Spire Missouri 10-Q 3 May 23 2023 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Mar. 31, 2023	Apr. 30, 2023
Document Information [Line Items]
Entity Central Index Key	0001126956
Entity Registrant Name	Spire Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2023
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	1-16681
Entity Address, Address Line One	700 Market Street
Entity Address, City or Town	St. Louis
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63101
City Area Code	314
Local Phone Number	342-0500
Entity Incorporation, State or Country Code	MO
Entity Tax Identification Number	74-2976504
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		52,597,027
Spire Missouri [Member]
Document Information [Line Items]
Entity Central Index Key	0000057183
Entity Registrant Name	Spire Missouri Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2023
Entity File Number	1-1822
Entity Address, Address Line One	700 Market Street
Entity Address, City or Town	St. Louis
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63101
City Area Code	314
Local Phone Number	342-0500
Entity Incorporation, State or Country Code	MO
Entity Tax Identification Number	43-0368139
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		25,325
Spire Alabama Inc [Member]
Document Information [Line Items]
Entity Central Index Key	0000003146
Entity Registrant Name	Spire Alabama Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2023
Entity File Number	2-38960
Entity Address, Address Line One	605 Richard Arrington Blvd N
Entity Address, City or Town	Birmingham
Entity Address, State or Province	AL
Entity Address, Postal Zip Code	35203
City Area Code	205
Local Phone Number	326-8100
Entity Incorporation, State or Country Code	AL
Entity Tax Identification Number	63-0022000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,972,052
Depositary Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares
Trading Symbol	SR.PRA
Security Exchange Name	NYSE
Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock $1.00 par value
Trading Symbol	SR
Security Exchange Name	NYSE

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Operating Revenues	$ 1,123.4	$ 880.9	$ 1,937.4	$ 1,436.3
Operating Expenses:
Natural gas	586.5	392	1,005.7	641.2
Operation and maintenance	132.1	113.2	264.2	229.6
Depreciation and amortization	62.6	58.9	124.7	115.8
Taxes, other than income taxes	81.9	71.6	132.3	109.2
Total Operating Expenses	863.1	635.7	1,526.9	1,095.8
Operating Income	260.3	245.2	410.5	340.5
Interest Expense, Net	47.2	27.5	90.8	56.1
Other Income (Expense), Net	7	(3.4)	13	4
Income Before Income Taxes	220.1	214.3	332.7	288.4
Income Tax Expense	40.9	40.7	62.5	59.1
Net Income	179.2	173.6	270.2	229.3
Provision for preferred dividends	3.7	3.7	7.4	7.4
Income allocated to participating securities	0.4	0.2	0.5	0.3
Net Income Available to Common Shareholders	$ 175.1	$ 169.7	$ 262.3	$ 221.6
Weighted Average Number of Common Shares Outstanding:
Basic (in shares)	52.5	51.8	52.5	51.7
Diluted (in shares)	52.6	51.9	52.6	51.8
Basic Earnings Per Common Share (in dollars per share)	$ 3.33	$ 3.27	$ 5	$ 4.28
Diluted Earnings Per Common Share (in dollars per share)	$ 3.33	$ 3.27	$ 4.99	$ 4.28
Operating Revenues	$ 1,123.4	$ 880.9	$ 1,937.4	$ 1,436.3
Spire Alabama Inc [Member]
Operating Revenues	218.3	204.1	370.7	330.7
Operating Expenses:
Natural gas	61.8	52.1	131.2	97.6
Operation and maintenance	34.5	32.9	69.6	67.4
Depreciation and amortization	17	16.7	34	33.2
Taxes, other than income taxes	16.1	14.5	26.7	23.5
Total Operating Expenses	129.4	116.2	261.5	221.7
Operating Income	88.9	87.9	109.2	109
Interest Expense, Net	9	4.7	17.3	9.8
Other Income (Expense), Net	0.3	0.1	0.7	0.5
Income Before Income Taxes	80.2	83.3	92.6	99.7
Income Tax Expense	20.2	20.9	23.4	25.1
Net Income	60	62.4	69.2	74.6
Weighted Average Number of Common Shares Outstanding:
Operating Revenues	$ 218.3	$ 204.1	$ 370.7	$ 330.7

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2023		Mar. 31, 2022	Mar. 31, 2023		Mar. 31, 2022
Net Income	$ 179.2		$ 173.6	$ 270.2		$ 229.3
Other Comprehensive (Loss) Income, Before Tax:
Net hedging (loss) gain arising during the period	(6.8)		18.7	(9.8)		13.9
Amounts reclassified into regulatory liabilities	(17.5)		0	(17.5)		0
Amounts reclassified into net income	(0.5)		(0.4)	(0.8)		(0.7)
Net (loss) gain on cash flow hedging derivative instruments	(24.8)		18.3	(28.1)		13.2
Net gain on defined benefit pension and other postretirement plans	0.1		0.1	0.2		0.2
Net unrealized loss on available for sale securities	0		(0.1)	0		(0.2)
Other Comprehensive (Loss) Income, Before Tax	(24.7)		18.3	(27.9)		13.2
Income Tax (Benefit) Expense Related to Items of Other Comprehensive Income or Loss	(5.8)		4.3	(6.6)		3.1
Other Comprehensive (Loss) Income, Net of Tax	(18.9)		14	(21.3)		10.1
Comprehensive Income	160.3		187.6	248.9		239.4
Operating Revenues	1,123.4		880.9	1,937.4		1,436.3
Operating Expenses:
Natural gas	586.5		392	1,005.7		641.2
Operation and maintenance	132.1		113.2	264.2		229.6
Depreciation and amortization	62.6		58.9	124.7		115.8
Taxes, other than income taxes	81.9		71.6	132.3		109.2
Total Operating Expenses	863.1		635.7	1,526.9		1,095.8
Operating Income	260.3		245.2	410.5		340.5
Interest Expense, Net	47.2		27.5	90.8		56.1
Other Income (Expense), Net	7		(3.4)	13		4
Income Before Income Taxes	220.1		214.3	332.7		288.4
Income Tax Expense	40.9		40.7	62.5		59.1
Net Income	179.2		173.6	270.2		229.3
Other Comprehensive Income, Net of Tax	(18.9)		14	(21.3)		10.1
Comprehensive Income	160.3		187.6	248.9		239.4
Spire Missouri [Member]
Net Income	112.1	[1]	98.2	159.4	[1]	143.5
Other Comprehensive (Loss) Income, Before Tax:
Other Comprehensive (Loss) Income, Net of Tax	0.1	[1]	0.1	0.2	[1]	0.2
Comprehensive Income	112.2		98.3	159.6		143.7
Operating Revenues	791		571.2	1,332.2		919.1
Operating Expenses:
Natural gas	465.7		287.8	782.4		444.1
Operation and maintenance	77.4		64.3	154.5		130.6
Depreciation and amortization	39.2		35.9	77.8		70.1
Taxes, other than income taxes	61.2		53	97.6		78.7
Total Operating Expenses	643.5		441	1,112.3		723.5
Operating Income	147.5		130.2	219.9		195.6
Interest Expense, Net	24.6		14.2	46.6		28.7
Other Income (Expense), Net	5.9		(2.4)	10.9		3.5
Income Before Income Taxes	128.8		113.6	184.2		170.4
Income Tax Expense	16.7		15.4	24.8		26.9
Net Income	112.1	[1]	98.2	159.4	[1]	143.5
Other Comprehensive Income, Net of Tax	0.1	[1]	0.1	0.2	[1]	0.2
Comprehensive Income	$ 112.2		$ 98.3	$ 159.6		$ 143.7
[1]Accumulated other comprehensive income (loss)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Millions	Mar. 31, 2023		Sep. 30, 2022		Mar. 31, 2022
ASSETS
Utility Plant	$ 7,892.4		$ 7,664.9		$ 7,443.7
Less: Accumulated depreciation and amortization	2,358.5		2,294.5		2,241.9
Net Utility Plant	5,533.9		5,370.4		5,201.8
Non-utility Property (net of accumulated depreciation and amortization of $60.6, $50.7 and $41.3 at March 31, 2023, September 30, 2022, and March 31, 2022, respectively)	520.4		491.4		475.8
Other Investments	131.3		87.8		89
Total Other Property and Investments	651.7		579.2		564.8
Other Property and Investments	651.7		579.2		564.8
Current Assets:
Cash and cash equivalents	6.9		6.5		8.3
Utility	453.7		210.8		389.2
Other	166		443.8		245.4
Allowance for credit losses	(40.6)		(31.9)		(35.1)
Delayed customer billings	85.6		21.3		54.7
Accounts receivable:
Utility	453.7		210.8		389.2
Other	166		443.8		245.4
Allowance for credit losses	(40.6)		(31.9)		(35.1)
Delayed customer billings	85.6		21.3		54.7
Inventories:
Natural gas	146.8		371.8		125
Propane gas	8.6		8.6		8.6
Materials and supplies	48.9		41.9		34.7
Regulatory assets	143		355.4		164
Prepayments	32.5		41.1		26.6
Other current assets	60.2		122.7		67.9
Total Current Assets	1,111.6		1,592		1,089.3
Deferred Charges and Other Assets:
Goodwill	1,171.6		1,171.6		1,171.6
Regulatory assets	1,316.7		1,112.4		1,106.8
Other	263.5		258.1		267
Total Deferred Charges and Other Assets	2,751.8		2,542.1		2,545.4
Total Assets	10,049		10,083.7		9,401.3
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at March 31, 2023, September 30, 2022, and March 31, 2022)	242		242		242
Common stock (par value $1.00 per share; 70.0 million shares authorized; 52.6 million, 52.5 million, and 52.1 million shares issued and outstanding at March 31, 2023, September 30, 2022, and March 31, 2022, respectively)	52.6		52.5		52.1
Paid-in capital	1,576.5		1,571.3		1,541.1
Retained earnings	1,089.5		905.5		992.3
Accumulated other comprehensive income	25.9		47.2		13.7
Total Shareholders' Equity	2,986.5		2,818.5		2,841.2
Temporary equity	18.8		13.1		11.8
Long-term debt (less current portion)	3,702.5		2,958.5		3,207.3
Total Capitalization	6,707.8		5,790.1		6,060.3
Current Liabilities:
Current portion of long-term debt	256.6		281.2		31.2
Notes payable	561		1,037.5		607.1
Accounts payable	232.3		617.4		367.5
Advance customer billings	6.8		18.7		6.3
Wages and compensation accrued	38.6		50.2		39.3
Customer deposits	28.3		28.2		29.4
Taxes accrued	79.9		90.1		67.4
Regulatory liabilities	5.3		3.7		3.2
Other current liabilities	198.1		226.6		244.4
Total Current Liabilities	1,406.9		2,353.6		1,395.8
Deferred Credits and Other Liabilities:
Deferred income taxes	737.9		675.1		666.5
Pension and postretirement benefit costs	158.6		163		199.2
Asset retirement obligations	531.5		520.9		530.1
Regulatory liabilities	360.3		418.2		400.4
Other noncurrent liabilities	146		162.8		149
Total Deferred Credits and Other Liabilities	1,934.3		1,940		1,945.2
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	10,049		10,083.7		9,401.3
Spire Missouri [Member]
ASSETS
Utility Plant	4,731.2		4,550.4		4,416.9
Less: Accumulated depreciation and amortization	1,027.1		982.1		949.2
Net Utility Plant	3,704.1		3,568.3		3,467.7
Total Other Property and Investments	66.7		58.9		66.9
Other Property and Investments	66.7		58.9		66.9
Current Assets:
Utility	362		131.5		288.6
Other	32.5		44.5		35.3
Allowance for credit losses	(34.5)		(24.9)		(27)
Delayed customer billings	84.5		16.1		53.5
Accounts receivable:
Utility	362		131.5		288.6
Other	32.5		44.5		35.3
Allowance for credit losses	(34.5)		(24.9)		(27)
Delayed customer billings	84.5		16.1		53.5
Inventories:
Natural gas	86.7		215.3		80.9
Propane gas	8.6		8.6		8.6
Materials and supplies	24.4		22		18.6
Regulatory assets	62.7		288.1		112.7
Prepayments	18.5		23.3		16
Total Current Assets	649.2		728.2		590.8
Deferred Charges and Other Assets:
Goodwill	210.2		210.2		210.2
Regulatory assets	722		547.6		572.7
Other	107.2		105		126.4
Total Deferred Charges and Other Assets	1,039.4		862.8		909.3
Total Assets	5,459.4		5,218.2		5,034.7
Capitalization:
Retained earnings	1,061.3		931.9		960.5
Accumulated other comprehensive income	(2.5)		(2.7)		(4)
Total Shareholders' Equity	1,875	[1]	1,745.4	[1]	1,744.9
Long-term debt (less current portion)	1,784.5		1,387.7		1,637.1
Total Capitalization	3,659.5		3,133.1		3,382
Paid-in capital and common stock (par value $1.00 per share; 50.0 million shares authorized; 25,325, 25,325, and 24,929 shares issued and outstanding at March 31, 2023, September 30, 2022, and March 31, 2022, respectively)	816.2		816.2		788.4
Current Liabilities:
Current portion of long-term debt	250		250		0
Advance customer billings	0		7		0
Wages and compensation accrued	20.4		33.8		27.1
Customer deposits	6		6.5		7.7
Taxes accrued	47.2		50.4		37.4
Other current liabilities	52.5		45.6		49.4
Total Current Liabilities	726.9		970.9		502.6
Deferred Credits and Other Liabilities:
Deferred income taxes	533.3		500.1		498.9
Pension and postretirement benefit costs	99.8		115.5		132.9
Asset retirement obligations	112.8		110.6		146.3
Regulatory liabilities	276.9		331.8		313.7
Other noncurrent liabilities	50.2		56.2		58.3
Total Deferred Credits and Other Liabilities	1,073		1,114.2		1,150.1
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	5,459.4		5,218.2		5,034.7
Spire Missouri [Member] | Related Party [Member]
Current Assets:
Associated companies	3.8		3.7		3.6
Accounts receivable:
Associated companies	3.8		3.7		3.6
Current Liabilities:
Notes payable	60.7		445.3		277.2
Accounts payable	11.3		13.3		6.9
Spire Missouri [Member] | Nonrelated Party [Member]
Current Liabilities:
Notes payable	200		0		0
Accounts payable	78.8		119		96.9
Spire Alabama Inc [Member]
ASSETS
Utility Plant	2,781.4		2,732.6		2,643.9
Less: Accumulated depreciation and amortization	1,208.7		1,184.1		1,154
Net Utility Plant	1,572.7		1,548.5		1,489.9
Current Assets:
Cash and cash equivalents	1		2.4		0.2
Utility	75.4		69.9		86
Other	5.3		6.5		5.6
Allowance for credit losses	(5.3)		(6.3)		(7.1)
Delayed customer billings	1		4.8		1.2
Accounts receivable:
Utility	75.4		69.9		86
Other	5.3		6.5		5.6
Allowance for credit losses	(5.3)		(6.3)		(7.1)
Delayed customer billings	1		4.8		1.2
Inventories:
Natural gas	41.4		72.5		32
Materials and supplies	20.5		16.3		13.1
Regulatory assets	64.8		56.9		41
Prepayments	3.8		5.8		3.6
Total Current Assets	208.7		230.1		176.3
Deferred Charges and Other Assets:
Regulatory assets	568.3		538.2		506.7
Other	81.9		81.3		63.6
Total Deferred Charges and Other Assets	650.2		630.5		579.4
Total Assets	2,431.6		2,409.1		2,245.6
Deferred income taxes	0		11		9.1
Capitalization:
Retained earnings	645.3		589.1		611.2
Total Shareholders' Equity	935.2		906		934.1
Long-term debt (less current portion)	745.7		571.5		571.4
Total Capitalization	1,680.9		1,477.5		1,505.5
Paid-in capital and common stock (par value $1.00 per share; 50.0 million shares authorized; 25,325, 25,325, and 24,929 shares issued and outstanding at March 31, 2023, September 30, 2022, and March 31, 2022, respectively)	289.9		316.9		322.9
Current Liabilities:
Accounts payable	29.8		85.6		50.8
Advance customer billings	5.3		9.9		5.2
Wages and compensation accrued	5.4		7.6		5.6
Customer deposits	19.6		19		19
Taxes accrued	26.4		31.3		24.3
Other current liabilities	15.7		22.4		12.3
Total Current Liabilities	230.5		441.1		280
Deferred Credits and Other Liabilities:
Deferred income taxes	12.3		0		0
Pension and postretirement benefit costs	52.8		40.5		59.1
Asset retirement obligations	406.9		398.7		370
Regulatory liabilities	21.5		23		24.7
Other noncurrent liabilities	26.7		28.3		6.3
Total Deferred Credits and Other Liabilities	520.2		490.5		460.1
Total Capitalization and Liabilities	2,431.6		2,409.1		2,245.6
Spire Alabama Inc [Member] | Related Party [Member]
Current Assets:
Associated companies	0.8		1.3		0.7
Accounts receivable:
Associated companies	0.8		1.3		0.7
Current Liabilities:
Notes payable	121.3		260.9		156.6
Accounts payable	$ 7		$ 4.4		$ 6.2
[1]Accumulated other comprehensive income (loss)

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022
Non-utility property, accumulated depreciation and amortization	$ 60.6	$ 50.7	$ 41.3
Preferred stock, par value (in dollars per share)	$ 25	$ 25	$ 25
Common stock, par value (in dollars per share)	$ 1	$ 1	$ 1
Common stock, shares authorized (in shares)	70,000,000	70,000,000	70,000,000
Common stock, shares issued (in shares)	52,600,000	52,500,000	52,100,000
Common Stock, shares outstanding (in shares)	52,600,000	52,500,000	52,100,000
Depositary Shares [Member]
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	10,000,000	10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	10,000,000	10,000,000	10,000,000
Spire Missouri [Member]
Common stock, par value (in dollars per share)	$ 1	$ 1	$ 1
Common stock, shares authorized (in shares)	50,000,000	50,000,000	50,000,000
Common stock, shares issued (in shares)	25,325	25,325	24,929
Common Stock, shares outstanding (in shares)	25,325	25,325	24,929
Spire Alabama Inc [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	3	3	3
Common stock, shares issued (in shares)	2	2	2
Common Stock, shares outstanding (in shares)	2	2	2

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Spire Missouri [Member] Common Stock [Member]	Spire Missouri [Member] Additional Paid-in Capital [Member]	Spire Missouri [Member] Retained Earnings [Member]	Spire Missouri [Member] AOCI Attributable to Parent [Member]	Spire Missouri [Member]		Spire Alabama Inc [Member] Common Stock [Member]	Spire Alabama Inc [Member] Additional Paid-in Capital [Member]	Spire Alabama Inc [Member] Retained Earnings [Member]	Spire Alabama Inc [Member]	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]		Total
Balance (in shares) at Sep. 30, 2021	24,577						1,972,052				51,684,883
Balance at Sep. 30, 2021	$ 0.1	$ 765	$ 817	$ (4.2)	$ 1,577.9		$ 0	$ 328.9	$ 552.6	$ 881.5	$ 51.7	$ 242	$ 1,517.9	$ 843	$ 3.6		$ 2,658.2
Net Income	$ 0	0	143.5	0	143.5		0	0	74.6	74.6	$ 0	0	0	229.3	0		229.3
Common stock issued (in shares)	352										354,000
Stock issued	$ 0	23.3	0	0	23.3						$ 0.3	0	22.8	0	0		23.1
Dividend reinvestment plan (in shares)											13,269
Dividend reinvestment plan											$ 0	0	0.8	0	0		0.8
Stock-based compensation costs											$ 0	0	1.4	0	0		1.4
Stock issued under stock-based compensation plans (in shares)											91,428
Stock issued under stock-based compensation plans											$ 0.1	0	0.1	0	0		0
Employees’ tax withholding for stock-based compensation (in shares)											(26,913)
Employees’ tax withholding for stock-based compensation											$ 0	0	(1.7)	0	0		(1.7)
Temporary equity adjustment to redemption value											0	0	0	(1.2)	0		(1.2)
Common stock, dividends							$ 0	0	(16)	(16)	0	0	0	(71.4)	0		(71.4)
Preferred stock dividends											0	0	0	(7.4)	0		(7.4)
Other Comprehensive Income, Net of Tax	$ 0	0	0	0.2	0.2						0	0	0	0	10.1		10.1
Stock issued under stock-based compensation plans											$ (0.1)	0	(0.1)	0	0		0
Balance (in shares) at Mar. 31, 2022	24,929						1,972,052				52,116,667
Balance at Mar. 31, 2022	$ 0.1	788.3	960.5	(4)	1,744.9		$ 0	322.9	611.2	934.1	$ 52.1	242	1,541.1	992.3	13.7	[1]	2,841.2
Return of capital to Spire							$ 0	(6)	0	(6)
Balance (in shares) at Dec. 31, 2021	24,577						1,972,052				51,742,481
Balance at Dec. 31, 2021	$ 0.1	765	862.3	(4.1)	1,623.3		$ 0	322.9	556.8	879.7	$ 51.7	242	1,516.9	859.5	(0.3)	[1]	2,669.8
Net Income	$ 0	0	98.2	0	98.2		0	0	62.4	62.4	$ 0	0	0	173.6	0	[1]	173.6
Common stock issued (in shares)	352										354,000
Stock issued	$ 0	23.3	0	0	23.3						$ 0.3	0	22.8	0	0		23.1
Dividend reinvestment plan (in shares)											7,036
Dividend reinvestment plan											$ 0	0	0.4	0	0	[1]	0.4
Stock-based compensation costs											$ 0	0	1.1	0	0	[1]	1.1
Stock issued under stock-based compensation plans (in shares)											13,452
Stock issued under stock-based compensation plans											$ 0.1	0	(0.1)	0	0	[1]	0
Employees’ tax withholding for stock-based compensation (in shares)											(302)
Employees’ tax withholding for stock-based compensation											$ 0	0	0	0	0	[1]	0
Temporary equity adjustment to redemption value											0	0	0	(1.3)	0	[1]	(1.3)
Common stock, dividends							$ 0	0	(8)	(8)	0	0	0	(35.8)	0	[1]	(35.8)
Preferred stock dividends											0	0	0	(3.7)	0	[1]	(3.7)
Other Comprehensive Income, Net of Tax	$ 0	0	0	0.1	0.1						0	0	0	0	14		14
Stock issued under stock-based compensation plans											$ (0.1)	0	0.1	0	0	[1]	0
Balance (in shares) at Mar. 31, 2022	24,929						1,972,052				52,116,667
Balance at Mar. 31, 2022	$ 0.1	788.3	960.5	(4)	1,744.9		$ 0	322.9	611.2	934.1	$ 52.1	242	1,541.1	992.3	13.7	[1]	2,841.2
Other Comprehensive Income, Net of Tax											$ 0	0	0	0	(21.3)		(21.3)
Balance (in shares) at Mar. 31, 2023	25,325						1,972,052				52,593,433
Balance at Mar. 31, 2023	$ 0.1	816.1	1,061.3	(2.5)	1,875	[1]	$ 0	289.9	645.3	935.2	$ 52.6	242	1,576.5	1,089.5	25.9	[1]	2,986.5
Balance (in shares) at Sep. 30, 2022	25,325						1,972,052				52,494,543
Balance at Sep. 30, 2022	$ 0.1	816.1	931.9	(2.7)	1,745.4	[1]	$ 0	316.9	589.1	906	$ 52.5	242	1,571.3	905.5	47.2		2,818.5
Net Income	0	0	159.4	0	159.4	[1]	0	0	69.2	69.2	$ 0	0	0	270.2	0		270.2
Common stock issued (in shares)											40,500
Stock issued											$ 0.1	0	2.9	0	0		3
Dividend reinvestment plan (in shares)											11,121
Dividend reinvestment plan											$ 0	0	0.7	0	0		0.7
Stock-based compensation costs											$ 0	0	2.9	0	0		2.9
Stock issued under stock-based compensation plans (in shares)											64,686
Stock issued under stock-based compensation plans											$ 0	0	0	0	0		0
Employees’ tax withholding for stock-based compensation (in shares)											(17,417)
Employees’ tax withholding for stock-based compensation											$ 0	0	(1.3)	0	0		(1.3)
Temporary equity adjustment to redemption value											0	0	0	(3)	0		(3)
Common stock, dividends	0	0	(30)	0	(30)		$ 0	0	(13)	(13)	0	0	0	(75.8)	0		(75.8)
Preferred stock dividends											0	0	0	(7.4)	0		(7.4)
Other Comprehensive Income, Net of Tax	$ 0	0	0	0.2	0.2	[1]											(21.3)
Stock issued under stock-based compensation plans											$ 0	0	0	0	0		0
Balance (in shares) at Mar. 31, 2023	25,325						1,972,052				52,593,433
Balance at Mar. 31, 2023	$ 0.1	816.1	1,061.3	(2.5)	1,875	[1]	$ 0	289.9	645.3	935.2	$ 52.6	242	1,576.5	1,089.5	25.9	[1]	2,986.5
Return of capital to Spire							$ 0	(27)	0	(27)
Balance (in shares) at Dec. 31, 2022	25,325						1,972,052				52,541,696
Balance at Dec. 31, 2022	$ 0.1	816.1	979.2	(2.6)	1,792.8	[1]	$ 0	305.4	595.3	900.7	$ 52.5	242	1,571.8	953	44.8	[1]	2,864.1
Net Income	0	0	112.1	0	112.1	[1]	0	0	60	60	$ 0		0	179.2	0	[1]	179.2
Common stock issued (in shares)											40,500,000,000
Stock issued											$ 0.1	0	2.9	0	0		3
Dividend reinvestment plan (in shares)											5,421
Dividend reinvestment plan											$ 0	0	0.3	0	0	[1]	0.3
Stock-based compensation costs											$ 0		1.5	0	0	[1]	1.5
Stock issued under stock-based compensation plans (in shares)											6,008
Stock issued under stock-based compensation plans											$ 0	0	0	0	0	[1]	0
Employees’ tax withholding for stock-based compensation (in shares)											(192)
Employees’ tax withholding for stock-based compensation											$ 0	0	0	0	0	[1]	0
Temporary equity adjustment to redemption value											0		0	(1.3)	0	[1]	(1.3)
Common stock, dividends	0	0	(30)	0	(30)		$ 0	0	(10)	(10)	0		0	(37.7)	0	[1]	(37.7)
Preferred stock dividends											0		0	(3.7)	0	[1]	(3.7)
Other Comprehensive Income, Net of Tax	$ 0	0	0	0.1	0.1	[1]					0		0	0	(18.9)		(18.9)
Stock issued under stock-based compensation plans											$ 0	0	0	0	0	[1]	0
Balance (in shares) at Mar. 31, 2023	25,325						1,972,052				52,593,433
Balance at Mar. 31, 2023	$ 0.1	$ 816.1	$ 1,061.3	$ (2.5)	$ 1,875	[1]	$ 0	289.9	645.3	935.2	$ 52.6	$ 242	$ 1,576.5	$ 1,089.5	$ 25.9	[1]	$ 2,986.5
Return of capital to Spire							$ 0	$ (15.5)	$ 0	$ (15.5)
[1]Accumulated other comprehensive income (loss)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2023
Common stock, dividends per share declared (in dollars per share)	$ 0.72	$ 1.44
Preferred stock dividends per share declared (in dollars per share)	$ 0.36875	$ 0.7375

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2023		Mar. 31, 2022
Operating Activities:
Net Income	$ 270.2		$ 229.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	124.7		115.8
Deferred income taxes and investment tax credits	62.5		59.1
Changes in assets and liabilities:
Accounts receivable	43.7		(3.4)
Inventories	218.2		136.9
Regulatory assets and liabilities	(35.5)		(230.5)
Accounts payable	(372.9)		(21.1)
Delayed/advance customer billings, net	(76.3)		(71.4)
Taxes accrued	(10.8)		(11.2)
Other assets and liabilities	(50.6)		(51.4)
Other	6.7		3
Net cash provided by operating activities	179.9		155.1
Delayed/advance customer billings, net	(76.3)		(71.4)
Investing Activities:
Capital expenditures	(307.8)		(275.9)
Advance payment for business acquisition	(37.1)		0
Other	4.2		2.7
Net cash used in investing activities	(340.7)		(273.2)
Financing Activities:
Issuance of long-term debt	755		300
Repayment of long-term debt	(31.2)		(55.8)
Repayment of short-term debt, net	(476.5)		(64.9)
Issuance of common stock	3.6		24
Dividends paid on common stock	(74.5)		(70.1)
Dividends paid on preferred stock	(7.4)		(7.4)
Other financing activities	(7.5)		(3.8)
Net cash provided by financing activities	161.5		122
Net Increase in Cash, Cash Equivalents, and Restricted Cash	0.7		3.9
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	20.5		11.3
Cash, Cash Equivalents, and Restricted Cash at End of Period	21.2		15.2
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(80.5)		(56.5)
Income taxes	(1.4)		(0.2)
Spire Missouri [Member]
Operating Activities:
Net Income	159.4	[1]	143.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	77.8		70.1
Deferred income taxes and investment tax credits	24.8		26.9
Changes in assets and liabilities:
Accounts receivable	(208.9)		18.2
Inventories	126.2		92.4
Regulatory assets and liabilities	0.6		(181.3)
Accounts payable	(31.5)		12.9
Delayed/advance customer billings, net	(75.4)		(70.8)
Taxes accrued	(3.2)		(3.8)
Other assets and liabilities	(47.4)		(41.7)
Other	0.8		0.7
Net cash provided by operating activities	23.2		67.1
Delayed/advance customer billings, net	(75.4)		(70.8)
Investing Activities:
Capital expenditures	(206.6)		(176)
Other	1.8		1.4
Net cash used in investing activities	(204.8)		(174.6)
Financing Activities:
Issuance of long-term debt	400		300
Issuance of common stock	0		23.3
Dividends paid on common stock	(30)		0
Other financing activities	(3.9)		(2)
Net cash provided by financing activities	181.6		107.5
Net Increase in Cash, Cash Equivalents, and Restricted Cash	0		0
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	0		0
Cash, Cash Equivalents, and Restricted Cash at End of Period	0		0
Issuance (repayment) of short-term debt, net	200		(250)
Borrowings from (repayments to) Spire, net	(384.5)		36.2
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(44.1)		(28.3)
Income taxes	0		0
Spire Alabama Inc [Member]
Operating Activities:
Net Income	69.2		74.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	34		33.2
Deferred income taxes and investment tax credits	23.4		25.1
Changes in assets and liabilities:
Accounts receivable	(4.8)		(34.9)
Inventories	26.9		1.3
Regulatory assets and liabilities	(32.3)		(50.7)
Accounts payable	(39.2)		7.4
Delayed/advance customer billings, net	(0.7)		(0.6)
Taxes accrued	(4.9)		(6.1)
Other assets and liabilities	12.6		(14.2)
Other	0.2		(0.1)
Net cash provided by operating activities	84.4		35
Delayed/advance customer billings, net	(0.7)		(0.6)
Investing Activities:
Capital expenditures	(72.9)		(71)
Other	0.7		0.6
Net cash used in investing activities	(72.2)		(70.4)
Financing Activities:
Issuance of long-term debt	175		0
Repayment of long-term debt	0		(50)
Dividends paid on common stock	(21)		(16)
Other financing activities	(1)		0
Net cash provided by financing activities	(13.6)		35.6
Net Increase in Cash, Cash Equivalents, and Restricted Cash	(1.4)		0.2
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2.4		0
Cash, Cash Equivalents, and Restricted Cash at End of Period	1		0.2
Borrowings from (repayments to) Spire, net	(139.6)		107.6
Return of capital to Spire	(27)		(6)
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(12.6)		(10.1)
Income taxes	$ 0		$ 0
[1]Accumulated other comprehensive income (loss)

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Significant Accounting Policies [Text Block]	1. BASIS OF PRESENTATION The accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information with the instructions to Form 10 10 01 not 10 10 September 30, 2022 The consolidated financial position, results of operations, and cash flows of Spire include the accounts of the Company and all its subsidiaries. Transactions and balances between consolidated entities have been eliminated from the consolidated financial statements of Spire. In compliance with GAAP, transactions between Spire Missouri and Spire Alabama and their affiliates, as well as intercompany balances on their balance sheets, have not Certain information is presented by reportable segment, as described below. Effective during the first 2023, NATURE OF OPERATIONS three Note 10 The Company’s earnings are derived primarily from its Gas Utility segment. Due to the seasonal nature of the Utilities’ business and the volumetric Spire Missouri rate design, earnings are typically concentrated during the heating season of November April not REGULATED OPERATIONS 980, Regulated Operations third may As authorized by the Missouri Public Service Commission (MoPSC), the Mississippi Public Service Commission (MSPSC) and the Alabama Public Service Commission (APSC), the Purchased Gas Adjustment (PGA) clauses and Gas Supply Adjustment (GSA) riders allow the Utilities to pass through to customers the cost of purchased gas supplies. Regulatory assets and liabilities related to the PGA clauses and the GSA riders are both labeled Unamortized Purchased Gas Adjustments herein. See additional information about regulatory assets and liabilities in Note 5 DERIVATIVES 815, Derivatives and Hedging not TRANSACTIONS WITH AFFILIATES Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire Missouri Purchases of natural gas from Spire Marketing $ 13.8 $ 17.9 $ 42.3 $ 36.1 Transportation services received from Spire STL Pipeline 7.8 7.8 15.9 15.9 Sales of natural gas to Spire Marketing 0.1 — 0.1 — Spire Alabama Purchases of natural gas from Spire Marketing $ — $ — $ 1.1 $ — RESTRICTED CASH AND OTHER INVESTMENTS March 31, 2023 March 31, 2023 September 30, 2022 March 31, 2022, A subsidiary of Spire Storage, in the Midstream segment, acquired a natural gas storage facility in northern Oklahoma formerly known as Salt Plains Storage on April 1, 2023. third June 30, 2023, March 31, 2023, ACCRUED CAPITAL EXPENDITURES March 31, September 30, March 31, 2023 2022 2022 Spire $ 66.3 $ 77.8 $ 38.8 Spire Missouri 35.4 45.6 28.7 Spire Alabama 5.2 19.2 5.0 ACCOUNTS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES not Spire Spire Missouri Spire Alabama Three Months Ended March 31, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 34.5 $ 31.4 $ 28.2 $ 23.8 $ 5.5 $ 6.7 Provision for expected credit losses 8.2 5.2 7.3 4.7 0.5 0.5 Write-offs, net of recoveries (2.1 ) (1.5 ) (1.0 ) (1.5 ) (0.7 ) (0.1 ) Allowance at end of period $ 40.6 $ 35.1 $ 34.5 $ 27.0 $ 5.3 $ 7.1 Six Months Ended March 31, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 31.9 $ 30.3 $ 24.9 $ 22.6 $ 6.3 $ 6.6 Provision for expected credit losses 12.3 6.7 11.1 6.8 0.7 — Write-offs, net of recoveries (3.6 ) (1.9 ) (1.5 ) (2.4 ) (1.7 ) 0.5 Allowance at end of period $ 40.6 $ 35.1 $ 34.5 $ 27.0 $ 5.3 $ 7.1

Note 2 - Revenue

Note 2 - Revenue	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	2. The following tables show revenue disaggregated by source and customer type. Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire Gas Utility: Residential $ 730.2 $ 687.3 $ 1,248.2 $ 1,029.3 Commercial and industrial 260.3 85.6 430.9 189.4 Transportation 33.3 33.5 64.2 64.7 Off-system and other incentive 6.1 12.0 13.7 16.8 Other customer revenue 4.3 6.5 8.7 10.1 Total revenue from contracts with customers 1,034.2 824.9 1,765.7 1,310.3 Changes in accrued revenue under alternative revenue programs 20.3 (7.5 ) 21.8 10.6 Total Gas Utility operating revenues 1,054.5 817.4 1,787.5 1,320.9 Gas Marketing 60.6 59.4 134.7 107.3 Midstream 16.5 13.8 31.7 26.7 Other 4.1 4.3 8.1 8.0 Total before eliminations 1,135.7 894.9 1,962.0 1,462.9 Intersegment eliminations (see Note 10, Information by Operating Segment) (12.3 ) (14.0 ) (24.6 ) (26.6 ) Total Operating Revenues $ 1,123.4 $ 880.9 $ 1,937.4 $ 1,436.3 Spire Missouri Residential $ 570.0 $ 529.1 $ 970.6 $ 776.2 Commercial and industrial 185.2 19.9 308.1 88.1 Transportation 9.9 10.1 19.0 19.3 Off-system and other incentive 4.5 11.3 9.6 15.8 Other customer revenue 4.3 3.6 6.3 5.9 Total revenue from contracts with customers 773.9 574.0 1,313.6 905.3 Changes in accrued revenue under alternative revenue programs 17.1 (2.8 ) 18.6 13.8 Total Operating Revenues $ 791.0 $ 571.2 $ 1,332.2 $ 919.1 Spire Alabama Residential $ 135.1 $ 129.9 $ 231.4 $ 210.0 Commercial and industrial 61.5 51.6 95.1 77.6 Transportation 20.8 20.7 40.1 40.1 Off-system and other incentive 1.7 0.6 4.1 1.0 Other customer revenue 0.7 1.9 1.9 2.7 Total revenue from contracts with customers 219.8 204.7 372.6 331.4 Changes in accrued revenue under alternative revenue programs (1.5 ) (0.6 ) (1.9 ) (0.7 ) Total Operating Revenues $ 218.3 $ 204.1 $ 370.7 $ 330.7 Gross receipts taxes associated with the Company’s natural gas utility services are imposed on the Company, Spire Missouri, and Spire Alabama and billed to its customers. The expense amounts (shown in the table below) are reported gross in the “Taxes, other than income taxes” line in the statements of income, and corresponding revenues are reported in “Operating Revenues.” Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire $ 60.2 $ 51.9 $ 90.6 $ 73.8 Spire Missouri 45.6 39.0 67.7 53.9 Spire Alabama 12.6 11.3 19.4 17.0

