Net Income Per Limited Partner Unit (Schedule of Net Income Per Limited Partner Unit) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions |
2 Months Ended |
3 Months Ended |
Mar. 31, 2015 |
Mar. 31, 2016 |
| Schedule Of Earnings Per Unit [Line Items] |
|
|
|
| Partners' Capital Account, Distributions |
$ 0.0
|
|
$ 18.9
|
| Undistributed Earnings, Basic |
13.3
|
[1] |
8.4
|
| Net Income (Loss) Allocated to Limited Partners |
$ 13.3
|
|
$ 27.3
|
| Weighted Average Number of Shares Outstanding, Basic and Diluted |
100.6
|
|
100.6
|
| Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax |
$ 0.13
|
|
$ 0.25
|
| Incentive Distribution Rights [Member] |
|
|
|
| Schedule Of Earnings Per Unit [Line Items] |
|
|
|
| Incentive Distribution, Distribution |
$ 0.0
|
|
$ 0.0
|
| Undistributed Earnings, Basic |
0.0
|
[1] |
2.3
|
| Net Income (Loss) Allocated to Limited Partners |
0.0
|
|
2.3
|
| Subordinated Units |
|
|
|
| Schedule Of Earnings Per Unit [Line Items] |
|
|
|
| Distribution Made to Limited Partner, Cash Distributions Declared |
0.0
|
|
8.8
|
| Undistributed Earnings, Basic |
6.2
|
[1] |
2.8
|
| Net Income (Loss) Allocated to Limited Partners |
$ 6.2
|
|
$ 11.6
|
| Weighted Average Number of Shares Outstanding, Basic and Diluted |
46.8
|
|
46.8
|
| Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax |
$ 0.13
|
|
$ 0.25
|
| Common Units |
|
|
|
| Schedule Of Earnings Per Unit [Line Items] |
|
|
|
| Distribution Made to Limited Partner, Cash Distributions Declared |
$ 0.0
|
|
$ 10.1
|
| Undistributed Earnings, Basic |
7.1
|
[1] |
3.3
|
| Net Income (Loss) Allocated to Limited Partners |
$ 7.1
|
|
$ 13.4
|
| Weighted Average Number of Shares Outstanding, Basic and Diluted |
53.8
|
|
53.8
|
| Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax |
$ 0.13
|
|
$ 0.25
|
|
|