CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Utility Plant	$ 7,329.2	$ 7,225.0	$ 6,860.2
Less: Accumulated depreciation and amortization	2,204.4	2,169.3	2,113.3
Net Utility Plant	5,124.8	5,055.7	4,746.9
Non-utility Property (net of accumulated depreciation and amortization of $36.7, $32.1 and $22.2 at December 31, 2021, September 30, 2021, and December 31, 2020, respectively)	474.2	471.1	448.7
Other Investments	90.4	83.1	74.8
Total Other Property and Investments	564.6	554.2	523.5
Current Assets:
Cash and cash equivalents	8.2	4.3	3.5
Accounts receivable:
Utility	476.2	338.4	281.5
Other	304.2	288.2	170.4
Allowance for credit losses	(31.4)	(30.3)	(28.9)
Delayed customer billings	11.4	9.2	13.6
Inventories:
Natural gas	284.8	267.7	145.9
Propane gas	8.7	8.7	10.7
Materials and supplies	32.1	28.6	27.9
Regulatory assets	265.7	306.5	70.5
Prepayments	25.5	29.0	30.8
Other	49.9	66.2	44.1
Total Current Assets	1,435.3	1,316.5	770.0
Deferred Charges and Other Assets:
Goodwill	1,171.6	1,171.6	1,171.6
Regulatory assets	1,089.9	993.5	1,079.2
Other	264.3	264.9	224.4
Total Deferred Charges and Other Assets	2,525.8	2,430.0	2,475.2
Total Assets	9,650.5	9,356.4	8,515.6
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at December 31, 2021, September 30, 2021, and December 31, 2020)	242.0	242.0	242.0
Common stock (par value $1.00 per share; 70.0 million shares authorized; 51.7 million, 51.7 million, and 51.7 million shares issued and outstanding at December 31, 2021, September 30, 2021, and December 31, 2020, respectively)	51.7	51.7	51.7
Paid-in capital and common stock	1,516.9	1,517.9	1,550.0
Retained earnings	859.5	843.0	771.2
Accumulated other comprehensive (loss) income	(0.3)	3.6	(28.1)
Total Shareholders' Equity	2,669.8	2,658.2	2,586.8
Temporary equity	9.8	9.8	5.3
Long-term debt (less current portion)	3,206.8	2,939.1	2,517.6
Total Capitalization	5,886.4	5,607.1	5,109.7
Current Liabilities:
Current portion of long-term debt	31.2	55.8	110.8
Notes payable	846.0	672.0	696.1
Accounts payable	427.5	409.9	260.8
Advance customer billings	31.3	32.1	43.2
Wages and compensation accrued	29.9	59.5	26.7
Customer deposits	29.4	28.9	30.9
Taxes accrued	47.2	78.8	41.2
Regulatory liabilities	4.1	34.6	95.5
Other	274.1	236.7	241.5
Total Current Liabilities	1,720.7	1,608.3	1,546.7
Deferred Credits and Other Liabilities:
Deferred income taxes	615.6	612.3	541.9
Pension and postretirement benefit costs	222.5	235.9	289.2
Asset retirement obligations	524.8	519.6	545.6
Regulatory liabilities	531.8	620.9	357.3
Other	148.7	152.3	125.2
Total Deferred Credits and Other Liabilities	2,043.4	2,141.0	1,859.2
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	9,650.5	9,356.4	8,515.6
Spire Missouri
ASSETS
Utility Plant	4,347.8	4,266.6	4,012.8
Less: Accumulated depreciation and amortization	927.4	905.1	851.5
Net Utility Plant	3,420.4	3,361.5	3,161.3
Other Investments	68.9	60.2	59.0
Accounts receivable:
Utility	377.4	279.0	195.4
Associated companies	3.7	4.7	2.3
Other	36.3	57.5	23.6
Allowance for credit losses	(23.8)	(22.6)	(21.4)
Delayed customer billings	4.7	2.4	5.1
Inventories:
Natural gas	186.6	176.7	88.3
Propane gas	8.7	8.7	10.7
Materials and supplies	16.2	15.0	16.1
Regulatory assets	236.9	276.3	32.1
Prepayments	18.4	19.7	20.9
