Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Operating Revenues	$ 762.2	$ 669.1
Operating Expenses:
Natural gas	312.7	270.0
Operation and maintenance	139.9	129.3
Depreciation and amortization	81.4	72.3
Taxes, other than income taxes	54.7	48.7
Total Operating Expenses	588.7	520.3
Operating Income	173.5	148.8
Interest Expense, Net	60.4	48.0
Other Income (Expense), Net	5.3	0.6
Income Before Income Taxes	118.4	101.4
Income Tax expense	23.4	20.1
Net Income	95.0	81.3
Provision for preferred dividends	3.7	3.7
Income allocated to participating securities	0.1	0.1
Income Available to Common Shareholders	$ 91.2	$ 77.5
Weighted Average Number of Common Shares Outstanding:
Basic (in shares)	59.0	57.7
Diluted (in shares)	59.2	57.9
Basic Earnings Per Common Share (in dollars per share)	$ 1.55	$ 1.34
Diluted Earnings Per Common Share (in dollars per share)	$ 1.54	$ 1.34
Spire Alabama Inc [Member]
Operating Revenues	$ 141.7	$ 120.4
Operating Expenses:
Natural gas	49.3	32.7
Operation and maintenance	32.4	31.9
Depreciation and amortization	17.4	17.8
Taxes, other than income taxes	9.6	8.6
Total Operating Expenses	108.7	91.0
Operating Income	33.0	29.4
Interest Expense, Net	7.5	7.8
Other Income (Expense), Net	0.6	(0.7)
Income Before Income Taxes	26.1	20.9
Income Tax expense	6.5	5.2
Net Income	$ 19.6	$ 15.7