, or Alagasco and the counterparty to a derivative contract. Spire
| Quoted Prices in Active Markets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Effects of Netting and Cash Margin Receivables /Payables |  | Total
As of December 31, 2016 |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |
US stock/bond mutual funds | $ | 17.2 |  |  | $ | 4.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 21.2 |
NYMEX/ICE natural gas contracts | 8.8 |  |  | — |  |  | — |  |  | (6.6 | ) |  | 2.2 |
Gasoline and heating oil contracts | 0.7 |  |  | — |  |  | — |  |  | — |  |  | 0.7 |
Subtotal | 26.7 |  |  | 4.0 |  |  | — |  |  | (6.6 | ) |  | 24.1 |
Gas Marketing |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | 0.7 |  |  | 4.5 |  |  | — |  |  | (4.9 | ) |  | 0.3 |
Natural gas commodity contracts | — |  |  | 9.8 |  |  | — |  |  | (0.3 | ) |  | 9.5 |
Other |  |  |  |  |  |  |  |  |
Interest rate swaps | — |  |  | 8.2 |  |  | — |  |  | — |  |  | 8.2 |
Total | $ | 27.4 |  |  | $ | 26.5 |  |  | $ | — |  |  | $ | (11.8 | ) |  | $ | 42.1 |
LIABILITIES |  |  |  |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | $ | 0.2 |  |  | $ | — |  |  | $ | — |  |  | $ | (0.2 | ) |  | $ | — |
Subtotal | 0.2 |  |  | — |  |  | — |  |  | (0.2 | ) |  | — |
Gas Marketing |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | 5.1 |  |  | 4.8 |  |  | — |  |  | (9.9 | ) |  | — |
Natural gas commodity contracts | — |  |  | 3.8 |  |  | — |  |  | (0.3 | ) |  | 3.5 |
Total | $ | 5.3 |  |  | $ | 8.6 |  |  | $ | — |  |  | $ | (10.4 | ) |  | $ | 3.5 |
As of September 30, 2016 |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |
US stock/bond mutual funds | $ | 16.8 |  |  | $ | 4.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 20.9 |
NYMEX/ICE natural gas contracts | 5.3 |  |  | — |  |  | — |  |  | (0.4 | ) |  | 4.9 |
Gasoline and heating oil contracts | 0.4 |  |  | — |  |  | — |  |  | (0.3 | ) |  | 0.1 |
Subtotal | 22.5 |  |  | 4.1 |  |  | — |  |  | (0.7 | ) |  | 25.9 |
Gas Marketing |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | 0.4 |  |  | 3.4 |  |  | — |  |  | (3.4 | ) |  | 0.4 |
Natural gas commodity contracts | — |  |  | 8.7 |  |  | 0.2 |  |  | (0.9 | ) |  | 8.0 |
Total | $ | 22.9 |  |  | $ | 16.2 |  |  | $ | 0.2 |  |  | $ | (5.0 | ) |  | $ | 34.3 |
LIABILITIES |  |  |  |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | $ | 1.6 |  |  | $ | — |  |  | $ | — |  |  | $ | (1.6 | ) |  | $ | — |
OTCBB natural gas contracts | — |  |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Subtotal | 1.6 |  |  | 0.2 |  |  | — |  |  | (1.6 | ) |  | 0.2 |
Gas Marketing |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | 3.5 |  |  | 1.6 |  |  | — |  |  | (5.1 | ) |  | — |
Natural gas commodity contracts | — |  |  | 2.6 |  |  | — |  |  | (0.9 | ) |  | 1.7 |
Other |  |  |  |  |  |  |  |  |
Interest rate swaps | — |  |  | 3.0 |  |  | — |  |  | — |  |  | 3.0 |
Total | $ | 5.1 |  |  | $ | 7.4 |  |  | $ | — |  |  | $ | (7.6 | ) |  | $ | 4.9 |
| Quoted Prices in Active Markets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Effects of Netting and Cash Margin Receivables /Payables |  | Total
As of December 31, 2015 |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |
US stock/bond mutual funds | $ | 15.9 |  |  | $ | 4.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 19.9 |
NYMEX/ICE natural gas contracts | 0.1 |  |  | — |  |  | — |  |  | (0.1 | ) |  | — |
Subtotal | 16.0 |  |  | 4.0 |  |  | — |  |  | (0.1 | ) |  | 19.9 |
Gas Marketing |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | 4.1 |  |  | 5.8 |  |  | — |  |  | (6.9 | ) |  | 3.0 |
