CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions |
Jun. 30, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
| ASSETS |
|
|
|
| Utility Plant |
$ 12,032.6
|
$ 9,330.4
|
$ 9,232.8
|
| Less: Accumulated depreciation and amortization |
3,107.9
|
2,577.4
|
2,571.8
|
| Net Utility Plant |
8,924.7
|
6,753.0
|
6,661.0
|
| Non-utility Property (net of accumulated depreciation and amortization of $124.7, $106.6 and $100.5 at June 30, 2026, September 30, 2025, and June 30, 2025, respectively) |
553.4
|
568.1
|
572.3
|
| Other Investments |
131.8
|
126.6
|
124.1
|
| Total Other Property and Investments |
685.2
|
694.7
|
696.4
|
| Current Assets: |
|
|
|
| Cash and cash equivalents |
20.7
|
5.7
|
13.1
|
| Accounts receivable: |
|
|
|
| Utility |
228.8
|
191.9
|
228.0
|
| Other |
47.1
|
47.2
|
46.1
|
| Allowance for credit losses |
(30.4)
|
(28.8)
|
(33.8)
|
| Delayed customer billings |
29.5
|
13.6
|
18.3
|
| Inventories: |
|
|
|
| Natural gas |
155.7
|
192.8
|
133.0
|
| Propane gas |
8.6
|
8.6
|
8.6
|
| Materials and supplies |
45.4
|
47.0
|
46.5
|
| Regulatory assets |
78.6
|
78.3
|
35.0
|
| Prepayments |
63.6
|
46.1
|
58.7
|
| Other |
60.9
|
22.8
|
26.7
|
| Assets held for sale |
81.4
|
182.7
|
199.9
|
| Total Current Assets |
789.9
|
807.9
|
780.1
|
| Deferred Charges and Other Assets: |
|
|
|
| Goodwill |
1,895.2
|
1,171.6
|
1,171.6
|
| Regulatory assets |
1,395.0
|
1,323.5
|
1,293.4
|
| Other |
401.4
|
378.7
|
347.7
|
| Assets held for sale |
0.0
|
445.9
|
446.1
|
| Total Deferred Charges and Other Assets |
3,691.6
|
3,319.7
|
3,258.8
|
| Total Assets |
14,091.4
|
11,575.3
|
11,396.3
|
| Capitalization: |
|
|
|
| Common stock (par value $1.00 per share; 70.0 million shares authorized; 59.1 million, 59.0 million, and 59.0 million shares issued and outstanding at June 30, 2026, September 30, 2025, and June 30, 2025, respectively) |
59.1
|
59.0
|
59.0
|
| Paid-in capital |
1,984.9
|
1,981.4
|
1,979.2
|
| Retained earnings |
1,515.9
|
1,087.6
|
1,179.5
|
| Accumulated other comprehensive income (loss) |
23.1
|
19.4
|
20.5
|
| Total Shareholders' Equity |
3,583.0
|
3,389.4
|
3,480.2
|
| Temporary equity |
4.4
|
6.1
|
5.2
|
| Long-term debt (less current portion) |
5,758.0
|
3,369.4
|
3,498.4
|
| Total Capitalization |
9,345.4
|
6,764.9
|
6,983.8
|
| Current Liabilities: |
|
|
|
| Current portion of long-term debt |
238.1
|
487.5
|
392.5
|
| Notes payable |
1,263.5
|
1,317.0
|
1,009.5
|
| Accounts payable |
194.4
|
156.3
|
140.2
|
| Advance customer billings |
17.0
|
58.1
|
29.4
|
| Wages and compensation accrued |
41.4
|
49.2
|
35.4
|
| Customer deposits |
38.8
|
32.8
|
32.6
|
| Taxes accrued |
100.9
|
107.5
|
90.8
|
| Regulatory liabilities |
11.3
|
39.4
|
48.6
|
| Other |
219.2
|
176.5
|
175.1
|
| Liabilities associated with assets held for sale |
7.9
|
124.2
|
132.4
|
| Total Current Liabilities |
2,132.5
|
2,548.5
|
2,086.5
|
| Deferred Credits and Other Liabilities: |
|
|
|
| Deferred income taxes |
1,054.6
|
887.4
|
900.5
|
