CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020
ASSETS
Utility Plant	$ 7,110.2	$ 6,766.3	$ 6,472.2
Less: Accumulated depreciation and amortization	2,173.1	2,086.2	1,882.1
Net Utility Plant	4,937.1	4,680.1	4,590.1
Non-utility Property (net of accumulated depreciation and amortization of $28.8, $19.0 and $20.8 at June 30, 2021, September 30, 2020, and June 30, 2020, respectively)	463.6	432.3	420.1
Other Investments	76.4	71.7	70.6
Total Other Property and Investments	540.0	504.0	490.7
Current Assets:
Cash and cash equivalents	23.9	4.1	7.4
Accounts receivable:
Utility	342.6	131.8	153.2
Other	193.9	146.4	122.4
Allowance for credit losses	(34.5)	(24.9)	(27.5)
Delayed customer billings	13.2	10.0	10.5
Inventories:
Natural gas	179.9	154.3	110.5
Propane gas	8.7	10.7	10.7
Materials and supplies	27.8	26.5	27.4
Regulatory assets	65.1	69.5	70.2
Prepayments	42.4	29.2	42.2
Other	35.3	33.0	32.3
Total Current Assets	898.3	590.6	559.3
Deferred Charges and Other Assets:
Goodwill	1,171.6	1,171.6	1,171.6
Regulatory assets	1,119.4	1,069.4	791.8
Other	226.9	225.5	219.1
Total Deferred Charges and Other Assets	2,517.9	2,466.5	2,182.5
Total Assets	8,893.3	8,241.2	7,822.6
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at June 30, 2021, September 30, 2020, and June 30, 2020)	242.0	242.0	242.0
Common stock (par value $1.00 per share; 70.0 million shares authorized; 51.7 million, 51.6 million, and 51.5 million shares issued and outstanding at June 30, 2021, September 30, 2020, and June 30, 2020, respectively)	51.7	51.6	51.5
Paid-in capital and common stock	1,513.9	1,549.2	1,539.9
Retained earnings	887.6	720.7	774.6
Accumulated other comprehensive gain (loss)	1.9	(41.2)	(49.6)
Total Shareholders' Equity	2,697.1	2,522.3	2,558.4
Temporary equity	9.3	3.4	4.1
Long-term debt (less current portion)	2,939.0	2,423.7	2,478.3
Total Capitalization	5,645.4	4,949.4	5,040.8
Current Liabilities:
Current portion of long-term debt	110.8	60.4	5.4
Notes payable	461.0	648.0	477.6
Accounts payable	294.3	243.3	200.8
Advance customer billings	13.8	45.3	22.4
Wages and compensation accrued	56.1	46.3	44.3
Customer deposits	29.1	30.6	35.4
Taxes accrued	68.1	71.4	61.0
Regulatory liabilities	46.8	113.0	58.8
Other	211.8	190.9	202.1
Total Current Liabilities	1,291.8	1,449.2	1,107.8
Deferred Credits and Other Liabilities:
Deferred income taxes	605.8	511.4	479.7
Pension and postretirement benefit costs	231.8	309.0	271.9
Asset retirement obligations	556.5	540.1	348.2
Regulatory liabilities	414.6	343.7	449.6
Other	147.4	138.4	124.6
Total Deferred Credits and Other Liabilities	1,956.1	1,842.6	1,674.0
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	8,893.3	8,241.2	7,822.6
Spire Missouri
ASSETS
Utility Plant	4,173.9	3,931.2	3,865.3
Less: Accumulated depreciation and amortization	883.3	825.7	817.7
Net Utility Plant	3,290.6	3,105.5	3,047.6
Other Investments	60.7	56.7	55.6
Current Assets:
Cash and cash equivalents	4.3	0.0	0.7
Accounts receivable:
Utility	290.8	92.5	109.6
Associated companies	38.4	2.7	1.1
Other	21.5	34.1	21.6
Allowance for credit losses	(27.4)	(18.1)	(19.0)
Delayed customer billings	9.9	2.4	6.6
Inventories:
Natural gas	133.3	95.1	68.3
Propane gas	8.7	10.7	10.7
Materials and supplies	15.4	15.6	16.2
Regulatory assets	36.6	32.1	29.5
Prepayments	28.4	20.7	27.3
