Net Income Per Limited Partner Unit (Schedule of Net Income In Excess Of Distribution) (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Sep. 30, 2015 |
Sep. 30, 2015 |
| Schedule of Undistributed Net Income [Line Items] |
|
|
|
| Net Income (Loss) Allocated to Limited Partners |
$ 22.0
|
$ 51.6
|
[1] |
| Incentive Distribution, Distribution |
0.0
|
0.0
|
[1] |
| Undistributed Earnings, Basic |
4.6
|
8.1
|
[1] |
| Common Units [Member] |
|
|
|
| Schedule of Undistributed Net Income [Line Items] |
|
|
|
| Net Income (Loss) Allocated to Limited Partners |
11.8
|
27.9
|
|
| Distribution Made to Limited Partner, Cash Distributions Declared |
9.3
|
23.2
|
[1] |
| Undistributed Earnings, Basic |
2.5
|
4.7
|
|
| Subordinated Units [Member] |
|
|
|
| Schedule of Undistributed Net Income [Line Items] |
|
|
|
| Net Income (Loss) Allocated to Limited Partners |
10.2
|
23.7
|
|
| Distribution Made to Limited Partner, Cash Distributions Declared |
8.1
|
20.3
|
[1] |
| Undistributed Earnings, Basic |
$ 2.1
|
$ 3.4
|
|
|
|