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Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 5,255.1 | $ 5,267.2 |
Accumulated Amortization | (1,564.8) | (1,403.1) |
Carrying Value | 3,690.3 | 3,864.1 | $ 4,037.2
Amortization expense | 166.9 | 171.3 | 174.1
Forecasted amortization expense [Abstract] |  |  |
2018 | 174.5 |  |
2019 | 165.8 |  |
2020 | 150.7 |  |
2021 | 145.6 |  |
2022 | 141.6 |  |
Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Carrying Value | 3,410.0 |  |
Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Carrying Value | 285.2 |  |
NGL Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 728.2 | 727.3 |
Accumulated Amortization | (405.9) | (377.1) |
Carrying Value | 322.3 | 350.2 |
Amortization expense | 28.9 | 30.6 | 33.6
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 447.4 | 447.4 |
Accumulated Amortization | (187.5) | (172.7) |
Carrying Value | 259.9 | 274.7 |
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 280.8 | 279.9 |
Accumulated Amortization | (218.4) | (204.4) |
Carrying Value | 62.4 | 75.5 |
Crude Oil Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,484.5 | 2,485.4 |
Accumulated Amortization | (298.0) | (206.4) |
Carrying Value | 2,186.5 | 2,279.0 |
Amortization expense | 92.5 | 98.4 | 87.1
Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,203.5 | 2,204.4 |
Accumulated Amortization | (127.0) | (84.5) |
Carrying Value | 2,076.5 | 2,119.9 |
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 281.0 | 281.0 |
Accumulated Amortization | (171.0) | (121.9) |
Carrying Value | 110.0 | 159.1 |
Natural Gas Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,815.0 | 1,815.0 |
Accumulated Amortization | (796.6) | (760.5) |
Carrying Value | 1,018.4 | 1,054.5 |
Amortization expense | 36.2 | 33.2 | 40.0
Natural Gas Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,350.3 | 1,350.3 |
Accumulated Amortization | (417.1) | (390.0) |
Carrying Value | 933.2 | 960.3 |
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 464.7 | 464.7 |
Accumulated Amortization | (379.5) | (370.5) |
Carrying Value | 85.2 | 94.2 |
Petrochemical & Refined Products Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 227.4 | 239.5 |
Accumulated Amortization | (64.3) | (59.1) |
Carrying Value | 163.1 | 180.4 |
Amortization expense | 9.3 | 9.1 | 8.9
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 181.4 | 185.5 |
Accumulated Amortization | (45.9) | (43.9) |
Carrying Value | 135.5 | 141.6 |
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 46.0 | 54.0 |
Accumulated Amortization | (18.4) | (15.2) |
Carrying Value | 27.6 | 38.8 |
Offshore Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization expense | $ 0.0 | $ 0.0 | $ 4.5

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