CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Utility Plant	$ 6,256.1	$ 6,146.5	$ 5,754.8
Less: Accumulated depreciation and amortization	1,823.8	1,794.5	1,709.5
Net Utility Plant	4,432.3	4,352.0	4,045.3
Non-utility Property (net of accumulated depreciation and amortization of $13.9, $12.7 and $11.1 at December 31, 2019, September 30, 2019, and December 31, 2018, respectively)	518.7	477.8	254.5
Other Investments	74.7	72.3	69.5
Total Other Property and Investments	593.4	550.1	324.0
Current Assets:
Cash and cash equivalents	21.5	5.8	8.4
Accounts receivable:
Utility	282.0	139.8	339.2
Other	195.6	172.8	242.1
Allowance for doubtful accounts	(26.3)	(23.0)	(24.6)
Delayed customer billings	6.6	4.3	10.9
Inventories:
Natural gas	149.1	162.6	176.2
Propane gas	10.7	10.7	12.0
Materials and supplies	25.8	23.3	24.5
Regulatory assets	67.9	78.6	63.4
Prepayments	30.8	29.1	25.7
Other	12.7	10.5	27.5
Total Current Assets	776.4	614.5	905.3
Deferred Charges and Other Assets:
Goodwill	1,171.6	1,171.6	1,171.6
Regulatory assets	750.5	767.6	655.1
Other	236.8	163.4	130.9
Total Deferred Charges and Other Assets	2,158.9	2,102.6	1,957.6
Total Assets	7,961.0	7,619.2	7,232.2
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at December 31, 2019 and September 30, 2019)	242.0	242.0	0.0
Common stock (par value $1.00 per share; 70.0 million shares authorized; 51.1 million, 51.0 million, and 50.7 million shares issued and outstanding at December 31, 2019, September 30, 2019, and December 31, 2018, respectively)	51.1	51.0	50.7
Paid-in capital and common stock	1,506.7	1,505.8	1,482.8
Retained earnings	803.1	775.5	752.9
Accumulated other comprehensive loss	(16.9)	(31.3)	(1.8)
Total Shareholders' Equity	2,586.0	2,543.0	2,284.6
Temporary equity	4.1	3.4	0.0
Long-term debt (less current portion)	2,484.4	2,082.6	1,992.0
Total Capitalization	5,074.5	4,629.0	4,276.6
Current Liabilities:
Current portion of long-term debt	45.3	40.0	175.0
Notes payable	518.9	743.2	626.1
Accounts payable	307.9	301.5	430.9
Advance customer billings	31.4	32.6	19.8
Wages and compensation accrued	35.4	45.7	32.8
Customer deposits	36.5	35.6	36.1
Taxes accrued	43.8	68.5	44.6
Regulatory liabilities	50.0	60.8	37.0
Other	183.3	140.9	161.1
Total Current Liabilities	1,252.5	1,468.8	1,563.4
Deferred Credits and Other Liabilities:
Deferred income taxes	475.3	451.4	453.2
Pension and postretirement benefit costs	260.7	264.8	182.1
Asset retirement obligations	340.9	337.6	324.5
Regulatory liabilities	417.8	399.0	363.4
Other	139.3	68.6	69.0
Total Deferred Credits and Other Liabilities	1,634.0	1,521.4	1,392.2
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	7,961.0	7,619.2	7,232.2
Spire Missouri
ASSETS
Utility Plant	3,718.9	3,643.2	3,395.8
Less: Accumulated depreciation and amortization	780.1	764.1	720.4
Net Utility Plant	2,938.8	2,879.1	2,675.4
Other Investments	56.8	53.3	53.6
Current Assets:
Cash and cash equivalents	9.3	2.6	4.9
Accounts receivable:
Utility	193.8	94.6	227.4
Associated companies	4.8	1.4	4.7
Other	23.7	26.5	17.7
Allowance for doubtful accounts	(17.9)	(14.9)	(18.1)
Delayed customer billings	6.6	4.3	10.9
Inventories:
Natural gas	92.7	100.1	129.3
Propane gas	10.7	10.7	12.0
Materials and supplies	15.2	13.3	14.3
Regulatory assets	29.4	29.4	29.7
