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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Dec. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Estimated Fair Value of Financial Instruments Not Measured at Fair Value on Recurring Basis

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, 2025, September 30, 2025, and December 31, 2024.

 

 

 

 

 

 

 

 

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, 2025

 

 

 

 

 

 

 

 

 

 

 

 

Cash and cash equivalents

 

$

4.1

 

 

$

4.1

 

 

$

4.1

 

 

$

—

 

Notes payable

 

 

412.0

 

 

 

412.0

 

 

 

—

 

 

 

412.0

 

Long-term debt, including current portion

 

 

4,937.5

 

 

 

4,822.3

 

 

 

—

 

 

 

4,822.3

 

As of September 30, 2025

 

 

 

 

 

 

 

 

 

 

 

 

Cash and cash equivalents

 

$

5.7

 

 

$

5.7

 

 

$

5.7

 

 

$

—

 

Notes payable

 

 

1,317.0

 

 

 

1,317.0

 

 

 

—

 

 

 

1,317.0

 

Long-term debt, including current portion

 

 

3,856.9

 

 

 

3,691.5

 

 

 

—

 

 

 

3,691.5

 

As of December 31, 2024

 

 

 

 

 

 

 

 

 

 

 

 

Cash and cash equivalents

 

$

11.5

 

 

$

11.5

 

 

$

11.5

 

 

$

—

 

Notes payable

 

 

1,158.0

 

 

 

1,158.0

 

 

 

—

 

 

 

1,158.0

 

Long-term debt, including current portion

 

 

3,740.2

 

 

 

3,435.3

 

 

 

—

 

 

 

3,435.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Spire Missouri

 

 

 

 

 

 

 

 

 

 

 

 

As of December 31, 2025

 

 

 

 

 

 

 

 

 

 

 

 

Notes payable – associated companies

 

$

465.7

 

 

$

465.7

 

 

$

—

 

 

$

465.7

 

Long-term debt

 

 

2,152.7

 

 

 

2,072.5

 

 

 

—

 

 

 

2,072.5

 

As of September 30, 2025

 

 

 

 

 

 

 

 

 

 

 

 

Notes payable – associated companies

 

$

566.3

 

 

$

566.3

 

 

$

—

 

 

$

566.3

 

Long-term debt

 

 

1,953.6

 

 

 

1,874.0

 

 

 

—

 

 

 

1,874.0

 

As of December 31, 2024

 

 

 

 

 

 

 

 

 

 

 

 

Notes payable – associated companies

 

 

580.9

 

 

 

580.9

 

 

 

—

 

 

 

580.9

 

Long-term debt

 

 

1,803.6

 

 

 

1,646.3

 

 

 

—

 

 

 

1,646.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Spire Alabama

 

 

 

 

 

 

 

 

 

 

 

 

As of December 31, 2025

 

 

 

 

 

 

 

 

 

 

 

 

Notes payable – associated companies

 

$

164.6

 

 

$

164.6

 

 

$

—

 

 

$

164.6

 

Long-term debt

 

 

711.8

 

 

 

668.6

 

 

 

—

 

 

 

668.6

 

As of September 30, 2025

 

 

 

 

 

 

 

 

 

 

 

 

Cash and cash equivalents

 

$

1.9

 

 

$

1.9

 

 

$

1.9

 

 

$

—

 

Notes payable – associated companies

 

 

130.1

 

 

 

130.1

 

 

 

—

 

 

 

130.1

 

Long-term debt

 

 

711.7

 

 

 

675.9

 

 

 

—

 

 

 

675.9

 

As of December 31, 2024

 

 

 

 

 

 

 

 

 

 

 

 

Notes payable – associated companies

 

 

67.0

 

 

 

67.0

 

 

 

—

 

 

 

67.0

 

Long-term debt, including current portion

 

 

746.4

 

 

 

677.4

 

 

 

—

 

 

 

677.4