CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating Activities:
Net Income	$ 281.6	$ 108.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	155.4	146.8
Deferred income taxes and investment tax credits	68.4	17.0
Impairments	0.0	148.6
Changes in assets and liabilities:
Accounts receivable	(248.6)	41.5
Inventories	(22.4)	45.4
Regulatory assets and liabilities	(3.1)	67.5
Accounts payable	79.7	(72.3)
Delayed/advance customer billings, net	(34.8)	(16.4)
Taxes accrued	(3.3)	(8.9)
Other assets and liabilities	(61.7)	(28.8)
Other	9.5	5.1
Net cash provided by operating activities	220.7	453.8
Investing Activities:
Capital expenditures	(463.2)	(475.7)
Other	1.5	5.6
Net cash used in investing activities	(461.7)	(470.1)
Financing Activities:
Issuance of long-term debt	629.1	510.0
Repayment of long-term debt	(60.4)	(147.0)
Repayment of short-term debt, net	(187.0)	(265.6)
Issuance of common stock	0.6	33.2
Dividends paid on common stock	(99.6)	(95.7)
Dividends paid on preferred stock	(11.1)	(11.1)
Other	(10.8)	(5.9)
Net cash provided by financing activities	260.8	17.9
Net Increase in Cash and Cash Equivalents	19.8	1.6
Cash and Cash Equivalents at Beginning of Period	4.1	5.8
Cash and Cash Equivalents at End of Period	23.9	7.4
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(65.9)	(63.9)
Income taxes	(0.4)	(2.6)
Spire Missouri
Operating Activities:
Net Income	152.8	129.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	93.0	88.0
Deferred income taxes and investment tax credits	26.7	16.8
Changes in assets and liabilities:
Accounts receivable	(212.1)	(5.8)
Inventories	(36.0)	28.8
Regulatory assets and liabilities	(17.9)	57.9
Accounts payable	(1.1)	(1.0)
Delayed/advance customer billings, net	(34.8)	(8.7)
Taxes accrued	(5.2)	(5.5)
Other assets and liabilities	(95.8)	(13.3)
Other	0.5	0.5
Net cash provided by operating activities	(129.9)	286.7
Investing Activities:
Capital expenditures	(279.2)	(253.3)
Other	1.1	0.3
Net cash used in investing activities	(278.1)	(253.0)
Financing Activities:
Issuance of long-term debt	304.1	275.0
Repayment of long-term debt	(55.0)	(107.0)
Issuance of short-term debt, net	250.0	0.0
Repayments to Spire, net	(83.7)	(168.1)
Dividends paid on common stock	0.0	(33.9)
Other	(3.1)	(1.6)
Net cash provided by financing activities	412.3	(35.6)
Net Increase in Cash and Cash Equivalents	4.3	(1.9)
Cash and Cash Equivalents at Beginning of Period	0.0	2.6
Cash and Cash Equivalents at End of Period	4.3	0.7
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(33.1)	(32.6)
Income taxes	0.0	0.0
Spire Alabama
Operating Activities:
Net Income	83.5	74.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	46.3	43.9
Deferred income taxes and investment tax credits	28.3	25.2
Changes in assets and liabilities:
Accounts receivable	(10.4)	2.3
Inventories	(3.3)	15.3
Regulatory assets and liabilities	7.1	6.7
Accounts payable	1.9	(19.8)
Delayed/advance customer billings, net	(0.1)	(7.3)
Taxes accrued	(0.2)	(0.7)
Other assets and liabilities	(8.2)	(8.6)
Other	0.2	0.1
Net cash provided by operating activities	145.1	131.7
Investing Activities:
Capital expenditures	(125.5)	(111.5)
Other	0.6	1.4
Net cash used in investing activities	(124.9)	(110.1)
Financing Activities:
Issuance of long-term debt	150.0	100.0
Repayment of long-term debt	0.0	(40.0)
Return of capital to Spire	(22.0)	(20.0)
Repayments to Spire, net	(121.3)	(43.1)
Dividends paid on common stock	(16.5)	(18.0)
Other	(0.9)	(0.5)
Net cash provided by financing activities	(10.7)	(21.6)
Net Increase in Cash and Cash Equivalents	9.5	0.0
Cash and Cash Equivalents at Beginning of Period	0.0	0.0
Cash and Cash Equivalents at End of Period	9.5	0.0
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(13.2)	(14.1)
Income taxes	$ 0.0	$ 0.0