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INFORMATION BY OPERATING SEGMENT - Schedule of Operating Segment Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) reporting_unit | Dec. 31, 2016 USD ($) | Sep. 30, 2017 USD ($)
Segment Reporting [Abstract] |  |  |
Number of operating segments | reporting_unit | 2 |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | $ 561.8 | $ 495.1 |
Total Operating Revenues | 561.8 | 495.1 |
Gas Utility |  |  |
Natural and propane gas | 240.8 | 193.8 |
Operation and maintenance | 97.9 | 99.4 |
Depreciation and amortization | 40.3 | 37.7 |
Taxes, other than income taxes | 36.7 | 33.4 |
Total Gas Utility Operating Expenses | 415.7 | 364.3 |
Gas Marketing and other | 41.0 | 41.7 |
Total Operating Expenses | 456.7 | 406.0 |
Operating Income | 105.1 | 89.1 |
Net Economic Earnings (Loss) | 57.9 | 47.5 |
Assets | 6,701.1 | 6,310.1 | $ 6,546.7
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 | 0.3 | 1.1 |
Total Operating Revenues | 2.8 | 1.8 |
Gas Utility |  |  |
Natural and propane gas | 0.0 | 0.0 |
Operation and maintenance | 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 | 4.5 | 2.0 |
Total Operating Expenses | 4.5 | 2.0 |
Operating Income | (1.7) | (0.2) |
Net Economic Earnings (Loss) | (5.2) | (5.7) |
Assets | 2,427.7 | 1,848.7 | 2,239.5
Other | Intersegment revenues |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 2.5 | 0.7 |
Eliminations |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 0.0 | 0.0 |
Total Operating Revenues | (2.6) | (5.1) |
Gas Utility |  |  |
Natural and propane gas | (22.6) | (20.7) |
Operation and maintenance | (1.9) | (1.1) |
Depreciation and amortization | 0.0 | 0.0 |
Taxes, other than income taxes | 0.0 | 0.0 |
Total Gas Utility Operating Expenses | (24.5) | (21.8) |
Gas Marketing and other | 21.9 | 16.7 |
Total Operating Expenses | (2.6) | (5.1) |
Operating Income | 0.0 | 0.0 |
Net Economic Earnings (Loss) | 0.0 | 0.0 |
Assets | (1,571.8) | (1,139.2) | (1,490.2)
Eliminations | Intersegment revenues |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | (2.6) | (5.1) |
Gas Utility | Operating Segments |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 541.9 | 472.3 |
Total Operating Revenues | 542.0 | 476.7 |
Gas Utility |  |  |
Natural and propane gas | 263.4 | 214.5 |
Operation and maintenance | 99.8 | 100.5 |
Depreciation and amortization | 40.3 | 37.7 |
Taxes, other than income taxes | 36.7 | 33.4 |
Total Gas Utility Operating Expenses | 440.2 | 386.1 |
Gas Marketing and other | 0.0 | 0.0 |
Total Operating Expenses | 440.2 | 386.1 |
Operating Income | 101.8 | 90.6 |
Net Economic Earnings (Loss) | 59.5 | 51.8 |
Assets | 5,611.7 | 5,375.6 | 5,551.2
Gas Utility | Operating Segments | Intersegment revenues |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 0.1 | 4.4 |
Gas Marketing | Operating Segments |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | 19.6 | 21.7 |
Total Operating Revenues | 19.6 | 21.7 |
Gas Utility |  |  |
Natural and propane gas | 0.0 | 0.0 |
Operation and maintenance | 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 | 14.6 | 23.0 |
Total Operating Expenses | 14.6 | 23.0 |
Operating Income | 5.0 | (1.3) |
Net Economic Earnings (Loss) | 3.6 | 1.4 |
Assets | 233.5 | 225.0 | $ 246.2
Gas Marketing | Operating Segments | Intersegment revenues |  |  |
Operating Segment Information [Abstract] |  |  |
Total revenues including intersegment revenues | $ 0.0 | $ 0.0 |

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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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