Income Taxes (Schedule Of Principal Components Of Net Deferred Tax Liability) (Details) - USD ($)
$ in Millions |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Schedule of Principal Components of Net Deferred Tax Liability [Line Items] |
|
|
| Accelerated depreciation and other property differences |
$ 1.0
|
|
| Pension and other postretirement/postemployment benefits |
0.0
|
|
| Other regulatory assets |
0.0
|
|
| Other, net |
0.0
|
|
| Total Deferred Tax Liabilities |
1.0
|
|
| Deferred investment tax credits and other regulatory liabilities |
0.0
|
|
| Net operating loss carryforward and AMT credit carryforward |
0.0
|
|
| Other accrued liabilities |
0.0
|
|
| Total Deferred Tax Assets |
0.0
|
|
| Deferred Tax Liabilities, Net |
1.0
|
|
| Less: Deferred income taxes related to current assets and liabilities |
0.0
|
|
| Non-Current Deferred Tax Liability |
$ 1.0
|
|
| Predecessor |
|
|
| Schedule of Principal Components of Net Deferred Tax Liability [Line Items] |
|
|
| Accelerated depreciation and other property differences |
|
$ 1,235.3
|
| Pension and other postretirement/postemployment benefits |
|
24.3
|
| Other regulatory assets |
|
62.8
|
| Other, net |
|
77.9
|
| Total Deferred Tax Liabilities |
|
1,400.3
|
| 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)
|
| Deferred Tax Liabilities, Net |
|
1,214.4
|
| Less: Deferred income taxes related to current assets and liabilities |
|
(24.6)
|
| Non-Current Deferred Tax Liability |
|
$ 1,239.0
|