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Note 6 - Long-term Debt - Maturities of Long-term Debt (Details)
$ in Millions
Sep. 30, 2024
USD ($)
2023 $ 42.0
2024 487.5
2025 108.1
2026 53.6
2027 28.5
Spire Missouri [Member]  
2023 0.0
2024 0.0
2025 0.0
2026 45.0
2027 19.3
Spire Alabama Inc [Member]  
2023 35.0
2024 0.0
2025 0.0
2026 0.0
2027 $ 0.0