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Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Preferred Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Spire Missouri [Member] | Spire Missouri [Member] Common Stock [Member] | Spire Missouri [Member] Additional Paid-in Capital [Member] | Spire Missouri [Member] Retained Earnings [Member] | Spire Missouri [Member] AOCI Attributable to Parent [Member] | Spire Alabama Inc [Member] | Spire Alabama Inc [Member] Common Stock [Member] | Spire Alabama Inc [Member] Additional Paid-in Capital [Member] | Spire Alabama Inc [Member] Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Sep. 30, 2022 |  | 52,494,543 |  |  |  |  |  | 25,325 |  |  |  |  | 1,972,052 |  |
Balance at Sep. 30, 2022 | $ 2,818.5 | $ 52.5 | $ 242.0 | $ 1,571.3 | $ 905.5 | $ 47.2 | $ 1,745.4 | $ 0.1 | $ 816.1 | $ 931.9 | $ (2.7) | $ 906.0 |  | $ 316.9 | $ 589.1
Net Income (Loss) | 217.5 |  |  |  | 217.5 |  | 117.5 |  |  | 117.5 |  | 66.0 |  |  | 66.0
Common stock issued (in shares) |  | 611,872 |  |  |  |  |  | 530 |  |  |  |  |  |  |
Common stock issued | 40.5 | $ 0.6 |  | 39.9 |  |  | 38.7 |  | 38.7 |  |  |  |  |  |
Dividend reinvestment plan (in shares) |  | 22,230 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan | 1.5 |  |  | 1.5 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation costs | 5.3 |  |  | 5.3 |  |  |  |  |  |  |  |  |  |  |
Stock issued under stock-based compensation plans (in shares) |  | 60,007 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under stock-based compensation plans |  | $ 0.1 |  | (0.1) |  |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation (in shares) |  | (18,428) |  |  |  |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation | (1.4) |  |  | (1.4) |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends | (152.5) |  |  |  | (152.5) |  | (57.0) |  |  | (57.0) |  | (13.0) |  |  | (13.0)
Preferred stock, dividends | (14.8) |  |  |  | (14.8) |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income, Net of Tax | 0.4 |  |  |  |  | 0.4 | 0.2 |  |  |  | 0.2 |  |  |  |
Temporary equity adjustment to redemption value | 2.3 |  |  |  | 2.3 |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation (in shares) |  | 18,428 |  |  |  |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation | 1.4 |  |  | 1.4 |  |  |  |  |  |  |  |  |  |  |
Return of capital to Spire |  |  |  |  |  |  |  |  |  |  |  | (31.0) |  | (31.0) |
Balance (in shares) at Sep. 30, 2023 |  | 53,170,224 |  |  |  |  |  | 25,855 |  |  |  |  | 1,972,052 |  |
Balance at Sep. 30, 2023 | 2,917.3 | $ 53.2 | 242.0 | 1,616.5 | 958.0 | 47.6 | 1,844.8 | $ 0.1 | 854.8 | 992.4 | (2.5) | 928.0 |  | 285.9 | 642.1
Net Income (Loss) | 250.9 |  |  |  | 250.9 |  | 118.4 |  |  | 118.4 |  | 80.1 |  |  | 80.1
Common stock issued (in shares) |  | 4,490,282 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued | 285.3 | $ 4.4 |  | 280.9 |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan (in shares) |  | 26,041 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan | 1.5 |  |  | 1.5 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation costs | 4.8 |  |  | 4.8 |  |  |  |  |  |  |  |  |  |  |
Stock issued under stock-based compensation plans (in shares) |  | 87,844 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under stock-based compensation plans |  | $ 0.1 |  | (0.1) |  |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation (in shares) |  | (24,724) |  |  |  |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation | (1.4) |  |  | (1.4) |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends | (172.9) |  |  |  | (172.9) |  |  |  |  |  |  | (53.3) |  |  | (53.3)
Preferred stock, dividends | (14.8) |  |  |  | (14.8) |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income, Net of Tax | (35.5) |  |  |  |  | (35.5) | 0.5 |  |  |  | 0.5 |  |  |  |
Temporary equity adjustment to redemption value | (2.5) |  |  |  | (2.5) |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation (in shares) |  | 24,724 |  |  |  |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation | 1.4 |  |  | 1.4 |  |  |  |  |  |  |  |  |  |  |
Return of capital to Spire |  |  |  |  |  |  |  |  |  |  |  | (6.5) |  | (6.5) |
Balance (in shares) at Sep. 30, 2024 |  | 57,749,667 |  |  |  |  |  | 25,855 |  |  |  |  | 1,972,052 |  |
Balance at Sep. 30, 2024 | 3,232.7 | $ 57.7 | 242.0 | 1,902.2 | 1,018.7 | 12.1 | 1,963.7 | $ 0.1 | 854.8 | 1,110.8 | (2.0) | 948.3 |  | 279.4 | 668.9
Net Income (Loss) | 271.7 |  |  |  | 271.7 |  | 128.3 |  |  | 128.3 |  | 84.9 |  |  | 84.9
Common stock issued (in shares) |  | 1,206,134 |  |  |  |  |  | 967 |  |  |  |  |  |  |
Common stock issued | 74.7 | $ 1.2 |  | 73.5 |  |  | 74.4 |  | 74.4 |  |  |  |  |  |
Dividend reinvestment plan (in shares) |  | 22,006 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan | 1.5 |  |  | 1.5 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation costs | 6.1 |  |  | 6.1 |  |  |  |  |  |  |  |  |  |  |
Stock issued under stock-based compensation plans (in shares) |  | 73,471 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under stock-based compensation plans |  | $ 0.1 |  | (0.1) |  |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation (in shares) |  | (25,317) |  |  |  |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation | (1.8) |  |  | (1.8) |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends | (185.2) |  |  |  | (185.2) |  |  |  |  |  |  | (18.6) |  |  | (18.6)
Preferred stock, dividends | (14.8) |  |  |  | (14.8) |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income, Net of Tax | 7.3 |  |  |  |  | 7.3 | 1.3 |  |  |  | 1.3 |  |  |  |
Temporary equity adjustment to redemption value | (2.8) |  |  |  | (2.8) |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation (in shares) |  | 25,317 |  |  |  |  |  |  |  |  |  |  |  |  |
Employees’ tax withholding for stock-based compensation | 1.8 |  |  | 1.8 |  |  |  |  |  |  |  |  |  |  |
Return of capital to Spire |  |  |  |  |  |  |  |  |  |  |  | (36.5) |  | (36.5) |
Balance (in shares) at Sep. 30, 2025 |  | 59,025,961 |  |  |  |  |  | 26,822 |  |  |  |  | 1,972,052 |  |
Balance at Sep. 30, 2025 | $ 3,389.4 | $ 59.0 | $ 242.0 | $ 1,981.4 | $ 1,087.6 | $ 19.4 | $ 2,167.7 | $ 0.1 | $ 929.2 | $ 1,239.1 | $ (0.7) | $ 978.1 |  | $ 242.9 | $ 735.2

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