XML 56 R38.htm IDEA: XBRL DOCUMENT
v3.23.3

Note 12 - Income Taxes (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2023
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Federal: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | 0.7 |  |  | $ | 0.5 |  |  | $ | 0.2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Deferred |  |  | 30.4 |  |  |  | 47.0 |  |  |  | 49.5 |  |  |  | 10.1 |  |  |  | 18.2 |  |  |  | 22.0 |  |  |  | 15.8 |  |  |  | 18.1 |  |  |  | 19.8 |
Investment tax credits |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | — |  |  |  | — |  |  |  | — |
State and local: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 1.2 |  |  |  | 0.5 |  |  |  | 1.3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Deferred |  |  | 6.7 |  |  |  | 11.1 |  |  |  | 17.7 |  |  |  | 1.7 |  |  |  | 3.3 |  |  |  | 3.5 |  |  |  | 4.5 |  |  |  | 5.1 |  |  |  | 5.2 |
Total income tax expense |  | $ | 38.8 |  |  | $ | 58.9 |  |  | $ | 68.5 |  |  | $ | 11.6 |  |  | $ | 21.3 |  |  | $ | 25.3 |  |  | $ | 20.3 |  |  | $ | 23.2 |  |  | $ | 25.0 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
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 |  |  | 3.7 |  |  |  | 3.6 |  |  |  | 3.6 |  |  |  | 2.6 |  |  |  | 2.6 |  |  |  | 2.6 |  |  |  | 4.1 |  |  |  | 4.1 |  |  |  | 4.1 |
Certain expenses capitalized on books and deducted on tax return |  |  | (1.4 | ) |  |  | (1.6 | ) |  |  | (1.6 | ) |  |  | (2.7 | ) |  |  | (3.2 | ) |  |  | (3.3 | ) |  |  | — |  |  |  | — |  |  |  | — |
Taxes related to prior years |  |  | — |  |  |  | (0.3 | ) |  |  | (0.5 | ) |  |  |  |  |  |  | (0.6 | ) |  |  | (0.2 | ) |  |  | — |  |  |  | — |  |  |  | — |
Tax credits * |  |  | (3.3 | ) |  |  | — |  |  |  | — |  |  |  | (4.2 | ) |  |  | — |  |  |  | — |  |  |  | (1.9 | ) |  |  | — |  |  |  | — |
Amortization of excess deferred taxes |  |  | (5.1 | ) |  |  | (3.5 | ) |  |  | (2.5 | ) |  |  | (7.7 | ) |  |  | (7.3 | ) |  |  | (5.0 | ) |  |  | 0.2 |  |  |  | — |  |  |  | — |
Other items – net ** |  |  | 0.2 |  |  |  | 1.9 |  |  |  | 0.1 |  |  |  | — |  |  |  | 3.1 |  |  |  | (0.2 | ) |  |  | 0.1 |  |  |  | 0.2 |  |  |  | 0.2 |
Effective income tax rate |  |  | 15.1 | % |  |  | 21.1 | % |  |  | 20.1 | % |  |  | 9.0 | % |  |  | 15.6 | % |  |  | 14.9 | % |  |  | 23.5 | % |  |  | 25.3 | % |  |  | 25.3 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves not currently deductible |  | $ | 27.7 |  |  | $ | 33.5 |  |  | $ | — |  |  | $ | 4.0 |  |  | $ | 3.9 |  |  | $ | 7.4 |
Pension and other postretirement benefits |  |  | 64.4 |  |  |  | 72.6 |  |  |  | 44.7 |  |  |  | 52.6 |  |  |  | 17.0 |  |  |  | — |
Goodwill |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 58.8 |  |  |  | 73.0 |
Operating losses |  |  | 239.2 |  |  |  | 255.1 |  |  |  | 89.2 |  |  |  | 116.9 |  |  |  | 159.8 |  |  |  | 140.3 |
Regulatory amount due to customers, net |  |  | 30.4 |  |  |  | 34.5 |  |  |  | 27.6 |  |  |  | 30.7 |  |  |  | — |  |  |  | — |
Other |  |  | 35.8 |  |  |  | 24.9 |  |  |  | 10.5 |  |  |  | — |  |  |  | 3.0 |  |  |  | — |
Total deferred tax assets |  |  | 397.5 |  |  |  | 420.6 |  |  |  | 172.0 |  |  |  | 204.2 |  |  |  | 242.5 |  |  |  | 220.7 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Relating to property |  |  | (788.0 | ) |  |  | (740.0 | ) |  |  | (507.7 | ) |  |  | (489.3 | ) |  |  | (218.7 | ) |  |  | (201.6 | )
Regulatory pension and other postretirement benefits |  |  | (80.6 | ) |  |  | (92.8 | ) |  |  | (53.0 | ) |  |  | (72.3 | ) |  |  | (25.9 | ) |  |  | (1.6 | )
Deferred gas costs |  |  | (67.0 | ) |  |  | (75.8 | ) |  |  | (64.1 | ) |  |  | (74.0 | ) |  |  | — |  |  |  | — |
Other *** |  |  | (205.6 | ) |  |  | (187.1 | ) |  |  | (79.0 | ) |  |  | (68.7 | ) |  |  | (7.0 | ) |  |  | (6.5 | )
Total deferred tax liabilities |  |  | (1,141.2 | ) |  |  | (1,095.7 | ) |  |  | (703.8 | ) |  |  | (704.3 | ) |  |  | (251.6 | ) |  |  | (209.7 | )
Net deferred tax (liability) asset |  | $ | (743.7 | ) |  | $ | (675.1 | ) |  | $ | (531.8 | ) |  | $ | (500.1 | ) |  | $ | (9.1 | ) |  | $ | 11.0 |
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 |  | $ | 1,000.3 |  |  | $ | 352.4 |  |  | $ | 624.1 |
Contribution carryforwards |  |  | 6.1 |  |  |  | 5.6 |  |  |  | - |
Tax credit carryforwards |  |  | 13.1 |  |  |  | 8.5 |  |  |  | 1.6 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Unrecognized tax benefits, beginning of year |  | $ | 19.6 |  |  | $ | 16.4 |  |  | $ | 13.2 |  |  | $ | 19.3 |  |  | $ | 16.1 |  |  | $ | 13.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Increases related to tax positions taken in current year |  |  | 4.2 |  |  |  | 3.3 |  |  |  | 3.2 |  |  |  | 3.6 |  |  |  | 3.2 |  |  |  | 3.1 |  |  |  | 0.3 |  |  |  | — |  |  |  | — |
Reductions due to lapse of applicable statute of limitations |  |  | — |  |  |  | (0.1 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Unrecognized tax benefits, end of year |  | $ | 23.8 |  |  | $ | 19.6 |  |  | $ | 16.4 |  |  | $ | 22.9 |  |  | $ | 19.3 |  |  | $ | 16.1 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |

X
- Definition Tabular disclosure of federal and state loss and contribution and tax credit carryforwards. + References No definition available. + Details
Name: | sr_SummaryOfFederalAndStateLossAndContributionAndTaxCreditCarryforwardsTableTextBlock
Namespace Prefix: | sr_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 9 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-9 + Details
Name: | us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
Name: | us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration