Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Millions		Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
ASSETS
Utility Plant		$ 7,769.4	$ 7,664.9	$ 7,329.2
Less: Accumulated depreciation and amortization		2,326.5	2,294.5	2,204.4
Net Utility Plant		5,442.9	5,370.4	5,124.8
Non-utility Property (net of accumulated depreciation and amortization of $55.6, $50.7 and $36.7 at December 31, 2022, September 30, 2022, and December 31, 2021, respectively)		508.9	491.4	474.2
Other Investments		93.5	87.8	90.4
Total Other Property and Investments		602.4	579.2	564.6
Other Property and Investments		602.4	579.2	564.6
Current Assets:
Cash and cash equivalents		4.8	6.5	8.2
Utility		479.4	210.8	476.2
Other		334.7	443.8	304.2
Allowance for credit losses		(34.5)	(31.9)	(31.4)
Delayed customer billings		26.7	21.3	11.4
Accounts receivable:
Utility		479.4	210.8	476.2
Other		334.7	443.8	304.2
Allowance for credit losses		(34.5)	(31.9)	(31.4)
Delayed customer billings		26.7	21.3	11.4
Inventories:
Natural gas		320.0	371.8	284.8
Propane gas		8.6	8.6	8.7
Materials and supplies		44.1	41.9	32.1
Regulatory assets		269.1	355.4	265.7
Prepayments		31.6	41.1	25.5
Other current assets		145.2	122.7	49.9
Total Current Assets		1,629.7	1,592.0	1,435.3
Deferred Charges and Other Assets:
Goodwill		1,171.6	1,171.6	1,171.6
Regulatory assets		1,220.7	1,112.4	1,089.9
Other		260.4	258.1	264.3
Total Deferred Charges and Other Assets		2,652.7	2,542.1	2,525.8
Total Assets		10,327.7	10,083.7	9,650.5
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at December 31, 2022, September 30, 2022, and December 31, 2021)		242.0	242.0	242.0
Common stock (par value $1.00 per share; 70.0 million shares authorized; 52.5 million, 52.5 million, and 51.7 million shares issued and outstanding at December 31, 2022, September 30, 2022, and December 31, 2021, respectively)		52.5	52.5	51.7
Paid-in capital		1,571.8	1,571.3	1,516.9
Retained earnings		953.0	905.5	859.5
Accumulated other comprehensive income (loss)		44.8	47.2	(0.3)
Total Shareholders' Equity		2,864.1	2,818.5	2,669.8
Temporary equity		16.2	13.1	9.8
Long-term debt (less current portion)		3,156.3	2,958.5	3,206.8
Total Capitalization		6,036.6	5,790.1	5,886.4
Current Liabilities:
Current portion of long-term debt		256.6	281.2	31.2
Notes payable		1,227.0	1,037.5	846.0
Accounts payable		506.8	617.4	427.5
Advance customer billings		16.9	18.7	31.3
Wages and compensation accrued		30.6	50.2	29.9
Customer deposits		28.8	28.2	29.4
Taxes accrued		57.6	90.1	47.2
Regulatory liabilities		3.7	3.7	4.1
Other current liabilities		276.7	226.6	274.1
Total Current Liabilities		2,404.7	2,353.6	1,720.7
Deferred Credits and Other Liabilities:
Deferred income taxes		699.4	675.1	615.6
Pension and postretirement benefit costs		159.3	163.0	222.5
Asset retirement obligations		526.2	520.9	524.8
Regulatory liabilities		344.9	418.2	531.8
Other noncurrent liabilities		156.6	162.8	148.7
Total Deferred Credits and Other Liabilities		1,886.4	1,940.0	2,043.4
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities		10,327.7	10,083.7	9,650.5
Spire Missouri [Member]
ASSETS
Utility Plant		4,632.6	4,550.4	4,347.8
Less: Accumulated depreciation and amortization		1,003.4	982.1	927.4
Net Utility Plant		3,629.2	3,568.3	3,420.4
Total Other Property and Investments		66.5	58.9	68.9
Other Property and Investments		66.5	58.9	68.9
Current Assets:
Utility		357.2	131.5	377.4
Associated companies		5.8	3.7	3.7
Other		28.6	44.5	36.3
Allowance for credit losses		(28.2)	(24.9)	(23.8)
Delayed customer billings		21.5	16.1	4.7
Accounts receivable:
Utility		357.2	131.5	377.4
Other		28.6	44.5	36.3
Allowance for credit losses		(28.2)	(24.9)	(23.8)
Delayed customer billings		21.5	16.1	4.7
Associated companies		5.8	3.7	3.7
Inventories:
Natural gas		189.9	215.3	186.6
Propane gas		8.6	8.6	8.7
Materials and supplies		23.0	22.0	16.2
Regulatory assets		191.2	288.1	236.9
Prepayments		15.8	23.3	18.4
Total Current Assets		813.4	728.2	865.1
Deferred Charges and Other Assets:
Goodwill		210.2	210.2	210.2
Regulatory assets		634.7	547.6	560.5
Other		106.0	105.0	126.2
Total Deferred Charges and Other Assets		950.9	862.8	896.9
Total Assets		5,460.0	5,218.2	5,251.3
Capitalization:
Retained earnings		979.2	931.9	862.3
Accumulated other comprehensive income (loss)		(2.6)	(2.7)	(4.1)
Total Shareholders' Equity	[1]	1,792.8	1,745.4	1,623.3
Long-term debt (less current portion)		1,388.1	1,387.7	1,637.0
Total Capitalization		3,180.9	3,133.1	3,260.3
Paid-in capital and common stock (par value $1.00 per share; 50.0 million shares authorized; 25,325, 25,325, and 24,577 shares issued and outstanding at December 31, 2022, September 30, 2022, and December 31, 2021, respectively)		816.2	816.2	765.1
Current Liabilities:
Current portion of long-term debt		250.0	250.0	0.0
Notes payable		0.0	0.0	250.0
Accounts payable		166.6	119.0	117.0
Advance customer billings		5.3	7.0	20.0
Wages and compensation accrued		21.5	33.8	21.0
Customer deposits		6.3	6.5	8.0
Taxes accrued		24.3	50.4	15.4
Regulatory liabilities		0.0	0.0	0.2
Other current liabilities		92.9	45.6	89.2
Total Current Liabilities		1,238.2	970.9	712.8
Notes payable – associated companies		651.2	445.3	180.4
Accounts payable – associated companies		20.1	13.3	11.6
Deferred Credits and Other Liabilities:
Deferred income taxes		512.4	500.1	477.5
Pension and postretirement benefit costs		101.9	115.5	147.9
Asset retirement obligations		111.7	110.6	144.8
Regulatory liabilities		259.0	331.8	447.2
Other noncurrent liabilities		55.9	56.2	60.8
Total Deferred Credits and Other Liabilities		1,040.9	1,114.2	1,278.2
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities		5,460.0	5,218.2	5,251.3
Spire Alabama Inc [Member]
ASSETS
Utility Plant		2,755.8	2,732.6	2,604.8
Less: Accumulated depreciation and amortization		1,196.5	1,184.1	1,137.9
Net Utility Plant		1,559.3	1,548.5	1,466.9
Current Assets:
Cash and cash equivalents		0.0	2.4	0.0
Utility		100.2	69.9	84.6
Associated companies		0.8	1.3	1.3
Other		5.4	6.5	7.5
Allowance for credit losses		(5.5)	(6.3)	(6.7)
Delayed customer billings		4.8	4.8	6.5
Accounts receivable:
Utility		100.2	69.9	84.6
Other		5.4	6.5	7.5
Allowance for credit losses		(5.5)	(6.3)	(6.7)
Delayed customer billings		4.8	4.8	6.5
Associated companies		0.8	1.3	1.3
Inventories:
Natural gas		66.1	72.5	44.7
Materials and supplies		17.2	16.3	12.8
Regulatory assets		67.3	56.9	14.6
Prepayments		4.1	5.8	3.6
Total Current Assets		260.4	230.1	168.9
Deferred Charges and Other Assets:
Regulatory assets		560.4	538.2	501.7
Other		81.7	81.3	63.2
Total Deferred Charges and Other Assets		649.9	630.5	594.9
Total Assets		2,469.6	2,409.1	2,230.7
Deferred income taxes		7.8	11.0	30.0
Capitalization:
Retained earnings		595.3	589.1	556.8
Total Shareholders' Equity		900.7	906.0	879.7
Long-term debt (less current portion)		745.6	571.5	571.3
Total Capitalization		1,646.3	1,477.5	1,451.0
Paid-in capital and common stock (par value $1.00 per share; 50.0 million shares authorized; 25,325, 25,325, and 24,577 shares issued and outstanding at December 31, 2022, September 30, 2022, and December 31, 2021, respectively)		305.4	316.9	322.9
Current Liabilities:
Accounts payable		87.1	85.6	58.1
Advance customer billings		9.7	9.9	10.2
Wages and compensation accrued		3.2	7.6	4.1
Customer deposits		19.7	19.0	18.8
Taxes accrued		28.8	31.3	27.3
Regulatory liabilities		0.0	0.0	0.8
Other current liabilities		20.7	22.4	19.4
Total Current Liabilities		319.0	441.1	316.0
Notes payable – associated companies		145.8	260.9	173.7
Accounts payable – associated companies		4.0	4.4	3.6
Deferred Credits and Other Liabilities:
Pension and postretirement benefit costs		51.4	40.5	65.1
Asset retirement obligations		402.8	398.7	366.4
Regulatory liabilities		22.2	23.0	25.3
Other noncurrent liabilities		27.9	28.3	6.9
Total Deferred Credits and Other Liabilities		504.3	490.5	463.7
Total Capitalization and Liabilities		$ 2,469.6	$ 2,409.1	$ 2,230.7

[1] Accumulated other comprehensive income (loss)