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Note 12 - Income Taxes (Tables)
12 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 
  

2022

  

2021

  

2020

  

2022

  

2021

  

2020

  

2022

  

2021

  

2020

 

Federal:

                                    

Current

 $0.5  $0.2  $0.4  $  $  $  $  $  $ 

Deferred

  47.0   49.5   5.8   18.2   22.0   14.9   18.1   19.8   17.4 

Investment tax credits

  (0.2)  (0.2)  (0.2)  (0.2)  (0.2)  (0.2)         

State and local:

                                    

Current

  0.5   1.3   3.0         0.1          

Deferred

  11.1   17.7   3.4   3.3   3.5   2.5   5.1   5.2   4.6 

Total income tax expense

 $58.9  $68.5  $12.4  $21.3  $25.3  $17.3  $23.2  $25.0  $22.0 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 
  

2022

  

2021

  

2020

  

2022

  

2021

  

2020

  

2022

  

2021

  

2020

 

Federal income tax statutory rate

  21.0%  21.0%  21.0%  21.0%  21.0%  21.0%  21.0%  21.0%  21.0%

State and local income taxes, net of federal income tax benefits

  3.6   3.6   9.0   2.6   2.6   2.6   4.1   4.1   4.1 

Certain expenses capitalized on books and deducted on tax return

  (1.6)  (1.6)  (6.6)  (3.2)  (3.3)  (4.6)         

Taxes related to prior years

  (0.3)  (0.5)  (1.8)  (0.6)  (0.2)  (1.4)        0.1 

Amortization of excess deferred taxes

  (3.5)  (2.5)  (8.3)  (7.3)  (5.0)  (5.7)         

Other items – net *

  1.9   0.1   (1.0)  3.1   (0.2)  (0.2)  0.2   0.2   (0.1)

Effective income tax rate

  21.1%  20.1%  12.3%  15.6%  14.9%  11.7%  25.3%  25.3%  25.1%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 
  

2022

  

2021

  

2022

  

2021

  

2022

  

2021

 

Deferred tax assets:

                        

Reserves not currently deductible

 $33.5  $18.3  $4.0  $8.5  $7.4  $6.6 

Pension and other postretirement benefits

  72.6   77.4   52.6   53.4       

Goodwill

              73.0   87.2 

Operating losses

  255.1   264.5   116.9   110.3   140.3   130.3 

Regulatory amount due to customers, net

  34.5   33.2   30.7   29.4       

Other

  24.9   32.4             

Deferred tax assets

  420.6   425.8   204.2   201.6   220.7   224.1 

Less: Valuation allowance

     (0.5)     (0.4)      

Total deferred tax assets

  420.6   425.3   204.2   201.2   220.7   224.1 

Deferred tax liabilities:

                        

Relating to property

  (740.0)  (693.9)  (489.3)  (464.0)  (201.6)  (182.7)

Regulatory pension and other postretirement benefits

  (92.8)  (95.6)  (72.3)  (71.2)  (1.6)  (1.6)

Deferred gas costs

  (75.8)  (81.1)  (74.0)  (79.5)      

Other**

  (187.1)  (167.0)  (68.7)  (66.5)  (6.5)  (5.6)

Total deferred tax liabilities

  (1,095.7)  (1,037.6)  (704.3)  (681.2)  (209.7)  (189.9)

Net deferred tax (liability) asset

 $(675.1) $(612.3) $(500.1) $(480.0) $11.0  $34.2 
Summary of Federal and State Loss and Contribution and Tax Credit Carryforwards[Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 

Federal and state loss carryforwards

 $1,047.7  $462.3  $556.7 

Contribution carryforwards

  10.4   7.0   0.4 

Tax credit carryforwards

  4.6   3.4    
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
  

Spire

  

Spire Missouri

 
  

2022

  

2021

  

2020

  

2022

  

2021

  

2020

 

Unrecognized tax benefits, beginning of year

 $16.4  $13.2  $10.7  $16.1  $13.0  $10.4 

Increases related to tax positions taken in current year

  3.3   3.2   2.6   3.2   3.1   2.6 

Reductions due to lapse of applicable statute of limitations

  (0.1)     (0.1)         

Unrecognized tax benefits, end of year

 $19.6  $16.4  $13.2  $19.3  $16.1  $13.0