CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Utility Plant	$ 5,754.8	$ 5,653.3	$ 5,351.7
Less: Accumulated depreciation and amortization	1,709.5	1,682.8	1,641.0
Net Utility Plant	4,045.3	3,970.5	3,710.7
Non-utility Property (net of accumulated depreciation and amortization of $11.1, $10.4 and $8.6 at December 31, 2018, September 30, 2018, and December 31, 2017, respectively)	254.5	174.5	105.3
Goodwill	1,171.6	1,171.6	1,171.6
Other Investments	69.5	68.7	66.3
Total Other Property and Investments	1,495.6	1,414.8	1,343.2
Current Assets:
Cash and cash equivalents	8.4	4.4	6.7
Accounts receivable:
Utility	339.2	151.9	333.6
Other	242.1	167.3	135.3
Allowance for doubtful accounts	(24.6)	(22.4)	(21.3)
Delayed customer billings	10.9	6.9	7.5
Inventories:
Natural gas	176.2	175.2	171.6
Propane gas	12.0	12.0	12.0
Materials and supplies	24.5	23.1	21.3
Natural gas receivable	2.2	1.8	3.5
Derivative instrument assets	19.7	13.3	4.7
Unamortized purchased gas adjustments	3.0	8.2	77.9
Other regulatory assets	60.4	64.6	71.4
Prepayments	25.7	31.0	24.6
Other	5.6	22.3	3.7
Total Current Assets	905.3	659.6	852.5
Deferred Charges and Other Assets:
Regulatory assets	655.1	669.8	716.6
Other	130.9	128.9	78.1
Total Deferred Charges and Other Assets	786.0	798.7	794.7
Total Assets	7,232.2	6,843.6	6,701.1
Capitalization:
Common stock (par value $1.00 per share; 70.0 million shares authorized; 50.7 million, 50.7 million and 48.3 million shares issued and outstanding at December 31, 2018, September 30, 2018 and December 31, 2017, respectively)	50.7	50.7	48.3
Paid-in capital and common stock	1,482.8	1,482.7	1,324.9
Retained earnings	752.9	715.6	703.0
Accumulated other comprehensive (loss) income	(1.8)	6.4	3.0
Total Shareholders' Equity	2,284.6	2,255.4	2,079.2
Redeemable noncontrolling interest	0.0	7.9	6.5
Long-term debt (less current portion)	1,992.0	1,900.1	2,030.0
Total Capitalization	4,276.6	4,163.4	4,115.7
Current Liabilities:
Current portion of long-term debt	175.0	175.5	105.5
Notes payable	626.1	553.6	583.6
Accounts payable	430.9	290.1	245.6
Advance customer billings	19.8	22.7	27.3
Wages and compensation accrued	32.8	39.7	29.6
Dividends payable	31.3	30.0	28.1
Customer deposits	36.1	35.5	35.9
Interest accrued	27.2	15.2	26.3
Taxes accrued	44.6	65.4	36.0
Unamortized purchased gas adjustments	6.1	2.9	1.0
Other regulatory liabilities	30.9	32.8	20.5
Other	102.6	58.3	71.9
Total Current Liabilities	1,563.4	1,321.7	1,211.3
Deferred Credits and Other Liabilities:
Deferred income taxes	453.2	435.8	441.0
Pension and postretirement benefit costs	182.1	180.2	233.6
Asset retirement obligations	324.5	321.1	299.7
Regulatory liabilities	363.4	354.6	335.1
Other	69.0	66.8	64.7
Total Deferred Credits and Other Liabilities	1,392.2	1,358.5	1,374.1
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	7,232.2	6,843.6	6,701.1
Spire Missouri
ASSETS
Utility Plant	3,395.8	3,331.0	3,141.2
Less: Accumulated depreciation and amortization	720.4	705.8	696.1
Net Utility Plant	2,675.4	2,625.2	2,445.1
Goodwill	210.2	210.2	210.2
Other Investments	53.6	55.0	60.1
Total Other Property and Investments	263.8	265.2	270.3
Current Assets:
Cash and cash equivalents	4.9	2.0	4.1
Accounts receivable:
Utility	227.4	103.9	238.3
Associated companies	4.7	2.7	7.3
Other	17.7	16.6	20.0
Allowance for doubtful accounts	(18.1)	(16.0)	(16.8)
Delayed customer billings	10.9	6.9	7.5
Inventories:
Natural gas	129.3	127.9	127.1
Propane gas	12.0	12.0	12.0
Materials and supplies	14.3	13.2	12.5
