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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2013
Regulatory Assets |
|  | September 30, |  |  | December 31, |
Regulatory Assets consist of the following (millions) |  | 2013 |  |  | 2012 |  |  | 2012 |
Energy Supply & Other Regulatory Tracker Mechanisms |  | $ | 20.9 |  |  | $ | 34.0 |  |  | $ | 41.0 |
Deferred Restructuring Costs |  |  | 11.6 |  |  |  | 20.3 |  |  |  | 20.1 |
Retirement Benefit Obligations |  |  | 62.7 |  |  |  | 55.2 |  |  |  | 62.5 |
Income Taxes |  |  | 9.3 |  |  |  | 10.6 |  |  |  | 10.2 |
Environmental Obligations |  |  | 16.1 |  |  |  | 16.7 |  |  |  | 16.8 |
Deferred Storm Charges |  |  | 26.5 |  |  |  | 25.4 |  |  |  | 27.8 |
Other |  |  | 6.8 |  |  |  | 8.4 |  |  |  | 8.1 |
Total Regulatory Assets |  | $ | 153.9 |  |  | $ | 170.6 |  |  | $ | 186.5 |
Less: Current Portion of Regulatory Assets(1) |  |  | 33.0 |  |  |  | 38.1 |  |  |  | 51.9 |
Regulatory Assets – noncurrent |  | $ | 120.9 |  |  | $ | 132.5 |  |  | $ | 134.6 |
(1) | Reflects amounts included in Accrued Revenue, discussed below, on the Company’s unaudited Consolidated Balance Sheets.
Regulatory Liabilities |
|  | September 30, |  |  | December 31, |
Regulatory Liabilities consist of the following (millions) |  | 2013 |  |  | 2012 |  |  | 2012 |
Regulatory Tracker Mechanisms |  | $ | 11.4 |  |  | $ | 7.3 |  |  | $ | 6.8 |
Total Regulatory Liabilities |  | $ | 11.4 |  |  | $ | 7.3 |  |  | $ | 6.8 |
Components of Accrued Revenue | The following table shows the components of Accrued Revenue as of September 30, 2013, September 30, 2012 and December 31, 2012.
|  | September 30, |  |  | December 31, |
Accrued Revenue ($millions) |  | 2013 |  |  | 2012 |  |  | 2012 |
Regulatory Assets – Current |  | $ | 33.0 |  |  | $ | 38.1 |  |  | $ | 51.9 |
Unbilled Revenues |  |  | 7.2 |  |  |  | 6.4 |  |  |  | 11.5 |
Total Accrued Revenue |  | $ | 40.2 |  |  | $ | 44.5 |  |  | $ | 63.4 |
Components of Gas Inventory | The following table shows the components of Gas Inventory as of September 30, 2013, September 30, 2012 and December 31, 2012.
|  | September 30, |  |  | December 31, |
Gas Inventory ($millions) |  | 2013 |  |  | 2012 |  |  | 2012 |
Natural Gas |  | $ | 0.8 |  |  | $ | 0.5 |  |  | $ | 0.6 |
Propane |  |  | 0.3 |  |  |  | 0.4 |  |  |  | 0.4 |
Liquefied Natural Gas & Other |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |
Total Gas Inventory |  | $ | 1.2 |  |  | $ | 1.0 |  |  | $ | 1.1 |
Components of Exchange Gas Receivable | The following table shows the components of Exchange Gas Receivable as of September 30, 2013, September 30, 2012 and December 31, 2012.
|  | September 30, |  |  | December 31, |
Exchange Gas Receivable ($millions) |  | 2013 |  |  | 2012 |  |  | 2012 |
Northern Utilities |  | $ | 11.8 |  |  | $ | 10.6 |  |  | $ | 8.7 |
Fitchburg |  |  | 1.0 |  |  |  | 0.7 |  |  |  | 0.7 |
Total Exchange Gas Receivable |  | $ | 12.8 |  |  | $ | 11.3 |  |  | $ | 9.4 |
Components of Energy Supply Obligations |
|  | September 30, |  |  | December 31, |
Energy Supply Obligations ($millions) |  | 2013 |  |  | 2012 |  |  | 2012 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Exchange Gas Obligation |  | $ | 11.8 |  |  | $ | 10.6 |  |  | $ | 8.7 |
Renewable Energy Portfolio Standards |  |  | 2.7 |  |  |  | 4.4 |  |  |  | 4.2 |
Power Supply Contract Divestitures |  |  | 0.9 |  |  |  | 2.8 |  |  |  | 0.9 |
Total Energy Supply Obligations – Current |  | $ | 15.4 |  |  | $ | 17.8 |  |  | $ | 13.8 |
Long-Term: |  |  |  |  |  |  |  |  |  |  |  |
Power Supply Contract Divestitures |  | $ | 2.7 |  |  | $ | 3.6 |  |  | $ | 3.3 |
Total Energy Supply Obligations |  | $ | 18.1 |  |  | $ | 21.4 |  |  | $ | 17.1 |
Fair Value Amount of Derivative Assets Liabilities Offset in Regulatory Liabilities Assets |
Fair Value Amount of Derivative Assets / Liabilities (millions) Offset in Regulatory Liabilities / Assets, as of: |
|  |  |  | Fair Value |
Description |  | Balance Sheet Location |  | September 30, 2013 |  |  | September 30, 2012 |  |  | December 31, 2012 |
Derivative Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural Gas Futures Contracts |  | Prepayments and Other |  | $ | — |  |  | $ | — |  |  | $ | — |
Natural Gas Futures Contracts |  | Other Noncurrent Assets |  |  | 0.1 |  |  |  | 0.2 |  |  |  | — |
Total Derivative Assets |  |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | — |
Derivative Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural Gas Futures Contracts |  | Other Current Liabilities |  | $ | 0.4 |  |  | $ | 1.0 |  |  | $ | 0.7 |
Natural Gas Futures Contracts |  | Other Noncurrent Liabilities |  |  | — |  |  |  | — |  |  |  | — |
Total Derivative Liabilities |  |  |  | $ | 0.4 |  |  | $ | 1.0 |  |  | $ | 0.7 |
Regulatory Assets Liabilities and Reclassification from Regulatory Assets Liabilities into Purchased Gas |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Amount of (Gain) / Loss Recognized in Regulatory Assets for Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural Gas Futures Contracts |  | $ | 0.1 |  |  | $ | (0.7 | ) |  | $ | 0.7 |  |  | $ | 0.7 |
Amount of Loss Reclassified into unaudited Consolidated Statements of Earnings(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased Gas |  | $ | 0.2 |  |  | $ | — |  |  | $ | 1.1 |  |  | $ | 2.2 |
(1) | These amounts are offset in the unaudited Consolidated Statements of Earnings with Accrued Revenue and therefore there is no effect on earnings.
Allowance for Doubtful Accounts Included in Accounts Receivable Net | The Allowance for Doubtful Accounts as of September 30, 2013, September 30, 2012 and December 31, 2012, which are included in Accounts Receivable, net on the accompanying unaudited Consolidated Balance Sheets, are as follows:
|  | September 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |  |  | 2012 |
Allowance for Doubtful Accounts |  | $ | 2.5 |  |  | $ | 2.7 |  |  | $ | 1.9 |

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + Details
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