Total Current Assets	559.9	287.8	272.6
Deferred Charges and Other Assets:
Goodwill	210.2	210.2	210.2
Regulatory assets	583.8	548.7	531.9
Other	98.0	96.0	82.2
Total Deferred Charges and Other Assets	892.0	854.9	824.3
Total Assets	4,803.2	4,304.9	4,200.1
Capitalization:
Paid-in capital and common stock	765.1	765.1	765.1
Retained earnings	825.7	672.9	671.7
Accumulated other comprehensive gain (loss)	(2.6)	(2.9)	(2.4)
Total Shareholders' Equity	1,588.2	1,435.1	1,434.4
Long-term debt (less current portion)	1,338.6	1,092.0	1,091.9
Total Capitalization	2,926.8	2,527.1	2,526.3
Current Liabilities:
Notes payable	250.0	0.0	0.0
Notes payable ? associated companies	217.5	301.2	218.3
Accounts payable	58.8	66.7	60.4
Accounts payable ? associated companies	7.6	9.3	6.8
Advance customer billings	5.4	32.7	14.4
Wages and compensation accrued	36.6	33.3	30.4
Customer deposits	8.1	9.3	13.1
Taxes accrued	33.9	39.1	30.9
Regulatory liabilities	27.1	103.2	50.8
Other	43.6	39.9	33.5
Total Current Liabilities	688.6	634.7	458.6
Deferred Credits and Other Liabilities:
Deferred income taxes	475.7	434.7	398.6
Pension and postretirement benefit costs	155.3	217.2	206.4
Asset retirement obligations	158.1	153.4	178.9
Regulatory liabilities	342.8	274.8	378.9
Other	55.9	63.0	52.4
Total Deferred Credits and Other Liabilities	1,187.8	1,143.1	1,215.2
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	4,803.2	4,304.9	4,200.1
Spire Alabama
ASSETS
Utility Plant	2,569.1	2,469.9	2,244.8
Less: Accumulated depreciation and amortization	1,150.4	1,117.0	916.1
Net Utility Plant	1,418.7	1,352.9	1,328.7
Current Assets:
Cash and cash equivalents	9.5	0.0	0.0
Accounts receivable:
Utility	42.6	31.4	36.2
Associated companies	0.5	0.6	0.3
Other	5.6	5.8	8.1
Allowance for credit losses	(6.0)	(5.5)	(7.2)
Delayed customer billings	3.2	7.5	3.9
Inventories:
Natural gas	24.5	22.5	18.8
Materials and supplies	9.7	8.4	8.8
Regulatory assets	17.1	20.4	23.4
Prepayments	8.2	4.3	8.4
Other	0.0	0.2	0.1
Total Current Assets	114.9	95.6	100.8
Deferred Charges and Other Assets:
Regulatory assets	508.2	489.9	232.1
Deferred income taxes	30.9	59.3	56.1
Other	53.6	53.7	61.6
Total Deferred Charges and Other Assets	592.7	602.9	349.8
Total Assets	2,126.3	2,051.4	1,779.3
Capitalization:
Paid-in capital and common stock	328.9	350.9	350.9
Retained earnings	567.8	500.8	515.7
Total Shareholders' Equity	896.7	851.7	866.6
Long-term debt (less current portion)	571.2	471.8	471.8
Total Capitalization	1,467.9	1,323.5	1,338.4
Current Liabilities:
Current portion of long-term debt	50.0	0.0	0.0
Notes payable ? associated companies	0.0	121.3	85.6
Accounts payable	34.8	43.7	36.3
Accounts payable ? associated companies	4.5	4.2	4.2
Advance customer billings	7.2	11.5	7.2
Wages and compensation accrued	8.6	8.0	7.4
Customer deposits	18.4	18.7	19.4
Taxes accrued	27.8	28.0	26.6
Regulatory liabilities	15.5	3.9	2.5
Other	15.4	11.8	14.0
Total Current Liabilities	182.2	251.1	203.2
Deferred Credits and Other Liabilities:
Pension and postretirement benefit costs	65.8	74.9	53.1
Asset retirement obligations	385.5	374.3	153.3
Regulatory liabilities	17.5	18.5	20.9
Other	7.4	9.1	10.4
Total Deferred Credits and Other Liabilities	476.2	476.8	237.7
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	$ 2,126.3	$ 2,051.4	$ 1,779.3