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Note Payables and Credit Agreements - Schedule of Spire Missouri and Alabama Short-term Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019
Spire |  |
Short-term Debt [Line Items] |  |
Weighted average borrowings | $ 576.2 |
Lowest borrowings outstanding | 432.6 |
Highest borrowings outstanding | $ 856.6 |
Weighted average interest rate | 1.70% |
Borrowings outstanding | $ 648.0 | $ 743.2
Weighted average interest rate | 0.60% | 2.30%
Revolving Credit Facility Borrowings | Spire |  |
Short-term Debt [Line Items] |  |
Weighted average borrowings | $ 0.1 |
Highest borrowings outstanding | $ 23.1 |
Weighted average interest rate | 1.90% |
Commercial Paper Notes | Spire |  |
Short-term Debt [Line Items] |  |
Weighted average borrowings | $ 476.1 |
Lowest borrowings outstanding | 73.5 |
Highest borrowings outstanding | $ 856.6 |
Weighted average interest rate | 1.70% |
Borrowings outstanding | $ 498.0 | $ 743.2
Weighted average interest rate | 0.20% | 2.30%
Term Loan | Spire |  |
Short-term Debt [Line Items] |  |
Weighted average borrowings | $ 77.5 |
Highest borrowings outstanding | $ 150.0 |
Weighted average interest rate | 1.60% |
Borrowings outstanding | $ 150.0 |
Weighted average interest rate | 1.10% |
Spire Missouri | Revolving Credit Facility Borrowings |  |
Short-term Debt [Line Items] |  |
Weighted average borrowings | $ 17.9 |
Highest borrowings outstanding | $ 185.1 |
Weighted average interest rate | 1.90% |
Spire Missouri | Spire Note |  |
Short-term Debt [Line Items] |  |
Weighted average borrowings | $ 242.0 |
Lowest borrowings outstanding | 16.0 |
Highest borrowings outstanding | $ 429.5 |
Weighted average interest rate | 1.50% |
Borrowings outstanding | $ 301.2 | $ 386.4
Weighted average interest rate | 0.20% | 2.30%
Spire Alabama | Revolving Credit Facility Borrowings |  |
Short-term Debt [Line Items] |  |
Weighted average borrowings | $ 4.6 |
Highest borrowings outstanding | $ 50.0 |
Weighted average interest rate | 1.90% |
Spire Alabama | Spire Note |  |
Short-term Debt [Line Items] |  |
Weighted average borrowings | $ 89.0 |
Lowest borrowings outstanding | 18.5 |
Highest borrowings outstanding | $ 161.3 |
Weighted average interest rate | 1.40% |
Borrowings outstanding | $ 121.3 | $ 128.7
Weighted average interest rate | 0.20% | 2.30%

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