CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020
ASSETS
Utility Plant	$ 6,974.3	$ 6,766.3	$ 6,369.4
Less: Accumulated depreciation and amortization	2,145.1	2,086.2	1,848.4
Net Utility Plant	4,829.2	4,680.1	4,521.0
Non-utility Property (net of accumulated depreciation and amortization of $25.4, $19.0 and $17.5 at March 31, 2021, September 30, 2020, and March 31, 2020, respectively)	457.0	432.3	547.4
Other Investments	76.4	71.7	68.1
Total Other Property and Investments	533.4	504.0	615.5
Current Assets:
Cash and cash equivalents	104.0	4.1	108.4
Accounts receivable:
Utility	447.7	131.8	248.2
Other	182.3	146.4	132.8
Allowance for credit losses	(34.4)	(24.9)	(28.0)
Delayed customer billings	20.7	10.0	16.9
Inventories:
Natural gas	143.0	154.3	90.3
Propane gas	8.7	10.7	10.7
Materials and supplies	28.3	26.5	26.1
Regulatory assets	60.4	69.5	68.0
Prepayments	29.4	29.2	27.9
Other	49.9	33.0	17.5
Total Current Assets	1,040.0	590.6	718.8
Deferred Charges and Other Assets:
Goodwill	1,171.6	1,171.6	1,171.6
Regulatory assets	1,133.6	1,069.4	770.7
Other	229.0	225.5	220.4
Total Deferred Charges and Other Assets	2,534.2	2,466.5	2,162.7
Total Assets	8,936.8	8,241.2	8,018.0
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at March 31, 2021, September 30, 2020, and March 31, 2020)	242.0	242.0	242.0
Common stock (par value $1.00 per share; 70.0 million shares authorized; 51.7 million, 51.6 million, and 51.2 million shares issued and outstanding at March 31, 2021, September 30, 2020, and March 31, 2020, respectively)	51.7	51.6	51.2
Paid-in capital and common stock	1,512.2	1,549.2	1,520.7
Retained earnings	920.1	720.7	902.3
Accumulated other comprehensive gain (loss)	5.3	(41.2)	(50.6)
Total Shareholders' Equity	2,731.3	2,522.3	2,665.6
Temporary equity	8.2	3.4	3.9
Long-term debt (less current portion)	2,692.5	2,423.7	2,484.8
Total Capitalization	5,432.0	4,949.4	5,154.3
Current Liabilities:
Current portion of long-term debt	110.8	60.4	5.4
Notes payable	653.5	648.0	560.6
Accounts payable	352.1	243.3	221.4
Advance customer billings	11.4	45.3	11.6
Wages and compensation accrued	43.5	46.3	34.0
Customer deposits	29.9	30.6	35.9
Taxes accrued	60.0	71.4	55.1
Regulatory liabilities	56.3	113.0	31.8
Other	190.0	190.9	196.7
Total Current Liabilities	1,507.5	1,449.2	1,152.5
Deferred Credits and Other Liabilities:
Deferred income taxes	602.8	511.4	498.1
Pension and postretirement benefit costs	274.4	309.0	272.1
Asset retirement obligations	551.0	540.1	344.7
Regulatory liabilities	423.5	343.7	472.3
Other	145.6	138.4	124.0
Total Deferred Credits and Other Liabilities	1,997.3	1,842.6	1,711.2
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	8,936.8	8,241.2	8,018.0
Spire Missouri
ASSETS
Utility Plant	4,089.1	3,931.2	3,790.8
Less: Accumulated depreciation and amortization	869.9	825.7	795.2
Net Utility Plant	3,219.2	3,105.5	2,995.6
Other Investments	59.4	56.7	53.5
Current Assets:
Cash and cash equivalents	0.0	0.0	5.1
Accounts receivable:
Utility	363.9	92.5	169.2
Associated companies	2.8	2.7	3.7
Other	22.2	34.1	22.4
Allowance for credit losses	(26.6)	(18.1)	(20.2)
Delayed customer billings	18.4	2.4	16.9
Inventories:
Natural gas	115.6	95.1	58.5
Propane gas	8.7	10.7	10.7
Materials and supplies	15.8	15.6	15.6
Regulatory assets	37.5	32.1	29.4
Prepayments	18.9	20.7	15.9
Total Current Assets	577.2	287.8	327.2
