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FAIR VALUE OF FINANCIAL INSTRUMENTS | 3 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
FAIR VALUE OF FINANCIAL INSTRUMENTS | FAIR VALUE OF FINANCIAL INSTRUMENTS The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis are shown in the following tables, classified according to the fair value hierarchy. There were no such instruments classified as Level 3 (significant unobservable inputs) as of December 31, 2017, September 30, 2017, or December 31, 2016. The carrying amounts of cash and cash equivalents and short-term debt approximate fair value due to the short maturity of these instruments. The fair values of long-term debt are estimated based on market prices for similar issues. Refer to Note 6, Fair Value Measurements, for information on financial instruments measured at fair value on a recurring basis.
|  |  |  |  | Classification of Estimated Fair Value
| Carrying Amount |  | Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Observable Inputs (Level 2)
Spire
As of December 31, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 6.7 |  |  | $ | 6.7 |  |  | $ | 6.7 |  |  | $ | — |
Short-term debt | 583.6 |  |  | 583.6 |  |  | — |  |  | 583.6 |
Long-term debt, including current portion | 2,135.5 |  |  | 2,280.1 |  |  | — |  |  | 2,280.1 |
As of September 30, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 7.4 |  |  | $ | 7.4 |  |  | $ | 7.4 |  |  | $ | — |
Short-term debt | 477.3 |  |  | 477.3 |  |  | — |  |  | 477.3 |
Long-term debt, including current portion | 2,095.0 |  |  | 2,210.3 |  |  | — |  |  | 2,210.3 |
As of December 31, 2016 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 10.6 |  |  | $ | 10.6 |  |  | $ | 10.6 |  |  | $ | — |
Short-term debt | 506.4 |  |  | 506.4 |  |  | — |  |  | 506.4 |
Long-term debt, including current portion | 2,071.3 |  |  | 2,258.1 |  |  | — |  |  | 2,258.1 |
Spire Missouri
As of December 31, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 4.1 |  |  | $ | 4.1 |  |  | $ | 4.1 |  |  | $ | — |
Short-term debt | 275.6 |  |  | 275.6 |  |  | — |  |  | 275.6 |
Long-term debt, including current portion | 974.1 |  |  | 1,068.6 |  |  | — |  |  | 1,068.6 |
As of September 30, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 2.5 |  |  | $ | 2.5 |  |  | $ | 2.5 |  |  | $ | — |
Short-term debt | 203.0 |  |  | 203.0 |  |  | — |  |  | 203.0 |
Long-term debt, including current portion | 973.9 |  |  | 1,056.9 |  |  | — |  |  | 1,056.9 |
As of December 31, 2016 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 4.0 |  |  | $ | 4.0 |  |  | $ | 4.0 |  |  | $ | — |
Short-term debt | 312.9 |  |  | 312.9 |  |  | — |  |  | 312.9 |
Long-term debt | 804.3 |  |  | 910.7 |  |  | — |  |  | 910.7 |
Spire Alabama
As of December 31, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Short-term debt | 163.1 |  |  | 163.1 |  |  | — |  |  | 163.1 |
Long-term debt | 277.8 |  |  | 303.5 |  |  | — |  |  | 303.5 |
As of September 30, 2017 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |
Short-term debt | 169.9 |  |  | 169.9 |  |  | — |  |  | 169.9 |
Long-term debt | 247.8 |  |  | 269.4 |  |  | — |  |  | 269.4 |
As of December 31, 2016 |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Short-term debt | 102.5 |  |  | 102.5 |  |  | — |  |  | 102.5 |
Long-term debt | 247.7 |  |  | 269.3 |  |  | — |  |  | 269.3 |

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- References No definition available. + Details
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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + 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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