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Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 03, 2017 | Aug. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investments in Unconsolidated Entities |  |  |  |  |  |
Investments in unconsolidated entities |  |  |  | $ 2,756.0 | $ 2,343.0 | $ 2,027.0
Value of units contributed |  |  |  | 40.0 |  |
Return of investment from unconsolidated entities |  |  |  | 21.0 |  |
Capital contributions to equity method investees excluding capitalized interest |  |  |  | 398.0 | 288.0 | 245.0
Return of cash contributions |  |  |  | 6.0 |  | 53.0
Capitalized interest related to contributions to unconsolidated entities |  |  |  | 35.0 | 47.0 | 57.0
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets |  |  |  | $ 736.0 | 758.0 |
Advantage Pipeline Holdings LLC (“Advantage Joint Venture”) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest | 50.00% |  |  | 50.00% |  |
Investments in unconsolidated entities | $ 66.5 |  |  | $ 69.0 | 0.0 |
Payments to acquire investments | 26.0 |  |  |  |  |
BridgeTex Pipeline Company, LLC (“BridgeTex”) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 1,093.0 | 1,098.0 |
Butte Pipe Line Company |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Investments in unconsolidated entities |  |  |  | $ 0.0 | 11.0 |
Caddo Pipeline LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 67.0 | 65.0 |
Cheyenne Pipeline LLC (“Cheyenne”) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 29.0 | 30.0 |
Ownership percentage sold |  |  | 50.00% |  |  |
Diamond Pipeline LLC (“Diamond”) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 467.0 | 143.0 |
Eagle Ford Pipeline LLC (“Eagle Ford Pipeline”) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 378.0 | 372.0 |
Eagle Ford Terminals Corpus Christi LLC (“Eagle Ford Terminals”) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 75.0 | 53.0 |
Frontier Aspen LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Investments in unconsolidated entities |  |  |  | $ 0.0 | 45.0 |
Midway Pipeline LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 20.0 | 0.0 |
Saddlehorn Pipeline Company, LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 40.00% |  |
Investments in unconsolidated entities |  |  |  | $ 217.0 | 213.0 |
Settoon, Towing LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 69.0 | 87.0 |
Return of investment from unconsolidated entities |  |  |  | $ 21.0 |  |
STACK Pipeline LLC (“STACK”) |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 50.00% |  |
Investments in unconsolidated entities |  |  |  | $ 73.0 | 14.0 |
Ownership percentage sold |  | 50.00% |  |  |  |
White Cliffs Pipeline, LLC |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Ownership interest |  |  |  | 36.00% |  |
Investments in unconsolidated entities |  |  |  | $ 199.0 | 212.0 |
Equity Method Investees |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |
Capitalized interest related to contributions to unconsolidated entities |  |  |  | $ 18.0 | $ 13.0 | $ 8.0
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 |  |  |  |  |

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