Nature Of Operations And Summary Of Significant Accounting Policies (Tables)
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12 Months Ended |
Dec. 31, 2015 |
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] |
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| Schedule of AFUDC Debt and Equity Rates |
| | | | | | | | | | | | | | | | | | | | 2015 | | 2014 | | 2013 | | Debt | | Equity | | Debt | | Equity | | Debt | | Equity | | | | | | Predecessor | | Predecessor | Columbia Gas Transmission | 1.8 | % | | 6.3 | % | | 0.9 | % | | 3.0 | % | | 2.5 | % | | 3.2 | % | Columbia Gulf | 2.9 | % | | 6.3 | % | | 2.1 | % | | 9.4 | % | | 2.5 | % | | 3.2 | % |
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| Capitalized Exploratory Well Costs, Roll Forward |
| | | | | | | | | (in millions) | 2015 | | 2014 | Beginning Balance | $ | 14.9 |
| | $ | 1.9 |
| Additions pending the determination of proved reserves | 1.3 |
| | 20.1 |
| Reclassifications of proved properties | (14.5 | ) | | (7.1 | ) | Ending Balance | $ | 1.7 |
| | $ | 14.9 |
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