Pension And Other Postretirement Benefits Pension And Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Jul. 01, 2016 |
| Pension Plan |
|
|
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
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|
| Defined Benefit Plan, Contributions by Employer |
|
|
$ 0.0
|
|
|
| Change in Projected Benefit Obligation, Net of Plan Assets, Due to Interim Measurement |
$ 0.4
|
|
0.4
|
|
|
| Decrease in regulatory assets due to interim measurement |
|
|
|
|
$ 0.9
|
| Change in Accumulated Other Comprehensive Income Due to Interim Measurement |
0.1
|
|
0.1
|
|
|
| Change in Net Periodic Benefit Cost due to Interim Measurement |
|
|
0.7
|
|
|
| Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |
(2.6)
|
$ 0.0
|
(2.6)
|
$ 0.0
|
|
| Other Postretirement Benefits |
|
|
|
|
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| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
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| Defined Benefit Plan, Contributions by Employer |
|
|
1.0
|
|
|
| Change in Projected Benefit Obligation, Net of Plan Assets, Due to Interim Measurement |
10.1
|
|
10.1
|
|
|
| Change in Accumulated Other Comprehensive Income Due to Interim Measurement |
0.0
|
|
0.0
|
|
|
| Change in Net Periodic Benefit Cost due to Interim Measurement |
|
|
1.0
|
|
|
| Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |
$ 0.0
|
$ 0.0
|
$ 0.0
|
$ 0.0
|
|
| Increase in regulatory assets due to interim measurement |
|
|
|
|
8.6
|
| Decrease in regulatory liabilities due to interim measurement |
|
|
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|
$ 1.7
|