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v3.20.2

Information by Operating Segment - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 251.9 | $ 321.1 | $ 715.5 | $ 566.9 | $ 225.6 | $ 321.3 | $ 803.5 | $ 602.0 | $ 1,855.4 | $ 1,952.4 | $ 1,965.0
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  |  |  |  |  |  |  | 696.1 | 840.3 | 871.7
Other operation and maintenance |  |  |  |  |  |  |  |  | 458.6 | 474.1 | 477.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 197.3 | 181.7 | 168.4
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 148.4 | 154.0 | 153.5
Impairments |  |  |  |  |  |  |  |  | 148.6 | 0.0 | 0.0
Total Operating Expenses |  |  |  |  |  |  |  |  | 1,649.0 | 1,650.1 | 1,670.9
Operating Income | 0.1 | $ (106.5) | $ 210.5 | $ 102.3 | (25.6) | $ 13.3 | $ 209.5 | $ 105.1 | 206.4 | 302.3 | 294.1
Net Economic Earnings (Loss) |  |  |  |  |  |  |  |  | 207.8 | 195.1 | 183.7
Capital Expenditures |  |  |  |  |  |  |  |  | 638.4 | 823.3 | 499.4
Total Assets | 8,241.2 |  |  |  | 7,619.2 |  |  |  | 8,241.2 | 7,619.2 | 6,843.6
Eliminations |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | (42.3) | (13.6) | (11.5)
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  |  |  |  |  |  |  | (29.6) | (2.7) | (1.4)
Other operation and maintenance |  |  |  |  |  |  |  |  | (12.7) | (10.9) | (10.1)
Total Operating Expenses |  |  |  |  |  |  |  |  | (42.3) | (13.6) | (11.5)
Total Assets | (1,101.2) |  |  |  | (1,380.4) |  |  |  | (1,101.2) | (1,380.4) | (1,566.4)
Gas Utility |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 1,751.8 | 1,859.2 | 1,888.0
Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 1,752.0 | 1,860.8 | 1,888.4
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  |  |  |  |  |  |  | 660.2 | 794.6 | 842.6
Other operation and maintenance |  |  |  |  |  |  |  |  | 421.3 | 441.7 | 449.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 189.7 | 179.4 | 167.0
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 146.5 | 151.7 | 152.5
Total Operating Expenses |  |  |  |  |  |  |  |  | 1,417.7 | 1,567.4 | 1,611.8
Operating Income |  |  |  |  |  |  |  |  | 334.3 | 293.4 | 276.6
Net Economic Earnings (Loss) |  |  |  |  |  |  |  |  | 213.4 | 199.8 | 183.1
Capital Expenditures |  |  |  |  |  |  |  |  | 547.8 | 565.4 | 457.7
Total Assets | 6,716.2 |  |  |  | 6,094.6 |  |  |  | 6,716.2 | 6,094.6 | 5,606.7
Gas Utility | Eliminations |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0.2 | 1.6 | 0.4
Gas Marketing |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 87.9 | 83.7 | 71.6
Gas Marketing | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 87.9 | 83.7 | 71.6
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  |  |  |  |  |  |  | 65.1 | 47.9 | 30.2
Other operation and maintenance |  |  |  |  |  |  |  |  | 11.8 | 11.7 | 7.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.6 | 0.1 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 1.1 | 0.8 | 0.2
Total Operating Expenses |  |  |  |  |  |  |  |  | 78.6 | 60.5 | 37.8
Operating Income |  |  |  |  |  |  |  |  | 9.3 | 23.2 | 33.8
Net Economic Earnings (Loss) |  |  |  |  |  |  |  |  | 9.1 | 19.4 | 22.9
Capital Expenditures |  |  |  |  |  |  |  |  | 3.6 | 3.1 |
Total Assets | 182.7 |  |  |  | 212.3 |  |  |  | 182.7 | 212.3 | 295.3
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 15.7 | 9.5 | 5.4
Corporate, Non-Segment | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 57.8 | 21.5 | 16.5
Operating Expenses: |  |  |  |  |  |  |  |  |  |  |
Natural gas |  |  |  |  |  |  |  |  | 0.4 | 0.5 | 0.3
Other operation and maintenance |  |  |  |  |  |  |  |  | 38.2 | 31.6 | 30.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 7.0 | 2.2 | 1.4
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 0.8 | 1.5 | 0.8
Impairments |  |  |  |  |  |  |  |  | 148.6 |  |
Total Operating Expenses |  |  |  |  |  |  |  |  | 195.0 | 35.8 | 32.8
Operating Income |  |  |  |  |  |  |  |  | (137.2) | (14.3) | (16.3)
Net Economic Earnings (Loss) |  |  |  |  |  |  |  |  | (14.7) | (24.1) | (22.3)
Capital Expenditures |  |  |  |  |  |  |  |  | 87.0 | 254.8 | 41.7
Total Assets | $ 2,443.5 |  |  |  | $ 2,692.7 |  |  |  | 2,443.5 | 2,692.7 | 2,508.0
Corporate, Non-Segment | Eliminations |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 42.1 | $ 12.0 | $ 11.1

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