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FAIR VALUE MEASUREMENTS | 12 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | FAIR VALUE MEASUREMENTS Spire 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 NYMEX. Derivative instruments classified as 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. 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. There were no material Level 3 balances as of September 30, 2017 or 2016. 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 “Property and other investments” on Spire Missouri’s balance sheets. Derivative assets and liabilities, including receivables and payables associated with cash margin requirements, are presented net on the balance sheets when a legally enforceable netting agreement exist between the Company or Spire Missouri and the counterparty to the derivative contract. For additional information on derivative instruments, see Note 10, Derivative Instruments and Hedging Activities.
| 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 September 30, 2017 |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
Gas Utility: |  |  |  |  |  |  |  |  |
US stock/bond mutual funds | $ | 18.3 |  |  | $ | 4.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 22.4 |
NYMEX/ICE natural gas contracts | 3.4 |  |  | — |  |  | — |  |  | (3.4 | ) |  | — |
Gasoline and heating oil contracts | 0.1 |  |  | — |  |  | — |  |  | — |  |  | 0.1 |
Gas Marketing: |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | 1.3 |  |  | 1.3 |  |  | — |  |  | (2.1 | ) |  | 0.5 |
Natural gas commodity contracts | — |  |  | 6.8 |  |  | 0.1 |  |  | (1.2 | ) |  | 5.7 |
Total | $ | 23.1 |  |  | $ | 12.2 |  |  | $ | 0.1 |  |  | $ | (6.7 | ) |  | $ | 28.7 |
LIABILITIES |  |  |  |  |  |  |  |  |
Gas Utility: |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | $ | 1.9 |  |  | $ | — |  |  | $ | — |  |  | $ | (1.9 | ) |  | $ | — |
Gas Marketing: |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | 1.8 |  |  | 0.3 |  |  | — |  |  | (2.1 | ) |  | — |
Natural gas commodity contracts | — |  |  | 8.4 |  |  | — |  |  | (1.2 | ) |  | 7.2 |
Other: |  |  |  |  |  |  |  |  |
Interest rate swaps | — |  |  | 0.9 |  |  | — |  |  | — |  |  | 0.9 |
Total | $ | 3.7 |  |  | $ | 9.6 |  |  | $ | — |  |  | $ | (5.2 | ) |  | $ | 8.1 |
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 |
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 |
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 |
Spire Missouri
| 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 September 30, 2017 |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
US stock/bond mutual funds | $ | 18.3 |  |  | $ | 4.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 22.4 |
NYMEX/ICE natural gas contracts | 3.4 |  |  | — |  |  | — |  |  | (3.4 | ) |  | — |
Gasoline and heating oil contracts | 0.1 |  |  | — |  |  | — |  |  | — |  |  | 0.1 |
Total | $ | 21.8 |  |  | $ | 4.1 |  |  | $ | — |  |  | $ | (3.4 | ) |  | $ | 22.5 |
LIABILITIES |  |  |  |  |  |  |  |  |
NYMEX/ICE natural gas contracts | $ | 1.9 |  |  | $ | — |  |  | $ | — |  |  | $ | (1.9 | ) |  | $ | — |
Total | $ | 1.9 |  |  | $ | — |  |  | $ | — |  |  | $ | (1.9 | ) |  | $ | — |
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 |
Spire Alabama During the fiscal second quarter of 2016 Spire Alabama commenced a gasoline derivative program to stabilize the cost of fuel used in operations. As of September 30, 2017, the fair value of related gasoline contracts was not significant.

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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