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Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020
--- | --- | --- | ---
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | $ (13.0) | $ (32.0) | $ (11.9)
Derivative asset after the effects of netting | 86.4 | 57.7 | 48.4
LIABILITIES |  |  |
Effects of netting and cash margin receivables/payables | (6.5) | (23.0) | (26.3)
Derivative liability after the effects of netting | 45.9 | 76.5 | 90.9
Spire Missouri |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | (0.7) | (6.6) | (0.1)
Derivative asset after the effects of netting | 23.5 | 21.9 | 18.1
LIABILITIES |  |  |
Effects of netting and cash margin receivables/payables |  |  | (12.6)
Derivative liability after the effects of netting |  |  | 0.0
U.S. stock/bond mutual funds | Spire Missouri |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0 | 0.0
Derivative asset after the effects of netting | 23.5 | 21.9 | 18.1
NYMEX/ICE natural gas contracts | Spire Missouri |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | (0.4) | (6.3) | (0.1)
Derivative asset after the effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Effects of netting and cash margin receivables/payables | (1.8) | (0.9) | (12.2)
Derivative liability after the effects of netting | 0.0 | 0.0 | 0.0
Gasoline and heating oil contracts | Spire Missouri |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | (0.3) | (0.3) |
Derivative asset after the effects of netting | 0.0 | 0.0 |
LIABILITIES |  |  |
Effects of netting and cash margin receivables/payables |  |  | (0.4)
Derivative liability after the effects of netting |  |  | 0.0
Other | U.S. stock/bond mutual funds |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0 | 0.0
Derivative asset after the effects of netting | 22.9 | 18.6 | 17.6
Other | Interest Rate Swap |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | 0.0 |  |
Derivative asset after the effects of netting | 27.9 |  |
LIABILITIES |  |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0 | 0.0
Derivative liability after the effects of netting | 21.4 | 54.2 | 66.9
Gas Utility | Operating Segments | U.S. stock/bond mutual funds |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0 | 0.0
Derivative asset after the effects of netting | 23.5 | 21.9 | 18.1
Gas Utility | Operating Segments | NYMEX/ICE natural gas contracts |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | (0.4) | (6.3) | (0.1)
Derivative asset after the effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Effects of netting and cash margin receivables/payables | (1.8) | (0.9) | (12.2)
Derivative liability after the effects of netting | 0.0 | 0.0 | 0.0
Gas Utility | Operating Segments | Gasoline and heating oil contracts |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | (0.3) | (0.3) |
Derivative asset after the effects of netting | 0.0 | 0.0 |
LIABILITIES |  |  |
Effects of netting and cash margin receivables/payables |  |  | (0.4)
Derivative liability after the effects of netting |  |  | 0.0
Gas Marketing | Operating Segments | NYMEX/ICE natural gas contracts |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | (12.3) | (25.4) | (7.0)
Derivative asset after the effects of netting | 2.8 | 2.3 | 0.0
LIABILITIES |  |  |
Effects of netting and cash margin receivables/payables | (4.7) | (22.1) | (8.9)
Derivative liability after the effects of netting | 0.0 | 0.0 | 0.0
Gas Marketing | Operating Segments | Natural gas commodity contracts |  |  |
ASSETS |  |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0 | (4.8)
Derivative asset after the effects of netting | 9.3 | 14.9 | 12.7
LIABILITIES |  |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0 | (4.8)
Derivative liability after the effects of netting | 24.5 | 22.3 | 24.0
Quoted Prices in Active Markets (Level 1) |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 47.1 | 47.1 | 36.0
LIABILITIES |  |  |
Derivative liability before effects of netting | 1.8 | 1.6 | 13.1
Quoted Prices in Active Markets (Level 1) | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 24.2 | 28.5 | 18.2
LIABILITIES |  |  |
Derivative liability before effects of netting |  |  | 12.6
Quoted Prices in Active Markets (Level 1) | U.S. stock/bond mutual funds | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 23.5 | 21.9 | 18.1
Quoted Prices in Active Markets (Level 1) | NYMEX/ICE natural gas contracts | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.4 | 6.3 | 0.1
LIABILITIES |  |  |
Derivative liability before effects of netting | 1.8 | 0.9 | 12.2
Quoted Prices in Active Markets (Level 1) | Gasoline and heating oil contracts | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.3 | 0.3 |
LIABILITIES |  |  |
Derivative liability before effects of netting |  |  | 0.4
Quoted Prices in Active Markets (Level 1) | Other | U.S. stock/bond mutual funds |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 22.9 | 18.6 | 17.6
Quoted Prices in Active Markets (Level 1) | Other | Interest Rate Swap |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 |  |
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.0 | 0.0
