CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Activities:
Net Income	$ 67.3	$ 116.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44.2	40.4
Deferred income taxes and investment tax credits	12.7	(33.6)
Changes in assets and liabilities:
Accounts receivable	(260.5)	(176.7)
Inventories	(2.5)	20.9
Unamortized purchased gas adjustments	20.5	34.6
Accounts payable	158.0	(2.1)
Delayed/advance customer billings, net	(6.9)	(8.7)
Taxes accrued	(19.1)	(25.0)
Other assets and liabilities	57.1	50.3
Other	(0.4)	1.8
Net cash provided by (used in) operating activities	70.4	17.9
Investing Activities:
Capital expenditures	(206.8)	(110.8)
Business acquisitions	(7.9)	(16.0)
Other	(1.5)	0.1
Net cash used in investing activities	(216.2)	(126.7)
Financing Activities:
Issuance of long-term debt	100.0	30.0
Repayment of long-term debt	(9.1)	0.0
Issuance of short-term debt, net	72.5	106.3
Issuance of common stock	0.4	0.3
Dividends paid	(28.8)	(25.8)
Other	(2.2)	(2.7)
Net cash provided by financing activities	132.8	108.1
Net Decrease in Cash, Cash Equivalents, and Restricted Cash	(13.0)	(0.7)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	21.4	7.4
Cash and Cash Equivalents at End of Period	8.4	6.7
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(13.9)	(13.3)
Income taxes	0.0	0.0
Cash and Cash Equivalents at Beginning of Period	4.4
Cash and Cash Equivalents at End of Period	8.4	6.7
Spire Missouri
Operating Activities:
Net Income	51.2	89.4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	27.2	24.8
Deferred income taxes and investment tax credits	7.4	(25.0)
Changes in assets and liabilities:
Accounts receivable	(124.6)	(143.0)
Inventories	(2.5)	9.9
Unamortized purchased gas adjustments	16.9	28.8
Accounts payable	50.9	1.6
Delayed/advance customer billings, net	(4.4)	(6.9)
Taxes accrued	(17.4)	(21.7)
Other assets and liabilities	44.5	40.7
Other	1.2	1.1
Net cash provided by (used in) operating activities	50.4	(0.3)
Investing Activities:
Capital expenditures	(92.0)	(70.5)
Other	0.6	(0.2)
Net cash used in investing activities	(91.4)	(70.7)
Financing Activities:
Issuance of long-term debt	100.0	0.0
(Repayments to) borrowings from Spire – net	(37.3)	72.6
Dividends paid	(18.8)	0.0
Net cash provided by financing activities	43.9	72.6
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(8.3)	(7.6)
Income taxes	0.0	0.0
Net Increase (Decrease) in Cash and Cash Equivalents	2.9	1.6
Cash and Cash Equivalents at Beginning of Period	2.0	2.5
Cash and Cash Equivalents at End of Period	4.9	4.1
Spire Alabama
Operating Activities:
Net Income	10.3	(49.6)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13.6	12.8
Deferred income taxes and investment tax credits	3.5	65.0
Changes in assets and liabilities:
Accounts receivable	(52.0)	(44.3)
Inventories	3.2	7.7
Unamortized purchased gas adjustments	4.8	5.8
Accounts payable	29.7	14.9
Delayed/advance customer billings, net	(3.2)	(1.8)
Taxes accrued	(1.7)	(1.4)
Other assets and liabilities	9.5	0.0
Other	(0.4)	0.0
Net cash provided by (used in) operating activities	17.3	9.1
Investing Activities:
Capital expenditures	(30.1)	(24.9)
Other	(0.4)	0.0
Net cash used in investing activities	(30.5)	(24.9)
Financing Activities:
Issuance of long-term debt	0.0	30.0
(Repayments to) borrowings from Spire – net	21.7	(6.8)
Dividends paid	(8.5)	(7.5)
Net cash provided by financing activities	13.2	15.7
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(3.6)	(3.4)
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