Other	0.0	0.1	0.0
Total Current Assets	865.1	817.5	373.1
Deferred Charges and Other Assets:
Goodwill	210.2	210.2	210.2
Regulatory assets	560.5	483.1	550.4
Other	126.2	125.6	96.1
Total Deferred Charges and Other Assets	896.9	818.9	856.7
Total Assets	5,251.3	5,058.1	4,450.1
Capitalization:
Paid-in capital and common stock	765.1	765.1	765.1
Retained earnings	862.3	817.0	729.5
Accumulated other comprehensive (loss) income	(4.1)	(4.2)	(2.8)
Total Shareholders' Equity	1,623.3	1,577.9	1,491.8
Long-term debt (less current portion)	1,637.0	1,338.4	1,092.2
Total Capitalization	3,260.3	2,916.3	2,584.0
Current Liabilities:
Notes payable	250.0	250.0	0.0
Notes payable ? associated companies	180.4	240.9	393.7
Accounts payable	117.0	89.7	82.6
Accounts payable ? associated companies	11.6	10.2	7.1
Advance customer billings	20.0	19.7	29.8
Wages and compensation accrued	21.0	40.3	19.5
Customer deposits	8.0	8.0	9.0
Taxes accrued	15.4	41.2	13.4
Regulatory liabilities	0.2	17.1	83.4
Other	89.2	47.4	82.6
Total Current Liabilities	712.8	764.5	721.1
Deferred Credits and Other Liabilities:
Deferred income taxes	477.5	480.0	449.4
Pension and postretirement benefit costs	147.9	159.5	198.7
Asset retirement obligations	144.8	143.4	155.0
Regulatory liabilities	447.2	538.8	288.2
Other	60.8	55.6	53.7
Total Deferred Credits and Other Liabilities	1,278.2	1,377.3	1,145.0
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	5,251.3	5,058.1	4,450.1
Spire Alabama
ASSETS
Utility Plant	2,604.8	2,586.5	2,487.4
Less: Accumulated depreciation and amortization	1,137.9	1,124.8	1,122.8
Net Utility Plant	1,466.9	1,461.7	1,364.6
Accounts receivable:
Utility	84.6	49.8	69.6
Associated companies	1.3	0.6	0.7
Other	7.5	6.4	6.1
Allowance for credit losses	(6.7)	(6.6)	(6.2)
Delayed customer billings	6.5	6.7	8.5
Inventories:
Natural gas	44.7	35.5	23.8
Materials and supplies	12.8	10.8	9.2
Regulatory assets	14.6	18.8	22.7
Prepayments	3.6	5.4	5.5
Other	0.0	0.0	0.1
Total Current Assets	168.9	127.4	140.0
Deferred Charges and Other Assets:
Regulatory assets	501.7	483.3	498.2
Deferred income taxes	30.0	34.2	54.5
Other	63.2	63.9	53.5
Total Deferred Charges and Other Assets	594.9	581.4	606.2
Total Assets	2,230.7	2,170.5	2,110.8
Capitalization:
Paid-in capital and common stock	322.9	328.9	339.9
Retained earnings	556.8	552.6	509.0
Total Shareholders' Equity	879.7	881.5	848.9
Long-term debt (less current portion)	571.3	571.2	571.0
Total Capitalization	1,451.0	1,452.7	1,419.9
Current Liabilities:
Current portion of long-term debt	0.0	50.0	50.0
Notes payable ? associated companies	173.7	49.0	27.0
Accounts payable	58.1	52.3	40.0
Accounts payable ? associated companies	3.6	6.0	5.3
Advance customer billings	10.2	11.2	12.5
Wages and compensation accrued	4.1	9.3	4.2
Customer deposits	18.8	18.4	19.2
Taxes accrued	27.3	30.4	24.7
Regulatory liabilities	0.8	13.4	6.9
Other	19.4	17.3	22.5
Total Current Liabilities	316.0	257.3	212.3
Deferred Credits and Other Liabilities:
Pension and postretirement benefit costs	65.1	66.7	73.8
Asset retirement obligations	366.4	362.8	378.0
Regulatory liabilities	25.3	23.4	18.4
Other	6.9	7.6	8.4
Total Deferred Credits and Other Liabilities	463.7	460.5	478.6
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	$ 2,230.7	$ 2,170.5	$ 2,110.8