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Summary Of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2012
Fair Value Offset in Regulatory Assets | The tables below include disclosure of the Regulatory Asset and reclassifications from the Regulatory Asset into Purchased Gas.
Fair Value Amount Offset in Regulatory Assets(1), as of: |
|  |  |  | Fair Value |
(millions) Description |  | Balance Sheet Location |  | September 30, 2012 |  |  | September 30, 2011 |  |  | December 31, 2011 |
Natural Gas Futures Contracts |  | Other Current Liabilities |  | $ | 1.0 |  |  | $ | 1.2 |  |  | $ | 1.7 |
Natural Gas Futures Contracts |  | Other Noncurrent Liabilities |  |  | 0.2 |  |  |  | 0.3 |  |  |  | 0.6 |
Total |  |  |  | $ | 1.2 |  |  | $ | 1.5 |  |  | $ | 2.3 |
(1) | The current portion of Regulatory Assets is recorded as Accrued Revenue on the Company’s unaudited Consolidated Balance Sheets.
Regulatory Assets and Reclassification From the Regulatory Asset into Purchased Gas |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(millions) |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Amount of (Gain) / Loss Recognized in Regulatory Assets for Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural Gas Futures Contracts |  | $ | (0.3 | ) |  | $ | 0.9 |  |  | $ | 1.1 |  |  | $ | 1.5 |
Amount of Loss Reclassified into unaudited Consolidated Statements of Earnings(2): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased Gas |  | $ | — |  |  | $ | — |  |  | $ | 2.2 |  |  | $ | 1.0 |
(2) | 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, 2012, September 30, 2011 and December 31, 2011, which are included in Accounts Receivable, net on the accompanying unaudited consolidated balance sheets, were as follows:
|  | September 30, |  |  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2011 |
Allowance for Doubtful Accounts |  | $ | 2.7 |  |  | $ | 2.5 |  |  | $ | 2.3 |

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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 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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 + Details
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