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v3.21.1

Information by Operating Segment - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Operating Segment Information [Abstract] |  |  |  |  |
Revenues from external customers | $ 1,104.9 | $ 715.5 | $ 1,617.5 | $ 1,282.4 |
Total operating revenues | 1,104.9 | 715.5 | 1,617.5 | 1,282.4 |
Operating Expenses: |  |  |  |  |
Natural gas | 619.1 | 297.1 | 800.3 | 559.0 |
Operation and maintenance | 119.0 | 105.7 | 230.6 | 222.3 |
Depreciation and amortization | 51.5 | 49.2 | 102.3 | 96.7 |
Taxes, other than income taxes | 57.9 | 53.0 | 94.0 | 91.6 |
Total Operating Expenses | 847.5 | 505.0 | 1,227.2 | 969.6 |
Net Economic Earnings (Loss) | 195.6 | 144.0 | 272.5 | 215.8 |
Operating Income | 257.4 | 210.5 | 390.3 | 312.8 |
Total Assets | 8,936.8 | 8,018.0 | 8,936.8 | 8,018.0 | $ 8,241.2
Eliminations |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |
Total operating revenues | 2.8 | (11.5) | (24.3) | (18.7) |
Operating Expenses: |  |  |  |  |
Natural gas | 6.0 | (8.2) | (17.8) | (12.4) |
Operation and maintenance | (3.2) | (3.3) | (6.5) | (6.3) |
Depreciation and amortization | 0.0 | 0.0 | 0.0 | 0.0 |
Taxes, other than income taxes | 0.0 | 0.0 | 0.0 | 0.0 |
Total Operating Expenses | 2.8 | (11.5) | (24.3) | (18.7) |
Net Economic Earnings (Loss) | 0.0 | 0.0 | 0.0 | 0.0 |
Operating Income | 0.0 | 0.0 | 0.0 | 0.0 |
Total Assets | (1,182.9) | (667.6) | (1,182.9) | (667.6) | (1,101.2)
Other |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |
Revenues from external customers | 4.5 | 3.1 | 9.2 | 7.1 |
Intersegment revenues | 11.1 | 11.6 | 23.1 | 18.7 |
Total operating revenues | 15.6 | 14.7 | 32.3 | 25.8 |
Operating Expenses: |  |  |  |  |
Natural gas | 0.1 | 0.1 | 0.1 | 0.2 |
Operation and maintenance | 11.1 | 9.6 | 19.7 | 17.5 |
Depreciation and amortization | 1.7 | 2.1 | 3.6 | 3.2 |
Taxes, other than income taxes | 1.0 | 0.9 | 1.4 | 1.3 |
Total Operating Expenses | 13.9 | 12.7 | 24.8 | 22.2 |
Net Economic Earnings (Loss) | (3.9) | (5.4) | (6.7) | (8.8) |
Operating Income | 1.7 | 2.0 | 7.5 | 3.6 |
Total Assets | 2,513.7 | 2,214.7 | 2,513.7 | 2,214.7 | 2,443.5
Gas Utility |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |
Revenues from external customers | 1,053.0 | 679.1 | 1,550.2 | 1,209.7 |
Intersegment revenues | 0.1 | (0.1) | 1.1 | 0.0 |
Gas Utility | Operating Segments |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |
Total operating revenues | 1,053.1 | 679.0 | 1,551.3 | 1,209.7 |
Operating Expenses: |  |  |  |  |
Natural gas | 619.2 | 271.6 | 823.5 | 513.1 |
Operation and maintenance | 104.0 | 95.8 | 207.0 | 204.4 |
Depreciation and amortization | 49.5 | 47.0 | 98.1 | 93.4 |
Taxes, other than income taxes | 56.4 | 51.7 | 91.9 | 89.6 |
Total Operating Expenses | 829.1 | 466.1 | 1,220.5 | 900.5 |
Net Economic Earnings (Loss) | 159.7 | 144.3 | 236.1 | 213.4 |
Operating Income | 224.0 | 212.9 | 330.8 | 309.2 |
Total Assets | 7,265.0 | 6,311.6 | 7,265.0 | 6,311.6 | 6,716.2
Gas Marketing |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |
Revenues from external customers | 47.4 | 33.3 | 58.1 | 65.6 |
Intersegment revenues | (14.0) | 0.0 | 0.1 | 0.0 |
Gas Marketing | Operating Segments |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |
Total operating revenues | 33.4 | 33.3 | 58.2 | 65.6 |
Operating Expenses: |  |  |  |  |
Natural gas | (6.2) | 33.6 | (5.5) | 58.1 |
Operation and maintenance | 7.1 | 3.6 | 10.4 | 6.7 |
Depreciation and amortization | 0.3 | 0.1 | 0.6 | 0.1 |
Taxes, other than income taxes | 0.5 | 0.4 | 0.7 | 0.7 |
Total Operating Expenses | 1.7 | 37.7 | 6.2 | 65.6 |
Net Economic Earnings (Loss) | 39.8 | 5.1 | 43.1 | 11.2 |
Operating Income | 31.7 | (4.4) | 52.0 | 0.0 |
Total Assets | $ 341.0 | $ 159.3 | $ 341.0 | $ 159.3 | $ 182.7

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