Schedule of Assets (Held at End of Year) (Details) - EBP 009 - USD ($)
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12 Months Ended |
Dec. 31, 2025 |
Dec. 31, 2024 |
| EBP, Schedule of Asset Held for Investment [Line Items] |
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| Entity Tax Identification Number |
47-4582725
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| EBP, Plan Number |
009
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| Current Value |
$ 760,079,577
|
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| Notes receivable from participants |
15,574,168
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| Total Asset Held for Investment |
$ 775,653,745
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| Investment, Identifier [Axis]: American Funds EuroPacific Growth Fund® - Class R6 | Mutual Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
American Funds EuroPacific Growth Fund [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
181,142.034
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| Current Value |
$ 10,973,584
|
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| Investment, Identifier [Axis]: BlackRock Equity Index M | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
BlackRock Equity Index M [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
1,941,508.023
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| Current Value |
$ 122,411,304
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| Investment, Identifier [Axis]: BlackRock MSCI ACWI ex-US IMI Index Fund T | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
BlackRock MSCI ACWI ex-US IMI Index Fund T [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
652,860.037
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| Current Value |
$ 12,725,483
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| Investment, Identifier [Axis]: BlackRock Money Market Fund W | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
BlackRock Money Market Fund W [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
22,742,612.51
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| Current Value |
$ 22,742,613
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| Investment, Identifier [Axis]: DFA Emerging Markets Core Equity Portfolio | Mutual Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
DFA Emerging Markets [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
159,277.049
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| Current Value |
$ 4,631,777
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| Investment, Identifier [Axis]: Delaware Small Cap Value Fund Class R6 |Mutual Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Delaware Small Cap Value Fund [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
82,404.02
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| Current Value |
$ 5,534,254
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| Investment, Identifier [Axis]: Fidelity Mid Cap Index Fund | Mutual Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Mid Cap Index Fund [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
351,509.282
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| Current Value |
$ 12,981,238
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Fidelity Small Cap Index Fund | Mutual Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Small Cap Index Fund [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
1,106,480.04
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| Current Value |
$ 34,223,428
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Galliard Stable Return Fund C | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Galliard Stable Return Fund C [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
160,096.053
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| Current Value |
$ 10,143,686
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| Investment, Identifier [Axis]: JP Morgan Large Cap Growth Fund Class R6 | Mutual Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
JP Morgan Large Cap Growth Fund Class R6 [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
667,587.409
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| Current Value |
$ 57,706,256
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| Investment, Identifier [Axis]: Lord Abbett Total Return Trust II Class BP | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Lord Abbett Total Return Trust II Class BP [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
1,820,751.929
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| Current Value |
$ 22,086,449
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| Investment, Identifier [Axis]: PIMCO International Bond Fund | Mutual Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
PIMCO International Bond Fund [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
221,034.933
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| Current Value |
$ 2,194,877
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| Investment, Identifier [Axis]: Principal Diversified Real Asset CIT Tier 1 | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Principal Diversified Real Asset CIT Tier 1 [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
104,058.083
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| Current Value |
$ 1,667,010
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| Investment, Identifier [Axis]: Self-Directed Brokerage Accounts | Common Stock, Exchange-Traded Funds (ETFs), Trusts, Mutual Funds |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
EBP, Self-Directed Brokerage Account [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Stock, Exchange-Traded Funds (ETFs), Trusts, Mutual Funds [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Current Value |
$ 9,528,697
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| Investment, Identifier [Axis]: Spire Inc. - ESOP | Company stock fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Spire Inc ESOP [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanEmployerCommonStockFundMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
663,069.598
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| Current Value |
$ 54,835,856
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| Investment, Identifier [Axis]: Vanguard Institutional Target 2020 Fund | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
140,489.879
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| Current Value |
$ 7,392,577
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| Investment, Identifier [Axis]: Vanguard Institutional Target 2025 Fund | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
477,239.384
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| Current Value |
$ 27,049,928
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| Investment, Identifier [Axis]: Vanguard Institutional Target 20250 Fund | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Investment, Number of Shares |
697,567.43
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| Current Value |
$ 52,212,922
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| Investment, Identifier [Axis]: Vanguard Institutional Target 2030 Fund | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Investment, Number of Shares |
665,374.521
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| Current Value |
$ 39,529,900
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| Investment, Identifier [Axis]: Vanguard Institutional Target 2035 Fund | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Investment, Number of Shares |
856,675.71
|
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| Current Value |
$ 54,381,774
|
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| Investment, Identifier [Axis]: Vanguard Institutional Target 2040 Fund | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Investment, Number of Shares |
845,308.472
|
|
| Current Value |
$ 58,123,411
|
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| Investment, Identifier [Axis]: Vanguard Institutional Target 2045 Fund | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Investment, Number of Shares |
851,547.462
|
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| Current Value |
$ 61,762,737
|
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| Investment, Identifier [Axis]: Vanguard Institutional Target 2055 Fund | Common / Collective Trust |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Investment, Number of Shares |
387,741.364
|
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| Current Value |
$ 38,874,949
|
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| Investment, Identifier [Axis]: Vanguard Institutional Target 2060 Fund | Common / Collective Trust |
|
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Investment, Number of Shares |
309,345.179
|
|
| Current Value |
$ 24,481,577
|
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| Investment, Identifier [Axis]: Vanguard Institutional Target 2065 Fund | Common / Collective Trust |
|
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Investment, Number of Shares |
153,215.484
|
|
| Current Value |
$ 7,464,658
|
|
| Investment, Identifier [Axis]: Vanguard Institutional Target 2070 Fund | Common / Collective Trust |
|
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Investment, Number of Shares |
32,176.656
|
|
| Current Value |
$ 956,290
|
|
| Investment, Identifier [Axis]: Vanguard Institutional Target Income Fund | Common / Collective Trust |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Vanguard Institutional [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Investment, Number of Shares |
69,094.808
|
|
| Current Value |
$ 3,462,341
|
|
| Minimum |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| Employee benefit plan, participant loans interest rate |
4.25%
|
4.25%
|
| Maximum |
|
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| Employee benefit plan, participant loans interest rate |
9.50%
|
9.50%
|