Net Income Per Limited Partner Unit (Schedule of Net Income In Excess Of Distribution) (Details) - Jun. 30, 2015 - USD ($) $ in Millions |
Total |
Total |
|---|---|---|
| Schedule of Undistributed Net Income [Line Items] | ||
| Net Income (Loss) Allocated to Limited Partners | $ 16.3 | $ 29.6 |
| Incentive Distribution, Distribution | 0.0 | 0.0 |
| Undistributed Earnings, Basic | (0.6) | 3.5 |
| Common Units [Member] | ||
| Schedule of Undistributed Net Income [Line Items] | ||
| Net Income (Loss) Allocated to Limited Partners | 9.0 | 16.1 |
| Distribution Made to Limited Partner, Cash Distributions Declared | 9.0 | 13.9 |
| Undistributed Earnings, Basic | 0.0 | 2.2 |
| Subordinated Units [Member] | ||
| Schedule of Undistributed Net Income [Line Items] | ||
| Net Income (Loss) Allocated to Limited Partners | 7.3 | 13.5 |
| Distribution Made to Limited Partner, Cash Distributions Declared | 7.9 | 12.2 |
| Undistributed Earnings, Basic | $ (0.6) | $ 1.3 |