Note 3 - Earnings Per Common Sh

Note 3 - Earnings Per Common Share	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Earnings Per Share [Text Block]	3. Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Basic Earnings Per Common Share: Net Income $ 179.2 $ 173.6 $ 270.2 $ 229.3 Less: Provision for preferred dividends 3.7 3.7 7.4 7.4 Income allocated to participating securities 0.4 0.2 0.5 0.3 Income Available to Common Shareholders $ 175.1 $ 169.7 $ 262.3 $ 221.6 Weighted Average Common Shares Outstanding (in millions) 52.5 51.8 52.5 51.7 Basic Earnings Per Common Share $ 3.33 $ 3.27 $ 5.00 $ 4.28 Diluted Earnings Per Common Share: Net Income $ 179.2 $ 173.6 $ 270.2 $ 229.3 Less: Provision for preferred dividends 3.7 3.7 7.4 7.4 Income allocated to participating securities 0.4 0.2 0.5 0.3 Income Available to Common Shareholders $ 175.1 $ 169.7 $ 262.3 $ 221.6 Weighted Average Common Shares Outstanding (in millions) 52.5 51.8 52.5 51.7 Dilutive Effect of forward sales of common stock, restricted stock and restricted stock units (in millions)* 0.1 0.1 0.1 0.1 Weighted Average Diluted Common Shares (in millions) 52.6 51.9 52.6 51.8 Diluted Earnings Per Common Share $ 3.33 $ 3.27 $ 4.99 $ 4.28 * Calculation excludes certain outstanding or potential common shares (shown in millions by period at the right) attributable to (1) forward sales of common stock, (2) stock units subject to performance or market conditions, and (3) restricted stock, which could have a dilutive effect in the future 0.5 0.2 0.4 0.2

Note 4 - Shareholders' Equity

Note 4 - Shareholders' Equity	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Equity [Text Block]	4. EQUITY ATM Program On February 6, 2019, May 14, 2019, may may April 28, 2022, May 9, 2022. Settled sales under this ATM program are included in “Common stock issued” in the Condensed Consolidated Statements of Shareholders’ Equity. Also, in the second 2023, September 28, 2023. No March 31, 2023, As of March 31, 2023, may May 2025.

Note 5 - Regulatory Matters

Note 5 - Regulatory Matters	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Public Utilities Disclosure [Text Block]	5. As explained in Note 1 980, Regulated Operations March 31, 2023 September 30, 2022 March 31, 2022 March 31, September 30, March 31, Spire 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 115.3 $ 322.2 $ 146.6 Other 27.7 33.2 17.4 Total Current Regulatory Assets 143.0 355.4 164.0 Noncurrent: Pension and postretirement benefit costs 273.1 294.5 314.8 Cost of removal 516.4 493.7 456.3 Future income taxes due from customers 139.3 137.8 138.0 Energy efficiency 59.4 57.2 53.1 Unamortized purchased gas adjustments 181.3 — 35.2 Other 147.2 129.2 109.4 Total Noncurrent Regulatory Assets 1,316.7 1,112.4 1,106.8 Total Regulatory Assets $ 1,459.7 $ 1,467.8 $ 1,270.8 Regulatory Liabilities: Current: Other $ 5.3 $ 3.7 $ 3.2 Total Current Regulatory Liabilities 5.3 3.7 3.2 Noncurrent: Deferred taxes due to customers 135.8 145.3 152.1 Pension and postretirement benefit costs 161.0 172.6 179.4 Accrued cost of removal 34.6 32.9 38.3 Unamortized purchased gas adjustments — 53.0 17.1 Other 28.9 14.4 13.5 Total Noncurrent Regulatory Liabilities 360.3 418.2 400.4 Total Regulatory Liabilities $ 365.6 $ 421.9 $ 403.6 March 31, September 30, March 31, Spire Missouri 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 58.7 $ 275.1 $ 112.5 Other 4.0 13.0 0.2 Total Current Regulatory Assets 62.7 288.1 112.7 Noncurrent: Future income taxes due from customers 130.9 129.2 129.3 Pension and postretirement benefit costs 195.5 222.9 227.5 Energy efficiency 59.4 57.2 53.1 Unamortized purchased gas adjustments 181.3 — 35.2 Cost of removal 24.2 25.2 34.9 Other 130.7 113.1 92.7 Total Noncurrent Regulatory Assets 722.0 547.6 572.7 Total Regulatory Assets $ 784.7 $ 835.7 $ 685.4 Regulatory Liabilities: Noncurrent: Deferred taxes due to customers $ 121.3 $ 127.9 $ 134.7 Pension and postretirement benefit costs 132.7 143.6 148.3 Accrued cost of removal — — 5.7 Unamortized purchased gas adjustments — 53.0 17.1 Other 22.9 7.3 7.9 Total Noncurrent Regulatory Liabilities 276.9 331.8 313.7 Total Regulatory Liabilities $ 276.9 $ 331.8 $ 313.7 March 31, September 30, March 31, Spire Alabama 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 53.6 $ 43.8 $ 31.0 Other 11.2 13.1 10.0 Total Current Regulatory Assets 64.8 56.9 41.0 Noncurrent: Future income taxes due from customers 2.0 2.2 2.2 Pension and postretirement benefit costs 73.1 66.5 82.0 Cost of removal 492.2 468.5 421.4 Other 1.0 1.0 1.1 Total Noncurrent Regulatory Assets 568.3 538.2 506.7 Total Regulatory Assets $ 633.1 $ 595.1 $ 547.7 Regulatory Liabilities: Noncurrent: Pension and postretirement benefit costs $ 18.0 $ 19.4 $ 21.1 Other 3.5 3.6 3.6 Total Noncurrent Regulatory Liabilities 21.5 23.0 24.7 Total Regulatory Liabilities $ 21.5 $ 23.0 $ 24.7 A portion of the Company’s and Spire Missouri’s regulatory assets are not March 31, September 30, March 31, 2023 2022 2022 Spire Pension and postretirement benefit costs $ 127.8 $ 152.9 $ 152.0 Future income taxes due from customers 137.2 135.6 135.7 Unamortized purchased gas adjustments 240.0 275.1 147.7 Other 102.4 122.7 120.2 Total Regulatory Assets Not Earning a Return $ 607.4 $ 686.3 $ 555.6 Spire Missouri Pension and postretirement benefit costs $ 127.8 $ 152.9 $ 152.0 Future income taxes due from customers 130.9 129.2 129.3 Unamortized purchased gas adjustments 240.0 275.1 147.7 Other 102.4 122.7 120.2 Total Regulatory Assets Not Earning a Return $ 601.1 $ 679.9 $ 549.2 Like all the Company’s regulatory assets, these regulatory assets as of March 31, 2023 two not not 35 not not Spire Missouri In mid- February 2021, third three not February 2022, second 2022. three May 2022, In the first 2022, December 23, 2021 December 23, 2021 September 30, 2022 On April 1, 2022, November 4, 2022. November 18, 2022, ding $19.0 alre December 26, 2022. The ISRS allows Spire Missouri expedited recovery for its investment to replace qualifying components of its infrastructure without the necessity of a formal rate case. As noted above, all prior ISRS revenues were reset to zero December 26, 2022 April 20, 2023, October 2022 February 2023. May 6, 2023. The Utilities purchase the natural gas to be delivered to their customers and typically defer the recovery of this expense thereby lessening the immediate impact on customers’ bills of higher realized commodity costs. These deferred gas balances are expected to be recovered over the next 12 November January November 29, 2022 January 19, 2023, On May 27, 2022, first no July 11, 2022, July 29 August 1, 2022, July 25- 26, 2023. January 6, 2023, January 25, 2023, April 28, 2023, No May 2023. The MoPSC has initiated their annual ACA dockets (GR- 2022 0135 2022 0136 2020 2021 December 15, 2022, Spire Missouri filed its responses to these Reports and Recommendations on January 19, 2023. no May 22, 2023. Spire Alabama On October 26, 2022, September 30, 2023, 2017 January 1, 2023. Spire Alabama filed GSA rate increases effective December 1, 2022, January 1, 2023, Spire In addition to those discussed above for Spire Missouri and Spire Alabama, Spire is affected by the following regulatory matters. In October 2022, 2023 January 1, 2023. On September 14, 2022, June 30, 2022, December 6, 2022, January 1, 2023. In August 2018, “August 2018 November 2019, August 2018 one January 2020, two June 22, 2021, September 14, 2021 December 3, 2021, December 15, 2022, January 17, 2023, December 15, 2022 February 17, 2023, April 20, 2023, 60 June 19, 2023,

Note 6 - Financing

Note 6 - Financing	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Debt Disclosure [Text Block]	6. Short-term Spire, Spire Missouri and Spire Alabama have a syndicated revolving credit facility pursuant to a loan agreement with 12 July 22, 2022, July 22, 2027. may three $1,300.0 may no March 31, 2023 March 31, 2023 Spire utilizes a commercial paper program (“CP Program”) pursuant to which Spire may may not may 365 In March 2021, March 2022. On January 5, 2023, October 5, 2023. one three Information about short-term borrowings, including Spire Missouri’s and Spire Alabama’s borrowings from Spire, is presented in the following table. As of March 31, 2023 Spire (Parent Only) Spire Missouri Spire Alabama Spire CP Term Spire Spire Consol- Program Loan Note Note idated Six Months Ended March 31, 2023 Highest borrowings outstanding $ 1,282.0 $ 250.0 $ 656.9 $ 274.0 $ 1,482.0 Lowest borrowings outstanding 354.4 — 3.8 76.7 554.4 Weighted average borrowings 922.7 111.0 383.6 134.9 1,033.7 Weighted average interest rate 4.6 % 5.4 % 4.5 % 4.6 % 4.7 % As of March 31, 2023 Borrowings outstanding $ 361.0 $ 200.0 $ 60.7 $ 121.3 $ 561.0 Weighted average interest rate 5.3 % 5.6 % 5.3 % 5.3 % 5.4 % As of September 30, 2022 Borrowings outstanding $ 1,037.5 $ — $ 445.3 $ 260.9 $ 1,037.5 Weighted average interest rate 3.3 % 0.0 % 3.3 % 3.3 % 3.3 % As of March 31, 2022 Borrowings outstanding $ 607.1 $ — $ 277.2 $ 156.6 $ 607.1 Weighted average interest rate 0.9 % 0.0 % 0.9 % 0.9 % 0.9 % Long-term The long-term debt agreements of Spire, Spire Missouri and Spire Alabama contain customary financial covenants and default provisions. As of March 31, 2023 no Interest expense shown on the statements of income is net of the capitalized interest amounts shown in the following table. Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire $ 1.9 $ 1.0 $ 3.5 $ 2.1 Spire Missouri 0.6 0.1 1.1 0.1 Spire Alabama 0.6 0.8 1.3 1.6 On October 13, 2022, October 15, 2029, October 15, 2032, October 13, 2022, first October 15, 2037, first may On February 13, 2023, 2033. The notes are senior secured indebtedness of Spire Missouri and rank equally with all other existing and future senior secured indebtedness issued by Spire Missouri under its mortgage and deed of trust. The bonds are secured by a first On March 7, 2023, 2023 March 15, 2033. In the quarter ended March 31, 2023, 10 two

Note 7 - Fair Value of Financia

Note 7 - Fair Value of Financial Instruments	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Fair Value Disclosures [Text Block]	7. The carrying amounts of cash and cash equivalents, notes receivable, and short-term debt approximate fair value due to the short maturity of these instruments. The fair values of long-term debt are estimated based on market prices for similar issues. Refer to Note 8 The carrying amounts and estimated fair values of financial instruments not no 3 March 31, 2023 September 30, 2022 March 31, 2022 Classification of Estimated Fair Value Carrying Amount Fair Value Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Spire As of March 31, 2023 Cash and cash equivalents $ 6.9 $ 6.9 $ 6.9 $ — Notes payable 561.0 561.0 — 561.0 Long-term debt, including current portion 3,959.1 3,704.2 — 3,704.2 As of September 30, 2022 Cash and cash equivalents $ 6.5 $ 6.5 $ 6.5 $ — Notes payable 1,037.5 1,037.5 — 1,037.5 Long-term debt, including current portion 3,239.7 2,851.8 — 2,851.8 As of March 31, 2022 Cash and cash equivalents $ 8.3 $ 8.3 $ 8.3 $ — Notes payable 607.1 607.1 — 607.1 Long-term debt, including current portion 3,238.5 3,299.1 — 3,299.1 Spire Missouri As of March 31, 2023 Notes payable $ 200.0 $ 200.0 $ — $ 200.0 Notes payable – associated companies 60.7 60.7 — 60.7 Long-term debt, including current portion 2,034.5 1,930.2 — 1,930.2 As of September 30, 2022 Notes payable – associated companies $ 445.3 $ 445.3 $ — $ 445.3 Long-term debt, including current portion 1,637.7 1,473.9 — 1,473.9 As of March 31, 2022 Notes payable – associated companies $ 277.2 $ 277.2 $ — $ 277.2 Long-term debt 1,637.1 1,691.9 — 1,691.9 Spire Alabama As of March 31, 2023 Cash and cash equivalents $ 1.0 $ 1.0 $ 1.0 $ — Notes payable – associated companies 121.3 121.3 — 121.3 Long-term debt 745.7 696.6 — 696.6 As of September 30, 2022 Cash and cash equivalents $ 2.4 $ 2.4 $ 2.4 $ — Notes payable – associated companies 260.9 260.9 — 260.9 Long-term debt 571.5 485.0 — 485.0 As of March 31, 2022 Cash and cash equivalents $ 0.2 $ 0.2 $ 0.2 $ — Notes payable – associated companies 156.6 156.6 — 156.6 Long-term debt 571.4 588.0 — 588.0

Note 8 - Fair Value Measurement

Note 8 - Fair Value Measurements	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]	8. The information presented in the following tables categorizes the assets and liabilities in the balance sheets that are accounted for at fair value on a recurring basis in periods subsequent to initial recognition. The mutual funds included in Level 1 Derivative instruments included in Level 1 2 2 3 no 3 March 31, 2023 September 30, 2022 March 31, 2022 The mutual funds are included in “Other Investments” on the Company’s balance sheets and in “Other Property and Investments” on Spire Missouri’s balance sheets. Changes in their recurring valuations are recorded as unrealized gains or losses in the corresponding income statement. Derivative assets and liabilities, including receivables and payables associated with cash margin requirements, are presented net in the balance sheets when a legally enforceable netting agreement exists between the Company, Spire Missouri, or Spire Alabama and the counterparty to a derivative contract. Spire Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of March 31, 2023 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 20.7 $ — $ — $ 20.7 NYMEX/ICE natural gas contracts 0.1 — (0.1 ) — Gas Marketing: NYMEX/ICE natural gas contracts 31.9 — (31.9 ) — Natural gas commodity contracts 39.2 — (1.3 ) 37.9 Other: U.S. stock/bond mutual funds 29.2 — — 29.2 Interest rate swaps 16.5 — — 16.5 Total $ 137.6 $ — $ (33.3 ) $ 104.3 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 62.7 $ — $ (62.7 ) $ — Gasoline and heating oil contracts 0.5 — (0.5 ) — Gas Marketing: NYMEX/ICE natural gas contracts 48.1 — (48.1 ) — Natural gas commodity contracts 32.4 — (1.3 ) 31.1 Other: Interest rate swaps 2.2 — — 2.2 Total $ 145.9 $ — $ (112.6 ) $ 33.3 Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of September 30, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 19.1 $ — $ — $ 19.1 NYMEX/ICE natural gas contracts 57.8 — (57.8 ) — Gas Marketing: NYMEX/ICE natural gas contracts 91.8 — (91.8 ) — Natural gas commodity contracts 56.6 — (4.0 ) 52.6 Other: U.S. stock/bond mutual funds 29.3 — — 29.3 Interest rate swaps 63.6 — — 63.6 Total $ 318.2 $ — $ (153.6 ) $ 164.6 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 30.7 $ — $ (30.7 ) $ — Gas Marketing: NYMEX/ICE natural gas contracts 82.3 — (82.3 ) — Natural gas commodity contracts 65.5 — (4.0 ) 61.5 Total $ 178.5 $ — $ (117.0 ) $ 61.5 As of March 31, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 23.0 $ — $ — $ 23.0 NYMEX/ICE natural gas contracts 58.9 — (58.9 ) — Gas Marketing: NYMEX/ICE natural gas contracts 96.1 — (88.4 ) 7.7 Natural gas commodity contracts 30.8 — (1.0 ) 29.8 Other: U.S. stock/bond mutual funds 24.1 — — 24.1 Interest rate swaps 28.8 — (7.9 ) 20.9 Total $ 261.7 $ — $ (156.2 ) $ 105.5 LIABILITIES Gas Marketing: NYMEX/ICE natural gas contracts $ 40.4 $ — $ (40.4 ) $ — Natural gas commodity contracts 106.2 — (1.0 ) 105.2 Other: Interest rate swaps 7.9 — (7.9 ) — Total $ 154.5 $ — $ (49.3 ) $ 105.2 Spire Missouri Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of March 31, 2023 ASSETS U.S. stock/bond mutual funds $ 20.7 $ — $ — $ 20.7 NYMEX/ICE natural gas contracts 0.1 — (0.1 ) — Total $ 20.8 $ — $ (0.1 ) $ 20.7 LIABILITIES NYMEX/ICE natural gas contracts $ 62.7 $ — $ (62.7 ) $ — Gasoline and heating oil contracts 0.5 — (0.5 ) — Total $ 63.2 $ — $ (63.2 ) $ — As of September 30, 2022 ASSETS U.S. stock/bond mutual funds $ 19.1 $ — $ — $ 19.1 NYMEX/ICE natural gas contracts 57.8 — (57.8 ) — Total $ 76.9 $ — $ (57.8 ) $ 19.1 LIABILITIES NYMEX/ICE natural gas contracts $ 30.7 $ — $ (30.7 ) $ — As of March 31, 2022 ASSETS U.S. stock/bond mutual funds $ 23.0 $ — $ — $ 23.0 NYMEX/ICE natural gas contracts 58.9 — (58.9 ) — Total $ 81.9 $ — $ (58.9 ) $ 23.0

