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INFORMATION BY OPERATING SEGMENT - Schedule of Operating Segment Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) reporting_unit | Dec. 31, 2015 USD ($) | Sep. 30, 2016 USD ($)
Segment Reporting [Abstract] |  |  |
Number of operating segments | reporting_unit | 2 |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | $ 495.1 | $ 399.4 |
Total Operating Revenues | 495.1 | 399.4 |
Gas Utility |  |  |
Natural and propane gas | 193.8 | 148.5 |
Other operation and maintenance expenses | 99.4 | 91.6 |
Depreciation and amortization | 37.7 | 33.5 |
Taxes, other than income taxes | 33.4 | 28.2 |
Total Gas Utility Operating Expenses | 364.3 | 301.8 |
Gas Marketing and Other | 41.7 | 10.6 |
Total Operating Expenses | 406.0 | 312.4 |
Operating Income | 89.1 | 87.0 |
Net Economic Earnings (Loss) | 47.5 | 45.1 |
ASSETS |  |  |
Total Assets | 6,310.1 | 5,398.8 | $ 6,064.4
Intersegment revenues |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 0.0 | 0.0 |
Other |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 1.1 | 0.4 |
Total Operating Revenues | 1.8 | 0.8 |
Gas Utility |  |  |
Natural and propane gas | 0.0 | 0.0 |
Other operation and maintenance expenses | 0.0 | 0.0 |
Depreciation and amortization | 0.0 | 0.0 |
Taxes, other than income taxes | 0.0 | 0.0 |
Total Gas Utility Operating Expenses | 0.0 | 0.0 |
Gas Marketing and Other | 2.0 | 1.6 |
Total Operating Expenses | 2.0 | 1.6 |
Operating Income | (0.2) | (0.8) |
Net Economic Earnings (Loss) | (5.7) | (4.6) |
ASSETS |  |  |
Total Assets | 1,848.7 | 1,545.5 | 1,836.6
Other | Intersegment revenues |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 0.7 | 0.4 |
Eliminations |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 0.0 | 0.0 |
Total Operating Revenues | (5.1) | (13.7) |
Gas Utility |  |  |
Natural and propane gas | (20.7) | (13.4) |
Other operation and maintenance expenses | (1.1) | (0.3) |
Depreciation and amortization | 0.0 | 0.0 |
Taxes, other than income taxes | 0.0 | 0.0 |
Total Gas Utility Operating Expenses | (21.8) | (13.7) |
Gas Marketing and Other | 16.7 | 0.0 |
Total Operating Expenses | (5.1) | (13.7) |
Operating Income | 0.0 | 0.0 |
Net Economic Earnings (Loss) | 0.0 | 0.0 |
ASSETS |  |  |
Total Assets | (1,139.2) | (1,109.5) | (1,161.9)
Eliminations | Intersegment revenues |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | (5.1) | (13.7) |
Gas Utility | Operating Segments |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 472.3 | 398.8 |
Total Operating Revenues | 476.7 | 399.5 |
Gas Utility |  |  |
Natural and propane gas | 214.5 | 161.9 |
Other operation and maintenance expenses | 100.5 | 91.9 |
Depreciation and amortization | 37.7 | 33.5 |
Taxes, other than income taxes | 33.4 | 28.2 |
Total Gas Utility Operating Expenses | 386.1 | 315.5 |
Gas Marketing and Other | 0.0 | 0.0 |
Total Operating Expenses | 386.1 | 315.5 |
Operating Income | 90.6 | 84.0 |
Net Economic Earnings (Loss) | 51.8 | 50.0 |
ASSETS |  |  |
Total Assets | 5,375.6 | 4,799.0 | 5,184.7
Gas Utility | Operating Segments | Intersegment revenues |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 4.4 | 0.7 |
Gas Marketing | Operating Segments |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 21.7 | 0.2 |
Total Operating Revenues | 21.7 | 12.8 |
Gas Utility |  |  |
Natural and propane gas | 0.0 | 0.0 |
Other operation and maintenance expenses | 0.0 | 0.0 |
Depreciation and amortization | 0.0 | 0.0 |
Taxes, other than income taxes | 0.0 | 0.0 |
Total Gas Utility Operating Expenses | 0.0 | 0.0 |
Gas Marketing and Other | 23.0 | 9.0 |
Total Operating Expenses | 23.0 | 9.0 |
Operating Income | (1.3) | 3.8 |
Net Economic Earnings (Loss) | 1.4 | (0.3) |
ASSETS |  |  |
Total Assets | 225.0 | 163.8 | $ 205.0
Gas Marketing | Operating Segments | Intersegment revenues |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | $ 0.0 | $ 12.6 |

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- Definition Net economic earnings exclude from reported net income the after-tax impact of net unrealized gains and losses and other timing differences associated with energy-related transactions. Net economic earnings will also exclude, if applicable, the after-tax impact of costs related to acquisition, divestiture, and restructuring activities. + References No definition available. + Details
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