Income Taxes (Tables)
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12 Months Ended |
Dec. 31, 2015 |
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| Income Tax Disclosure [Abstract] |
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| Schedule Of Components Of Income Tax Expense |
| | | | | | | | | | | | | Year Ended December 31, (in millions) | 2015 | | 2014 | | 2013 | | | | Predecessor | | Predecessor | Income Taxes | | | | | | Current | | | | | | Federal | $ | 12.0 |
| | $ | 21.3 |
| | $ | (16.1 | ) | State | 1.2 |
| | 5.8 |
| | (11.4 | ) | Total Current | 13.2 |
| | 27.1 |
| | (27.5 | ) | Deferred | | | | | | Federal | 8.8 |
| | 117.7 |
| | 155.9 |
| State | 1.9 |
| | 21.7 |
| | 24.1 |
| Total Deferred | 10.7 |
| | 139.4 |
| | 180.0 |
| Deferred Investment Credits | — |
| | (0.1 | ) | | (0.1 | ) | Total Income Taxes | $ | 23.9 |
| | $ | 166.4 |
| | $ | 152.4 |
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| Schedule Of Reasons Behind Differences In Computation Of Total Income Taxes |
| | | | | | | | | | | | | | | | | | | | | | Year Ended December 31, (in millions) | 2015 | | 2014 | | 2013 | | | | | | Predecessor | | Predecessor | Book income before income taxes | $ | 554.1 |
| | | | $ | 435.5 |
| | | | $ | 419.3 |
| | | Tax expense at statutory federal income tax rate | 193.9 |
| | 35.0 | % | | 152.4 |
| | 35.0 | % | | 146.8 |
| | 35.0 | % | Increases (reductions) in taxes resulting from: | | | | | | | | | | | | State income taxes, net of federal income tax benefit | 2.0 |
| | 0.4 |
| | 17.9 |
| | 4.1 |
| | 8.2 |
| | 1.9 |
| Income not subject to income tax at the partnership level | (170.6 | ) | | (30.9 | ) | | — |
| | — |
| | — |
| | — |
| AFUDC-Equity | (0.3 | ) | | — |
| | (3.8 | ) | | (0.9 | ) | | (2.4 | ) | | (0.6 | ) | Other, net | (1.1 | ) | | (0.2 | ) | | (0.1 | ) | | — |
| | (0.2 | ) | | — |
| Total Income Taxes | $ | 23.9 |
| | 4.3 | % | | $ | 166.4 |
| | 38.2 | % | | $ | 152.4 |
| | 36.3 | % |
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| Schedule Of Principal Components Of Net Deferred Tax Liability |
| | | | | | | | | At December 31, (in millions) | 2015 | | 2014 | | | | Predecessor | Deferred tax liabilities | | | | Accelerated depreciation and other property differences | $ | 1.0 |
| | $ | 1,235.3 |
| Pension and other postretirement/postemployment benefits | — |
| | 24.3 |
| Other regulatory assets | — |
| | 62.8 |
| Other, net | — |
| | 77.9 |
| Total Deferred Tax Liabilities | 1.0 |
| | 1,400.3 |
| Deferred tax assets | | | | Deferred investment tax credits and other regulatory liabilities | — |
| | (116.7 | ) | Net operating loss carryforward and AMT credit carryforward | — |
| | (67.8 | ) | Other accrued liabilities | — |
| | (1.4 | ) | Total Deferred Tax Assets | — |
| | (185.9 | ) | Net Deferred Tax Liabilities less Deferred Tax Assets | 1.0 |
| | 1,214.4 |
| Less: Deferred income taxes related to current assets and liabilities | — |
| | (24.6 | ) | Non-Current Deferred Tax Liabilities | $ | 1.0 |
| | $ | 1,239.0 |
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