Unamortized purchased gas adjustments	0.0	1.0	38.5
Other regulatory assets	29.7	29.7	38.2
Prepayments	14.7	19.1	15.6
Total Current Assets	447.5	319.0	504.3
Deferred Charges and Other Assets:
Regulatory assets	427.6	441.1	484.1
Other	51.9	50.8	5.6
Total Deferred Charges and Other Assets	479.5	491.9	489.7
Total Assets	3,866.2	3,701.3	3,709.4
Capitalization:
Paid-in capital and common stock	761.6	760.4	757.3
Retained earnings	542.5	501.1	492.4
Accumulated other comprehensive (loss) income	(1.6)	(1.6)	(1.7)
Total Shareholders' Equity	1,302.5	1,259.9	1,248.0
Long-term debt (less current portion)	924.5	824.4	874.1
Total Capitalization	2,227.0	2,084.3	2,122.1
Current Liabilities:
Current portion of long-term debt	50.0	50.0	100.0
Notes payable – associated companies	308.0	345.3	275.6
Accounts payable	101.5	81.7	73.5
Accounts payable – associated companies	17.4	5.8	8.9
Advance customer billings	9.1	9.5	10.5
Wages and compensation accrued	25.3	31.3	22.9
Dividends payable	0.0	9.0	13.5
Customer deposits	13.3	13.1	13.4
Interest accrued	11.2	7.8	11.6
Taxes accrued	14.6	32.0	12.3
Unamortized purchased gas adjustments	5.8	1.9	0.0
Other regulatory liabilities	14.8	14.8	2.7
Other	54.5	20.1	48.4
Total Current Liabilities	625.5	622.3	593.3
Deferred Credits and Other Liabilities:
Deferred income taxes	373.7	361.0	382.2
Pension and postretirement benefit costs	137.7	136.9	167.8
Asset retirement obligations	175.9	174.1	160.3
Regulatory liabilities	279.7	274.9	241.2
Other	46.7	47.8	42.5
Total Deferred Credits and Other Liabilities	1,013.7	994.7	994.0
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	3,866.2	3,701.3	3,709.4
Spire Alabama
ASSETS
Utility Plant	1,994.5	1,964.3	1,858.5
Less: Accumulated depreciation and amortization	841.4	830.2	791.7
Net Utility Plant	1,153.1	1,134.1	1,066.8
Current Assets:
Cash and cash equivalents	0.0	0.0	0.0
Accounts receivable:
Utility	93.9	39.6	74.7
Associated companies	0.0	0.5	0.7
Other	6.3	8.5	6.6
Allowance for doubtful accounts	(4.2)	(3.9)	(2.6)
Inventories:
Natural gas	30.1	33.9	25.1
Materials and supplies	8.2	7.8	7.6
Unamortized purchased gas adjustments	1.6	6.4	39.4
Other regulatory assets	17.2	19.8	18.6
Prepayments	4.6	6.0	5.7
Other	2.6	2.4	2.0
Total Current Assets	160.3	121.0	177.8
Deferred Charges and Other Assets:
Regulatory assets	200.2	201.5	197.4
Deferred income taxes	98.3	101.8	119.0
Other	58.4	57.8	57.4
Total Deferred Charges and Other Assets	356.9	361.1	373.8
Total Assets	1,670.3	1,616.2	1,618.4
Capitalization:
Paid-in capital and common stock	390.9	390.9	420.9
Retained earnings	419.6	417.8	389.4
Total Shareholders' Equity	810.5	808.7	810.3
Long-term debt (less current portion)	322.6	322.6	277.8
Total Capitalization	1,133.1	1,131.3	1,088.1
Current Liabilities:
Notes payable – associated companies	164.2	142.5	163.1
Accounts payable	78.4	48.4	55.0
Accounts payable – associated companies	2.5	2.1	3.8
Advance customer billings	9.9	13.1	16.8
Wages and compensation accrued	5.8	6.7	5.4
Customer deposits	19.5	18.6	18.7
Interest accrued	4.8	3.9	3.5
Taxes accrued	26.6	28.3	22.0
Other regulatory liabilities	10.2	7.6	11.3
Other	3.0	3.2	2.4
Total Current Liabilities	324.9	274.4	302.0
Deferred Credits and Other Liabilities:
Pension and postretirement benefit costs	36.2	35.0	51.5
Asset retirement obligations	137.1	135.7	129.7
Regulatory liabilities	30.6	31.3	39.0
Other	8.4	8.5	8.1
Total Deferred Credits and Other Liabilities	212.3	210.5	228.3
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	$ 1,670.3	$ 1,616.2	$ 1,618.4