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Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | $ 5,273.0 | $ 5,548.4 |
Accumulated Amortization |  | (1,235.8) | (1,246.3) |
Carrying Value |  | 4,037.2 | 4,302.1 | $ 1,462.2
Amortization Expense |  | 174.1 | 110.6 | 105.6
Forecasted amortization expense [Abstract] |  |  |  |
2016 |  | 181.6 |  |
2017 |  | 177.4 |  |
2018 |  | 171.6 |  |
2019 |  | 167.0 |  |
2020 |  | 166.3 |  |
Customer relationship intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Carrying Value |  | 3,590.0 |  |
Contract-based intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Carrying Value |  | 450.2 |  |
Incentive distribution rights [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Carrying Value |  |  | 1,460.0 |
NGL Pipelines & Services [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 730.4 | 1,051.1 |
Accumulated Amortization |  | (350.1) | (361.9) |
Carrying Value |  | 380.3 | 689.2 |
Amortization Expense |  | 33.6 | 33.1 | 36.4
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 447.4 | 340.8 |
Accumulated Amortization |  | (156.9) | (183.2) |
Carrying Value |  | 290.5 | 157.6 |
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 283.0 | 277.7 |
Accumulated Amortization |  | (193.2) | (178.7) |
Carrying Value |  | 89.8 | 99.0 |
NGL Pipelines & Services [Member] | Incentive distribution rights [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value | [1] | 0.0 | 432.6 |
Accumulated Amortization | [1] | 0.0 | 0.0 |
Carrying Value | [1] | 0.0 | 432.6 |
Crude Oil Pipelines & Services [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 2,485.8 | 2,244.8 |
Accumulated Amortization |  | (108.3) | (21.2) |
Carrying Value |  | 2,377.5 | 2,223.6 |
Amortization Expense |  | 87.1 | 15.7 | 1.4
Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 2,204.4 | 1,108.0 |
Accumulated Amortization |  | (39.1) | (7.7) |
Carrying Value |  | 2,165.3 | 1,100.3 |
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 281.4 | 281.4 |
Accumulated Amortization |  | (69.2) | (13.5) |
Carrying Value |  | 212.2 | 267.9 |
Crude Oil Pipelines & Services [Member] | Incentive distribution rights [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value | [1] | 0.0 | 855.4 |
Accumulated Amortization | [1] | 0.0 | 0.0 |
Carrying Value | [1] | 0.0 | 855.4 |
Natural Gas Pipelines & Services [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 1,815.0 | 1,629.6 |
Accumulated Amortization |  | (727.3) | (656.7) |
Carrying Value |  | 1,087.7 | 972.9 |
Amortization Expense |  | 40.0 | 45.0 | 50.1
Natural Gas Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 1,350.3 | 1,163.6 |
Accumulated Amortization |  | (366.3) | (308.9) |
Carrying Value |  | 984.0 | 854.7 |
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 464.7 | 466.0 |
Accumulated Amortization |  | (361.0) | (347.8) |
Carrying Value |  | 103.7 | 118.2 |
Petrochemical & Refined Products Services [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 241.8 | 425.9 |
Accumulated Amortization |  | (50.1) | (51.1) |
Carrying Value |  | 191.7 | 374.8 |
Amortization Expense |  | 8.9 | 6.9 | 6.2
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 185.5 | 198.4 |
Accumulated Amortization |  | (38.3) | (43.3) |
Carrying Value |  | 147.2 | 155.1 |
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value |  | 56.3 | 56.3 |
Accumulated Amortization |  | (11.8) | (7.8) |
Carrying Value |  | 44.5 | 48.5 |
Petrochemical & Refined Products Services [Member] | Incentive distribution rights [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value | [1] | 0.0 | 171.2 |
Accumulated Amortization | [1] | 0.0 | 0.0 |
Carrying Value | [1] | 0.0 | 171.2 |
Offshore Pipelines & Services [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value | [2] | 0.0 | 197.0 |
Accumulated Amortization | [2] | 0.0 | (155.4) |
Carrying Value | [2] | 0.0 | 41.6 |
Amortization Expense |  | 4.5 | 9.9 | $ 11.5
Offshore Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value | [2] | 0.0 | 195.8 |
Accumulated Amortization | [2] | 0.0 | (154.9) |
Carrying Value | [2] | 0.0 | 40.9 |
Offshore Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |
Gross Value | [2] | 0.0 | 1.2 |
Accumulated Amortization | [2] | 0.0 | (0.5) |
Carrying Value | [2] | $ 0.0 | $ 0.7 |
[1] | We recorded intangible assets having an aggregate carrying value of $1.46 billion in connection with our October 2014 acquisition of the IDRs of Oiltanking. The IDRs represented contractual rights to future cash incentive distributions to be paid by Oiltanking. These rights were granted to Oiltanking GP under the terms of Oiltanking's partnership agreement. Oiltanking GP could separate and sell the IDRs independent of its other residual general partner interest in Oiltanking. In February 2015 (following completion of Step 2 of the Oiltanking acquisition), the Oiltanking IDRs were cancelled and the carrying value of this intangible asset was reclassified to goodwill.
[2] | Our intangible assets classified within the Offshore Pipelines & Services segment were sold to Genesis in July 2015 (see Note 5).

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