Note 9 - Pension Plans and Othe

Note 9 - Pension Plans and Other Postretirement Benefits	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Retirement Benefits [Text Block]	9. Pension Plans Spire and the Utilities maintain pension plans for their employees. Spire Missouri and Spire Alabama have non-contributory, defined benefit, trusteed forms of pension plans covering the majority of their employees. Qualified plan assets are comprised of mutual and commingled funds consisting of U.S. equities with varying strategies, global equities, alternative investments, and fixed income investments. The net periodic pension cost includes components shown in the following tables. The components other than the service costs and regulatory adjustment are presented in “Other Income, Net” in the income statement, except for Spire Alabama’s losses on lump-sum settlements. Such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income, Net.” Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire Service cost – benefits earned during the period $ 3.9 $ 5.4 $ 8.0 $ 10.8 Interest cost on projected benefit obligation 5.9 5.3 12.3 10.4 Expected return on plan assets (5.7 ) (8.2 ) (12.1 ) (16.4 ) Amortization of prior service credit (1.2 ) (1.2 ) (2.3 ) (2.3 ) Amortization of actuarial loss 1.6 3.6 3.2 7.3 Loss on lump-sum settlements — 11.7 8.6 11.7 Subtotal 4.5 16.6 17.7 21.5 Regulatory adjustment 10.4 (1.2 ) 12.2 9.4 Net pension cost $ 14.9 $ 15.4 $ 29.9 $ 30.9 Spire Missouri Service cost – benefits earned during the period $ 2.9 $ 3.8 $ 5.7 $ 7.7 Interest cost on projected benefit obligation 4.4 3.6 8.9 7.1 Expected return on plan assets (4.5 ) (5.9 ) (9.0 ) (11.9 ) Amortization of prior service credit (0.5 ) (0.5 ) (1.0 ) (1.0 ) Amortization of actuarial loss 1.6 2.8 3.1 5.6 Loss on lump-sum settlements — 6.8 — 6.8 Subtotal 3.9 10.6 7.7 14.3 Regulatory adjustment 8.1 1.1 16.2 9.6 Net pension cost $ 12.0 $ 11.7 $ 23.9 $ 23.9 Spire Alabama Service cost – benefits earned during the period $ 0.8 $ 1.3 $ 1.9 $ 2.7 Interest cost on projected benefit obligation 0.8 1.2 2.1 2.3 Expected return on plan assets (0.5 ) (1.4 ) (1.6 ) (2.8 ) Amortization of prior service credit (0.6 ) (0.6 ) (1.2 ) (1.2 ) Amortization of actuarial loss 0.2 0.8 0.3 1.7 Loss on lump-sum settlements — 4.9 8.6 4.9 Subtotal 0.7 6.2 10.1 7.6 Regulatory adjustment 2.1 (2.5 ) (4.4 ) (0.6 ) Net pension cost $ 2.8 $ 3.7 $ 5.7 $ 7.0 Pursuant to the provisions of Spire Missouri’s and Spire Alabama’s pension plans, pension obligations may three six March 31, 2023 two one September 30, 2022. one six March 31, 2023 For the three six March 31, 2022, one two September 30, 2021, first second September 30, 2021. 12.3 one 12.6 second March 31, 2022. Effective December 23, 2021, Also effective December 23, 2021, eight eight eight eight The funding policy of the Utilities is to contribute an amount not 2023 March 31, 2023 2023 March 31, 2023 2023 2023 Other Postretirement Benefits Spire and the Utilities provide certain life insurance benefits at retirement. Spire Missouri plans provide for medical insurance after early retirement until age 65. January 1, 2015, The net periodic postretirement benefit cost includes components shown in the following tables. The components other than the service costs and regulatory adjustment are presented in “Other Income, Net” in the income statement, except in the event Spire Alabama incurs losses on lump-sum settlements. Any such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income, Net.” Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire Service cost – benefits earned during the period $ 1.2 $ 2.0 $ 2.4 $ 3.9 Interest cost on accumulated postretirement benefit obligation 2.2 1.5 4.3 3.0 Expected return on plan assets (3.9 ) (4.3 ) (7.8 ) (8.5 ) Amortization of prior service cost — 0.2 0.1 0.5 Amortization of actuarial gain (1.1 ) (0.6 ) (2.1 ) (1.2 ) Subtotal (1.6 ) (1.2 ) (3.1 ) (2.3 ) Regulatory adjustment 0.2 0.1 0.3 3.3 Net postretirement benefit (income) cost $ (1.4 ) $ (1.1 ) $ (2.8 ) $ 1.0 Spire Missouri Service cost – benefits earned during the period $ 1.0 $ 1.6 $ 2.0 $ 3.2 Interest cost on accumulated postretirement benefit obligation 1.7 1.1 3.3 2.2 Expected return on plan assets (2.7 ) (2.9 ) (5.3 ) (5.7 ) Amortization of prior service cost 0.1 0.2 0.3 0.4 Amortization of actuarial gain (0.8 ) (0.5 ) (1.6 ) (1.0 ) Subtotal (0.7 ) (0.5 ) (1.3 ) (0.9 ) Regulatory adjustment 0.7 0.5 1.3 4.1 Net postretirement benefit cost $ — $ — $ — $ 3.2 Spire Alabama Service cost – benefits earned during the period $ 0.1 $ 0.3 $ 0.3 $ 0.6 Interest cost on accumulated postretirement benefit obligation 0.5 0.3 0.9 0.7 Expected return on plan assets (1.3 ) (1.3 ) (2.5 ) (2.6 ) Amortization of prior service (credit) cost (0.1 ) — (0.2 ) 0.1 Amortization of actuarial gain (0.2 ) — (0.3 ) — Subtotal (1.0 ) (0.7 ) (1.8 ) (1.2 ) Regulatory adjustment (0.4 ) (0.4 ) (0.9 ) (0.9 ) Net postretirement benefit income $ (1.4 ) $ (1.1 ) $ (2.7 ) $ (2.1 ) Missouri and Alabama state laws provide for the recovery in rates of costs accrued pursuant to GAAP provided that such costs are funded through an independent, external funding mechanism. The Utilities have established Voluntary Employees’ Beneficiary Association (VEBA) and Rabbi Trusts as external funding mechanisms. The assets of the VEBA and Rabbi Trusts consist primarily of money market securities and mutual funds invested in stocks and bonds. Effective December 23, 2021, no The Utilities’ funding policy is to contribute amounts to the trusts equal to the periodic benefit cost calculated pursuant to GAAP as recovered in rates. There have been no contributions to the postretirement plans through March 31, 2023

Note 10 - Information by Operat

Note 10 - Information by Operating Segment	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	10. The Company has three reportable segments: Gas Utility, Gas Marketing, and Midstream. The Gas Utility segment is the aggregation of the operations of the Utilities. The Gas Marketing segment includes the results of Spire Marketing, a subsidiary engaged in the non-regulated marketing of natural gas and related activities, including utilizing natural gas storage contracts for providing natural gas sales. The Midstream segment includes Spire STL Pipeline, a subsidiary of Spire providing interstate natural gas pipeline transportation services, and Spire Storage, a subsidiary of Spire providing interstate natural gas storage services. Other components of the Company’s consolidated information include Spire's subsidiaries engaged in the operation of a propane pipeline and risk management, among other activities, and unallocated corporate items, including certain debt and associated interest costs. Accounting policies are described in Note 1 Management evaluates the performance of the operating segments based on the computation of net economic earnings. Net economic earnings exclude from reported net income the after-tax impacts of fair value accounting and timing adjustments associated with energy-related transactions, the impacts of acquisition, divestiture and restructuring activities, and the largely non-cash impacts of impairments and other non-recurring or unusual items such as certain regulatory, legislative, or GAAP standard-setting actions. Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended March 31, 2023 Operating Revenues: Revenues from external customers $ 1,054.4 $ 60.6 $ 8.2 $ 0.2 $ — $ 1,123.4 Intersegment revenues 0.1 — 8.3 3.9 (12.3 ) — Total Operating Revenues 1,054.5 60.6 16.5 4.1 (12.3 ) 1,123.4 Operating Expenses: Natural gas 543.3 51.5 — — (8.3 ) 586.5 Operation and maintenance 119.3 5.7 6.2 4.9 (4.0 ) 132.1 Depreciation and amortization 60.2 0.4 2.0 — — 62.6 Taxes, other than income taxes 80.4 0.6 0.8 0.1 — 81.9 Total Operating Expenses 803.2 58.2 9.0 5.0 (12.3 ) 863.1 Operating Income (Loss) $ 251.3 $ 2.4 $ 7.5 $ (0.9 ) $ — $ 260.3 Net Economic Earnings (Loss) $ 183.9 $ 21.8 $ 4.2 $ (10.7 ) $ — $ 199.2 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended March 31, 2022 Operating Revenues: Revenues from external customers $ 817.4 $ 59.4 $ 4.0 $ 0.1 $ — $ 880.9 Intersegment revenues — — 9.8 4.2 (14.0 ) — Total Operating Revenues 817.4 59.4 13.8 4.3 (14.0 ) 880.9 Operating Expenses: Natural gas 356.0 45.8 — — (9.8 ) 392.0 Operation and maintenance 104.2 3.2 5.8 4.2 (4.2 ) 113.2 Depreciation and amortization 56.5 0.4 1.9 0.1 — 58.9 Taxes, other than income taxes 70.3 0.4 0.9 — — 71.6 Total Operating Expenses 587.0 49.8 8.6 4.3 (14.0 ) 635.7 Operating Income $ 230.4 $ 9.6 $ 5.2 $ — $ — $ 245.2 Net Economic Earnings (Loss) $ 169.2 $ 14.4 $ 3.0 $ (5.6 ) $ — $ 181.0 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Six Months Ended March 31, 2023 Operating Revenues: Revenues from external customers $ 1,787.4 $ 134.7 $ 15.0 $ 0.3 $ — $ 1,937.4 Intersegment revenues 0.1 — 16.7 7.8 (24.6 ) — Total Operating Revenues 1,787.5 134.7 31.7 8.1 (24.6 ) 1,937.4 Operating Expenses: Natural gas 944.9 77.5 — — (16.7 ) 1,005.7 Operation and maintenance 239.2 12.0 12.0 8.9 (7.9 ) 264.2 Depreciation and amortization 119.9 0.7 3.9 0.2 — 124.7 Taxes, other than income taxes 130.3 0.7 1.2 0.1 — 132.3 Total Operating Expenses 1,434.3 90.9 17.1 9.2 (24.6 ) 1,526.9 Operating Income (Loss) $ 353.2 $ 43.8 $ 14.6 $ (1.1 ) $ — $ 410.5 Net Economic Earnings (Loss) $ 246.8 $ 47.5 $ 8.0 $ (18.0 ) $ — $ 284.3 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Six Months Ended March 31, 2022 Operating Revenues: Revenues from external customers $ 1,320.9 $ 107.3 $ 7.8 $ 0.3 $ — $ 1,436.3 Intersegment revenues — — 18.9 7.7 (26.6 ) — Total Operating Revenues 1,320.9 107.3 26.7 8.0 (26.6 ) 1,436.3 Operating Expenses: Natural gas 566.2 93.8 — — (18.8 ) 641.2 Operation and maintenance 211.5 5.9 11.6 8.4 (7.8 ) 229.6 Depreciation and amortization 111.1 0.7 3.8 0.2 — 115.8 Taxes, other than income taxes 107.3 0.4 1.5 — — 109.2 Total Operating Expenses 996.1 100.8 16.9 8.6 (26.6 ) 1,095.8 Operating Income (Loss) $ 324.8 $ 6.5 $ 9.8 $ (0.6 ) $ — $ 340.5 Net Economic Earnings (Loss) $ 236.4 $ 14.9 $ 5.5 $ (13.2 ) $ — $ 243.6 The following table reconciles the Company’s net economic earnings to net income. Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Net Income $ 179.2 $ 173.6 $ 270.2 $ 229.3 Adjustments, pre-tax: Fair value and timing adjustments 26.6 9.9 18.8 13.6 Income tax adjustments (6.6 ) (2.5 ) (4.7 ) 0.7 Net Economic Earnings $ 199.2 $ 181.0 $ 284.3 $ 243.6 The Company’s total assets by segment were as follows: March 31, September 30, March 31, 2023 2022 2022 Total Assets: Gas Utility $ 8,317.6 $ 8,042.8 $ 7,684.1 Gas Marketing 335.0 638.7 431.1 Midstream 506.2 446.0 420.3 Other 1,959.1 2,449.2 2,123.5 Eliminations (1,068.9 ) (1,493.0 ) (1,257.7 ) Total Assets $ 10,049.0 $ 10,083.7 $ 9,401.3

Note 11 - Commitments and Conti

Note 11 - Commitments and Contingencies	6 Months Ended
	Mar. 31, 2023
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	11. Commitments The Company and the Utilities have entered into contracts with various counterparties, expiring on dates through calendar 2039, March 31, 2023 November April. A consolidated subsidiary of Spire is a limited partner in an unconsolidated partnership focusing on sustainability initiatives largely tied to the natural gas utility sector. Spire committed to contribute a total of $10.0 of capital to the partnership as and when requested by the general partner. As of March 31, 2023 Contingencies The Company and the Utilities account for contingencies, including environmental liabilities, in accordance with accounting standards under the loss contingency guidance of ASC Topic 450, Contingencies In addition to matters noted below, the Company and the Utilities are involved in other litigation, claims, and investigations arising in the normal course of business. Management, after discussion with counsel, believes the final outcome will not The Company and the Utilities own and operate natural gas distribution, transmission, and storage facilities, the operations of which are subject to various environmental laws, regulations, and interpretations. While environmental issues resulting from such operations arise in the ordinary course of business, such issues have not may may may In the natural gas industry, many gas distribution companies have incurred environmental liabilities associated with sites they or their predecessor companies formerly owned or operated where manufactured gas operations took place. The Utilities each have former manufactured gas plant (MGP) operations in their respective service territories, some of which are discussed under the Spire Missouri and Spire Alabama headings below. To the extent costs are incurred associated with environmental remediation activities, the Utilities would request authority from their respective regulators to defer such costs (less any amounts received from insurance proceeds or as contributions from other potentially responsible parties (PRPs)) and collect them through future rates. To date, costs incurred for all Spire MGP sites for investigation, remediation and monitoring have not may may In 2020, March 2021, not may Spire Missouri Spire Missouri has identified three two third In conjunction with redevelopment of the Carondelet Coke site, Spire Missouri and another former owner of the site entered into an agreement (the “Remediation Agreement”) with the City development agencies, the developer, and an environmental consultant that obligates one No December 20, 2010, seven six In a letter dated June 29, 2011, second January 10, 2012, no Additionally, in correspondence dated November 30, 2016, 7 107 1980 third not March 2017 Spire Missouri has notified its insurers that it seeks reimbursement for costs incurred in the past and future potential liabilities associated with these MGP sites. While some of the insurers have denied coverage and reserved their rights, Spire Missouri retains the right to seek potential reimbursements from them. On March 10, 2015, 104 7 April 3, 2015, July 15, 2015, August 15, 2015. no In its western service area, Spire Missouri has six #1, #1, #2. 2003 September 15, 2016, six May 11, 2015, Spire Alabama Spire Alabama is in the chain of title of nine four five one In 2011, In 2012, 104 35th not 35th Assessments were performed by the EPA of the former MGP sites in Gadsden and Anniston, and NFA letters were received after each assessment. Spire In addition to those discussed above for Spire Missouri and Spire Alabama, Spire is aware of the following contingent matters. Spire Marketing, along with many natural gas industry participants, faced the unprecedented effects of Winter Storm Uri in February 2021. may

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	BASIS OF PRESENTATION The accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information with the instructions to Form 10 10 01 not 10 10 September 30, 2022 The consolidated financial position, results of operations, and cash flows of Spire include the accounts of the Company and all its subsidiaries. Transactions and balances between consolidated entities have been eliminated from the consolidated financial statements of Spire. In compliance with GAAP, transactions between Spire Missouri and Spire Alabama and their affiliates, as well as intercompany balances on their balance sheets, have not Certain information is presented by reportable segment, as described below. Effective during the first 2023, NATURE OF OPERATIONS three Note 10 The Company’s earnings are derived primarily from its Gas Utility segment. Due to the seasonal nature of the Utilities’ business and the volumetric Spire Missouri rate design, earnings are typically concentrated during the heating season of November April not
Public Utilities, Policy [Policy Text Block]	REGULATED OPERATIONS 980, Regulated Operations third may As authorized by the Missouri Public Service Commission (MoPSC), the Mississippi Public Service Commission (MSPSC) and the Alabama Public Service Commission (APSC), the Purchased Gas Adjustment (PGA) clauses and Gas Supply Adjustment (GSA) riders allow the Utilities to pass through to customers the cost of purchased gas supplies. Regulatory assets and liabilities related to the PGA clauses and the GSA riders are both labeled Unamortized Purchased Gas Adjustments herein. See additional information about regulatory assets and liabilities in Note 5
Derivatives, Policy [Policy Text Block]	DERIVATIVES 815, Derivatives and Hedging not
Transactions With Affiliates [Policy Text Block]	TRANSACTIONS WITH AFFILIATES Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire Missouri Purchases of natural gas from Spire Marketing $ 13.8 $ 17.9 $ 42.3 $ 36.1 Transportation services received from Spire STL Pipeline 7.8 7.8 15.9 15.9 Sales of natural gas to Spire Marketing 0.1 — 0.1 — Spire Alabama Purchases of natural gas from Spire Marketing $ — $ — $ 1.1 $ —
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	RESTRICTED CASH AND OTHER INVESTMENTS March 31, 2023 March 31, 2023 September 30, 2022 March 31, 2022, A subsidiary of Spire Storage, in the Midstream segment, acquired a natural gas storage facility in northern Oklahoma formerly known as Salt Plains Storage on April 1, 2023. third June 30, 2023, March 31, 2023,
Accrued Capital Expenditures [Policy Text Block]	ACCRUED CAPITAL EXPENDITURES March 31, September 30, March 31, 2023 2022 2022 Spire $ 66.3 $ 77.8 $ 38.8 Spire Missouri 35.4 45.6 28.7 Spire Alabama 5.2 19.2 5.0
Receivable [Policy Text Block]	ACCOUNTS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES not Spire Spire Missouri Spire Alabama Three Months Ended March 31, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 34.5 $ 31.4 $ 28.2 $ 23.8 $ 5.5 $ 6.7 Provision for expected credit losses 8.2 5.2 7.3 4.7 0.5 0.5 Write-offs, net of recoveries (2.1 ) (1.5 ) (1.0 ) (1.5 ) (0.7 ) (0.1 ) Allowance at end of period $ 40.6 $ 35.1 $ 34.5 $ 27.0 $ 5.3 $ 7.1 Six Months Ended March 31, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 31.9 $ 30.3 $ 24.9 $ 22.6 $ 6.3 $ 6.6 Provision for expected credit losses 12.3 6.7 11.1 6.8 0.7 — Write-offs, net of recoveries (3.6 ) (1.9 ) (1.5 ) (2.4 ) (1.7 ) 0.5 Allowance at end of period $ 40.6 $ 35.1 $ 34.5 $ 27.0 $ 5.3 $ 7.1

