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Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 22 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2017 | Jan. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 14, 2016 | Aug. 31, 2016 | Jun. 30, 2016
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 2,702.0 | $ 2,756.0 | $ 2,343.0 |  |  |
Gain on sale of investment in unconsolidated entities |  |  |  |  | 200.0 | 0.0 | 0.0 |  |  |
Value of units contributed |  |  |  |  |  | 40.0 |  |  |  |
Limited partner interest |  |  |  |  |  |  |  | 98.00% |  |
Return of investment from unconsolidated entities |  |  |  |  | 10.0 | 21.0 |  |  |  |
Capital contributions to equity method investees excluding capitalized interest |  |  |  |  | 459.0 | 398.0 | 288.0 |  |  |
Capitalized interest related to contributions to unconsolidated entities |  |  |  |  | 30.0 | 35.0 | 47.0 |  |  |
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets |  |  |  |  | $ 467.0 | 736.0 |  |  |  |
Advantage Pipeline Holdings LLC (“Advantage Joint Venture”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest | 50.00% |  |  |  | 50.00% |  |  |  |  |
Investments in unconsolidated entities | $ 66.5 |  |  |  | $ 72.0 | 69.0 |  |  |  |
Payments to acquire investments | 26.0 |  |  |  |  |  |  |  |  |
BridgeTex Pipeline Company, LLC (“BridgeTex”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  | 20.00% |  | 20.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 435.0 | 1,093.0 |  |  |  |
Proceeds from sale of equity investments |  |  | $ 868.0 |  |  |  |  |  |  |
Ownership percentage sold |  |  | 30.00% |  | 30.00% |  |  |  |  |
Gain on sale of investment in unconsolidated entities |  |  |  |  | $ 200.0 |  |  |  |  |
Cactus II Pipeline LLC (“Cactus II”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 65.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 455.0 | 0.0 |  |  |  |
Property and equipment disposals |  |  |  | $ 74.0 |  |  |  |  |  |
Proceeds from sale of equity investments |  |  |  | $ 26.0 |  |  |  |  |  |
Caddo Pipeline LLC |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 50.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 65.0 | 67.0 |  |  |  |
Cheyenne Pipeline LLC (“Cheyenne”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 50.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 44.0 | 29.0 |  |  |  |
Ownership percentage sold |  |  |  |  |  |  |  |  |  | 50.00%
Diamond Pipeline LLC (“Diamond”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 50.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 479.0 | 467.0 |  |  |  |
Eagle Ford Pipeline LLC (“Eagle Ford Pipeline”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 50.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 383.0 | 378.0 |  |  |  |
Eagle Ford Terminals Corpus Christi LLC (“Eagle Ford Terminals”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 50.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 108.0 | 75.0 |  |  |  |
Midway Pipeline LLC |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 50.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 78.0 | 20.0 |  |  |  |
Saddlehorn Pipeline Company, LLC |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 40.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 215.0 | 217.0 |  |  |  |
Settoon Towing, LLC |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 50.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 58.0 | 69.0 |  |  |  |
Return of investment from unconsolidated entities |  |  |  |  |  | 21.0 |  |  |  |
STACK Pipeline LLC (“STACK”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 50.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 120.0 | 73.0 |  |  |  |
Ownership percentage sold |  |  |  |  |  |  |  |  | 50.00% |
White Cliffs Pipeline, LLC |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 36.00% |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  | $ 190.0 | 199.0 |  |  |  |
Oxy | Cactus II Pipeline LLC (“Cactus II”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Interest acquired |  |  |  | 20.00% |  |  |  |  |  |
Equity Method Investees |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Capitalized interest related to contributions to unconsolidated entities |  |  |  |  | $ 9.0 | $ 18.0 | $ 13.0 |  |  |
Third Party | Cactus II Pipeline LLC (“Cactus II”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Interest acquired |  |  |  | 15.00% |  |  |  |  |  |
Advantage Joint Venture | Advantage Pipeline Holdings LLC (“Advantage Joint Venture”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Purchase price | $ 133.0 |  |  |  |  |  |  |  |  |
Common Units | Advantage Pipeline Holdings LLC (“Advantage Joint Venture”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Units contributed | 1.3 |  |  |  |  |  |  |  |  |
Value of units contributed | $ 40.0 |  |  |  |  |  |  |  |  |
Other long-term liabilities and deferred credits | Cactus II Pipeline LLC (“Cactus II”) |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Advanced cash payment |  |  |  | $ 100.0 |  |  |  |  |  |
Capline pipeline system |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Undivided Joint Interest Ownership Percentage |  |  |  |  | 54.00% |  |  |  |  |
Subsequent Event | Wink to Webster Pipeline LLC |  |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |  |
Limited partner interest |  | 20.00% |  |  |  |  |  |  |  |

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