| Pension and postretirement benefit costs |
43.1
|
74.7
|
105.0
|
| Asset retirement obligations |
596.9
|
577.7
|
593.0
|
| Regulatory liabilities |
777.6
|
578.0
|
582.0
|
| Other |
141.3
|
136.7
|
138.4
|
| Liabilities associated with assets held for sale |
0.0
|
7.4
|
7.1
|
| Total Deferred Credits and Other Liabilities |
2,613.5
|
2,261.9
|
2,326.0
|
| Commitments and Contingencies (Note 13) |
|
|
|
| Total Capitalization and Liabilities |
14,091.4
|
11,575.3
|
11,396.3
|
| Depositary Shares [Member] |
|
|
|
| Capitalization: |
|
|
|
| Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at September 30, 2025 and June 30, 2025) |
0.0
|
242.0
|
242.0
|
| Spire Missouri [Member] |
|
|
|
| ASSETS |
|
|
|
| Utility Plant |
6,246.9
|
5,864.3
|
5,793.3
|
| Less: Accumulated depreciation and amortization |
1,190.9
|
1,104.6
|
1,089.8
|
| Net Utility Plant |
5,056.0
|
4,759.7
|
4,703.5
|
| Total Other Property and Investments |
76.7
|
75.8
|
73.6
|
| Accounts receivable: |
|
|
|
| Other |
26.3
|
34.0
|
33.0
|
| Allowance for credit losses |
(22.9)
|
(23.0)
|
(27.9)
|
| Delayed customer billings |
25.3
|
4.2
|
14.2
|
| Inventories: |
|
|
|
| Natural gas |
100.6
|
150.0
|
99.1
|
| Propane gas |
8.6
|
8.6
|
8.6
|
| Materials and supplies |
23.5
|
24.5
|
23.4
|
| Regulatory assets |
7.7
|
48.9
|
8.7
|
| Prepayments |
39.2
|
28.2
|
37.3
|
| Other |
0.5
|
0.0
|
0.0
|
| Total Current Assets |
368.1
|
426.7
|
363.6
|
| Deferred Charges and Other Assets: |
|
|
|
| Goodwill |
210.2
|
210.2
|
210.2
|
| Regulatory assets |
669.2
|
653.2
|
613.5
|
| Other |
198.7
|
224.2
|
194.6
|
| Total Deferred Charges and Other Assets |
1,078.1
|
1,087.6
|
1,018.3
|
| Total Assets |
6,578.9
|
6,349.8
|
6,159.0
|
| Capitalization: |
|
|
|
| Paid-in capital and common stock |
929.3
|
929.3
|
929.3
|
| Retained earnings |
1,424.4
|
1,239.1
|
1,264.1
|
| Accumulated other comprehensive income (loss) |
(0.6)
|
(0.7)
|
(1.3)
|
| Total Shareholders' Equity |
2,353.1
|
2,167.7
|
2,192.1
|
| Long-term debt (less current portion) |
2,153.6
|
1,953.6
|
1,953.2
|
| Total Capitalization |
4,506.7
|
4,121.3
|
4,145.3
|
| Current Liabilities: |
|
|
|
| Advance customer billings |
7.7
|
43.2
|
19.1
|
| Wages and compensation accrued |
21.0
|
27.0
|
19.8
|
| Customer deposits |
7.2
|
7.2
|
7.0
|
| Taxes accrued |
57.2
|
65.8
|
53.0
|
| Regulatory liabilities |
3.5
|
13.9
|
14.0
|
| Other |
62.3
|
64.3
|
51.6
|
| Total Current Liabilities |
692.7
|
908.0
|
663.9
|
| Deferred Credits and Other Liabilities: |
|
|
|
| Deferred income taxes |
651.4
|
598.7
|
603.6
|
| Pension and postretirement benefit costs |
42.7
|
72.4
|
85.0
|
| Asset retirement obligations |
98.5
|
95.5
|
98.6
|
| Regulatory liabilities |
509.5
|
481.3
|
491.1
|
| Other |
77.4
|
72.6
|
71.5
|
| Total Deferred Credits and Other Liabilities |
1,379.5
|
1,320.5
|
1,349.8
|
| Commitments and Contingencies (Note 13) |
|
|
|
| Total Capitalization and Liabilities |
6,578.9
|
6,349.8
|
6,159.0
|
| Spire Missouri [Member] | Nonrelated Party [Member] |
