CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Operating Activities:
Net income	$ 214.2	$ 161.6	$ 144.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	168.4	154.1	137.5
Deferred income taxes and investment tax credits	(28.7)	77.0	68.8
Changes in assets and liabilities:
Accounts receivable	(32.7)	(63.0)	(12.3)
Inventories	15.5	(23.5)	16.5
Unamortized purchased gas adjustments	109.0	(50.9)	(52.8)
Accounts payable	12.6	51.1	30.0
Delayed/advance customer billings, net	(12.8)	(40.0)	26.9
Taxes accrued	6.4	5.8	(0.4)
Other assets and liabilities	(39.5)	11.9	(35.0)
Other	44.2	4.2	4.9
Net cash provided by operating activities	456.6	288.3	328.3
Investing Activities:
Capital expenditures	(499.4)	(438.1)	(293.3)
Acquisition of Spire EnergySouth (net of $2.0 cash acquired) and final settlement	0.0	3.8	(317.7)
Other business acquisitions	(28.1)	0.0	0.0
Other	(4.2)	0.8	(1.7)
Net cash used in investing activities	(531.7)	(433.5)	(612.7)
Financing Activities:
Issuance of long-term debt	75.0	420.0	245.0
Repayment of long-term debt	(105.0)	(393.8)	(80.0)
Issuance of short-term debt, net	76.3	78.6	60.7
Issuance of common stock	154.7	146.9	137.1
Dividends paid	(108.7)	(96.2)	(85.2)
Other	(3.2)	(8.1)	(1.8)
Net cash provided by financing activities	89.1	147.4	275.8
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	14.0	2.2	(8.6)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year	7.4	5.2	13.8
Cash, Cash Equivalents, and Restricted Cash at End of Year	21.4	7.4	5.2
Cash, Cash Equivalents at Beginning of Period	7.4
Cash, Cash Equivalents at End of Period	4.4	7.4
Supplemental disclosure of cash (paid) refunded for:
Interest, net of amounts capitalized	(95.1)	(85.5)	(72.5)
Income taxes	(1.5)	(1.3)	2.9
Spire Missouri
Operating Activities:
Net income	129.3	113.0	105.9
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	102.8	93.1	88.6
Deferred income taxes and investment tax credits	(32.6)	47.5	45.3
Changes in assets and liabilities:
Accounts receivable	(2.0)	(20.5)	35.7
Inventories	8.4	(13.0)	11.0
Unamortized purchased gas adjustments	71.0	(11.6)	(18.7)
Accounts payable	(14.8)	16.8	0.9
Delayed/advance customer billings, net	(7.4)	(37.6)	24.9
Taxes accrued	(2.1)	5.0	4.9
Other assets and liabilities	(13.4)	(11.6)	(29.6)
Other	45.0	1.6	2.3
Net cash provided by operating activities	284.2	182.7	271.2
Investing Activities:
Capital expenditures	(295.8)	(282.2)	(197.8)
Other	4.8	1.1	1.1
Net cash used in investing activities	(291.0)	(281.1)	(196.7)
Financing Activities:
Issuance of first mortgage bonds	0.0	170.0	0.0
Issuance of short-term debt, net	(100.0)	(243.7)	10.7
Borrowings from Spire	142.3	203.0	0.0
Dividends paid	(36.0)	(28.7)	(84.8)
Other	0.0	(1.8)	0.0
Net cash provided by financing activities	6.3	98.8	(74.1)
Net (Decrease) Increase in Cash and Cash Equivalents	(0.5)	0.4	0.4
Cash, Cash Equivalents at Beginning of Period	2.5	2.1	1.7
Cash, Cash Equivalents at End of Period	2.0	2.5	2.1
Supplemental disclosure of cash (paid) refunded for:
Interest, net of amounts capitalized	(45.6)	(38.6)	(35.7)
Income taxes	0.0	0.0	2.1
Spire Alabama
Operating Activities:
Net income	1.3	58.1	53.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	53.2	49.9	47.8
Deferred income taxes and investment tax credits	81.6	35.8	33.2
Changes in assets and liabilities:
Accounts receivable	(16.2)	(10.0)	(11.1)
Inventories	(1.2)	0.1	5.3
Unamortized purchased gas adjustments	38.8	(39.6)	(33.8)
Accounts payable	4.7	8.8	9.1
Delayed/advance customer billings, net	(5.5)	(2.5)	2.0
Taxes accrued	4.9	1.8	(5.2)
Other assets and liabilities	(15.1)	(16.6)	(3.2)
Other	(0.4)	(1.3)	0.9
Net cash provided by operating activities	146.1	84.5	98.2
Investing Activities:
Capital expenditures	(131.7)	(113.9)	(93.4)
Other	(1.6)	(0.4)	(2.5)
Net cash used in investing activities	(133.3)	(114.3)	(95.9)
Financing Activities:
Issuance of long-term debt	75.0	0.0	80.0
Repayment of long-term debt	0.0	0.0	(80.0)
Issuance of short-term debt, net	0.0	(82.0)	51.0
(Repayments of) borrowings from Spire	(27.4)	169.9	0.0
Return of capital to Spire	(30.0)	(31.0)	(29.0)
Dividends paid	(30.0)	(27.0)	(31.5)
Other	(0.5)	0.0	0.0
Net cash provided by financing activities	(12.9)	29.9	(9.5)
Net (Decrease) Increase in Cash and Cash Equivalents	(0.1)	0.1	(7.2)
Cash, Cash Equivalents at Beginning of Period	0.1	0.0	7.2
Cash, Cash Equivalents at End of Period	0.0	0.1	0.0
Supplemental disclosure of cash (paid) refunded for:
Interest, net of amounts capitalized	(15.1)	(12.8)	(12.4)
Income taxes	$ 0.0	$ 0.0	$ 0.8