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Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 5,344.3 |  | $ 5,255.1
Accumulated Amortization | (1,607.9) |  | (1,564.8)
Carrying Value | 3,736.4 |  | 3,690.3
Amortization expense | 43.1 | $ 41.0 |
Forecasted amortization expense [Abstract] |  |  |
Remainder of 2018 | 122.5 |  |
2019 | 151.4 |  |
2020 | 140.5 |  |
2021 | 148.1 |  |
2022 | 144.3 |  |
NGL Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 817.4 |  | 728.2
Accumulated Amortization | (413.0) |  | (405.9)
Carrying Value | 404.4 |  | 322.3
Amortization expense | 7.1 | 7.3 |
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 457.8 |  | 447.4
Accumulated Amortization | (191.1) |  | (187.5)
Carrying Value | 266.7 |  | 259.9
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 359.6 |  | 280.8
Accumulated Amortization | (221.9) |  | (218.4)
Carrying Value | 137.7 |  | 62.4
Crude Oil Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,484.5 |  | 2,484.5
Accumulated Amortization | (322.0) |  | (298.0)
Carrying Value | 2,162.5 |  | 2,186.5
Amortization expense | 24.0 | 23.1 |
Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,203.5 |  | 2,203.5
Accumulated Amortization | (139.5) |  | (127.0)
Carrying Value | 2,064.0 |  | 2,076.5
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 281.0 |  | 281.0
Accumulated Amortization | (182.5) |  | (171.0)
Carrying Value | 98.5 |  | 110.0
Natural Gas Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,815.0 |  | 1,815.0
Accumulated Amortization | (806.3) |  | (796.6)
Carrying Value | 1,008.7 |  | 1,018.4
Amortization expense | 9.7 | 8.2 |
Natural Gas Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,350.3 |  | 1,350.3
Accumulated Amortization | (424.7) |  | (417.1)
Carrying Value | 925.6 |  | 933.2
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 464.7 |  | 464.7
Accumulated Amortization | (381.6) |  | (379.5)
Carrying Value | 83.1 |  | 85.2
Petrochemical & Refined Products Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 227.4 |  | 227.4
Accumulated Amortization | (66.6) |  | (64.3)
Carrying Value | 160.8 |  | 163.1
Amortization expense | 2.3 | $ 2.4 |
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 181.4 |  | 181.4
Accumulated Amortization | (47.4) |  | (45.9)
Carrying Value | 134.0 |  | 135.5
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 46.0 |  | 46.0
Accumulated Amortization | (19.2) |  | (18.4)
Carrying Value | $ 26.8 |  | $ 27.6

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