CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities:
Net Income	$ 218.9	$ 240.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	134.9	122.9
Deferred income taxes and investment tax credits	42.6	(9.5)
Changes in assets and liabilities:
Accounts receivable	(44.6)	20.1
Inventories	52.1	72.6
Regulatory assets and liabilities	82.1	156.5
Accounts payable	11.3	(53.0)
Delayed/advance customer billings, net	(23.5)	(51.6)
Taxes accrued	(7.1)	(4.4)
Other assets and liabilities	(24.2)	(26.9)
Other	(1.9)	44.5
Net cash provided by operating activities	440.6	511.3
Investing Activities:
Capital expenditures	(608.5)	(334.3)
Business acquisitions	(7.9)	(28.1)
Other	(7.1)	(8.9)
Net cash used in investing activities	(623.5)	(371.3)
Financing Activities:
Issuance of preferred stock	242.0	0.0
Issuance of long-term debt	190.0	75.0
Repayment of long-term debt	(59.1)	0.0
Repayment of short-term debt, net	(119.6)	(286.3)
Issuance of common stock	5.7	154.2
Dividends paid on common stock	(88.9)	(80.2)
Other	(2.8)	(3.2)
Net cash provided by (used in) financing activities	167.3	(140.5)
Net Decrease in Cash, Cash Equivalents, and Restricted Cash	(15.6)	(0.5)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	21.4	7.4
Cash and Cash Equivalents at End of Period	5.8	6.9
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(63.5)	(60.6)
Income taxes	(2.1)	(0.9)
Cash and Cash Equivalents at Beginning of Period	4.4
Cash and Cash Equivalents at End of Period	5.8	6.9
Spire Missouri
Operating Activities:
Net Income	132.3	139.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	83.0	74.2
Deferred income taxes and investment tax credits	18.8	(23.4)
Changes in assets and liabilities:
Accounts receivable	(17.6)	(8.3)
Inventories	56.3	60.3
Regulatory assets and liabilities	88.7	107.9
Accounts payable	(8.3)	(19.6)
Delayed/advance customer billings, net	(18.5)	(42.7)
Taxes accrued	(3.7)	(7.5)
Other assets and liabilities	(36.9)	(18.9)
Other	3.9	44.1
Net cash provided by operating activities	298.0	305.4
Investing Activities:
Capital expenditures	(255.0)	(203.1)
Other	1.0	0.1
Net cash used in investing activities	(254.0)	(203.0)
Financing Activities:
Issuance of long-term debt	100.0	0.0
Repayment of long-term debt	(50.0)	0.0
Repayments to Spire, net	(63.8)	(74.4)
Dividends paid on common stock	(28.5)	(27.0)
Net cash provided by (used in) financing activities	(42.3)	(101.4)
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(33.2)	(30.7)
Income taxes	0.0	0.0
Net Increase (Decrease) in Cash and Cash Equivalents	1.7	1.0
Cash and Cash Equivalents at Beginning of Period	2.0	2.5
Cash and Cash Equivalents at End of Period	3.7	3.5
Spire Alabama
Operating Activities:
Net Income	72.6	12.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	41.5	39.4
Deferred income taxes and investment tax credits	24.4	85.8
Changes in assets and liabilities:
Accounts receivable	(6.2)	(14.9)
Inventories	2.9	2.2
Regulatory assets and liabilities	(4.4)	44.0
Accounts payable	0.8	(0.1)
Delayed/advance customer billings, net	(6.4)	(9.1)
Taxes accrued	(2.8)	3.4
Other assets and liabilities	9.1	0.5
Other	(2.4)	(0.8)
Net cash provided by operating activities	129.1	162.7
Investing Activities:
Capital expenditures	(116.4)	(83.6)
Other	(2.2)	(1.0)
Net cash used in investing activities	(118.6)	(84.6)
Financing Activities:
Issuance of long-term debt	90.0	75.0
Return of capital to Spire	(20.0)	(30.0)
Repayments to Spire, net	(63.0)	(100.3)
Dividends paid on common stock	(17.0)	(22.5)
Other	(0.5)	(0.4)
Net cash provided by (used in) financing activities	(10.5)	(78.2)
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(12.1)	(10.0)
Income taxes	0.0	0.0
Net Increase (Decrease) in Cash and Cash Equivalents	0.0	(0.1)
Cash and Cash Equivalents at Beginning of Period	0.0	0.1
Cash and Cash Equivalents at End of Period	$ 0.0	$ 0.0