Deferred Charges and Other Assets:
Goodwill	210.2	210.2	210.2
Regulatory assets	604.3	548.7	512.1
Other	99.0	96.0	83.4
Total Deferred Charges and Other Assets	913.5	854.9	805.7
Total Assets	4,769.3	4,304.9	4,182.0
Capitalization:
Paid-in capital and common stock	765.1	765.1	765.1
Retained earnings	822.6	672.9	676.5
Accumulated other comprehensive gain (loss)	(2.7)	(2.9)	(2.5)
Total Shareholders' Equity	1,585.0	1,435.1	1,439.1
Long-term debt (less current portion)	1,092.4	1,092.0	1,098.7
Total Capitalization	2,677.4	2,527.1	2,537.8
Current Liabilities:
Notes payable	250.0	0.0	185.1
Notes payable ? associated companies	369.4	301.2	39.6
Accounts payable	87.5	66.7	63.8
Accounts payable ? associated companies	7.7	9.3	5.2
Advance customer billings	2.1	32.7	5.4
Wages and compensation accrued	28.0	33.3	24.1
Customer deposits	8.2	9.3	13.2
Taxes accrued	29.4	39.1	26.6
Regulatory liabilities	37.6	103.2	24.3
Other	43.4	39.9	32.7
Total Current Liabilities	863.3	634.7	420.0
Deferred Credits and Other Liabilities:
Deferred income taxes	470.9	434.7	390.6
Pension and postretirement benefit costs	193.7	217.2	205.0
Asset retirement obligations	156.5	153.4	177.1
Regulatory liabilities	353.5	274.8	400.4
Other	54.0	63.0	51.1
Total Deferred Credits and Other Liabilities	1,228.6	1,143.1	1,224.2
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	4,769.3	4,304.9	4,182.0
Spire Alabama
ASSETS
Utility Plant	2,523.4	2,469.9	2,217.0
Less: Accumulated depreciation and amortization	1,136.5	1,117.0	904.7
Net Utility Plant	1,386.9	1,352.9	1,312.3
Current Assets:
Cash and cash equivalents	18.2	0.0	0.1
Accounts receivable:
Utility	66.4	31.4	65.6
Associated companies	0.5	0.6	0.1
Other	5.7	5.8	7.8
Allowance for credit losses	(6.5)	(5.5)	(6.8)
Delayed customer billings	2.3	7.5	0.0
Inventories:
Natural gas	14.8	22.5	16.3
Materials and supplies	10.0	8.4	8.3
Regulatory assets	11.8	20.4	23.3
Prepayments	4.7	4.3	5.7
Other	0.1	0.2	0.3
Total Current Assets	148.0	95.6	120.7
Notes receivable – associated companies	20.0	0.0	0.0
Deferred Charges and Other Assets:
Regulatory assets	501.2	489.9	230.1
Deferred income taxes	33.2	59.3	57.4
Other	53.5	53.7	61.0
Total Deferred Charges and Other Assets	587.9	602.9	348.5
Total Assets	2,122.8	2,051.4	1,781.5
Capitalization:
Paid-in capital and common stock	328.9	350.9	350.9
Retained earnings	566.8	500.8	518.1
Total Shareholders' Equity	895.7	851.7	869.0
Long-term debt (less current portion)	571.1	471.8	471.7
Total Capitalization	1,466.8	1,323.5	1,340.7
Current Liabilities:
Current portion of long-term debt	50.0	0.0	0.0
Notes payable	0.0	0.0	50.0
Notes payable ? associated companies	0.0	121.3	33.0
Accounts payable	37.4	43.7	48.0
Accounts payable ? associated companies	8.0	4.2	4.8
Advance customer billings	5.4	11.5	5.3
Wages and compensation accrued	6.4	8.0	5.9
Customer deposits	19.0	18.7	19.9
Taxes accrued	25.1	28.0	23.0
Regulatory liabilities	14.2	3.9	2.4
Other	14.8	11.8	9.7
Total Current Liabilities	180.3	251.1	202.0
Deferred Credits and Other Liabilities:
Pension and postretirement benefit costs	68.2	74.9	54.6
Asset retirement obligations	381.7	374.3	151.7
Regulatory liabilities	18.0	18.5	21.6
Other	7.8	9.1	10.9
Total Deferred Credits and Other Liabilities	475.7	476.8	238.8
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	$ 2,122.8	$ 2,051.4	$ 1,781.5