CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017
ASSETS
Utility Plant	$ 5,501.6	$ 5,278.4	$ 5,071.4
Less: Accumulated depreciation and amortization	1,669.8	1,613.2	1,609.6
Net Utility Plant	3,831.8	3,665.2	3,461.8
Non-utility Property (net of accumulated depreciation and amortization of $9.7, $8.6 and $8.4 at June 30, 2018, September 30, 2017, and June 30, 2017, respectively)	143.5	52.0	39.9
Goodwill	1,171.6	1,171.6	1,163.9
Other Investments	71.0	64.2	63.8
Total Other Property and Investments	1,386.1	1,287.8	1,267.6
Current Assets:
Cash and cash equivalents	6.9	7.4	8.3
Accounts receivable:
Utility	159.8	140.5	141.9
Other	111.6	149.2	124.0
Allowance for doubtful accounts	(24.7)	(18.3)	(17.7)
Delayed customer billings	32.8	3.4	7.0
Inventories:
Natural gas	119.8	194.9	144.4
Propane gas	12.0	12.0	12.0
Materials and supplies	21.4	18.9	18.4
Natural gas receivable	2.7	1.9	6.5
Derivative instrument assets	8.4	5.9	7.3
Unamortized purchased gas adjustments	14.6	102.6	73.9
Other regulatory assets	82.1	72.9	70.7
Prepayments and other	37.5	34.2	32.4
Total Current Assets	584.9	725.5	629.1
Deferred Charges:
Regulatory assets	695.1	791.1	840.5
Other	87.0	77.1	99.2
Total Deferred Charges	782.1	868.2	939.7
Total Assets	6,584.9	6,546.7	6,298.2
Capitalization:
Common stock (par value $1.00 per share; 70.0 million shares authorized; 50.7 million, 48.3 million and 48.3 million shares issued and outstanding at June 30, 2018, September 30, 2017 and June 30, 2017, respectively)	50.7	48.3	48.2
Paid-in capital	1,480.2	1,325.6	1,323.7
Retained earnings	772.4	614.2	653.1
Accumulated other comprehensive income	4.4	3.2	3.2
Total Equity	2,307.7	1,991.3	2,028.2
Redeemable noncontrolling interest	6.5	0.0	0.0
Long-term debt (less current portion)	2,024.5	1,995.0	1,925.3
Total Capitalization	4,338.7	3,986.3	3,953.5
Current Liabilities:
Current portion of long-term debt	155.5	100.0	0.0
Notes payable	191.0	477.3	450.7
Accounts payable	195.5	257.1	206.4
Advance customer billings	9.7	32.0	15.9
Wages and compensation accrued	39.6	38.7	38.9
Dividends payable	28.4	26.6	26.3
Customer deposits	35.4	34.9	35.0
Interest accrued	27.8	14.6	24.2
Taxes accrued	56.5	61.0	55.6
Unamortized purchased gas adjustments	1.1	1.0	1.0
Other regulatory liabilities	23.4	21.6	24.9
Other	50.2	33.1	30.9
Total Current Liabilities	814.1	1,097.9	909.8
Deferred Credits and Other Liabilities:
Deferred income taxes	476.8	707.5	705.3
Pension and postretirement benefit costs	219.3	237.4	300.4
Asset retirement obligations	305.9	296.6	214.7
Regulatory liabilities	364.3	157.2	139.8
Other	65.8	63.8	74.7
Total Deferred Credits and Other Liabilities	1,432.1	1,462.5	1,434.9
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	6,584.9	6,546.7	6,298.2
Spire Missouri
ASSETS
Utility Plant	3,227.1	3,091.8	2,914.1
Less: Accumulated depreciation and amortization	697.6	681.6	670.3
Net Utility Plant	2,529.5	2,410.2	2,243.8
Goodwill	210.2	210.2	210.2
Other Investments	56.7	59.4	58.9
Total Other Property and Investments	266.9	269.6	269.1
Current Assets:
Cash and cash equivalents	3.5	2.5	2.6
Accounts receivable:
Utility	110.5	101.7	94.4
Associated companies	3.2	3.3	1.7
Other	18.7	15.0	13.8
Allowance for doubtful accounts	(18.2)	(14.1)	(13.4)
Delayed customer billings	32.8	3.4	7.0
Inventories:
Natural gas	76.8	138.2	93.6
Propane gas	12.0	12.0	12.0
Materials and supplies	12.4	11.3	11.3