Note 1 - Summary of Significa_2

Note 1 - Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Mar. 31, 2023
Notes Tables
Schedule of Related Party Transactions [Table Text Block]	Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire Missouri Purchases of natural gas from Spire Marketing $ 13.8 $ 17.9 $ 42.3 $ 36.1 Transportation services received from Spire STL Pipeline 7.8 7.8 15.9 15.9 Sales of natural gas to Spire Marketing 0.1 — 0.1 — Spire Alabama Purchases of natural gas from Spire Marketing $ — $ — $ 1.1 $ —
Schedule Of Capital Expenditure Excluded From Statement Of Cash Flow [Table Text Block]	March 31, September 30, March 31, 2023 2022 2022 Spire $ 66.3 $ 77.8 $ 38.8 Spire Missouri 35.4 45.6 28.7 Spire Alabama 5.2 19.2 5.0
Accounts Receivable, Allowance for Credit Loss [Table Text Block]	Spire Spire Missouri Spire Alabama Three Months Ended March 31, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 34.5 $ 31.4 $ 28.2 $ 23.8 $ 5.5 $ 6.7 Provision for expected credit losses 8.2 5.2 7.3 4.7 0.5 0.5 Write-offs, net of recoveries (2.1 ) (1.5 ) (1.0 ) (1.5 ) (0.7 ) (0.1 ) Allowance at end of period $ 40.6 $ 35.1 $ 34.5 $ 27.0 $ 5.3 $ 7.1 Six Months Ended March 31, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 31.9 $ 30.3 $ 24.9 $ 22.6 $ 6.3 $ 6.6 Provision for expected credit losses 12.3 6.7 11.1 6.8 0.7 — Write-offs, net of recoveries (3.6 ) (1.9 ) (1.5 ) (2.4 ) (1.7 ) 0.5 Allowance at end of period $ 40.6 $ 35.1 $ 34.5 $ 27.0 $ 5.3 $ 7.1

Note 2 - Revenue (Tables)

Note 2 - Revenue (Tables)	6 Months Ended
	Mar. 31, 2023
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire Gas Utility: Residential $ 730.2 $ 687.3 $ 1,248.2 $ 1,029.3 Commercial and industrial 260.3 85.6 430.9 189.4 Transportation 33.3 33.5 64.2 64.7 Off-system and other incentive 6.1 12.0 13.7 16.8 Other customer revenue 4.3 6.5 8.7 10.1 Total revenue from contracts with customers 1,034.2 824.9 1,765.7 1,310.3 Changes in accrued revenue under alternative revenue programs 20.3 (7.5 ) 21.8 10.6 Total Gas Utility operating revenues 1,054.5 817.4 1,787.5 1,320.9 Gas Marketing 60.6 59.4 134.7 107.3 Midstream 16.5 13.8 31.7 26.7 Other 4.1 4.3 8.1 8.0 Total before eliminations 1,135.7 894.9 1,962.0 1,462.9 Intersegment eliminations (see Note 10, Information by Operating Segment) (12.3 ) (14.0 ) (24.6 ) (26.6 ) Total Operating Revenues $ 1,123.4 $ 880.9 $ 1,937.4 $ 1,436.3 Spire Missouri Residential $ 570.0 $ 529.1 $ 970.6 $ 776.2 Commercial and industrial 185.2 19.9 308.1 88.1 Transportation 9.9 10.1 19.0 19.3 Off-system and other incentive 4.5 11.3 9.6 15.8 Other customer revenue 4.3 3.6 6.3 5.9 Total revenue from contracts with customers 773.9 574.0 1,313.6 905.3 Changes in accrued revenue under alternative revenue programs 17.1 (2.8 ) 18.6 13.8 Total Operating Revenues $ 791.0 $ 571.2 $ 1,332.2 $ 919.1 Spire Alabama Residential $ 135.1 $ 129.9 $ 231.4 $ 210.0 Commercial and industrial 61.5 51.6 95.1 77.6 Transportation 20.8 20.7 40.1 40.1 Off-system and other incentive 1.7 0.6 4.1 1.0 Other customer revenue 0.7 1.9 1.9 2.7 Total revenue from contracts with customers 219.8 204.7 372.6 331.4 Changes in accrued revenue under alternative revenue programs (1.5 ) (0.6 ) (1.9 ) (0.7 ) Total Operating Revenues $ 218.3 $ 204.1 $ 370.7 $ 330.7
Schedule Of Taxes On Revenues [Table Text Block]	Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire $ 60.2 $ 51.9 $ 90.6 $ 73.8 Spire Missouri 45.6 39.0 67.7 53.9 Spire Alabama 12.6 11.3 19.4 17.0

Note 3 - Earnings Per Common _2

Note 3 - Earnings Per Common Share (Tables)	6 Months Ended
	Mar. 31, 2023
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Basic Earnings Per Common Share: Net Income $ 179.2 $ 173.6 $ 270.2 $ 229.3 Less: Provision for preferred dividends 3.7 3.7 7.4 7.4 Income allocated to participating securities 0.4 0.2 0.5 0.3 Income Available to Common Shareholders $ 175.1 $ 169.7 $ 262.3 $ 221.6 Weighted Average Common Shares Outstanding (in millions) 52.5 51.8 52.5 51.7 Basic Earnings Per Common Share $ 3.33 $ 3.27 $ 5.00 $ 4.28 Diluted Earnings Per Common Share: Net Income $ 179.2 $ 173.6 $ 270.2 $ 229.3 Less: Provision for preferred dividends 3.7 3.7 7.4 7.4 Income allocated to participating securities 0.4 0.2 0.5 0.3 Income Available to Common Shareholders $ 175.1 $ 169.7 $ 262.3 $ 221.6 Weighted Average Common Shares Outstanding (in millions) 52.5 51.8 52.5 51.7 Dilutive Effect of forward sales of common stock, restricted stock and restricted stock units (in millions)* 0.1 0.1 0.1 0.1 Weighted Average Diluted Common Shares (in millions) 52.6 51.9 52.6 51.8 Diluted Earnings Per Common Share $ 3.33 $ 3.27 $ 4.99 $ 4.28 * Calculation excludes certain outstanding or potential common shares (shown in millions by period at the right) attributable to (1) forward sales of common stock, (2) stock units subject to performance or market conditions, and (3) restricted stock, which could have a dilutive effect in the future 0.5 0.2 0.4 0.2

Note 5 - Regulatory Matters (Ta

Note 5 - Regulatory Matters (Tables)	6 Months Ended
	Mar. 31, 2023
Notes Tables
Schedule of Regulatory Assets and Liabilities [Table Text Block]	March 31, September 30, March 31, Spire 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 115.3 $ 322.2 $ 146.6 Other 27.7 33.2 17.4 Total Current Regulatory Assets 143.0 355.4 164.0 Noncurrent: Pension and postretirement benefit costs 273.1 294.5 314.8 Cost of removal 516.4 493.7 456.3 Future income taxes due from customers 139.3 137.8 138.0 Energy efficiency 59.4 57.2 53.1 Unamortized purchased gas adjustments 181.3 — 35.2 Other 147.2 129.2 109.4 Total Noncurrent Regulatory Assets 1,316.7 1,112.4 1,106.8 Total Regulatory Assets $ 1,459.7 $ 1,467.8 $ 1,270.8 Regulatory Liabilities: Current: Other $ 5.3 $ 3.7 $ 3.2 Total Current Regulatory Liabilities 5.3 3.7 3.2 Noncurrent: Deferred taxes due to customers 135.8 145.3 152.1 Pension and postretirement benefit costs 161.0 172.6 179.4 Accrued cost of removal 34.6 32.9 38.3 Unamortized purchased gas adjustments — 53.0 17.1 Other 28.9 14.4 13.5 Total Noncurrent Regulatory Liabilities 360.3 418.2 400.4 Total Regulatory Liabilities $ 365.6 $ 421.9 $ 403.6 March 31, September 30, March 31, Spire Missouri 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 58.7 $ 275.1 $ 112.5 Other 4.0 13.0 0.2 Total Current Regulatory Assets 62.7 288.1 112.7 Noncurrent: Future income taxes due from customers 130.9 129.2 129.3 Pension and postretirement benefit costs 195.5 222.9 227.5 Energy efficiency 59.4 57.2 53.1 Unamortized purchased gas adjustments 181.3 — 35.2 Cost of removal 24.2 25.2 34.9 Other 130.7 113.1 92.7 Total Noncurrent Regulatory Assets 722.0 547.6 572.7 Total Regulatory Assets $ 784.7 $ 835.7 $ 685.4 Regulatory Liabilities: Noncurrent: Deferred taxes due to customers $ 121.3 $ 127.9 $ 134.7 Pension and postretirement benefit costs 132.7 143.6 148.3 Accrued cost of removal — — 5.7 Unamortized purchased gas adjustments — 53.0 17.1 Other 22.9 7.3 7.9 Total Noncurrent Regulatory Liabilities 276.9 331.8 313.7 Total Regulatory Liabilities $ 276.9 $ 331.8 $ 313.7 March 31, September 30, March 31, Spire Alabama 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 53.6 $ 43.8 $ 31.0 Other 11.2 13.1 10.0 Total Current Regulatory Assets 64.8 56.9 41.0 Noncurrent: Future income taxes due from customers 2.0 2.2 2.2 Pension and postretirement benefit costs 73.1 66.5 82.0 Cost of removal 492.2 468.5 421.4 Other 1.0 1.0 1.1 Total Noncurrent Regulatory Assets 568.3 538.2 506.7 Total Regulatory Assets $ 633.1 $ 595.1 $ 547.7 Regulatory Liabilities: Noncurrent: Pension and postretirement benefit costs $ 18.0 $ 19.4 $ 21.1 Other 3.5 3.6 3.6 Total Noncurrent Regulatory Liabilities 21.5 23.0 24.7 Total Regulatory Liabilities $ 21.5 $ 23.0 $ 24.7
Schedule of Regulatory Assets Not Earning Return [Table Text Block]	March 31, September 30, March 31, 2023 2022 2022 Spire Pension and postretirement benefit costs $ 127.8 $ 152.9 $ 152.0 Future income taxes due from customers 137.2 135.6 135.7 Unamortized purchased gas adjustments 240.0 275.1 147.7 Other 102.4 122.7 120.2 Total Regulatory Assets Not Earning a Return $ 607.4 $ 686.3 $ 555.6 Spire Missouri Pension and postretirement benefit costs $ 127.8 $ 152.9 $ 152.0 Future income taxes due from customers 130.9 129.2 129.3 Unamortized purchased gas adjustments 240.0 275.1 147.7 Other 102.4 122.7 120.2 Total Regulatory Assets Not Earning a Return $ 601.1 $ 679.9 $ 549.2

Note 6 - Financing (Tables)

Note 6 - Financing (Tables)	6 Months Ended
	Mar. 31, 2023
Notes Tables
Schedule of Short-Term Debt [Table Text Block]	Spire (Parent Only) Spire Missouri Spire Alabama Spire CP Term Spire Spire Consol- Program Loan Note Note idated Six Months Ended March 31, 2023 Highest borrowings outstanding $ 1,282.0 $ 250.0 $ 656.9 $ 274.0 $ 1,482.0 Lowest borrowings outstanding 354.4 — 3.8 76.7 554.4 Weighted average borrowings 922.7 111.0 383.6 134.9 1,033.7 Weighted average interest rate 4.6 % 5.4 % 4.5 % 4.6 % 4.7 % As of March 31, 2023 Borrowings outstanding $ 361.0 $ 200.0 $ 60.7 $ 121.3 $ 561.0 Weighted average interest rate 5.3 % 5.6 % 5.3 % 5.3 % 5.4 % As of September 30, 2022 Borrowings outstanding $ 1,037.5 $ — $ 445.3 $ 260.9 $ 1,037.5 Weighted average interest rate 3.3 % 0.0 % 3.3 % 3.3 % 3.3 % As of March 31, 2022 Borrowings outstanding $ 607.1 $ — $ 277.2 $ 156.6 $ 607.1 Weighted average interest rate 0.9 % 0.0 % 0.9 % 0.9 % 0.9 %
Summary Of Capitalized Interest [Table Text Block]	Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire $ 1.9 $ 1.0 $ 3.5 $ 2.1 Spire Missouri 0.6 0.1 1.1 0.1 Spire Alabama 0.6 0.8 1.3 1.6

Note 7 - Fair Value of Financ_2

Note 7 - Fair Value of Financial Instruments (Tables)	6 Months Ended
	Mar. 31, 2023
Notes Tables
Fair Value, by Balance Sheet Grouping [Table Text Block]	Classification of Estimated Fair Value Carrying Amount Fair Value Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Spire As of March 31, 2023 Cash and cash equivalents $ 6.9 $ 6.9 $ 6.9 $ — Notes payable 561.0 561.0 — 561.0 Long-term debt, including current portion 3,959.1 3,704.2 — 3,704.2 As of September 30, 2022 Cash and cash equivalents $ 6.5 $ 6.5 $ 6.5 $ — Notes payable 1,037.5 1,037.5 — 1,037.5 Long-term debt, including current portion 3,239.7 2,851.8 — 2,851.8 As of March 31, 2022 Cash and cash equivalents $ 8.3 $ 8.3 $ 8.3 $ — Notes payable 607.1 607.1 — 607.1 Long-term debt, including current portion 3,238.5 3,299.1 — 3,299.1 Spire Missouri As of March 31, 2023 Notes payable $ 200.0 $ 200.0 $ — $ 200.0 Notes payable – associated companies 60.7 60.7 — 60.7 Long-term debt, including current portion 2,034.5 1,930.2 — 1,930.2 As of September 30, 2022 Notes payable – associated companies $ 445.3 $ 445.3 $ — $ 445.3 Long-term debt, including current portion 1,637.7 1,473.9 — 1,473.9 As of March 31, 2022 Notes payable – associated companies $ 277.2 $ 277.2 $ — $ 277.2 Long-term debt 1,637.1 1,691.9 — 1,691.9 Spire Alabama As of March 31, 2023 Cash and cash equivalents $ 1.0 $ 1.0 $ 1.0 $ — Notes payable – associated companies 121.3 121.3 — 121.3 Long-term debt 745.7 696.6 — 696.6 As of September 30, 2022 Cash and cash equivalents $ 2.4 $ 2.4 $ 2.4 $ — Notes payable – associated companies 260.9 260.9 — 260.9 Long-term debt 571.5 485.0 — 485.0 As of March 31, 2022 Cash and cash equivalents $ 0.2 $ 0.2 $ 0.2 $ — Notes payable – associated companies 156.6 156.6 — 156.6 Long-term debt 571.4 588.0 — 588.0

Note 8 - Fair Value Measureme_2

Note 8 - Fair Value Measurements (Tables)	6 Months Ended
	Mar. 31, 2023
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of March 31, 2023 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 20.7 $ — $ — $ 20.7 NYMEX/ICE natural gas contracts 0.1 — (0.1 ) — Gas Marketing: NYMEX/ICE natural gas contracts 31.9 — (31.9 ) — Natural gas commodity contracts 39.2 — (1.3 ) 37.9 Other: U.S. stock/bond mutual funds 29.2 — — 29.2 Interest rate swaps 16.5 — — 16.5 Total $ 137.6 $ — $ (33.3 ) $ 104.3 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 62.7 $ — $ (62.7 ) $ — Gasoline and heating oil contracts 0.5 — (0.5 ) — Gas Marketing: NYMEX/ICE natural gas contracts 48.1 — (48.1 ) — Natural gas commodity contracts 32.4 — (1.3 ) 31.1 Other: Interest rate swaps 2.2 — — 2.2 Total $ 145.9 $ — $ (112.6 ) $ 33.3 Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of September 30, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 19.1 $ — $ — $ 19.1 NYMEX/ICE natural gas contracts 57.8 — (57.8 ) — Gas Marketing: NYMEX/ICE natural gas contracts 91.8 — (91.8 ) — Natural gas commodity contracts 56.6 — (4.0 ) 52.6 Other: U.S. stock/bond mutual funds 29.3 — — 29.3 Interest rate swaps 63.6 — — 63.6 Total $ 318.2 $ — $ (153.6 ) $ 164.6 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 30.7 $ — $ (30.7 ) $ — Gas Marketing: NYMEX/ICE natural gas contracts 82.3 — (82.3 ) — Natural gas commodity contracts 65.5 — (4.0 ) 61.5 Total $ 178.5 $ — $ (117.0 ) $ 61.5 As of March 31, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 23.0 $ — $ — $ 23.0 NYMEX/ICE natural gas contracts 58.9 — (58.9 ) — Gas Marketing: NYMEX/ICE natural gas contracts 96.1 — (88.4 ) 7.7 Natural gas commodity contracts 30.8 — (1.0 ) 29.8 Other: U.S. stock/bond mutual funds 24.1 — — 24.1 Interest rate swaps 28.8 — (7.9 ) 20.9 Total $ 261.7 $ — $ (156.2 ) $ 105.5 LIABILITIES Gas Marketing: NYMEX/ICE natural gas contracts $ 40.4 $ — $ (40.4 ) $ — Natural gas commodity contracts 106.2 — (1.0 ) 105.2 Other: Interest rate swaps 7.9 — (7.9 ) — Total $ 154.5 $ — $ (49.3 ) $ 105.2 Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of March 31, 2023 ASSETS U.S. stock/bond mutual funds $ 20.7 $ — $ — $ 20.7 NYMEX/ICE natural gas contracts 0.1 — (0.1 ) — Total $ 20.8 $ — $ (0.1 ) $ 20.7 LIABILITIES NYMEX/ICE natural gas contracts $ 62.7 $ — $ (62.7 ) $ — Gasoline and heating oil contracts 0.5 — (0.5 ) — Total $ 63.2 $ — $ (63.2 ) $ — As of September 30, 2022 ASSETS U.S. stock/bond mutual funds $ 19.1 $ — $ — $ 19.1 NYMEX/ICE natural gas contracts 57.8 — (57.8 ) — Total $ 76.9 $ — $ (57.8 ) $ 19.1 LIABILITIES NYMEX/ICE natural gas contracts $ 30.7 $ — $ (30.7 ) $ — As of March 31, 2022 ASSETS U.S. stock/bond mutual funds $ 23.0 $ — $ — $ 23.0 NYMEX/ICE natural gas contracts 58.9 — (58.9 ) — Total $ 81.9 $ — $ (58.9 ) $ 23.0

