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Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 5,345.2 |  | $ 5,343.5
Accumulated Amortization | (1,779.3) |  | (1,735.1)
Carrying Value | 3,565.9 |  | 3,608.4
Amortization expense | 44.2 | $ 43.1 |
Forecasted amortization expense [Abstract] |  |  |
Remainder of 2019 | 124.3 |  |
2020 | 160.2 |  |
2021 | 162.4 |  |
2022 | 168.0 |  |
2023 | 168.1 |  |
NGL Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 820.7 |  | 820.7
Accumulated Amortization | (449.7) |  | (440.6)
Carrying Value | 371.0 |  | 380.1
Amortization expense | 9.1 | 7.1 |
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 457.3 |  | 457.3
Accumulated Amortization | (205.4) |  | (201.9)
Carrying Value | 251.9 |  | 255.4
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 363.4 |  | 363.4
Accumulated Amortization | (244.3) |  | (238.7)
Carrying Value | 119.1 |  | 124.7
Crude Oil Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,480.4 |  | 2,480.4
Accumulated Amortization | (407.8) |  | (385.8)
Carrying Value | 2,072.6 |  | 2,094.6
Amortization expense | 22.0 | 24.0 |
Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,203.5 |  | 2,203.5
Accumulated Amortization | (189.7) |  | (174.1)
Carrying Value | 2,013.8 |  | 2,029.4
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 276.9 |  | 276.9
Accumulated Amortization | (218.1) |  | (211.7)
Carrying Value | 58.8 |  | 65.2
Natural Gas Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,816.7 |  | 1,815.0
Accumulated Amortization | (846.6) |  | (835.7)
Carrying Value | 970.1 |  | 979.3
Amortization expense | 10.9 | 9.7 |
Natural Gas Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,350.3 |  | 1,350.3
Accumulated Amortization | (456.9) |  | (447.8)
Carrying Value | 893.4 |  | 902.5
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 466.4 |  | 464.7
Accumulated Amortization | (389.7) |  | (387.9)
Carrying Value | 76.7 |  | 76.8
Petrochemical & Refined Products Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 227.4 |  | 227.4
Accumulated Amortization | (75.2) |  | (73.0)
Carrying Value | 152.2 |  | 154.4
Amortization expense | 2.2 | $ 2.3 |
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 181.4 |  | 181.4
Accumulated Amortization | (53.2) |  | (51.8)
Carrying Value | 128.2 |  | 129.6
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 46.0 |  | 46.0
Accumulated Amortization | (22.0) |  | (21.2)
Carrying Value | $ 24.0 |  | $ 24.8

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