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ACQUISITIONS - Preliminary Fair Value of Alagasco Assets Acquired and Liabilities Assumed (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Aug. 31, 2014 Alagasco | Sep. 30, 2013 Alagasco | Sep. 01, 2013 Alagasco
--- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |
Utility plant |  |  | $ 892.7 |  |
Accounts receivable and other current assets |  |  | 37.3 |  |
Inventories |  |  | 47.7 |  |
Prepayments and other |  |  | 26.6 |  |
Total Current Assets |  |  | 1,004.3 |  |
Regulatory assets |  |  | 99.5 |  |
Deferred tax asset |  |  | 278.4 |  |
Pension and other postretirement |  |  | 25.7 |  |
Other |  |  | 18.2 |  |
Total Deferred Charges |  |  | 421.8 |  |
Total Assets Acquired |  |  | 1,426.1 |  |
Liabilities: |  |  |  |  |
Accounts payable |  |  | 32.9 |  |
Customer deposits |  |  | 19.9 |  |
Taxes accrued |  |  | 28.4 |  |
Regulatory liabilities |  |  |  |  |
Current portion of long-term debt |  |  | 15.0 |  |
Other |  |  | 92.2 |  |
Total Current Liabilities |  |  | 188.4 |  |
Pension and postretirement benefit costs |  |  | 27.9 |  |
Asset retirement obligations |  |  | 30.6 |  |
Regulatory liabilities |  |  | 56.1 |  |
Long-term debt |  |  | 249.8 |  |
Other |  |  | 15.8 |  |
Total Deferred Credits and Other Liabilities |  |  | 380.2 |  |
Total Liabilities Assumed |  |  | 568.6 |  |
Goodwill | 937.8 | 247.1 | 727.6 | 0 | 727.6
Deferred Tax Elimination |  |  | (267.8) |  |
Net Assets Acquired |  |  | $ 1,317.3 |  |

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