Note 9 - Pension Plans and Ot_2

Note 9 - Pension Plans and Other Postretirement Benefits (Tables)	6 Months Ended
	Mar. 31, 2023
Notes Tables
Schedule of Net Benefit Costs [Table Text Block]	Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire Service cost – benefits earned during the period $ 3.9 $ 5.4 $ 8.0 $ 10.8 Interest cost on projected benefit obligation 5.9 5.3 12.3 10.4 Expected return on plan assets (5.7 ) (8.2 ) (12.1 ) (16.4 ) Amortization of prior service credit (1.2 ) (1.2 ) (2.3 ) (2.3 ) Amortization of actuarial loss 1.6 3.6 3.2 7.3 Loss on lump-sum settlements — 11.7 8.6 11.7 Subtotal 4.5 16.6 17.7 21.5 Regulatory adjustment 10.4 (1.2 ) 12.2 9.4 Net pension cost $ 14.9 $ 15.4 $ 29.9 $ 30.9 Spire Missouri Service cost – benefits earned during the period $ 2.9 $ 3.8 $ 5.7 $ 7.7 Interest cost on projected benefit obligation 4.4 3.6 8.9 7.1 Expected return on plan assets (4.5 ) (5.9 ) (9.0 ) (11.9 ) Amortization of prior service credit (0.5 ) (0.5 ) (1.0 ) (1.0 ) Amortization of actuarial loss 1.6 2.8 3.1 5.6 Loss on lump-sum settlements — 6.8 — 6.8 Subtotal 3.9 10.6 7.7 14.3 Regulatory adjustment 8.1 1.1 16.2 9.6 Net pension cost $ 12.0 $ 11.7 $ 23.9 $ 23.9 Spire Alabama Service cost – benefits earned during the period $ 0.8 $ 1.3 $ 1.9 $ 2.7 Interest cost on projected benefit obligation 0.8 1.2 2.1 2.3 Expected return on plan assets (0.5 ) (1.4 ) (1.6 ) (2.8 ) Amortization of prior service credit (0.6 ) (0.6 ) (1.2 ) (1.2 ) Amortization of actuarial loss 0.2 0.8 0.3 1.7 Loss on lump-sum settlements — 4.9 8.6 4.9 Subtotal 0.7 6.2 10.1 7.6 Regulatory adjustment 2.1 (2.5 ) (4.4 ) (0.6 ) Net pension cost $ 2.8 $ 3.7 $ 5.7 $ 7.0 Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Spire Service cost – benefits earned during the period $ 1.2 $ 2.0 $ 2.4 $ 3.9 Interest cost on accumulated postretirement benefit obligation 2.2 1.5 4.3 3.0 Expected return on plan assets (3.9 ) (4.3 ) (7.8 ) (8.5 ) Amortization of prior service cost — 0.2 0.1 0.5 Amortization of actuarial gain (1.1 ) (0.6 ) (2.1 ) (1.2 ) Subtotal (1.6 ) (1.2 ) (3.1 ) (2.3 ) Regulatory adjustment 0.2 0.1 0.3 3.3 Net postretirement benefit (income) cost $ (1.4 ) $ (1.1 ) $ (2.8 ) $ 1.0 Spire Missouri Service cost – benefits earned during the period $ 1.0 $ 1.6 $ 2.0 $ 3.2 Interest cost on accumulated postretirement benefit obligation 1.7 1.1 3.3 2.2 Expected return on plan assets (2.7 ) (2.9 ) (5.3 ) (5.7 ) Amortization of prior service cost 0.1 0.2 0.3 0.4 Amortization of actuarial gain (0.8 ) (0.5 ) (1.6 ) (1.0 ) Subtotal (0.7 ) (0.5 ) (1.3 ) (0.9 ) Regulatory adjustment 0.7 0.5 1.3 4.1 Net postretirement benefit cost $ — $ — $ — $ 3.2 Spire Alabama Service cost – benefits earned during the period $ 0.1 $ 0.3 $ 0.3 $ 0.6 Interest cost on accumulated postretirement benefit obligation 0.5 0.3 0.9 0.7 Expected return on plan assets (1.3 ) (1.3 ) (2.5 ) (2.6 ) Amortization of prior service (credit) cost (0.1 ) — (0.2 ) 0.1 Amortization of actuarial gain (0.2 ) — (0.3 ) — Subtotal (1.0 ) (0.7 ) (1.8 ) (1.2 ) Regulatory adjustment (0.4 ) (0.4 ) (0.9 ) (0.9 ) Net postretirement benefit income $ (1.4 ) $ (1.1 ) $ (2.7 ) $ (2.1 )

Note 10 - Information by Oper_2

Note 10 - Information by Operating Segment (Tables)	6 Months Ended
	Mar. 31, 2023
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended March 31, 2023 Operating Revenues: Revenues from external customers $ 1,054.4 $ 60.6 $ 8.2 $ 0.2 $ — $ 1,123.4 Intersegment revenues 0.1 — 8.3 3.9 (12.3 ) — Total Operating Revenues 1,054.5 60.6 16.5 4.1 (12.3 ) 1,123.4 Operating Expenses: Natural gas 543.3 51.5 — — (8.3 ) 586.5 Operation and maintenance 119.3 5.7 6.2 4.9 (4.0 ) 132.1 Depreciation and amortization 60.2 0.4 2.0 — — 62.6 Taxes, other than income taxes 80.4 0.6 0.8 0.1 — 81.9 Total Operating Expenses 803.2 58.2 9.0 5.0 (12.3 ) 863.1 Operating Income (Loss) $ 251.3 $ 2.4 $ 7.5 $ (0.9 ) $ — $ 260.3 Net Economic Earnings (Loss) $ 183.9 $ 21.8 $ 4.2 $ (10.7 ) $ — $ 199.2 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended March 31, 2022 Operating Revenues: Revenues from external customers $ 817.4 $ 59.4 $ 4.0 $ 0.1 $ — $ 880.9 Intersegment revenues — — 9.8 4.2 (14.0 ) — Total Operating Revenues 817.4 59.4 13.8 4.3 (14.0 ) 880.9 Operating Expenses: Natural gas 356.0 45.8 — — (9.8 ) 392.0 Operation and maintenance 104.2 3.2 5.8 4.2 (4.2 ) 113.2 Depreciation and amortization 56.5 0.4 1.9 0.1 — 58.9 Taxes, other than income taxes 70.3 0.4 0.9 — — 71.6 Total Operating Expenses 587.0 49.8 8.6 4.3 (14.0 ) 635.7 Operating Income $ 230.4 $ 9.6 $ 5.2 $ — $ — $ 245.2 Net Economic Earnings (Loss) $ 169.2 $ 14.4 $ 3.0 $ (5.6 ) $ — $ 181.0 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Six Months Ended March 31, 2022 Operating Revenues: Revenues from external customers $ 1,320.9 $ 107.3 $ 7.8 $ 0.3 $ — $ 1,436.3 Intersegment revenues — — 18.9 7.7 (26.6 ) — Total Operating Revenues 1,320.9 107.3 26.7 8.0 (26.6 ) 1,436.3 Operating Expenses: Natural gas 566.2 93.8 — — (18.8 ) 641.2 Operation and maintenance 211.5 5.9 11.6 8.4 (7.8 ) 229.6 Depreciation and amortization 111.1 0.7 3.8 0.2 — 115.8 Taxes, other than income taxes 107.3 0.4 1.5 — — 109.2 Total Operating Expenses 996.1 100.8 16.9 8.6 (26.6 ) 1,095.8 Operating Income (Loss) $ 324.8 $ 6.5 $ 9.8 $ (0.6 ) $ — $ 340.5 Net Economic Earnings (Loss) $ 236.4 $ 14.9 $ 5.5 $ (13.2 ) $ — $ 243.6
Reconciliation Of Consolidated Net Economic Earnings To Consolidated Net Income [Table Text Block]	Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Six Months Ended March 31, 2023 Operating Revenues: Revenues from external customers $ 1,787.4 $ 134.7 $ 15.0 $ 0.3 $ — $ 1,937.4 Intersegment revenues 0.1 — 16.7 7.8 (24.6 ) — Total Operating Revenues 1,787.5 134.7 31.7 8.1 (24.6 ) 1,937.4 Operating Expenses: Natural gas 944.9 77.5 — — (16.7 ) 1,005.7 Operation and maintenance 239.2 12.0 12.0 8.9 (7.9 ) 264.2 Depreciation and amortization 119.9 0.7 3.9 0.2 — 124.7 Taxes, other than income taxes 130.3 0.7 1.2 0.1 — 132.3 Total Operating Expenses 1,434.3 90.9 17.1 9.2 (24.6 ) 1,526.9 Operating Income (Loss) $ 353.2 $ 43.8 $ 14.6 $ (1.1 ) $ — $ 410.5 Net Economic Earnings (Loss) $ 246.8 $ 47.5 $ 8.0 $ (18.0 ) $ — $ 284.3 Three Months Ended March 31, Six Months Ended March 31, 2023 2022 2023 2022 Net Income $ 179.2 $ 173.6 $ 270.2 $ 229.3 Adjustments, pre-tax: Fair value and timing adjustments 26.6 9.9 18.8 13.6 Income tax adjustments (6.6 ) (2.5 ) (4.7 ) 0.7 Net Economic Earnings $ 199.2 $ 181.0 $ 284.3 $ 243.6
Reconciliation of Assets from Segment to Consolidated [Table Text Block]	March 31, September 30, March 31, 2023 2022 2022 Total Assets: Gas Utility $ 8,317.6 $ 8,042.8 $ 7,684.1 Gas Marketing 335.0 638.7 431.1 Midstream 506.2 446.0 420.3 Other 1,959.1 2,449.2 2,123.5 Eliminations (1,068.9 ) (1,493.0 ) (1,257.7 ) Total Assets $ 10,049.0 $ 10,083.7 $ 9,401.3

Note 1 - Summary of Significa_3

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Restricted Cash	$ 14.3	$ 14.3	$ 6.9	$ 14
Payments to Acquire Businesses, Gross	$ 37.1	$ 37.1	$ 0

Note 1 - Summary of Significa_4

Note 1 - Summary of Significant Accounting Policies - Transactions with Affiliates (Details) - Affiliated Entity [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Regulated Operation [Member] | Spire Marketing [Member] | Spire Missouri [Member]
Purchases of natural gas from Spire Marketing	$ 13.8	$ 17.9	$ 42.3	$ 36.1
Regulated Operation [Member] | Spire Marketing [Member] | Spire Missouri [Member] | Related Party [Member]
Transportation services received from Spire STL Pipeline	0.1	0	0.1	0
Regulated Operation [Member] | Spire Marketing [Member] | Spire Alabama Inc [Member]
Purchases of natural gas from Spire Marketing	0	0	1.1	0
Unregulated Operation [Member] | Spire S T L Pipeline L L C [Member] | Spire Missouri [Member] | Related Party [Member]
Transportation services received from Spire STL Pipeline	$ 7.8	$ 7.8	$ 15.9	$ 15.9

Note 1 - Summary of Significa_5

Note 1 - Summary of Significant Accounting Policies - Accrued Capital Expenditures Excluded from Capital Expenditures in the Statements of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Accrued capital expenditures	$ 66.3	$ 38.8	$ 77.8
Spire Missouri [Member]
Accrued capital expenditures	35.4	28.7	45.6
Spire Alabama Inc [Member]
Accrued capital expenditures	$ 5.2	$ 5	$ 19.2

Note 1 - Summary of Significa_6

Note 1 - Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Allowance at beginning of period	$ 34.5	$ 31.4	$ 31.9	$ 30.3
Provision for expected credit losses	8.2	5.2	12.3	6.7
Write-offs, net of recoveries	(2.1)	(1.5)	(3.6)	(1.9)
Allowance at end of period	40.6	35.1	40.6	35.1
Spire Missouri [Member]
Allowance at beginning of period	28.2	23.8	24.9	22.6
Provision for expected credit losses	7.3	4.7	11.1	6.8
Write-offs, net of recoveries	(1)	(1.5)	(1.5)	(2.4)
Allowance at end of period	34.5	27	34.5	27
Spire Alabama Inc [Member]
Allowance at beginning of period	5.5	6.7	6.3	6.6
Provision for expected credit losses	0.5	0.5	0.7	0
Write-offs, net of recoveries	(0.7)	(0.1)	(1.7)	0.5
Allowance at end of period	$ 5.3	$ 7.1	$ 5.3	$ 7.1

Note 2 - Revenue - Disaggregate

Note 2 - Revenue - Disaggregated of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Operating Revenues	$ 1,123.4	$ 880.9	$ 1,937.4	$ 1,436.3
Operating Segments [Member]
Operating Revenues			24.6
Consolidation, Eliminations [Member]
Operating Revenues	(12.3)	(14)		(26.6)
Gas Utility [Member] | Operating Segments [Member]
Operating Revenues	1,054.5	817.4	1,787.5	1,320.9
Gas Marketing [Member] | Operating Segments [Member]
Operating Revenues	60.6	59.4	134.7	107.3
Midstream [Member] | Operating Segments [Member]
Operating Revenues	16.5	13.8	31.7	26.7
Other Segments [Member]
Operating Revenues	4.1	4.3	8.1	8
Spire Missouri [Member]
Operating Revenues	791	571.2	1,332.2	919.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	773.9	574	1,313.6	905.3
Changes in accrued revenue under alternative revenue programs	17.1	(2.8)	18.6	13.8
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	570	529.1	970.6	776.2
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	185.2	19.9	308.1	88.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	9.9	10.1	19	19.3
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	4.5	11.3	9.6	15.8
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	4.3	3.6	6.3	5.9
Spire Alabama Inc [Member]
Operating Revenues	218.3	204.1	370.7	330.7
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	219.8	204.7	372.6	331.4
Changes in accrued revenue under alternative revenue programs	(1.5)	(0.6)	(1.9)	(0.7)
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	135.1	129.9	231.4	210
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	61.5	51.6	95.1	77.6
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	20.8	20.7	40.1	40.1
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	1.7	0.6	4.1	1
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	0.7	1.9	1.9	2.7
Spire [Member]
Operating Revenues	1,123.4	880.9	1,937.4	1,436.3
Spire [Member] | Operating Segments [Member]
Operating Revenues	1,135.7	894.9	1,962	1,462.9
Spire [Member] | Consolidation, Eliminations [Member]
Operating Revenues	(12.3)	(14)	(24.6)	(26.6)
Spire [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	1,034.2	824.9	1,765.7	1,310.3
Changes in accrued revenue under alternative revenue programs	20.3	(7.5)	21.8	10.6
Total Gas Utility operating revenues	1,054.5	817.4	1,787.5	1,320.9
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	730.2	687.3	1,248.2	1,029.3
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	260.3	85.6	430.9	189.4
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	33.3	33.5	64.2	64.7
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	6.1	12	13.7	16.8
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	4.3	6.5	8.7	10.1
Spire [Member] | Gas Marketing [Member] | Operating Segments [Member]
Unregulated Operating Revenue	60.6	59.4	134.7	107.3
Spire [Member] | Midstream [Member] | Operating Segments [Member]
Unregulated Operating Revenue	16.5	13.8	31.7	26.7
Spire [Member] | Other Segments [Member] | Operating Segments [Member]
Unregulated Operating Revenue	$ 4.1	$ 4.3	$ 8.1	$ 8

Note 2 - Revenue - Taxes Associ

Note 2 - Revenue - Taxes Associated with Natural Gas Utility Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Gross Receipts Tax Amounts	$ 60.2	$ 51.9	$ 90.6	$ 73.8
Spire Missouri [Member]
Gross Receipts Tax Amounts	45.6	39	67.7	53.9
Spire Alabama Inc [Member]
Gross Receipts Tax Amounts	$ 12.6	$ 11.3	$ 19.4	$ 17

Note 3 - Earnings Per Common _3

Note 3 - Earnings Per Common Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Net Income		$ 179.2	$ 173.6	$ 270.2	$ 229.3
Provision for preferred dividends		3.7	3.7	7.4	7.4
Income allocated to participating securities		0.4	0.2	0.5	0.3
Income Available to Common Shareholders		$ 175.1	$ 169.7	$ 262.3	$ 221.6
Basic (in shares)		52.5	51.8	52.5	51.7
Basic Earnings Per Common Share (in dollars per share)		$ 3.33	$ 3.27	$ 5	$ 4.28
Dilutive Effect of forward sales of common stock, restricted stock and restricted stock units (in millions)* (in shares)	[1]	0.1	0.1	0.1	0.1
Weighted Average Diluted Common Shares (in millions) (in shares)		52.6	51.9	52.6	51.8
Diluted Earnings Per Common Share (in dollars per share)		$ 3.33	$ 3.27	$ 4.99	$ 4.28
* Calculation excludes certain outstanding or potential common shares (shown in millions by period at the right) attributable to (1) forward sales of common stock, (2) stock units subject to performance or market conditions, and (3) restricted stock, which could have a dilutive effect in the future (in shares)		0.5	0.2	0.4	0.2
[1]Calculation excludes certain outstanding or potential common shares (shown in millions by period at the right) attributable to (1) forward sales of common stock, (2) stock units subject to performance or market conditions, and (3) restricted stock, which could have a dilutive effect in the future

Note 4 - Shareholders' Equity (

Note 4 - Shareholders' Equity (Details Textual) - At The Market Program [Member] - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Apr. 28, 2022
Number of Shares Authorized for Issuance (in shares)		152,800,000	200,000,000
Forward Sales Agreements, Proceeds If Settled		$ 16
Subsequent Event [Member]
Forward Sales Agreements, Shares (in shares)	228,690

Note 5 - Regulatory Matters (De

Note 5 - Regulatory Matters (Details Textual) - USD ($)

1 Months Ended

3 Months Ended

6 Months Ended

Apr. 23, 2023

Jan. 01, 2023

Nov. 18, 2022

Sep. 14, 2022

Dec. 23, 2021

Oct. 31, 2022

Feb. 28, 2021

Mar. 31, 2023

Mar. 31, 2022

Mar. 31, 2023

Mar. 31, 2022

Apr. 28, 2023

Jan. 25, 2023

Sep. 30, 2022

Utilities Operating Expense, Gas and Petroleum Purchased

$ 586,500,000

$ 392,000,000

$ 1,005,700,000

$ 641,200,000

Missouri Public Service Commission [Member] | Infrastructure System Replacement Surcharge [Member]

