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Interim Financial Information (Unaudited) (Tables) | 12 Months Ended
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Sep. 30, 2020
Quarterly Financial Information [Line Items] |
Schedule of Quarterly Financial Information |
Three Months Ended |  | Dec. 31 |  |  | March 31 |  |  | June 30 |  |  | Sept. 30 |
Fiscal Year 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  | $ | 566.9 |  |  | $ | 715.5 |  |  | $ | 321.1 |  |  | $ | 251.9 |
Operating Income (Loss) |  |  | 102.3 |  |  |  | 210.5 |  |  |  | (106.5 | ) |  |  | 0.1 |
Net Income (Loss) |  |  | 67.0 |  |  |  | 133.6 |  |  |  | (92.3 | ) |  |  | (19.7 | )
Basic Earnings (Loss) Per Share of Common Stock |  | $ | 1.24 |  |  | $ | 2.55 |  |  | $ | (1.87 | ) |  | $ | (0.45 | )
Diluted Earnings (Loss) Per Share of Common Stock |  | $ | 1.24 |  |  | $ | 2.54 |  |  | $ | (1.87 | ) |  | $ | (0.45 | )
Fiscal Year 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  | $ | 602.0 |  |  | $ | 803.5 |  |  | $ | 321.3 |  |  | $ | 225.6 |
Operating Income (Loss) |  |  | 105.1 |  |  |  | 209.5 |  |  |  | 13.3 |  |  |  | (25.6 | )
Net Income (Loss) |  |  | 67.3 |  |  |  | 154.6 |  |  |  | (3.0 | ) |  |  | (34.3 | )
Basic Earnings (Loss) Per Share of Common Stock |  | $ | 1.33 |  |  | $ | 3.05 |  |  | $ | (0.09 | ) |  | $ | (0.75 | )
Diluted Earnings (Loss) Per Share of Common Stock |  | $ | 1.32 |  |  | $ | 3.04 |  |  | $ | (0.09 | ) |  | $ | (0.74 | )
Spire Missouri |
Quarterly Financial Information [Line Items] |
Schedule of Quarterly Financial Information |
Three Months Ended |  | Dec. 31 |  |  | March 31 |  |  | June 30 |  |  | Sept. 30 |
Fiscal Year 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  | $ | 374.0 |  |  | $ | 457.5 |  |  | $ | 203.9 |  |  | $ | 158.2 |
Operating Income |  |  | 67.0 |  |  |  | 117.7 |  |  |  | 7.0 |  |  |  | 13.9 |
Net Income |  |  | 48.0 |  |  |  | 74.5 |  |  |  | 6.5 |  |  |  | 1.2 |
Fiscal Year 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  | $ | 413.2 |  |  | $ | 556.6 |  |  | $ | 191.4 |  |  | $ | 130.6 |
Operating Income (Loss) |  |  | 71.4 |  |  |  | 102.4 |  |  |  | 12.2 |  |  |  | (11.2 | )
Net Income (Loss) |  |  | 51.2 |  |  |  | 80.0 |  |  |  | 1.1 |  |  |  | (17.3 | )
Spire Alabama |
Quarterly Financial Information [Line Items] |
Schedule of Quarterly Financial Information |
Three Months Ended |  | Dec. 31 |  |  | March 31 |  |  | June 30 |  |  | Sept. 30 |
Fiscal Year 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  | $ | 126.2 |  |  | $ | 185.5 |  |  | $ | 81.2 |  |  | $ | 62.1 |
Operating Income (Loss) |  |  | 20.9 |  |  |  | 81.2 |  |  |  | 9.3 |  |  |  | (8.5 | )
Net Income (Loss) |  |  | 13.2 |  |  |  | 57.8 |  |  |  | 3.6 |  |  |  | (8.9 | )
Fiscal Year 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues |  | $ | 133.5 |  |  | $ | 180.4 |  |  | $ | 90.8 |  |  | $ | 60.8 |
Operating Income (Loss) |  |  | 17.1 |  |  |  | 79.6 |  |  |  | 11.1 |  |  |  | (12.3 | )
Net Income (Loss) |  |  | 10.3 |  |  |  | 56.7 |  |  |  | 5.6 |  |  |  | (12.3 | )

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