Natural gas commodity contracts | — |  |  | 1.9 |  |  | 0.2 |  |  | (0.3 | ) |  | 1.8 |
Total | $ | 20.1 |  |  | $ | 11.7 |  |  | $ | 0.2 |  |  | $ | (7.3 | ) |  | $ | 24.7 |
LIABILITIES |  |  |  |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | $ | 17.3 |  |  | $ | — |  |  | $ | — |  |  | $ | (17.3 | ) |  | $ | — |
OTCBB natural gas contracts | — |  |  | 4.6 |  |  | — |  |  | — |  |  | 4.6 |
NYMEX gasoline and heating oil contracts | 0.1 |  |  | — |  |  | — |  |  | (0.1 | ) |  | — |
Subtotal | 17.4 |  |  | 4.6 |  |  | — |  |  | (17.4 | ) |  | 4.6 |
Gas Marketing |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | 1.5 |  |  | 3.5 |  |  | — |  |  | (5.0 | ) |  | — |
Natural gas commodity contracts | — |  |  | 1.4 |  |  | — |  |  | (0.3 | ) |  | 1.1 |
Total | $ | 18.9 |  |  | $ | 9.5 |  |  | $ | — |  |  | $ | (22.7 | ) |  | $ | 5.7 |
Laclede Gas |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurements, Measured on Recurring Basis |
| Quoted Prices in Active Markets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Effects of Netting and Cash Margin Receivables /Payables |  | Total
As of December 31, 2016 |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
US stock/bond mutual funds | $ | 17.2 |  |  | $ | 4.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 21.2 |
NYMEX/ICE natural gas contracts | 8.8 |  |  | — |  |  | — |  |  | (6.6 | ) |  | 2.2 |
Gasoline and heating oil contracts | 0.5 |  |  | — |  |  | — |  |  | — |  |  | 0.5 |
Total | $ | 26.5 |  |  | $ | 4.0 |  |  | $ | — |  |  | $ | (6.6 | ) |  | $ | 23.9 |
LIABILITIES |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | $ | 0.2 |  |  | $ | — |  |  | $ | — |  |  | $ | (0.2 | ) |  | $ | — |
Total | $ | 0.2 |  |  | $ | — |  |  | $ | — |  |  | $ | (0.2 | ) |  | $ | — |
As of September 30, 2016 |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
US stock/bond mutual funds | $ | 16.8 |  |  | $ | 4.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 20.9 |
NYMEX/ICE natural gas contracts | 5.3 |  |  | — |  |  | — |  |  | (0.4 | ) |  | 4.9 |
Gasoline and heating oil contracts | 0.3 |  |  | — |  |  | — |  |  | (0.3 | ) |  | — |
Total | $ | 22.4 |  |  | $ | 4.1 |  |  | $ | — |  |  | $ | (0.7 | ) |  | $ | 25.8 |
LIABILITIES |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | $ | 1.6 |  |  | $ | — |  |  | $ | — |  |  | $ | (1.6 | ) |  | $ | — |
OTCBB natural gas contracts | — |  |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Total | $ | 1.6 |  |  | $ | 0.2 |  |  | $ | — |  |  | $ | (1.6 | ) |  | $ | 0.2 |
| Quoted Prices in Active Markets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Effects of Netting and Cash Margin Receivables /Payables |  | Total
As of December 31, 2015 |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
US stock/bond mutual funds | $ | 15.9 |  |  | $ | 4.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 19.9 |
NYMEX/ICE natural gas contracts | 0.1 |  |  | — |  |  | — |  |  | (0.1 | ) |  | — |
Total | $ | 16.0 |  |  | $ | 4.0 |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | 19.9 |
LIABILITIES |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | $ | 17.3 |  |  | $ | — |  |  | $ | — |  |  | $ | (17.3 | ) |  | $ | — |
OTCBB natural gas contracts | — |  |  | 4.6 |  |  | — |  |  | — |  |  | 4.6 |
NYMEX gasoline and heating oil contracts | 0.1 |  |  | — |  |  | — |  |  | (0.1 | ) |  | — |
Total | $ | 17.4 |  |  | $ | 4.6 |  |  | $ | — |  |  | $ | (17.4 | ) |  | $ | 4.6 |

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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=66048111&loc=d3e19190-110258 + Details
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