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 47,300,000

Spire Missouri [Member]

Utilities Operating Expense, Gas and Petroleum Purchased

$ 195,800,000

465,700,000

287,800,000

782,400,000

444,100,000

Public Utilities, Reduced Revenue Accounts Receivable Cost Of Gas and Regulatory Liabilities

150,000,000

Utilities Operating, Due From Other Parties

42,000,000

42,000,000

Spire Missouri [Member] | Missouri Public Service Commission [Member]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 78,000,000

72,200,000

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 24,900,000

Public Utilities, Deferred Amount Under Order Authorizing Accounting Treatment

$ 42.8

Public Utilities, Disallowance From ACA Balance

$ 600,000

Spire Missouri [Member] | Missouri Public Service Commission [Member] | Subsequent Event [Member]

Public Utilities, Disallowance From ACA Balance Filed

$ 27,700,000

Spire Missouri [Member] | Missouri Public Service Commission [Member] | Maximum [Member] | Subsequent Event [Member]

Regulated Operating Revenue, Pipelines

$ 7.7

Spire Missouri [Member] | Missouri Public Service Commission [Member] | Infrastructure System Replacement Surcharge [Member]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 19,000,000

Spire Alabama Inc [Member]

Utilities Operating Expense, Gas and Petroleum Purchased

$ 61,800,000

$ 52,100,000

$ 131,200,000

$ 97,600,000

Spire Alabama Inc [Member] | Alabama Public Service Commission [Member]

Annual Revenue Increase From Rates, Amount

$ 15,000,000

Spire Gulf [Member]

Public Utilities, Approved Return on Equity, Percentage

9.95%

Public Utilities, Approved Rate, Increase Decrease Annualized Revenue

$ 2,500,000

Spire Mississippi [Member]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 1,300,000

Public Utilities, Approved Rate, Increase Decrease Annualized Revenue

$ 800,000

Future Income Taxes Due From Customers and Pension and Other Postretirement Benefit Costs [Member]

Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)

20 years

20 years

PGA Assets Not Earning A Return [Member]

Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)

15 years

15 years

Note 5 - Regulatory Matters - R

Note 5 - Regulatory Matters - Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022
Regulatory assets	$ 143	$ 355.4	$ 164
Regulatory Assets Noncurrent	1,316.7	1,112.4	1,106.8
Total Regulatory Assets	1,459.7	1,467.8	1,270.8
Regulatory Liability Current	5.3	3.7	3.2
Regulatory Liability Noncurrent	360.3	418.2	400.4
Total Regulatory Liabilities	365.6	421.9	403.6
Spire Missouri [Member]
Regulatory assets	62.7	288.1	112.7
Regulatory Assets Noncurrent	722	547.6	572.7
Total Regulatory Assets	784.7	835.7	685.4
Regulatory Liability Noncurrent	276.9	331.8	313.7
Total Regulatory Liabilities	276.9	331.8	313.7
Spire Alabama Inc [Member]
Regulatory assets	64.8	56.9	41
Regulatory Assets Noncurrent	568.3	538.2	506.7
Total Regulatory Assets	633.1	595.1	547.7
Regulatory Liability Noncurrent	21.5	23	24.7
Total Regulatory Liabilities	21.5	23	24.7
Unamortized Purchased Gas Adjustments Asset [Member]
Regulatory assets	115.3	322.2	146.6
Regulatory Assets Noncurrent	181.3	0	35.2
Regulatory Liability Current	0	53	17.1
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Missouri [Member]
Regulatory assets	58.7	275.1	112.5
Regulatory Assets Noncurrent	181.3	0	35.2
Regulatory Liability Current	0	53	17.1
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Alabama Inc [Member]
Regulatory assets	53.6	43.8	31
Other Regulatory Assets (Liabilities) [Member]
Regulatory assets	27.7	33.2	17.4
Regulatory Assets Noncurrent	147.2	129.2	109.4
Regulatory Liability Current	5.3	3.7	3.2
Regulatory Liability Noncurrent	28.9	14.4	13.5
Other Regulatory Assets (Liabilities) [Member] | Spire Missouri [Member]
Regulatory assets	4	13	0.2
Regulatory Assets Noncurrent	130.7	113.1	92.7
Regulatory Liability Current	22.9	7.3	7.9
Other Regulatory Assets (Liabilities) [Member] | Spire Alabama Inc [Member]
Regulatory assets	11.2	13.1	10
Regulatory Assets Noncurrent	1	1	1.1
Regulatory Liability Current	3.5	3.6	3.6
Pension and Other Postretirement Plans Costs [Member]
Regulatory assets	273.1	294.5	314.8
Regulatory Assets Noncurrent	161	172.6	179.4
Pension and Other Postretirement Plans Costs [Member] | Spire Missouri [Member]
Regulatory assets	195.5	222.9	227.5
Regulatory Assets Noncurrent	132.7	143.6	148.3
Pension and Other Postretirement Plans Costs [Member] | Spire Alabama Inc [Member]
Regulatory assets	73.1	66.5	82
Regulatory Assets Noncurrent	18	19.4	21.1
Deferred Income Tax Charge [Member]
Regulatory Assets Noncurrent	139.3	137.8	138
Deferred Income Tax Charge [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	130.9	129.2	129.3
Deferred Income Tax Charge [Member] | Spire Alabama Inc [Member]
Regulatory Assets Noncurrent	2	2.2	2.2
Removal Costs [Member]
Regulatory Assets Noncurrent	516.4	493.7	456.3
Regulatory Liability Noncurrent	34.6	32.9	38.3
Removal Costs [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	24.2	25.2	34.9
Regulatory Liability Noncurrent	0	0	5.7
Removal Costs [Member] | Spire Alabama Inc [Member]
Regulatory Assets Noncurrent	492.2	468.5	421.4
Renewable Energy Program [Member]
Regulatory Assets Noncurrent	59.4	57.2	53.1
Renewable Energy Program [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	59.4	57.2	53.1
Estimated Deferred Taxes Due to Customers [Member]
Regulatory Liability Noncurrent	135.8	145.3	152.1
Estimated Deferred Taxes Due to Customers [Member] | Spire Missouri [Member]
Regulatory Liability Noncurrent	$ 121.3	$ 127.9	$ 134.7

Note 5 - Regulatory Matters -_2

Note 5 - Regulatory Matters - Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022
Regulatory assets not earning a return	$ 607.4	$ 686.3	$ 555.6
Spire Missouri [Member]
Regulatory assets not earning a return	601.1	679.9	549.2
Pension and Other Postretirement Plans Costs [Member]
Regulatory assets not earning a return	127.8	152.9	152
Pension and Other Postretirement Plans Costs [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	127.8	152.9	152
Deferred Income Tax Charge [Member]
Regulatory assets not earning a return	137.2	135.6	135.7
Deferred Income Tax Charge [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	130.9	129.2	129.3
Unamortized Purchased Gas Adjustments Asset [Member]
Regulatory assets not earning a return	240	275.1	147.7
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	240	275.1	147.7
Other Regulatory Assets (Liabilities) [Member]
Regulatory assets not earning a return	102.4	122.7	120.2
Other Regulatory Assets (Liabilities) [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	$ 102.4	$ 122.7	$ 120.2

Note 6 - Financing (Details Tex

Note 6 - Financing (Details Textual) - USD ($)		1 Months Ended	3 Months Ended
	Jan. 05, 2023	Mar. 31, 2021	Mar. 31, 2023	Mar. 07, 2023	Feb. 13, 2023	Dec. 31, 2022	Oct. 13, 2022	Jul. 22, 2022
Interest Rate Swap [Member]
Derivative, Notional Amount, Settled			$ 325,000,000
Derivative, Gain (Loss) on Derivative, Net			39,500,000
Commercial Paper [Member]
Short-term Borrowing, Maximum Aggregate Principal Amount								$ 1,300,000,000
Commercial Paper [Member] | Parent Company [Member]
Short Term Borrowings Used to Support Lending to Utilities			$ 224.2
Spire [Member] | Notes Due March 15 2033 [Member]
Debt Instrument, Interest Rate, Stated Percentage				5.80%
Long-Term Debt, Gross				$ 150,000,000
Spire Missouri [Member] | First Mortgage Bond Due 2033 [Member]
Debt Instrument, Interest Rate, Stated Percentage					4.80%
Long-Term Debt, Gross					$ 400,000,000
Spire Missouri [Member] | Unsecured Term Loan [Member]
Debt Instrument, Face Amount	$ 250,000,000	$ 250,000,000
Debt Instrument, Term (Day)		364 days
Debt Instrument, Interest Rate, Stated Percentage	0.10%
Spire Missouri [Member] | Unsecured Term Loan [Member] | London Interbank Offered Rate LIBOR 1 [Member]
Line of Credit Facility, Covenant, Percentage of Total Capitalization						65%
Debt Instrument, Basis Spread on Variable Rate	0.80%	0.65%
Spire Gulf [Member] | Notes Due October 15, 2029 [Member]
Debt Instrument, Interest Rate, Stated Percentage							5.32%
Long-Term Debt, Gross							$ 90,000,000
Spire Gulf [Member] | Notes Due October 15, 2032 [Member]
Debt Instrument, Interest Rate, Stated Percentage							5.41%
Long-Term Debt, Gross							$ 85,000,000
Spire Gulf [Member] | First Mortgage Bonds Due October 15, 2037 [Member]
Debt Instrument, Interest Rate, Stated Percentage							5.61%
Long-Term Debt, Gross							$ 30,000,000
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity								1,300,000,000
Long-Term Line of Credit, Total						$ 0
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility, Covenant, Percentage of Total Capitalization						70%
Revolving Credit Facility [Member] | Spire [Member]
Line of Credit Facility, Maximum Borrowing Capacity								450,000,000
Revolving Credit Facility [Member] | Spire Missouri [Member]
Line of Credit Facility, Maximum Borrowing Capacity								575,000,000
Revolving Credit Facility [Member] | Spire Alabama Inc [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 275,000,000

Note 6 - Financing - Short-term

Note 6 - Financing - Short-term Borrowings (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022
Highest borrowings outstanding	$ 1,482
Lowest borrowings outstanding	554.4
Weighted average borrowings	$ 1,033.7
Weighted average interest rate	4.70%
Borrowings outstanding	$ 561	$ 1,037.5	$ 607.1
Weighted average interest rate	5.40%	3.30%	0.90%
Spire Missouri [Member] | Term Loan [Member]
Highest borrowings outstanding	$ 250
Lowest borrowings outstanding	0
Weighted average borrowings	$ 111
Weighted average interest rate	5.40%
Borrowings outstanding	$ 200	$ 0	$ 0
Weighted average interest rate	5.60%	0%	0%
Spire Missouri [Member] | Spire Note [Member]
Highest borrowings outstanding	$ 656.9
Lowest borrowings outstanding	3.8
Weighted average borrowings	$ 383.6
Weighted average interest rate	4.50%
Borrowings outstanding	$ 60.7	$ 445.3	$ 277.2
Weighted average interest rate	5.30%	3.30%	0.90%
Spire Alabama Inc [Member] | Spire Note [Member]
Highest borrowings outstanding	$ 274
Lowest borrowings outstanding	76.7
Weighted average borrowings	$ 134.9
Weighted average interest rate	4.60%
Borrowings outstanding	$ 121.3	$ 260.9	$ 156.6
Weighted average interest rate	5.30%	3.30%	0.90%
Commercial Paper [Member] | Parent Company [Member]
Highest borrowings outstanding	$ 1,282
Lowest borrowings outstanding	354.4
Weighted average borrowings	$ 922.7
Weighted average interest rate	4.60%
Borrowings outstanding	$ 361	$ 1,037.5	$ 607.1
Weighted average interest rate	5.30%	3.30%	0.90%

Note 6 - Financing - Capitalize

Note 6 - Financing - Capitalized Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Interest Paid Capitalized	$ 1.9	$ 1	$ 3.5	$ 2.1
Spire Missouri [Member]
Interest Paid Capitalized	0.6	0.1	1.1	0.1
Spire Alabama Inc [Member]
Interest Paid Capitalized	$ 0.6	$ 0.8	$ 1.3	$ 1.6

Note 7 - Fair Value of Financ_3

Note 7 - Fair Value of Financial Instruments - Estimated Fair Value of Financial Instruments Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022
Reported Value Measurement [Member]
Cash and cash equivalents	$ 6.9	$ 6.5	$ 8.3
Notes payable	561	1,037.5	607.1
Long-term debt, including current portion	3,959.1	3,239.7	3,238.5
Reported Value Measurement [Member] | Spire Missouri [Member]
Notes payable	200
Long-term debt, including current portion	2,034.5	1,637.7	1,637.1
Notes payable – associated companies	60.7	445.3	277.2
Reported Value Measurement [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	1	2.4
Long-term debt, including current portion	745.7	571.5	571.4
Notes payable – associated companies	121.3	260.9	156.6
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	6.9	6.5	8.3
Notes payable	561	1,037.5	607.1
Long-term debt, including current portion	3,704.2	2,851.8	3,299.1
Estimate of Fair Value Measurement [Member] | Spire Missouri [Member]
Notes payable	200
Long-term debt, including current portion	1,930.2	1,473.9	1,691.9
Notes payable – associated companies	60.7	445.3	277.2
Estimate of Fair Value Measurement [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	1	2.4	0.2
Long-term debt, including current portion	696.6	485	588
Notes payable – associated companies	121.3	260.9	156.6
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	6.9	6.5	8.3
Notes payable	0	0	0
Long-term debt, including current portion	0	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Notes payable	0
Long-term debt, including current portion	0	0	0
Notes payable – associated companies	0	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	1	2.4	0.2
Long-term debt, including current portion	0	0	0
Notes payable – associated companies	0	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0	0
Notes payable	561	1,037.5	607.1
Long-term debt, including current portion	3,704.2	2,851.8	3,299.1
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Notes payable	200
Long-term debt, including current portion	1,930.2	1,473.9	1,691.9
Notes payable – associated companies	60.7	445.3	277.2
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	0	0	0
Long-term debt, including current portion	696.6	485	588
Notes payable – associated companies	$ 121.3	$ 260.9	$ 156.6

Note 8 - Fair Value Measureme_3

Note 8 - Fair Value Measurements - Schedule of Derivative Assets and Liabilities, Including Receivables and Payables (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022
Gasoline And Heating Oil Contracts [Member] | Parent Company [Member] | Term Loan [Member]
Derivative Asset Fair Value Gross Asset	$ 0
Gasoline And Heating Oil Contracts [Member] | Commercial Paper [Member] | Parent Company [Member]
Derivative Asset Fair Value Gross Asset	0.5
Spire Missouri [Member] | Gasoline And Heating Oil Contracts [Member] | Term Loan [Member]
Effects of netting, asset	(0.5)
Spire Missouri [Member] | Gasoline And Heating Oil Contracts [Member] | Spire Note [Member]
Derivative Assets	0
Fair Value, Recurring [Member]
Effects of netting, asset	(33.3)	$ (153.6)	$ (156.2)
Derivative Assets	104.3	164.6	105.5
Effects of netting, liability	(112.6)	(117)	(49.3)
Derivative Liabilities	33.3	61.5	105.2
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	137.6	318.2	261.7
Derivative Liability Fair Value Gross Liability	145.9	178.5	154.5
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0	0	0
Fair Value, Recurring [Member] | Spire Missouri [Member]
Effects of netting, asset	(0.1)	(57.8)	(58.9)
Derivative Assets	20.7	19.1	23
Effects of netting, liability	(63.2)
Derivative Liabilities	0
Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	20.8	76.9	81.9
Derivative Liability Fair Value Gross Liability	63.2
Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Gas Utility [Member]
Effects of netting, asset	0	0	0
Derivative Assets	20.7	19.1	23
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Other Segments [Member]
Effects of netting, asset	0	0	0
Derivative Assets	29.2	29.3	24.1
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	20.7	19.1	23
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	29.2	29.3	24.1
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member]
Effects of netting, asset	0	0	0
Derivative Assets	20.7	19.1	23
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	20.7	19.1	23
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Gas Utility [Member]
Effects of netting, asset	(0.1)	(57.8)	(58.9)
Derivative Assets	0	0	0
Effects of netting, liability	(62.7)	(30.7)	(40.4)
Derivative Liabilities	0	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Gas Marketing [Member]
Effects of netting, asset	(31.9)	(91.8)	(88.4)
Derivative Assets	0	0	7.7
Effects of netting, liability	(48.1)	(82.3)
Derivative Liabilities	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.1	57.8	58.9
Derivative Liability Fair Value Gross Liability	62.7	30.7	40.4
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	31.9	91.8	96.1
Derivative Liability Fair Value Gross Liability	48.1	82.3
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member]
Effects of netting, asset	(0.1)	(57.8)	(58.9)
Derivative Assets	0	0	0
Effects of netting, liability	(62.7)	(30.7)
Derivative Liabilities	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	0.1	57.8	58.9
Derivative Liability Fair Value Gross Liability	62.7	30.7
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0	0
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Gas Marketing [Member]
Effects of netting, asset	(1.3)	(4)	(1)
Derivative Assets	37.9	52.6	29.8
Effects of netting, liability	(1.3)	(4)	(1)
Derivative Liabilities	31.1	61.5	105.2
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	39.2	56.6	30.8
Derivative Liability Fair Value Gross Liability	32.4	65.5	106.2
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0	0	0
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member]
Effects of netting, asset	(0.5)
Derivative Assets	0
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	0.5
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0
Interest Rate Swap [Member] | Fair Value, Recurring [Member]
Effects of netting, asset			(7.9)
Derivative Assets			20.9
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Other Segments [Member]
Effects of netting, asset	0	0
Derivative Assets	16.5	63.6
Effects of netting, liability	0		(7.9)
Derivative Liabilities	2.2		0
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset			28.8
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	16.5	63.6
Derivative Liability Fair Value Gross Liability	2.2		7.9
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset			0
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0	$ 0
Derivative Liability Fair Value Gross Liability	$ 0		$ 0