|
|
|
| Accounts receivable: |
|
|
|
| Utility |
157.3
|
149.1
|
164.9
|
| Current Liabilities: |
|
|
|
| Accounts payable |
80.2
|
98.9
|
90.8
|
| Spire Missouri [Member] | Related Party [Member] |
|
|
|
| Accounts receivable: |
|
|
|
| Utility |
2.0
|
2.2
|
2.3
|
| Current Liabilities: |
|
|
|
| Notes payable |
443.5
|
566.3
|
398.7
|
| Accounts payable |
10.1
|
21.4
|
9.9
|
| Spire Alabama Inc [Member] |
|
|
|
| ASSETS |
|
|
|
| Utility Plant |
3,173.7
|
3,052.9
|
3,042.8
|
| Less: Accumulated depreciation and amortization |
1,416.9
|
1,362.4
|
1,370.8
|
| Net Utility Plant |
1,756.8
|
1,690.5
|
1,672.0
|
| Total Other Property and Investments |
0.1
|
0.1
|
0.1
|
| Current Assets: |
|
|
|
| Cash and cash equivalents |
2.8
|
1.9
|
1.7
|
| Accounts receivable: |
|
|
|
| Other |
5.9
|
6.9
|
6.2
|
| Allowance for credit losses |
(4.9)
|
(4.9)
|
(5.1)
|
| Delayed customer billings |
3.9
|
9.0
|
3.9
|
| Inventories: |
|
|
|
| Natural gas |
43.8
|
39.4
|
31.1
|
| Materials and supplies |
18.8
|
19.0
|
19.3
|
| Regulatory assets |
25.8
|
16.1
|
13.2
|
| Prepayments |
8.8
|
7.7
|
9.4
|
| Other |
0.2
|
0.0
|
0.0
|
| Total Current Assets |
150.2
|
129.9
|
133.3
|
| Deferred Charges and Other Assets: |
|
|
|
| Regulatory assets |
667.6
|
650.6
|
659.6
|
| Other |
100.6
|
99.2
|
94.8
|
| Total Deferred Charges and Other Assets |
768.2
|
749.8
|
754.4
|
| Total Assets |
2,675.3
|
2,570.3
|
2,559.8
|
| Capitalization: |
|
|
|
| Paid-in capital and common stock |
236.3
|
242.9
|
242.9
|
| Retained earnings |
790.3
|
735.2
|
745.1
|
| Total Shareholders' Equity |
1,026.6
|
978.1
|
988.0
|
| Long-term debt (less current portion) |
712.0
|
711.7
|
711.6
|
| Total Capitalization |
1,738.6
|
1,689.8
|
1,699.6
|
| Current Liabilities: |
|
|
|
| Current portion of long-term debt |
0.0
|
0.0
|
35.0
|
| Advance customer billings |
8.1
|
13.1
|
8.4
|
| Wages and compensation accrued |
6.2
|
7.8
|
5.6
|
| Customer deposits |
23.7
|
22.3
|
22.3
|
| Taxes accrued |
30.2
|
33.1
|
30.6
|
| Regulatory liabilities |
1.9
|
20.3
|
29.3
|
| Other |
12.4
|
14.6
|
11.9
|
| Total Current Liabilities |
302.1
|
290.0
|
248.1
|
| Deferred Credits and Other Liabilities: |
|
|
|
| Deferred income taxes |
97.1
|
64.1
|
65.9
|
| Pension and postretirement benefit costs |
0.2
|
2.4
|
11.1
|
| Asset retirement obligations |
485.4
|
470.0
|
483.9
|
| Regulatory liabilities |
28.0
|
29.2
|
25.8
|
| Other |
23.9
|
24.8
|
25.4
|
| Total Deferred Credits and Other Liabilities |
634.6
|
590.5
|
612.1
|
| Total Capitalization and Liabilities |
2,675.3
|
2,570.3
|
2,559.8
|
| Spire Alabama Inc [Member] | Nonrelated Party [Member] |
|
|
|
| Accounts receivable: |
|
|
|
| Utility |
45.0
|
34.8
|
53.5
|
| Current Liabilities: |
|
|
|
| Accounts payable |
45.5
|
43.3
|
43.6
|
| Spire Alabama Inc [Member] | Related Party [Member] |
|
|
|
| Accounts receivable: |
|
|
|
| Utility |
0.1
|
|
0.1
|
| Current Liabilities: |
|
|
|
| Notes payable |
168.2
|
130.1
|
56.4
|
| Accounts payable |
$ 5.9
|
$ 5.4
|
$ 5.0
|