CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Net Income	$ 173.6	$ 187.4	$ 229.3	$ 276.3
Cash flow hedging derivative instruments:
Net hedging gain arising during the period	18.7	43.5	13.9	60.7
Amounts reclassified into net income	(0.4)	(0.4)	(0.7)	(0.7)
Net gain on cash flow hedging derivative instruments	18.3	43.1	13.2	60.0
Net gain on defined benefit pension and other postretirement plans	0.1	0.2	0.2	0.2
Net unrealized loss on available for sale securities	(0.1)	(0.1)	(0.2)	(0.1)
Other Comprehensive Income, Before Tax	18.3	43.2	13.2	60.1
Other Comprehensive Income, Net of Tax	14.0	33.4	10.1	46.5
Comprehensive Income	187.6	220.8	239.4	322.8
Income Tax Expense Related to Items of Other Comprehensive Income	4.3	9.8	3.1	13.6
Other Comprehensive Income, Net of Tax	14.0	33.4	10.1	46.5
Comprehensive Income	187.6	220.8	239.4	322.8
Operating Revenues	880.9	1,104.9	1,436.3	1,617.5
Operating Expenses:
Natural gas	392.0	619.1	641.2	800.3
Operation and maintenance	113.2	119.0	229.6	230.6
Depreciation and amortization	58.9	51.5	115.8	102.3
Taxes, other than income taxes	71.6	57.9	109.2	94.0
Total Operating Expenses	635.7	847.5	1,095.8	1,227.2
Operating Income	245.2	257.4	340.5	390.3
Interest Expense, Net	27.5	25.8	56.1	51.5
Other (Expense) Income, Net	(3.4)	1.8	4.0	6.1
Income Before Income Taxes	214.3	233.4	288.4	344.9
Income Tax Expense	40.7	46.0	59.1	68.6
Net Income	173.6	187.4	229.3	276.3
Spire Missouri
Net Income	98.2	93.1	143.5	149.7
Cash flow hedging derivative instruments:
Other Comprehensive Income, Net of Tax	0.1	0.1	0.2	0.2
Comprehensive Income	98.3	93.2	143.7	149.9
Other Comprehensive Income, Net of Tax	0.1	0.1	0.2	0.2
Comprehensive Income	98.3	93.2	143.7	149.9
Operating Revenues	571.2	790.9	919.1	1,146.4
Operating Expenses:
Natural gas	287.8	537.4	444.1	699.0
Operation and maintenance	64.3	62.8	130.6	125.7
Depreciation and amortization	35.9	31.0	70.1	61.4
Taxes, other than income taxes	53.0	38.9	78.7	64.0
Total Operating Expenses	441.0	670.1	723.5	950.1
Operating Income	130.2	120.8	195.6	196.3
Interest Expense, Net	14.2	11.7	28.7	23.4
Other (Expense) Income, Net	(2.4)	0.8	3.5	3.5
Income Before Income Taxes	113.6	109.9	170.4	176.4
Income Tax Expense	15.4	16.8	26.9	26.7
Net Income	$ 98.2	$ 93.1	$ 143.5	$ 149.7