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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Sep. 30, 2024
Notes Tables  
Schedule Of Capital Expenditure Excluded From Statement Of Cash Flow [Table Text Block]

September 30

 

2024

  

2023

  

2022

 

Spire

 $116.5  $104.3  $77.8 

Spire Missouri

  67.4   56.5   45.6 

Spire Alabama

  14.1   4.6   19.2 
Schedule of Asset Retirement Obligations [Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 
  

2024

  

2023

  

2024

  

2023

  

2024

  

2023

 

Asset retirement obligations, beginning of year

 $577.4  $520.9  $111.1  $110.6  $451.0  $398.7 

Liabilities incurred during the period

  2.5   7.9   0.4   0.9   1.4   2.0 

Liabilities settled during the period

  (6.5)  (6.8)  (2.9)  (2.5)  (1.3)  (2.5)

Accretion

  24.8   21.5   4.5   4.5   19.6   16.5 

Revisions in estimated cash flows

  (18.3)  33.9   (17.4)  (2.4)  (2.1)  36.3 

Asset retirement obligations, end of year

 $579.9  $577.4  $95.7  $111.1  $468.6  $451.0 
Schedule of Related Party Transactions [Table Text Block]
  

Spire Missouri

  

Spire Alabama

 
  

2024

  

2023

  

2022

  

2024

  

2023

  

2022

 

Natural gas purchases from Spire Marketing

 $13.9  $57.4  $86.3  $6.7  $4.7  $3.2 

Natural gas sales to Spire Marketing

  1.7   0.4            0.5 

Transportation services from Spire STL Pipeline LLC

  32.5   32.0   32.0          

Natural gas storage services from Spire Storage Salt Plains LLC

  0.7   0.7             

Transportation services from Spire MoGas Pipeline LLC

  4.8                
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 
  

2024

  

2023

  

2022

  

2024

  

2023

  

2022

  

2024

  

2023

  

2022

 

Allowance at beginning of year

 $32.5  $31.9  $30.3  $26.2  $24.9  $22.6  $5.7  $6.3  $6.6 

Provision for expected credit losses

  23.0   16.6   11.6   19.0   13.3   11.2   3.2   2.6   0.3 

Write-offs, net of recoveries

  (24.1)  (16.0)  (10.0)  (20.3)  (12.0)  (8.9)  (3.2)  (3.2)  (0.6)

Allowance at end of year

 $31.4  $32.5  $31.9  $24.9  $26.2  $24.9  $5.7  $5.7  $6.3