CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities:
Net Income	$ 108.3	$ 218.9
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	146.8	134.9
Deferred income taxes and investment tax credits	17.0	42.6
Impairments	148.6	0.0
Changes in assets and liabilities:
Accounts receivable	41.5	(44.6)
Inventories	45.4	52.1
Regulatory assets and liabilities	67.5	82.1
Accounts payable	(72.3)	11.3
Delayed/advance customer billings, net	(16.4)	(23.5)
Taxes accrued	(8.9)	(7.1)
Other assets and liabilities	(28.8)	(24.2)
Other	5.1	(1.9)
Net cash provided by operating activities	453.8	440.6
Investing Activities:
Capital expenditures	(475.7)	(608.5)
Business acquisitions	0.0	(7.9)
Other	5.6	(7.1)
Net cash used in investing activities	(470.1)	(623.5)
Financing Activities:
Issuance of preferred stock	0.0	242.0
Issuance of long-term debt	510.0	190.0
Repayment of long-term debt	(147.0)	(59.1)
Repayment of short-term debt, net	(265.6)	(119.6)
Issuance of common stock	33.2	5.7
Dividends paid on common stock	(95.7)	(88.9)
Dividends paid on preferred stock	(11.1)	0.0
Other	(5.9)	(2.8)
Net cash provided by financing activities	17.9	167.3
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	1.6	(15.6)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	5.8	21.4
Cash and Cash Equivalents at End of Period	7.4	5.8
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(63.9)	(63.5)
Income taxes	(2.6)	(2.1)
Spire Missouri
Operating Activities:
Net Income	129.0	132.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	88.0	83.0
Deferred income taxes and investment tax credits	16.8	18.8
Changes in assets and liabilities:
Accounts receivable	(5.8)	(17.6)
Inventories	28.8	56.3
Regulatory assets and liabilities	57.9	88.7
Accounts payable	(1.0)	(8.3)
Delayed/advance customer billings, net	(8.7)	(18.5)
Taxes accrued	(5.5)	(3.7)
Other assets and liabilities	(13.3)	(36.9)
Other	0.5	3.9
Net cash provided by operating activities	286.7	298.0
Investing Activities:
Capital expenditures	(253.3)	(255.0)
Other	0.3	1.0
Net cash used in investing activities	(253.0)	(254.0)
Financing Activities:
Issuance of long-term debt	275.0	100.0
Repayment of long-term debt	(107.0)	(50.0)
Repayments to Spire, net	(168.1)	(63.8)
Dividends paid on common stock	(33.9)	(28.5)
Other	(1.6)	0.0
Net cash provided by financing activities	(35.6)	(42.3)
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	(1.9)	1.7
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2.6	2.0
Cash and Cash Equivalents at End of Period	0.7	3.7
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(32.6)	(33.2)
Income taxes	0.0	0.0
Spire Alabama
Operating Activities:
Net Income	74.6	72.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43.9	41.5
Deferred income taxes and investment tax credits	25.2	24.4
Changes in assets and liabilities:
Accounts receivable	2.3	(6.2)
Inventories	15.3	2.9
Regulatory assets and liabilities	6.7	(4.4)
Accounts payable	(19.8)	0.8
Delayed/advance customer billings, net	(7.3)	(6.4)
Taxes accrued	(0.7)	(2.8)
Other assets and liabilities	(8.6)	9.1
Other	0.1	(2.4)
Net cash provided by operating activities	131.7	129.1
Investing Activities:
Capital expenditures	(111.5)	(116.4)
Other	1.4	(2.2)
Net cash used in investing activities	(110.1)	(118.6)
Financing Activities:
Issuance of long-term debt	100.0	90.0
Repayment of long-term debt	(40.0)	0.0
Return of capital to Spire	(20.0)	(20.0)
Repayments to Spire, net	(43.1)	(63.0)
Dividends paid on common stock	(18.0)	(17.0)
Other	(0.5)	(0.5)
Net cash provided by financing activities	(21.6)	(10.5)
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	0.0	0.0
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	0.0	0.0
Cash and Cash Equivalents at End of Period	0.0	0.0
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(14.1)	(12.1)
Income taxes	$ 0.0	$ 0.0