Pension And Other Postretirement Benefits (Schedule Of Changes In Plan Assets And Projected Benefit Obligations Recognized In Other Comprehensive Income) (Details) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Pension Plan |
|
|
|
|
| Net actuarial (gain)/loss |
[1] |
$ (7.3)
|
|
|
| Amortization of prior service cost |
|
0.9
|
|
|
| Less: amortization of net actuarial (gain) loss |
|
8.2
|
|
|
| Other Postretirement Benefits |
|
|
|
|
| Net actuarial (gain)/loss |
[1] |
(11.6)
|
|
|
| Amortization of prior service cost |
|
(0.1)
|
|
|
| Less: amortization of net actuarial (gain) loss |
|
(0.2)
|
|
|
| Predecessor | Pension Plan |
|
|
|
|
| Net actuarial (gain)/loss |
[1] |
|
$ 20.0
|
|
| Amortization of prior service cost |
|
|
1.0
|
$ 0.9
|
| Less: amortization of net actuarial (gain) loss |
|
|
6.6
|
10.6
|
| Predecessor | Other Postretirement Benefits |
|
|
|
|
| Net actuarial (gain)/loss |
[1] |
|
4.6
|
|
| Amortization of prior service cost |
|
|
(0.1)
|
(0.1)
|
| Less: amortization of net actuarial (gain) loss |
|
|
(0.1)
|
$ 1.0
|
| Regulatory Assets and Liabilities [Member] | Pension Plan |
|
|
|
|
| Net actuarial (gain)/loss |
|
14.1
|
|
|
| Amortization of prior service cost |
|
(0.9)
|
|
|
| Less: amortization of net actuarial (gain) loss |
|
(8.2)
|
|
|
| Total Recognized in Other Comprehensive Income or Regulatory Asset or Liability |
|
6.8
|
|
|
| Amount Recognized in Net Periodic Benefits Cost and Other Comprehensive Income or Regulatory Asset or Liability |
|
8.3
|
|
|
| Regulatory Assets and Liabilities [Member] | Other Postretirement Benefits |
|
|
|
|
| Net actuarial (gain)/loss |
|
7.8
|
|
|
| Amortization of prior service cost |
|
0.1
|
|
|
| Less: amortization of net actuarial (gain) loss |
|
0.2
|
|
|
| Total Recognized in Other Comprehensive Income or Regulatory Asset or Liability |
|
7.9
|
|
|
| Amount Recognized in Net Periodic Benefits Cost and Other Comprehensive Income or Regulatory Asset or Liability |
|
$ (4.6)
|
|
|
| Regulatory Assets and Liabilities [Member] | Predecessor | Pension Plan |
|
|
|
|
| Net actuarial (gain)/loss |
|
|
24.4
|
|
| Amortization of prior service cost |
|
|
(1.0)
|
|
| Less: amortization of net actuarial (gain) loss |
|
|
(6.6)
|
|
| Total Recognized in Other Comprehensive Income or Regulatory Asset or Liability |
|
|
18.8
|
|
| Amount Recognized in Net Periodic Benefits Cost and Other Comprehensive Income or Regulatory Asset or Liability |
|
|
19.1
|
|
| Regulatory Assets and Liabilities [Member] | Predecessor | Other Postretirement Benefits |
|
|
|
|
| Net actuarial (gain)/loss |
|
|
11.7
|
|
| Amortization of prior service cost |
|
|
0.0
|
|
| Less: amortization of net actuarial (gain) loss |
|
|
0.0
|
|
| Total Recognized in Other Comprehensive Income or Regulatory Asset or Liability |
|
|
11.7
|
|
| Amount Recognized in Net Periodic Benefits Cost and Other Comprehensive Income or Regulatory Asset or Liability |
|
|
$ 0.9
|
|
|
|