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Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | $ 5,347.6 |  | $ 5,347.6 |  | $ 5,255.1
Accumulated Amortization | (1,693.4) |  | (1,693.4) |  | (1,564.8)
Carrying Value | 3,654.2 |  | 3,654.2 |  | 3,690.3
Amortization expense | 41.9 | $ 41.4 | 128.6 | $ 123.1 |
Forecasted amortization expense [Abstract] |  |  |  |  |
Remainder of 2018 | 36.8 |  | 36.8 |  |
2019 | 151.7 |  | 151.7 |  |
2020 | 140.7 |  | 140.7 |  |
2021 | 148.4 |  | 148.4 |  |
2022 | 144.6 |  | 144.6 |  |
NGL Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 820.7 |  | 820.7 |  | 728.2
Accumulated Amortization | (431.5) |  | (431.5) |  | (405.9)
Carrying Value | 389.2 |  | 389.2 |  | 322.3
Amortization expense | 9.2 | 7.2 | 25.6 | 21.8 |
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 457.3 |  | 457.3 |  | 447.4
Accumulated Amortization | (198.4) |  | (198.4) |  | (187.5)
Carrying Value | 258.9 |  | 258.9 |  | 259.9
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 363.4 |  | 363.4 |  | 280.8
Accumulated Amortization | (233.1) |  | (233.1) |  | (218.4)
Carrying Value | 130.3 |  | 130.3 |  | 62.4
Crude Oil Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 2,484.5 |  | 2,484.5 |  | 2,484.5
Accumulated Amortization | (365.3) |  | (365.3) |  | (298.0)
Carrying Value | 2,119.2 |  | 2,119.2 |  | 2,186.5
Amortization expense | 20.7 | 22.6 | 67.3 | 68.0 |
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 | (161.8) |  | (161.8) |  | (127.0)
Carrying Value | 2,041.7 |  | 2,041.7 |  | 2,076.5
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 281.0 |  | 281.0 |  | 281.0
Accumulated Amortization | (203.5) |  | (203.5) |  | (171.0)
Carrying Value | 77.5 |  | 77.5 |  | 110.0
Natural Gas Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 1,815.0 |  | 1,815.0 |  | 1,815.0
Accumulated Amortization | (825.7) |  | (825.7) |  | (796.6)
Carrying Value | 989.3 |  | 989.3 |  | 1,018.4
Amortization expense | 9.8 | 9.3 | 29.1 | 26.3 |
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 | (439.9) |  | (439.9) |  | (417.1)
Carrying Value | 910.4 |  | 910.4 |  | 933.2
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 464.7 |  | 464.7 |  | 464.7
Accumulated Amortization | (385.8) |  | (385.8) |  | (379.5)
Carrying Value | 78.9 |  | 78.9 |  | 85.2
Petrochemical & Refined Products Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 227.4 |  | 227.4 |  | 227.4
Accumulated Amortization | (70.9) |  | (70.9) |  | (64.3)
Carrying Value | 156.5 |  | 156.5 |  | 163.1
Amortization expense | 2.2 | $ 2.3 | 6.6 | $ 7.0 |
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 181.4 |  | 181.4 |  | 181.4
Accumulated Amortization | (50.3) |  | (50.3) |  | (45.9)
Carrying Value | 131.1 |  | 131.1 |  | 135.5
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 46.0 |  | 46.0 |  | 46.0
Accumulated Amortization | (20.6) |  | (20.6) |  | (18.4)
Carrying Value | $ 25.4 |  | $ 25.4 |  | $ 27.6

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