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INFORMATION BY OPERATING SEGMENT - Schedule of Operating Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | $ 1,627.2 |  | $ 1,017.0 |  | $ 1,125.5 |
Total Operating Revenues | 222.3 | 241.8 | 694.5 | 468.6 | 147.1 | 165.3 | 397.6 | 307.0 | 1,627.2 |  | 1,017.0 |  | 1,125.5 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  | 731.7 |  | 433.4 |  | 397.3 |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  | 287.8 |  | 180.3 |  | 167.4 |
Depreciation & amortization |  |  |  |  |  |  |  |  | 82.4 |  | 48.3 |  | 40.7 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 112.0 |  | 60.1 |  | 53.7 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  | 1,213.9 |  | 722.1 |  | 659.1 |
Gas Marketing and other |  |  |  |  |  |  |  |  | 226.4 |  | 176.6 |  | 353.3 |
Other |  |  |  |  |  |  |  |  | 20.5 |  | 21.8 |  | 2.5 |
Total Operating Expenses |  |  |  |  |  |  |  |  | 1,460.8 |  | 920.5 |  | 1,014.9 |
Operating Income | (8.4) | 24.7 | 87.2 | 62.9 | (9.7) | 12.3 | 51.8 | 42.1 | 166.4 |  | 96.5 |  | 110.6 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  | 100.1 |  | 65.0 |  | 62.6 |
Capital Expenditures |  |  |  |  |  |  |  |  | 171.0 |  | 130.8 |  | 108.8 |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 5,074.0 |  |  |  | 3,125.4 |  |  |  | 5,074.0 |  | 3,125.4 |  | 1,880.3 |
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | 1,462.6 |  | 847.2 |  | 763.5 |
Total Operating Revenues |  |  |  |  |  |  |  |  | 1,467.8 |  | 857.8 |  | 764.7 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  | 821.8 |  | 469.1 |  | 414.8 |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  | 288.7 |  | 180.7 |  | 167.4 |
Depreciation & amortization |  |  |  |  |  |  |  |  | 82.4 |  | 48.3 |  | 40.7 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 112.0 |  | 60.1 |  | 53.7 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  | 1,304.9 |  | 758.2 |  | 676.6 |
Gas Marketing and other |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Other |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Total Operating Expenses |  |  |  |  |  |  |  |  | 1,304.9 |  | 758.2 |  | 676.6 |
Operating Income |  |  |  |  |  |  |  |  | 162.9 |  | 99.6 |  | 88.1 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  | 92.8 |  | 56.6 |  | 48.1 |
Capital Expenditures |  |  |  |  |  |  |  |  | 168.6 |  | 128.5 |  | 106.7 |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 4,520.0 |  |  |  | 2,981.0 |  |  |  | 4,520.0 |  | 2,981.0 |  | 1,759.0 |
Gas Utility | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | 5.2 |  | 10.6 |  | 1.2 |
Gas Marketing |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | 162.6 |  | 165.1 |  | 358.1 |
Total Operating Revenues |  |  |  |  |  |  |  |  | 246.6 |  | 189.4 |  | 373.5 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation & amortization |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Gas Marketing and other |  |  |  |  |  |  |  |  | 226.4 | [1] | 176.6 | [1] | 353.3 | [1]
Other |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Total Operating Expenses |  |  |  |  |  |  |  |  | 226.4 |  | 176.6 |  | 353.3 |
Operating Income |  |  |  |  |  |  |  |  | 20.2 |  | 12.8 |  | 20.2 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  | 10.2 |  | 8.9 |  | 12.3 |
Capital Expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0.1 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 0.4 |  | 0.3 |  | 0.3 |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 156.7 |  |  |  | 163.9 |  |  |  | 156.7 |  | 163.9 |  | 190.7 |
Gas Marketing | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | 84.0 |  | 24.3 |  | 15.4 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | 2.0 |  | 4.7 |  | 3.9 |
Total Operating Revenues |  |  |  |  |  |  |  |  | 3.8 |  | 6.2 |  | 4.9 |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation & amortization |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Gas Marketing and other |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Other |  |  |  |  |  |  |  |  | 20.5 | [2] | 22.1 | [2] | 2.6 | [2]
Total Operating Expenses |  |  |  |  |  |  |  |  | 20.5 |  | 22.1 |  | 2.6 |
Operating Income |  |  |  |  |  |  |  |  | (16.7) |  | (15.9) |  | 2.3 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  | (2.9) |  | (0.5) |  | 2.2 |
Capital Expenditures |  |  |  |  |  |  |  |  | 2.4 |  | 2.3 |  | 2.0 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 0.5 |  | 0.6 |  | 0.3 |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 1,575.7 |  |  |  | 115.6 |  |  |  | 1,575.7 |  | 115.6 |  | 102.2 |
Other | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | 1.8 |  | 1.5 |  | 1.0 |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total Operating Revenues |  |  |  |  |  |  |  |  | (91.0) |  | (36.4) |  | (17.6) |
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural and propane gas |  |  |  |  |  |  |  |  | (90.1) |  | (35.7) |  | (17.5) |
Other operation and maintenance expenses |  |  |  |  |  |  |  |  | (0.9) |  | (0.4) |  | 0 |
Depreciation & amortization |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total Gas Utility Operating Expenses |  |  |  |  |  |  |  |  | (91.0) |  | (36.1) |  | (17.5) |
Gas Marketing and other |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Other |  |  |  |  |  |  |  |  | 0 |  | (0.3) |  | (0.1) |
Total Operating Expenses |  |  |  |  |  |  |  |  | (91.0) |  | (36.4) |  | (17.6) |
Operating Income |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net Economic Earnings (Non-GAAP) |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Capital Expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | (1,178.4) |  |  |  | (135.1) |  |  |  | (1,178.4) |  | (135.1) |  | (171.6) |
Eliminations | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues including intersegment revenues |  |  |  |  |  |  |  |  | $ (91.0) |  | $ (36.4) |  | $ (17.6) |
[1] | Depreciation and amortization for Gas Marketing are included in Gas Marketing Expenses on the Statements of Consolidated Income ($0.4 for fiscal year 2014, $0.3 for fiscal year 2013, and $0.3 for fiscal year 2012).
[2] | Depreciation, amortization, and accretion for Other is included in the Other Operating Expenses on the Statements of Consolidated Income ($0.5 for fiscal year 2014, $0.6 for fiscal year 2013 and $0.3 for fiscal year 2012).

X
- 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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