CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Utility Plant	$ 5,351.7	$ 5,278.4	$ 4,893.2
Less: Accumulated depreciation and amortization	1,641.0	1,613.2	1,561.4
Net Utility Plant	3,710.7	3,665.2	3,331.8
Non-utility Property (net of accumulated depreciation and amortization of $8.6, $8.6 and $8.2 at December 31, 2017, September 30, 2017, and December 31, 2016, respectively)	105.3	52.0	19.7
Goodwill	1,171.6	1,171.6	1,161.4
Other Investments	66.3	64.2	61.9
Total Other Property and Investments	1,343.2	1,287.8	1,243.0
Current Assets:
Cash and cash equivalents	6.7	7.4	10.6
Accounts receivable:
Utility	333.6	140.5	310.4
Other	135.3	149.2	133.4
Allowance for doubtful accounts	(21.3)	(18.3)	(21.1)
Delayed customer billings	7.5	3.4	5.3
Inventories:
Natural gas	171.6	194.9	161.9
Propane gas	12.0	12.0	12.0
Materials and supplies	21.3	18.9	16.6
Natural gas receivable	3.5	1.9	8.4
Derivative instrument assets	4.7	5.9	18.7
Unamortized purchased gas adjustments	77.9	102.6	52.2
Other regulatory assets	71.4	72.9	82.3
Prepayments and other	28.3	34.2	24.9
Total Current Assets	852.5	725.5	815.6
Deferred Charges:
Regulatory assets	716.6	791.1	786.4
Other	78.1	77.1	133.3
Total Deferred Charges	794.7	868.2	919.7
Total Assets	6,701.1	6,546.7	6,310.1
Capitalization:
Common stock (par value $1.00 per share; 70.0 million shares authorized; 48.3 million, 48.3 million and 45.7 million shares issued and outstanding at December 31, 2017, September 30, 2017 and December 31, 2016, respectively)	48.3	48.3	45.7
Paid-in capital	1,324.9	1,325.6	1,175.7
Retained earnings	703.0	614.2	572.1
Accumulated other comprehensive income	3.0	3.2	3.2
Total Equity	2,079.2	1,991.3	1,796.7
Noncontrolling interest	6.5	0.0	0.0
Total Equity	2,085.7	1,991.3	1,796.7
Long-term debt (less current portion)	2,030.0	1,995.0	1,821.3
Total Capitalization	4,115.7	3,986.3	3,618.0
Current Liabilities:
Current portion of long-term debt	105.5	100.0	250.0
Notes payable	583.6	477.3	506.4
Accounts payable	245.6	257.1	273.8
Advance customer billings	27.3	32.0	60.2
Wages and compensation accrued	29.6	38.7	29.6
Dividends payable	28.1	26.6	24.8
Customer deposits	35.9	34.9	35.7
Interest accrued	26.3	14.6	22.3
Taxes accrued	36.0	61.0	39.7
Unamortized purchased gas adjustments	1.0	1.0	1.4
Regulatory liabilities	20.5	21.6	42.8
Other	71.9	33.1	55.5
Total Current Liabilities	1,211.3	1,097.9	1,342.2
Deferred Credits and Other Liabilities:
Deferred income taxes	441.0	707.5	636.5
Pension and postretirement benefit costs	233.6	237.4	296.3
Asset retirement obligations	299.7	296.6	208.7
Regulatory liabilities	335.1	157.2	132.1
Other	64.7	63.8	76.3
Total Deferred Credits and Other Liabilities	1,374.1	1,462.5	1,349.9
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	6,701.1	6,546.7	6,310.1
Spire Missouri
ASSETS
Utility Plant	3,141.2	3,091.8	2,794.7
Less: Accumulated depreciation and amortization	696.1	681.6	646.4
Net Utility Plant	2,445.1	2,410.2	2,148.3
Goodwill	210.2	210.2	210.2
Other Investments	60.1	59.4	57.1
Total Other Property and Investments	270.3	269.6	267.3
Current Assets:
Cash and cash equivalents	4.1	2.5	4.0
Accounts receivable:
Utility	238.3	101.7	221.0
Associated companies	7.3	3.3	5.3
Other	20.0	15.0	12.2
Allowance for doubtful accounts	(16.8)	(14.1)	(17.1)
Delayed customer billings	7.5	3.4	5.3
Inventories:
Natural gas	127.1	138.2	118.2
Propane gas	12.0	12.0	12.0
Materials and supplies	12.5	11.3	9.3