Note 9 - Pension Plans and Ot_3

Note 9 - Pension Plans and Other Postretirement Benefits (Details Textual) - USD ($)			3 Months Ended			6 Months Ended		9 Months Ended
	Dec. 23, 2021	Dec. 22, 2021	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement				$ 0	$ 0
Regulatory Asset, Total			$ 1,459,700,000		1,270,800,000	$ 1,459,700,000	$ 1,270,800,000		$ 1,467,800,000
Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			0		(11,700,000)	(8,600,000)	(11,700,000)
Spire Alabama Inc [Member]
Regulatory Asset, Total			633,100,000		547,700,000	633,100,000	547,700,000		$ 595,100,000
Spire Alabama Inc [Member] | Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement				27,500,000			17,400,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			0	$ (8,600,000)	$ (4,900,000)	(8,600,000)	$ (4,900,000)
Defined Benefit Plan, Plan Assets, Contributions by Employer						13,000,000
Anticipated Contributions to Pension Plans Qualified Trusts						$ 21,300,000
Spire Alabama Inc [Member] | Pension Plan One [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate					3.60%		3.60%			3%
Defined Benefit Plan, Benefit Obligation, Settlement Losses Amortized Over Remaining Actuarial Life (Year)				13 years 4 months 24 days		12 years 3 months 18 days
Spire Alabama Inc [Member] | Pension Plan Two [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate					3.10%		3.10%		5.65%	3%
Defined Benefit Plan, Benefit Obligation, Settlement Losses Amortized Over Remaining Actuarial Life (Year)				12 years 4 months 24 days		12 years 7 months 6 days
Spire Alabama Inc [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer								$ 0
Anticipated Contributions to Pension Plans Qualified Trusts								$ 0
Spire Missouri [Member]
Regulatory Asset, Total			784,700,000		$ 685,400,000	$ 784,700,000	$ 685,400,000		$ 835,700,000
Spire Missouri [Member] | Pension Costs [Member] | Missouri West [Member]
Regulatory Asset, Total	$ 4,400,000	$ 5,500,000
Spire Missouri [Member] | Pension Costs [Member] | Missouri East [Member]
Regulatory Asset, Total	32,400,000	29,000,000
Spire Missouri [Member] | Pension and Other Postretirement Plans Costs [Member] | Missouri West [Member]
Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided	$ 1,100,000	$ 3,300,000
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)		8 years
Additional Remaining Recovery Period of Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided (Year)	8 years
Spire Missouri [Member] | Pension and Other Postretirement Plans Costs [Member] | Missouri East [Member]
Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided	$ 11,000,000	$ 21,600,000
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)		8 years
Additional Remaining Recovery Period of Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided (Year)	8 years
Spire Missouri [Member] | Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement							21,600,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			$ 0		$ (6,800,000)	0	$ (6,800,000)
Anticipated Contributions to Pension Plans Qualified Trusts				$ 800,000
Spire Missouri [Member] | Pension Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer						$ 23.2
Spire Missouri [Member] | Pension Plan [Member] | Nonqualified Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 0
Spire Missouri [Member] | Pension Plan One [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				5.60%	3.60%		3.60%		5.70%	3%
Spire Missouri [Member] | Other Postretirement Benefits Plan [Member]
Postretirement Benefit Plans, Recovery in Rates Base Allowance	$ 8,600,000

Note 9 - Pension Plans and Ot_4

Note 9 - Pension Plans and Other Postretirement Benefits - Net Pension Costs (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Pension Plan [Member]
Service cost – benefits earned during the period	$ 3.9		$ 5.4	$ 8	$ 10.8
Interest cost on projected benefit obligation	5.9		5.3	12.3	10.4
Expected return on plan assets	(5.7)		(8.2)	(12.1)	(16.4)
Amortization of prior service credit	(1.2)		(1.2)	(2.3)	(2.3)
Amortization of actuarial loss	1.6		3.6	3.2	7.3
Loss on lump-sum settlements	0		11.7	8.6	11.7
Subtotal	4.5		16.6	17.7	21.5
Regulatory adjustment	10.4		(1.2)	12.2	9.4
Net pension cost	14.9		15.4	29.9	30.9
Pension Plan [Member] | Spire Missouri [Member]
Service cost – benefits earned during the period	2.9		3.8	5.7	7.7
Interest cost on projected benefit obligation	4.4		3.6	8.9	7.1
Expected return on plan assets	(4.5)		(5.9)	(9)	(11.9)
Amortization of prior service credit	(0.5)		(0.5)	(1)	(1)
Amortization of actuarial loss	1.6		2.8	3.1	5.6
Loss on lump-sum settlements	0		6.8	0	6.8
Subtotal	3.9		10.6	7.7	14.3
Regulatory adjustment	8.1		1.1	16.2	9.6
Net pension cost	12		11.7	23.9	23.9
Pension Plan [Member] | Spire Alabama Inc [Member]
Service cost – benefits earned during the period	0.8		1.3	1.9	2.7
Interest cost on projected benefit obligation	0.8		1.2	2.1	2.3
Expected return on plan assets	(0.5)		(1.4)	(1.6)	(2.8)
Amortization of prior service credit	(0.6)		(0.6)	(1.2)	(1.2)
Amortization of actuarial loss	0.2		0.8	0.3	1.7
Loss on lump-sum settlements	0	$ 8.6	4.9	8.6	4.9
Subtotal	0.7		6.2	10.1	7.6
Regulatory adjustment	2.1		(2.5)	(4.4)	(0.6)
Net pension cost	2.8		3.7	5.7	7
Other Postretirement Benefits Plan [Member]
Service cost – benefits earned during the period	1.2		2	2.4	3.9
Interest cost on projected benefit obligation	2.2		1.5	4.3	3
Expected return on plan assets	(3.9)		(4.3)	(7.8)	(8.5)
Amortization of prior service credit	0		0.2	0.1	0.5
Amortization of actuarial loss	(1.1)		(0.6)	(2.1)	(1.2)
Subtotal	(1.6)		(1.2)	(3.1)	(2.3)
Regulatory adjustment	0.2		0.1	0.3	3.3
Net pension cost	(1.4)		(1.1)	(2.8)	1
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Service cost – benefits earned during the period	1		1.6	2	3.2
Interest cost on projected benefit obligation	1.7		1.1	3.3	2.2
Expected return on plan assets	(2.7)		(2.9)	(5.3)	(5.7)
Amortization of prior service credit	0.1		0.2	0.3	0.4
Amortization of actuarial loss	(0.8)		(0.5)	(1.6)	(1)
Subtotal	(0.7)		(0.5)	(1.3)	(0.9)
Regulatory adjustment	0.7		0.5	1.3	4.1
Net pension cost	0		0	0	3.2
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Service cost – benefits earned during the period	0.1		0.3	0.3	0.6
Interest cost on projected benefit obligation	0.5		0.3	0.9	0.7
Expected return on plan assets	(1.3)		(1.3)	(2.5)	(2.6)
Amortization of prior service credit	(0.1)		0	(0.2)	0.1
Amortization of actuarial loss	(0.2)		0	(0.3)	0
Subtotal	(1)		(0.7)	(1.8)	(1.2)
Regulatory adjustment	(0.4)		(0.4)	(0.9)	(0.9)
Net pension cost	$ (1.4)		$ (1.1)	$ (2.7)	$ (2.1)

Note 10 - Information by Oper_3

Note 10 - Information by Operating Segment (Details Textual)	3 Months Ended
	Mar. 31, 2023
Number of Reportable Segments	3

Note 10 - Information by Oper_4

Note 10 - Information by Operating Segment - Segment Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenues from external customers	$ 1,123.4	$ 880.9	$ 1,937.4	$ 1,436.3
Intersegment revenues	0	0	0	0
Operating Revenues	1,123.4	880.9	1,937.4	1,436.3
Natural gas	586.5	392	1,005.7	641.2
Operation and maintenance	132.1	113.2	264.2	229.6
Depreciation and amortization	62.6	58.9	124.7	115.8
Taxes, other than income taxes	81.9	71.6	132.3	109.2
Total Operating Expenses	863.1	635.7	1,526.9	1,095.8
Operating Income (Loss)	260.3	245.2	410.5	340.5
Net Economic Earnings (Loss)	199.2	181	284.3	243.6
Other Segments [Member]
Revenues from external customers	0.2	0.1	0.3	0.3
Intersegment revenues	3.9	4.2	7.8	7.7
Operating Revenues	4.1	4.3	8.1	8
Natural gas	0	0	0	0
Operation and maintenance	4.9	4.2	8.9	8.4
Depreciation and amortization	0	0.1	0.2	0.2
Taxes, other than income taxes	0.1	0	0.1	0
Total Operating Expenses	5	4.3	9.2	8.6
Operating Income (Loss)	(0.9)	0	(1.1)	(0.6)
Net Economic Earnings (Loss)	(10.7)	(5.6)	(18)	(13.2)
Operating Segments [Member]
Revenues from external customers			0
Intersegment revenues			24.6
Operating Revenues			24.6
Natural gas			16.7
Operation and maintenance			7.9
Depreciation and amortization			0
Taxes, other than income taxes			0
Total Operating Expenses			24.6
Operating Income (Loss)			0
Net Economic Earnings (Loss)			0
Operating Segments [Member] | Gas Utility [Member]
Revenues from external customers	1,054.4	817.4	1,787.4	1,320.9
Intersegment revenues	0.1	0	0.1	0
Operating Revenues	1,054.5	817.4	1,787.5	1,320.9
Natural gas	543.3	356	944.9	566.2
Operation and maintenance	119.3	104.2	239.2	211.5
Depreciation and amortization	60.2	56.5	119.9	111.1
Taxes, other than income taxes	80.4	70.3	130.3	107.3
Total Operating Expenses	803.2	587	1,434.3	996.1
Operating Income (Loss)	251.3	230.4	353.2	324.8
Net Economic Earnings (Loss)	183.9	169.2	246.8	236.4
Operating Segments [Member] | Gas Marketing [Member]
Revenues from external customers	60.6	59.4	134.7	107.3
Intersegment revenues	0	0	0	0
Operating Revenues	60.6	59.4	134.7	107.3
Natural gas	51.5	45.8	77.5	93.8
Operation and maintenance	5.7	3.2	12	5.9
Depreciation and amortization	0.4	0.4	0.7	0.7
Taxes, other than income taxes	0.6	0.4	0.7	0.4
Total Operating Expenses	58.2	49.8	90.9	100.8
Operating Income (Loss)	2.4	9.6	43.8	6.5
Net Economic Earnings (Loss)	21.8	14.4	47.5	14.9
Operating Segments [Member] | Midstream [Member]
Revenues from external customers	8.2	4	15	7.8
Intersegment revenues	8.3	9.8	16.7	18.9
Operating Revenues	16.5	13.8	31.7	26.7
Natural gas	0	0	0	0
Operation and maintenance	6.2	5.8	12	11.6
Depreciation and amortization	2	1.9	3.9	3.8
Taxes, other than income taxes	0.8	0.9	1.2	1.5
Total Operating Expenses	9	8.6	17.1	16.9
Operating Income (Loss)	7.5	5.2	14.6	9.8
Net Economic Earnings (Loss)	4.2	3	$ 8	5.5
Consolidation, Eliminations [Member]
Revenues from external customers	0	0		0
Intersegment revenues	(12.3)	(14)		(26.6)
Operating Revenues	(12.3)	(14)		(26.6)
Natural gas	(8.3)	(9.8)		(18.8)
Operation and maintenance	(4)	(4.2)		(7.8)
Depreciation and amortization	0	0		0
Taxes, other than income taxes	0	0		0
Total Operating Expenses	(12.3)	(14)		(26.6)
Operating Income (Loss)	0	0		0
Net Economic Earnings (Loss)	$ 0	$ 0		$ 0

Note 10 - Information by Oper_5

Note 10 - Information by Operating Segment - Net Economic Earnings to Net Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenues from external customers	$ 1,123.4	$ 880.9	$ 1,937.4	$ 1,436.3
Intersegment revenues	0	0	0	0
Intersegment revenues	0	0	0	0
Operating Revenues	1,123.4	880.9	1,937.4	1,436.3
Total Operating Revenues	(1,123.4)	(880.9)	(1,937.4)	(1,436.3)
Natural gas	586.5	392	1,005.7	641.2
Natural gas	(586.5)	(392)	(1,005.7)	(641.2)
Operation and maintenance	132.1	113.2	264.2	229.6
Operation and maintenance	(132.1)	(113.2)	(264.2)	(229.6)
Depreciation and amortization	62.6	58.9	124.7	115.8
Taxes, other than income taxes	81.9	71.6	132.3	109.2
Total Operating Expenses	863.1	635.7	1,526.9	1,095.8
Total Operating Expenses	(863.1)	(635.7)	(1,526.9)	(1,095.8)
Operating Income (Loss)	260.3	245.2	410.5	340.5
Net Economic Earnings (Loss)	199.2	181	284.3	243.6
Net Income	179.2	173.6	270.2	229.3
Fair value and timing adjustments	26.6	9.9	18.8	13.6
Income tax adjustments	(6.6)	(2.5)	(4.7)	0.7
Net Economic Earnings	199.2	181	284.3	243.6
Other Segments [Member]
Revenues from external customers	0.2	0.1	0.3	0.3
Intersegment revenues	3.9	4.2	7.8	7.7
Intersegment revenues	(3.9)	(4.2)	(7.8)	(7.7)
Operating Revenues	4.1	4.3	8.1	8
Total Operating Revenues	(4.1)	(4.3)	(8.1)	(8)
Natural gas	0	0	0	0
Natural gas	0	0	0	0
Operation and maintenance	4.9	4.2	8.9	8.4
Operation and maintenance	(4.9)	(4.2)	(8.9)	(8.4)
Depreciation and amortization	0	0.1	0.2	0.2
Taxes, other than income taxes	0.1	0	0.1	0
Total Operating Expenses	5	4.3	9.2	8.6
Total Operating Expenses	(5)	(4.3)	(9.2)	(8.6)
Operating Income (Loss)	(0.9)	0	(1.1)	(0.6)
Net Economic Earnings (Loss)	(10.7)	(5.6)	(18)	(13.2)
Net Economic Earnings	(10.7)	(5.6)	(18)	(13.2)
Operating Segments [Member]
Revenues from external customers			0
Intersegment revenues			24.6
Intersegment revenues			(24.6)
Operating Revenues			24.6
Total Operating Revenues			(24.6)
Natural gas			16.7
Natural gas			(16.7)
Operation and maintenance			7.9
Operation and maintenance			(7.9)
Depreciation and amortization			0
Taxes, other than income taxes			0
Total Operating Expenses			24.6
Total Operating Expenses			(24.6)
Operating Income (Loss)			0
Net Economic Earnings (Loss)			0
Net Economic Earnings			0
Operating Segments [Member] | Gas Utility [Member]
Revenues from external customers	1,054.4	817.4	1,787.4	1,320.9
Intersegment revenues	0.1	0	0.1	0
Intersegment revenues	(0.1)	0	(0.1)	0
Operating Revenues	1,054.5	817.4	1,787.5	1,320.9
Total Operating Revenues	(1,054.5)	(817.4)	(1,787.5)	(1,320.9)
Natural gas	543.3	356	944.9	566.2
Natural gas	(543.3)	(356)	(944.9)	(566.2)
Operation and maintenance	119.3	104.2	239.2	211.5
Operation and maintenance	(119.3)	(104.2)	(239.2)	(211.5)
Depreciation and amortization	60.2	56.5	119.9	111.1
Taxes, other than income taxes	80.4	70.3	130.3	107.3
Total Operating Expenses	803.2	587	1,434.3	996.1
Total Operating Expenses	(803.2)	(587)	(1,434.3)	(996.1)
Operating Income (Loss)	251.3	230.4	353.2	324.8
Net Economic Earnings (Loss)	183.9	169.2	246.8	236.4
Net Economic Earnings	183.9	169.2	246.8	236.4
Operating Segments [Member] | Gas Marketing [Member]
Revenues from external customers	60.6	59.4	134.7	107.3
Intersegment revenues	0	0	0	0
Intersegment revenues	0	0	0	0
Operating Revenues	60.6	59.4	134.7	107.3
Total Operating Revenues	(60.6)	(59.4)	(134.7)	(107.3)
Natural gas	51.5	45.8	77.5	93.8
Natural gas	(51.5)	(45.8)	(77.5)	(93.8)
Operation and maintenance	5.7	3.2	12	5.9
Operation and maintenance	(5.7)	(3.2)	(12)	(5.9)
Depreciation and amortization	0.4	0.4	0.7	0.7
Taxes, other than income taxes	0.6	0.4	0.7	0.4
Total Operating Expenses	58.2	49.8	90.9	100.8
Total Operating Expenses	(58.2)	(49.8)	(90.9)	(100.8)
Operating Income (Loss)	2.4	9.6	43.8	6.5
Net Economic Earnings (Loss)	21.8	14.4	47.5	14.9
Net Economic Earnings	21.8	14.4	47.5	14.9
Operating Segments [Member] | Midstream [Member]
Revenues from external customers	8.2	4	15	7.8
Intersegment revenues	8.3	9.8	16.7	18.9
Intersegment revenues	(8.3)	(9.8)	(16.7)	(18.9)
Operating Revenues	16.5	13.8	31.7	26.7
Total Operating Revenues	(16.5)	(13.8)	(31.7)	(26.7)
Natural gas	0	0	0	0
Natural gas	0	0	0	0
Operation and maintenance	6.2	5.8	12	11.6
Operation and maintenance	(6.2)	(5.8)	(12)	(11.6)
Depreciation and amortization	2	1.9	3.9	3.8
Taxes, other than income taxes	0.8	0.9	1.2	1.5
Total Operating Expenses	9	8.6	17.1	16.9
Total Operating Expenses	(9)	(8.6)	(17.1)	(16.9)
Operating Income (Loss)	7.5	5.2	14.6	9.8
Net Economic Earnings (Loss)	4.2	3	8	5.5
Net Economic Earnings	$ 4.2	$ 3	$ 8	$ 5.5

Note 10 - Information by Oper_6

Note 10 - Information by Operating Segment - Total Assets by Segment (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022
Total Assets	$ 10,049	$ 10,083.7	$ 9,401.3
Operating Segments [Member] | Gas Utility [Member]
Total Assets	8,317.6	8,042.8	7,684.1
Operating Segments [Member] | Gas Marketing [Member]
Total Assets	335	638.7	431.1
Operating Segments [Member] | Midstream [Member]
Total Assets	506.2	446	420.3
Operating Segments [Member] | Other Segments [Member]
Total Assets	1,959.1	2,449.2	2,123.5
Consolidation, Eliminations [Member]
Total Assets	$ (1,068.9)	$ (1,493)	$ (1,257.7)

Note 11 - Commitments and Con_2

Note 11 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Long-Term Purchase Commitment, Amount	$ 1,551.7
Capital Committed to Contribute to Partnership		$ 10
Remaining Unfunded Capital Commitment	7.7
Spire Missouri [Member]
Long-Term Purchase Commitment, Amount	1,133
Spire Alabama Inc [Member]
Long-Term Purchase Commitment, Amount	$ 233.4