Derivative instrument assets	0.0	0.1	0.7
Unamortized purchased gas adjustments	7.0	57.4	29.0
Other regulatory assets	48.1	38.2	38.2
Prepayments and other	20.3	19.6	21.3
Total Current Assets	327.1	388.6	312.2
Deferred Charges:
Regulatory assets	473.8	557.8	583.4
Other	7.7	5.3	3.1
Total Deferred Charges	481.5	563.1	586.5
Total Assets	3,605.0	3,631.5	3,411.6
Capitalization:
Paid-in capital and common stock	759.3	756.2	755.3
Retained earnings	519.8	416.5	414.0
Accumulated other comprehensive income	(1.7)	(1.7)	(1.8)
Total Equity	1,277.4	1,171.0	1,167.5
Long-term debt (less current portion)	824.2	873.9	804.5
Total Capitalization	2,101.6	2,044.9	1,972.0
Current Liabilities:
Current portion of long-term debt	150.0	100.0	0.0
Notes payable – associated companies	128.6	203.0	260.2
Accounts payable	62.3	89.9	54.0
Accounts payable – associated companies	4.9	5.4	5.4
Advance customer billings	0.0	13.3	0.7
Wages and compensation accrued	30.5	29.6	29.4
Dividends payable	9.0	0.0	0.0
Customer deposits	13.0	13.3	13.2
Interest accrued	11.6	8.0	9.5
Taxes accrued	26.5	34.1	28.3
Other regulatory liabilities	8.7	2.7	2.7
Other	17.4	8.5	7.5
Total Current Liabilities	462.5	507.8	410.9
Deferred Credits and Other Liabilities:
Deferred income taxes	393.9	623.8	620.9
Pension and postretirement benefit costs	154.4	173.0	204.2
Asset retirement obligations	163.6	158.6	77.9
Regulatory liabilities	281.6	81.2	83.6
Other	47.4	42.2	42.1
Total Deferred Credits and Other Liabilities	1,040.9	1,078.8	1,028.7
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities	3,605.0	3,631.5	3,411.6
Spire Alabama
ASSETS
Utility Plant	1,920.3	1,838.0	1,809.0
Less: Accumulated depreciation and amortization	816.8	782.0	791.2
Net Utility Plant	1,103.5	1,056.0	1,017.8
Current Assets:
Cash and cash equivalents	0.0	0.1	0.1
Accounts receivable:
Utility	40.3	32.0	40.6
Associated companies	0.2	0.0	0.2
Other	6.5	6.2	5.8
Allowance for doubtful accounts	(3.6)	(2.6)	(2.2)
Inventories:
Natural gas	30.5	33.9	29.0
Materials and supplies	7.7	6.5	5.9
Unamortized purchased gas adjustments	7.6	45.2	44.9
Other regulatory assets	19.3	19.4	17.3
Prepayments and other	8.6	6.7	6.6
Total Current Assets	117.1	147.4	148.2
Deferred Charges:
Regulatory assets	193.4	197.0	228.7
Deferred income taxes	98.2	185.6	181.1
Other	58.6	57.0	63.2
Total Deferred Charges	350.2	439.6	473.0
Total Assets	1,570.8	1,643.0	1,639.0
Capitalization:
Paid-in capital and common stock	390.9	420.9	420.9
Retained earnings	436.3	446.5	463.5
Total Equity	827.2	867.4	884.4
Long-term debt (less current portion)	322.5	247.8	247.7
Total Capitalization	1,149.7	1,115.2	1,132.1
Current Liabilities:
Notes payable – associated companies	69.6	169.9	114.9
Accounts payable	44.6	44.4	45.1
Accounts payable – associated companies	2.0	1.6	1.4
Advance customer billings	9.5	18.6	15.2
Wages and compensation accrued	7.4	7.4	7.5
Customer deposits	18.6	17.9	18.1
Interest accrued	5.0	3.3	3.5
Taxes accrued	26.8	23.4	20.5
Other regulatory liabilities	8.8	12.0	17.8
Other	3.3	2.9	3.4
Total Current Liabilities	195.6	301.4	247.4
Deferred Credits and Other Liabilities:
Pension and postretirement benefit costs	51.8	50.2	77.9
Asset retirement obligations	132.4	128.4	125.4
Regulatory liabilities	33.7	39.6	34.4
Other	7.6	8.2	21.8
Total Deferred Credits and Other Liabilities	225.5	226.4	259.5
Total Capitalization and Liabilities	$ 1,570.8	$ 1,643.0	$ 1,639.0