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Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 5,267.2 | $ 5,273.0 |
Accumulated Amortization | (1,403.1) | (1,235.8) |
Carrying Value | 3,864.1 | 4,037.2 | $ 4,302.1
Amortization expense | 171.3 | 174.1 | 110.6
Forecasted amortization expense [Abstract] |  |  |
2017 | 161.7 |  |
2018 | 163.8 |  |
2019 | 157.7 |  |
2020 | 152.8 |  |
2021 | 163.2 |  |
Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Carrying Value | 3,500.0 |  |
Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Carrying Value | 367.6 |  |
NGL Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 727.3 | 730.4 |
Accumulated Amortization | (377.1) | (350.1) |
Carrying Value | 350.2 | 380.3 |
Amortization expense | 30.6 | 33.6 | 33.1
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 447.4 | 447.4 |
Accumulated Amortization | (172.7) | (156.9) |
Carrying Value | 274.7 | 290.5 |
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 279.9 | 283.0 |
Accumulated Amortization | (204.4) | (193.2) |
Carrying Value | 75.5 | 89.8 |
Crude Oil Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,485.4 | 2,485.8 |
Accumulated Amortization | (206.4) | (108.3) |
Carrying Value | 2,279.0 | 2,377.5 |
Amortization expense | 98.4 | 87.1 | 15.7
Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,204.4 | 2,204.4 |
Accumulated Amortization | (84.5) | (39.1) |
Carrying Value | 2,119.9 | 2,165.3 |
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 281.0 | 281.4 |
Accumulated Amortization | (121.9) | (69.2) |
Carrying Value | 159.1 | 212.2 |
Natural Gas Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,815.0 | 1,815.0 |
Accumulated Amortization | (760.5) | (727.3) |
Carrying Value | 1,054.5 | 1,087.7 |
Amortization expense | 33.2 | 40.0 | 45.0
Natural Gas Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,350.3 | 1,350.3 |
Accumulated Amortization | (390.0) | (366.3) |
Carrying Value | 960.3 | 984.0 |
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 464.7 | 464.7 |
Accumulated Amortization | (370.5) | (361.0) |
Carrying Value | 94.2 | 103.7 |
Petrochemical & Refined Products Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 239.5 | 241.8 |
Accumulated Amortization | (59.1) | (50.1) |
Carrying Value | 180.4 | 191.7 |
Amortization expense | 9.1 | 8.9 | 6.9
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 185.5 | 185.5 |
Accumulated Amortization | (43.9) | (38.3) |
Carrying Value | 141.6 | 147.2 |
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 54.0 | 56.3 |
Accumulated Amortization | (15.2) | (11.8) |
Carrying Value | 38.8 | 44.5 |
Offshore Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Amortization expense | $ 0.0 | $ 4.5 | $ 9.9

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