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Intangible Assets and Goodwill, Significant Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 5,136.5 | $ 5,343.5 |
Accumulated Amortization | (1,687.5) | (1,735.1) |
Carrying Value | 3,449.0 | $ 3,608.4 | $ 3,690.3
Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Carrying Value | 3,200.0 |  |
Customer relationship intangibles [Member] | EFS Midstream [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,409.8 |  |
Accumulated Amortization | (160.1) |  |
Carrying Value | $ 1,249.7 |  |
Weighted Average Remaining Amortization Period | 22 years 4 months 24 days |  |
Customer relationship intangibles [Member] | State Line and Fairplay [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 895.0 |  |
Accumulated Amortization | (205.1) |  |
Carrying Value | $ 689.9 |  |
Weighted Average Remaining Amortization Period | 27 years 2 months 12 days |  |
Customer relationship intangibles [Member] | San Juan Gathering [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 331.3 |  |
Accumulated Amortization | (236.8) |  |
Carrying Value | $ 94.5 |  |
Weighted Average Remaining Amortization Period | 19 years 9 months 18 days |  |
Customer relationship intangibles [Member] | Oiltanking Partners L.P. [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 1,192.5 |  |
Accumulated Amortization | (122.2) |  |
Carrying Value | $ 1,070.3 |  |
Weighted Average Remaining Amortization Period | 24 years |  |
Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Carrying Value | $ 254.9 |  |
Contract-based intangibles [Member] | Oiltanking Partners L.P. [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 293.3 |  |
Accumulated Amortization | (245.9) |  |
Carrying Value | $ 47.4 |  |
Weighted Average Remaining Amortization Period | 3 years 7 months 6 days |  |
Contract-based intangibles [Member] | Jonah Gas Gathering [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 224.4 |  |
Accumulated Amortization | (171.4) |  |
Carrying Value | $ 53.0 |  |
Weighted Average Remaining Amortization Period | 22 years |  |
Contract-based intangibles [Member] | Delaware Basin Gas Processing LLC [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 82.6 |  |
Accumulated Amortization | (15.0) |  |
Carrying Value | $ 67.6 |  |
Weighted Average Remaining Amortization Period | 7 years |  |

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