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Partners' Capital Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 07, 2018 | Mar. 31, 2018 | Feb. 14, 2018 | Dec. 31, 2017
Schedule of Partners' Capital [Line Items] |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 31.2376 |  |  |
Percentage of membership interest acquired |  | 100.00% |  |
Common Units |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |
Limited Partners' Capital Account, Units Outstanding |  | 54,028,041 |  |
Common Units [Member] |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |
Limited Partners' Capital Account, Units Outstanding |  | 82,492,008 |  | 99,667,999
Partners' Capital Account, Units, Sale of Units |  | 17,286,859 |  |
Parent Company [Member] |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |
Percentage of membership interest acquired |  | 34.50% |  |
Parent Company [Member] | Common Units [Member] |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |
Limited Partners' Capital Account, Units Outstanding |  | 28,463,967 |  |
Series A Preferred Unit [Member] |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |
Preferred Unit, Quarterly Distribution |  |  | $ 10 |

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