Other, Net (Schedule of Other, Net) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
| Schedule Of Other, Net [Line Items] | ||||
| AFUDC Equity | $ 6.6 | $ 15.0 | ||
| Miscellaneous | 2.8 | 3.6 | ||
| Total Other, net | $ 9.4 | $ 18.6 | ||
| Predecessor | ||||
| Schedule Of Other, Net [Line Items] | ||||
| AFUDC Equity | $ 3.9 | $ 8.2 | ||
| Miscellaneous | (0.3) | (0.2) | ||
| Total Other, net | $ 3.6 | $ 8.0 | ||