CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net Income	$ 55.7	$ 88.9
Cash flow hedging derivative instruments:
Net hedging (loss) gain arising during the period	(4.8)	17.2
Amounts reclassified into net income	(0.3)	(0.3)
Net (loss) gain on cash flow hedging derivative instruments	(5.1)	16.9
Net gain on defined benefit pension and other postretirement plans	0.1
Net unrealized loss on available for sale securities	(0.1)
Other Comprehensive (Loss) Income, Before Tax	(5.1)	16.9
Income Tax (Benefit) Expense Related to Items of Other Comprehensive Income	(1.2)	3.8
Other Comprehensive (Loss) Income, Net of Tax	(3.9)	13.1
Comprehensive Income	51.8	102.0
Operating Revenues	555.4	512.6
Operating Expenses:
Natural gas	249.2	181.2
Operation and maintenance	116.4	111.6
Depreciation and amortization	56.9	50.8
Taxes, other than income taxes	37.6	36.1
Total Operating Expenses	460.1	379.7
Operating Income	95.3	132.9
Interest Expense, Net	28.6	25.7
Other Income, Net	7.4	4.3
Income Before Income Taxes	74.1	111.5
Income Tax Expense	18.4	22.6
Net Income	55.7	88.9
Spire Missouri
Net Income	45.3	56.6
Cash flow hedging derivative instruments:
Other Comprehensive (Loss) Income, Net of Tax	0.1	0.1
Comprehensive Income	45.4	56.7
Operating Revenues	347.9	355.5
Operating Expenses:
Natural gas	156.3	161.6
Operation and maintenance	66.3	62.9
Depreciation and amortization	34.2	30.4
Taxes, other than income taxes	25.7	25.1
Total Operating Expenses	282.5	280.0
Operating Income	65.4	75.5
Interest Expense, Net	14.5	11.7
Other Income, Net	5.9	2.7
Income Before Income Taxes	56.8	66.5
Income Tax Expense	11.5	9.9
Net Income	$ 45.3	$ 56.6