Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Net Income	$ 95.0	$ 81.3
Other Comprehensive Income, Before Tax:
Net hedging gain arising during the period	4.5	17.6
Amounts reclassified into net income	(1.1)	(1.7)
Net gain on cash flow hedging derivative instruments	3.4	15.9
Net gain on defined benefit pension and other postretirement plans	0.0	0.1
Other Comprehensive Income, Before Tax	3.4	16.0
Income Tax Expense Related to Items of Other Comprehensive Income	0.7	3.7
Other Comprehensive Income, Net of Tax	2.7	12.3
Comprehensive Income	97.7	93.6
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, Net	5.3	0.6
Income Before Income Taxes	118.4	101.4
Income Tax expense	23.4	20.1
Net Income (Loss)	95.0	81.3
Other Comprehensive Income, Net of Tax	2.7	12.3
Comprehensive Income	97.7	93.6
Spire Missouri [Member]
Net Income	77.2	53.4
Other Comprehensive Income, Before Tax:
Other Comprehensive Income, Net of Tax	0.0	0.1
Comprehensive Income	77.2	53.5
Operating Revenues	516.4	457.5
Operating Expenses:
Natural gas	224.1	213.6
Operation and maintenance	79.7	76.2
Depreciation and amortization	52.8	45.7
Taxes, other than income taxes	41.8	36.6
Total Operating Expenses	398.4	372.1
Operating Income	118.0	85.4
Interest Expense, Net	27.4	25.3
Other Income, Net	2.0	1.5
Income Before Income Taxes	92.6	61.6
Income Tax expense	15.4	8.2
Net Income (Loss)	77.2	53.4
Other Comprehensive Income, Net of Tax	0.0	0.1
Comprehensive Income	$ 77.2	$ 53.5