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Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | $ 5,136.5 |  | $ 5,136.5 |  | $ 5,343.5
Accumulated Amortization | (1,647.1) |  | (1,647.1) |  | (1,735.1)
Carrying Value | 3,489.4 |  | 3,489.4 |  | 3,608.4
Amortization expense | 44.8 | $ 41.9 | 134.3 | $ 128.6 |
Forecasted amortization expense [Abstract] |  |  |  |  |
Remainder of 2019 | 40.5 |  | 40.5 |  |
2020 | 161.8 |  | 161.8 |  |
2021 | 162.8 |  | 162.8 |  |
2022 | 168.4 |  | 168.4 |  |
2023 | 168.5 |  | 168.5 |  |
NGL Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 610.4 |  | 610.4 |  | 820.7
Accumulated Amortization | (243.7) |  | (243.7) |  | (440.6)
Carrying Value | 366.7 |  | 366.7 |  | 380.1
Amortization expense | 7.3 | 9.2 | 25.4 | 25.6 |
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 447.8 |  | 447.8 |  | 457.3
Accumulated Amortization | (202.8) |  | (202.8) |  | (201.9)
Carrying Value | 245.0 |  | 245.0 |  | 255.4
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 162.6 |  | 162.6 |  | 363.4
Accumulated Amortization | (40.9) |  | (40.9) |  | (238.7)
Carrying Value | 121.7 |  | 121.7 |  | 124.7
Crude Oil Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 2,480.4 |  | 2,480.4 |  | 2,480.4
Accumulated Amortization | (457.0) |  | (457.0) |  | (385.8)
Carrying Value | 2,023.4 |  | 2,023.4 |  | 2,094.6
Amortization expense | 25.1 | 20.7 | 71.2 | 67.3 |
Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 2,203.5 |  | 2,203.5 |  | 2,203.5
Accumulated Amortization | (226.9) |  | (226.9) |  | (174.1)
Carrying Value | 1,976.6 |  | 1,976.6 |  | 2,029.4
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 276.9 |  | 276.9 |  | 276.9
Accumulated Amortization | (230.1) |  | (230.1) |  | (211.7)
Carrying Value | 46.8 |  | 46.8 |  | 65.2
Natural Gas Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 1,818.3 |  | 1,818.3 |  | 1,815.0
Accumulated Amortization | (866.9) |  | (866.9) |  | (835.7)
Carrying Value | 951.4 |  | 951.4 |  | 979.3
Amortization expense | 10.3 | 9.8 | 31.2 | 29.1 |
Natural Gas Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 1,350.3 |  | 1,350.3 |  | 1,350.3
Accumulated Amortization | (473.3) |  | (473.3) |  | (447.8)
Carrying Value | 877.0 |  | 877.0 |  | 902.5
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 468.0 |  | 468.0 |  | 464.7
Accumulated Amortization | (393.6) |  | (393.6) |  | (387.9)
Carrying Value | 74.4 |  | 74.4 |  | 76.8
Petrochemical & Refined Products Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 227.4 |  | 227.4 |  | 227.4
Accumulated Amortization | (79.5) |  | (79.5) |  | (73.0)
Carrying Value | 147.9 |  | 147.9 |  | 154.4
Amortization expense | 2.1 | $ 2.2 | 6.5 | $ 6.6 |
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 181.4 |  | 181.4 |  | 181.4
Accumulated Amortization | (56.2) |  | (56.2) |  | (51.8)
Carrying Value | 125.2 |  | 125.2 |  | 129.6
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 46.0 |  | 46.0 |  | 46.0
Accumulated Amortization | (23.3) |  | (23.3) |  | (21.2)
Carrying Value | $ 22.7 |  | $ 22.7 |  | $ 24.8

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