Quoted Prices in Active Markets (Level 1) | Gas Utility | Operating Segments | U.S. stock/bond mutual funds |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 23.5 | 21.9 | 18.1
Quoted Prices in Active Markets (Level 1) | Gas Utility | Operating Segments | NYMEX/ICE natural gas contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.4 | 6.3 | 0.1
LIABILITIES |  |  |
Derivative liability before effects of netting | 1.8 | 0.9 | 12.2
Quoted Prices in Active Markets (Level 1) | Gas Utility | Operating Segments | Gasoline and heating oil contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.3 | 0.3 |
LIABILITIES |  |  |
Derivative liability before effects of netting |  |  | 0.4
Quoted Prices in Active Markets (Level 1) | Gas Marketing | Operating Segments | NYMEX/ICE natural gas contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.2
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.7 | 0.5
Quoted Prices in Active Markets (Level 1) | Gas Marketing | Operating Segments | Natural gas commodity contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.0 | 0.0
Significant Observable Inputs (Level 2) |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 52.3 | 42.2 | 24.3
LIABILITIES |  |  |
Derivative liability before effects of netting | 50.6 | 97.9 | 103.0
Significant Observable Inputs (Level 2) | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting |  |  | 0.0
Significant Observable Inputs (Level 2) | U.S. stock/bond mutual funds | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
Significant Observable Inputs (Level 2) | NYMEX/ICE natural gas contracts | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.0 | 0.0
Significant Observable Inputs (Level 2) | Gasoline and heating oil contracts | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 |
LIABILITIES |  |  |
Derivative liability before effects of netting |  |  | 0.0
Significant Observable Inputs (Level 2) | Other | U.S. stock/bond mutual funds |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
Significant Observable Inputs (Level 2) | Other | Interest Rate Swap |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 27.9 |  |
LIABILITIES |  |  |
Derivative liability before effects of netting | 21.4 | 54.2 | 66.9
Significant Observable Inputs (Level 2) | Gas Utility | Operating Segments | U.S. stock/bond mutual funds |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
Significant Observable Inputs (Level 2) | Gas Utility | Operating Segments | NYMEX/ICE natural gas contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.0 | 0.0
Significant Observable Inputs (Level 2) | Gas Utility | Operating Segments | Gasoline and heating oil contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 |
LIABILITIES |  |  |
Derivative liability before effects of netting |  |  | 0.0
Significant Observable Inputs (Level 2) | Gas Marketing | Operating Segments | NYMEX/ICE natural gas contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 15.1 | 27.7 | 6.8
LIABILITIES |  |  |
Derivative liability before effects of netting | 4.7 | 21.4 | 8.4
Significant Observable Inputs (Level 2) | Gas Marketing | Operating Segments | Natural gas commodity contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 9.3 | 14.5 | 17.5
LIABILITIES |  |  |
Derivative liability before effects of netting | 24.5 | 22.3 | 27.7
Significant Unobservable Inputs (Level 3) |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.4 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.0 | 1.1
Significant Unobservable Inputs (Level 3) | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting |  |  | 0.0
Significant Unobservable Inputs (Level 3) | U.S. stock/bond mutual funds | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | NYMEX/ICE natural gas contracts | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Gasoline and heating oil contracts | Spire Missouri |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 |
LIABILITIES |  |  |
Derivative liability before effects of netting |  |  | 0.0
Significant Unobservable Inputs (Level 3) | Other | U.S. stock/bond mutual funds |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Other | Interest Rate Swap |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 |  |
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Gas Utility | Operating Segments | U.S. stock/bond mutual funds |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Gas Utility | Operating Segments | NYMEX/ICE natural gas contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Gas Utility | Operating Segments | Gasoline and heating oil contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 |
LIABILITIES |  |  |
Derivative liability before effects of netting |  |  | 0.0
Significant Unobservable Inputs (Level 3) | Gas Marketing | Operating Segments | NYMEX/ICE natural gas contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.0 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting | 0.0 | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Gas Marketing | Operating Segments | Natural gas commodity contracts |  |  |
ASSETS |  |  |
Derivative asset before effects of netting | 0.0 | 0.4 | 0.0
LIABILITIES |  |  |
Derivative liability before effects of netting | $ 0.0 | $ 0.0 | $ 1.1

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