Prepayments	17.8	18.2	14.7
Total Current Assets	386.1	286.2	447.5
Deferred Charges and Other Assets:
Goodwill	210.2	210.2	210.2
Regulatory assets	491.1	507.5	427.6
Other	88.1	85.6	51.9
Total Deferred Charges and Other Assets	789.4	803.3	689.7
Total Assets	4,171.1	4,021.9	3,866.2
Capitalization:
Paid-in capital and common stock	765.1	765.1	761.6
Retained earnings	613.3	576.6	542.5
Accumulated other comprehensive loss	(2.3)	(2.4)	(1.6)
Total Shareholders' Equity	1,376.1	1,339.3	1,302.5
Long-term debt (less current portion)	1,098.6	925.0	924.5
Total Capitalization	2,474.7	2,264.3	2,227.0
Current Liabilities:
Current portion of long-term debt	0.0	0.0	50.0
Notes payable – associated companies	288.1	386.4	308.0
Accounts payable	76.3	75.7	101.5
Accounts payable – associated companies	11.2	5.5	17.4
Advance customer billings	20.7	20.8	9.1
Wages and compensation accrued	25.0	34.5	25.3
Customer deposits	13.6	13.4	13.3
Taxes accrued	14.6	36.4	14.6
Regulatory liabilities	42.4	52.3	20.6
Other	65.7	26.4	65.7
Total Current Liabilities	557.6	651.4	625.5
Deferred Credits and Other Liabilities:
Deferred income taxes	376.2	364.6	373.7
Pension and postretirement benefit costs	189.3	192.4	137.7
Asset retirement obligations	175.3	173.5	175.9
Regulatory liabilities	345.5	326.5	279.7
Other	52.5	49.2	46.7
Total Deferred Credits and Other Liabilities	1,138.8	1,106.2	1,013.7
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	4,171.1	4,021.9	3,866.2
Spire Alabama
ASSETS
Utility Plant	2,174.1	2,138.0	1,994.5
Less: Accumulated depreciation and amortization	894.2	882.1	841.4
Net Utility Plant	1,279.9	1,255.9	1,153.1
Accounts receivable:
Utility	71.6	37.5	93.9
Associated companies	0.2	0.0	0.0
Other	8.7	8.5	6.3
Allowance for doubtful accounts	(7.4)	(6.3)	(4.2)
Inventories:
Natural gas	30.6	35.1	30.1
Materials and supplies	8.1	7.8	8.2
Regulatory assets	24.4	33.9	18.8
Prepayments	6.6	5.3	4.6
Other	0.4	0.4	2.6
Total Current Assets	143.2	122.2	160.3
Deferred Charges and Other Assets:
Regulatory assets	230.2	231.2	200.2
Deferred income taxes	76.8	81.3	98.3
Other	62.5	53.0	58.4
Total Deferred Charges and Other Assets	369.5	365.5	356.9
Total Assets	1,792.6	1,743.6	1,670.3
Capitalization:
Paid-in capital and common stock	370.9	370.9	390.9
Retained earnings	466.3	459.1	419.6
Total Shareholders' Equity	837.2	830.0	810.5
Long-term debt (less current portion)	471.7	372.2	322.6
Total Capitalization	1,308.9	1,202.2	1,133.1
Current Liabilities:
Current portion of long-term debt	40.0	40.0	0.0
Notes payable – associated companies	67.1	128.7	164.2
Accounts payable	51.9	56.2	78.4
Accounts payable – associated companies	3.2	1.6	2.5
Advance customer billings	10.0	10.6	9.9
Wages and compensation accrued	6.5	8.0	5.8
Customer deposits	20.2	19.5	19.5
Taxes accrued	26.1	27.4	26.6
Regulatory liabilities	2.4	3.4	10.2
Other	13.2	9.2	7.8
Total Current Liabilities	240.6	304.6	324.9
Deferred Credits and Other Liabilities:
Pension and postretirement benefit costs	58.7	59.2	36.2
Asset retirement obligations	150.2	148.7	137.1
Regulatory liabilities	22.3	23.0	30.6
Other	11.9	5.9	8.4
Total Deferred Credits and Other Liabilities	243.1	236.8	212.3
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	$ 1,792.6	$ 1,743.6	$ 1,670.3