Derivative instrument assets	0.0	0.1	2.2
Unamortized purchased gas adjustments	38.5	57.4	33.8
Other regulatory assets	38.2	38.2	59.7
Prepayments and other	15.6	19.6	15.5
Total Current Assets	504.3	388.6	481.4
Deferred Charges:
Regulatory assets	484.1	557.8	543.4
Other	5.6	5.3	2.4
Total Deferred Charges	489.7	563.1	545.8
Total Assets	3,709.4	3,631.5	3,442.8
Capitalization:
Paid-in capital and common stock	757.3	756.2	753.1
Retained earnings	492.4	416.5	341.6
Accumulated other comprehensive income	(1.7)	(1.7)	(1.6)
Total Equity	1,248.0	1,171.0	1,093.1
Long-term debt (less current portion)	874.1	873.9	804.3
Total Capitalization	2,122.1	2,044.9	1,897.4
Current Liabilities:
Current portion of long-term debt	100.0	100.0	0.0
Notes payable	0.0	0.0	312.9
Notes payable – associated companies	275.6	203.0	0.0
Accounts payable	73.5	89.9	104.3
Accounts payable – associated companies	8.9	5.4	9.4
Advance customer billings	10.5	13.3	38.8
Wages and compensation accrued	22.9	29.6	22.1
Dividends payable	13.5	0.0	14.7
Customer deposits	13.4	13.3	13.6
Interest accrued	11.6	8.0	9.5
Taxes accrued	12.3	34.1	16.4
Regulatory liabilities	2.7	2.7	2.7
Other	48.4	8.5	35.2
Total Current Liabilities	593.3	507.8	579.6
Deferred Credits and Other Liabilities:
Deferred income taxes	382.2	623.8	578.2
Pension and postretirement benefit costs	167.8	173.0	202.8
Asset retirement obligations	160.3	158.6	76.1
Regulatory liabilities	241.2	81.2	67.3
Other	42.5	42.2	41.4
Total Deferred Credits and Other Liabilities	994.0	1,078.8	965.8
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	3,709.4	3,631.5	3,442.8
Spire Alabama
ASSETS
Utility Plant	1,858.5	1,838.0	1,750.2
Less: Accumulated depreciation and amortization	791.7	782.0	768.0
Net Utility Plant	1,066.8	1,056.0	982.2
Current Assets:
Cash and cash equivalents	0.0	0.1	0.0
Accounts receivable:
Utility	74.7	32.0	77.5
Associated companies	0.7	0.0	0.0
Other	6.6	6.2	6.1
Allowance for doubtful accounts	(2.6)	(2.6)	(2.4)
Inventories:
Natural gas	25.1	33.9	28.4
Materials and supplies	7.6	6.5	6.1
Unamortized purchased gas adjustments	39.4	45.2	17.1
Other regulatory assets	18.6	19.4	14.4
Prepayments and other	7.7	6.7	5.4
Total Current Assets	177.8	147.4	152.6
Deferred Charges:
Regulatory assets	197.4	197.0	229.5
Deferred income taxes	119.0	185.6	215.1
Other	57.4	57.0	61.8
Total Deferred Charges	373.8	439.6	506.4
Total Assets	1,618.4	1,643.0	1,641.2
Capitalization:
Paid-in capital and common stock	420.9	420.9	451.9
Retained earnings	389.4	446.5	419.0
Total Equity	810.3	867.4	870.9
Long-term debt (less current portion)	277.8	247.8	247.7
Total Capitalization	1,088.1	1,115.2	1,118.6
Current Liabilities:
Notes payable	0.0	0.0	102.5
Notes payable – associated companies	163.1	169.9	0.0
Accounts payable	55.0	44.4	48.7
Accounts payable – associated companies	3.8	1.6	1.9
Advance customer billings	16.8	18.6	21.4
Wages and compensation accrued	5.4	7.4	5.7
Customer deposits	18.7	17.9	18.8
Interest accrued	3.5	3.3	3.4
Taxes accrued	22.0	23.4	18.9
Regulatory liabilities	11.3	12.0	37.4
Other	2.4	2.9	5.0
Total Current Liabilities	302.0	301.4	263.7
Deferred Credits and Other Liabilities:
Pension and postretirement benefit costs	51.5	50.2	75.6
Asset retirement obligations	129.7	128.4	121.4
Regulatory liabilities	39.0	39.6	40.6
Other	8.1	8.2	21.3
Total Deferred Credits and Other Liabilities	228.3	226.4	258.9
Total Capitalization and Liabilities	$ 1,618.4	$ 1,643.0	$ 1,641.2