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Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
ASSETS |  |
Derivative asset after the effects of netting | $ 17.2 | $ 14.8
LIABILITIES |  |
Derivative liability after the effects of netting | 76.5 | 54.8
Spire Missouri |  |
ASSETS |  |
Derivative asset after the effects of netting | 0.0 | 0.0
LIABILITIES |  |
Derivative liability after the effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | (32.0) | (9.4)
Derivative asset after the effects of netting | 57.7 | 50.8
LIABILITIES |  |
Effects of netting and cash margin receivables/payables | (23.0) | (23.7)
Derivative liability after the effects of netting | 76.5 | 54.8
Fair Value, Measurements, Recurring | Spire Missouri |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | (6.6) |
Derivative asset after the effects of netting | 21.9 |
Fair Value, Measurements, Recurring | U.S. stock/bond mutual funds | Spire Missouri |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0
Derivative asset after the effects of netting | 21.9 | 20.5
Fair Value, Measurements, Recurring | Gasoline and heating oil contracts | Spire Missouri |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | (0.3) |
Derivative asset after the effects of netting | 0.0 |
Fair Value, Measurements, Recurring | NYMEX/ICE natural gas contracts | Spire Missouri |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | (6.3) |
Derivative asset after the effects of netting | 0.0 |
LIABILITIES |  |
Effects of netting and cash margin receivables/payables | (0.9) | (12.3)
Derivative liability after the effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Other | U.S. stock/bond mutual funds |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0
Derivative asset after the effects of netting | 18.6 | 15.5
Fair Value, Measurements, Recurring | Other | Interest Rate Swap |  |
LIABILITIES |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0
Derivative liability after the effects of netting | 54.2 | 43.4
Fair Value, Measurements, Recurring | Gas Utility | Operating Segments | U.S. stock/bond mutual funds |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | 0.0 | 0.0
Derivative asset after the effects of netting | 21.9 | 20.5
Fair Value, Measurements, Recurring | Gas Utility | Operating Segments | Gasoline and heating oil contracts |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | (0.3) |
Derivative asset after the effects of netting | 0.0 |
Fair Value, Measurements, Recurring | Gas Utility | Operating Segments | NYMEX/ICE natural gas contracts |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | (6.3) |
Derivative asset after the effects of netting | 0.0 |
LIABILITIES |  |
Effects of netting and cash margin receivables/payables | (0.9) | (12.3)
Derivative liability after the effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Gas Marketing | Operating Segments | NYMEX/ICE natural gas contracts |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | (25.4) | (6.9)
Derivative asset after the effects of netting | 2.3 | 0.5
LIABILITIES |  |
Effects of netting and cash margin receivables/payables | (22.1) | (8.9)
Derivative liability after the effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Gas Marketing | Operating Segments | Natural gas commodity contracts |  |
ASSETS |  |
Effects of netting and cash margin receivables/payables | 0.0 | (2.5)
Derivative asset after the effects of netting | 14.9 | 14.3
LIABILITIES |  |
Effects of netting and cash margin receivables/payables | 0.0 | (2.5)
Derivative liability after the effects of netting | 22.3 | 11.4
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
ASSETS |  |
Derivative asset before effects of netting | 47.1 | 36.9
LIABILITIES |  |
Derivative liability before effects of netting | 1.6 | 12.7
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 28.5 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | U.S. stock/bond mutual funds | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 21.9 | 20.5
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Gasoline and heating oil contracts | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 0.3 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | NYMEX/ICE natural gas contracts | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 6.3 |
LIABILITIES |  |
Derivative liability before effects of netting | 0.9 | 12.3
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other | U.S. stock/bond mutual funds |  |
ASSETS |  |
Derivative asset before effects of netting | 18.6 | 15.5
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other | Interest Rate Swap |  |
LIABILITIES |  |
Derivative liability before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Gas Utility | Operating Segments | U.S. stock/bond mutual funds |  |
ASSETS |  |
Derivative asset before effects of netting | 21.9 | 20.5
Fair Value, Measurements, Recurring | 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 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Gas Utility | Operating Segments | NYMEX/ICE natural gas contracts |  |
ASSETS |  |
Derivative asset before effects of netting | 6.3 |
LIABILITIES |  |
Derivative liability before effects of netting | 0.9 | 12.3
Fair Value, Measurements, Recurring | 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 | 0.9
LIABILITIES |  |
Derivative liability before effects of netting | 0.7 | 0.4
Fair Value, Measurements, Recurring | 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
LIABILITIES |  |
Derivative liability before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) |  |
ASSETS |  |
Derivative asset before effects of netting | 42.2 | 23.3
LIABILITIES |  |
Derivative liability before effects of netting | 97.9 | 65.7
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | U.S. stock/bond mutual funds | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | Gasoline and heating oil contracts | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | NYMEX/ICE natural gas contracts | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
LIABILITIES |  |
Derivative liability before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | Other | U.S. stock/bond mutual funds |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | Other | Interest Rate Swap |  |
LIABILITIES |  |
Derivative liability before effects of netting | 54.2 | 43.4
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | Gas Utility | Operating Segments | Gasoline and heating oil contracts |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | Gas Utility | Operating Segments | NYMEX/ICE natural gas contracts |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
LIABILITIES |  |
Derivative liability before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | Gas Marketing | Operating Segments | NYMEX/ICE natural gas contracts |  |
ASSETS |  |
Derivative asset before effects of netting | 27.7 | 6.5
LIABILITIES |  |
Derivative liability before effects of netting | 21.4 | 8.5
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2) | Gas Marketing | Operating Segments | Natural gas commodity contracts |  |
ASSETS |  |
Derivative asset before effects of netting | 14.5 | 16.8
LIABILITIES |  |
Derivative liability before effects of netting | 22.3 | 13.8
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
ASSETS |  |
Derivative asset before effects of netting | 0.4 | 0.0
LIABILITIES |  |
Derivative liability before effects of netting | 0.0 | 0.1
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. stock/bond mutual funds | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Gasoline and heating oil contracts | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | NYMEX/ICE natural gas contracts | Spire Missouri |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
LIABILITIES |  |
Derivative liability before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other | U.S. stock/bond mutual funds |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other | Interest Rate Swap |  |
LIABILITIES |  |
Derivative liability before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Gas Utility | Operating Segments | Gasoline and heating oil contracts |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Gas Utility | Operating Segments | NYMEX/ICE natural gas contracts |  |
ASSETS |  |
Derivative asset before effects of netting | 0.0 |
LIABILITIES |  |
Derivative liability before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | 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
LIABILITIES |  |
Derivative liability before effects of netting | 0.0 | 0.0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Gas Marketing | Operating Segments | Natural gas commodity contracts |  |
ASSETS |  |
Derivative asset before effects of netting | 0.4 | 0.0
LIABILITIES |  |
Derivative liability before effects of netting | $ 0.0 | $ 0.1

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