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Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | $ 5,273.1 |  | $ 5,273.1 |  | $ 5,273.0
Accumulated Amortization | (1,324.8) |  | (1,324.8) |  | (1,235.8)
Carrying Value | 3,948.3 |  | 3,948.3 |  | 4,037.2
Amortization Expense | 43.0 | $ 38.7 | 89.3 | $ 77.5 |
Forecasted amortization expense [Abstract] |  |  |  |  |
Remainder of 2016 | 89.0 |  | 89.0 |  |
2017 | 176.4 |  | 176.4 |  |
2018 | 171.8 |  | 171.8 |  |
2019 | 167.3 |  | 167.3 |  |
2020 | 166.4 |  | 166.4 |  |
NGL Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 730.9 |  | 730.9 |  | 730.4
Accumulated Amortization | (365.6) |  | (365.6) |  | (350.1)
Carrying Value | 365.3 |  | 365.3 |  | 380.3
Amortization Expense | 7.7 | 7.7 | 15.5 | 15.2 |
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 447.4 |  | 447.4 |  | 447.4
Accumulated Amortization | (164.9) |  | (164.9) |  | (156.9)
Carrying Value | 282.5 |  | 282.5 |  | 290.5
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 283.5 |  | 283.5 |  | 283.0
Accumulated Amortization | (200.7) |  | (200.7) |  | (193.2)
Carrying Value | 82.8 |  | 82.8 |  | 89.8
Crude Oil Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 2,485.4 |  | 2,485.4 |  | 2,485.8
Accumulated Amortization | (160.4) |  | (160.4) |  | (108.3)
Carrying Value | 2,325.0 |  | 2,325.0 |  | 2,377.5
Amortization Expense | 24.7 | 16.6 | 52.4 | 33.3 |
Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 2,204.4 |  | 2,204.4 |  | 2,204.4
Accumulated Amortization | (63.8) |  | (63.8) |  | (39.1)
Carrying Value | 2,140.6 |  | 2,140.6 |  | 2,165.3
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 281.0 |  | 281.0 |  | 281.4
Accumulated Amortization | (96.6) |  | (96.6) |  | (69.2)
Carrying Value | 184.4 |  | 184.4 |  | 212.2
Natural Gas Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 1,815.0 |  | 1,815.0 |  | 1,815.0
Accumulated Amortization | (744.2) |  | (744.2) |  | (727.3)
Carrying Value | 1,070.8 |  | 1,070.8 |  | 1,087.7
Amortization Expense | 8.3 | 9.9 | 16.9 | 19.8 |
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 | (378.4) |  | (378.4) |  | (366.3)
Carrying Value | 971.9 |  | 971.9 |  | 984.0
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 464.7 |  | 464.7 |  | 464.7
Accumulated Amortization | (365.8) |  | (365.8) |  | (361.0)
Carrying Value | 98.9 |  | 98.9 |  | 103.7
Petrochemical & Refined Products Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 241.8 |  | 241.8 |  | 241.8
Accumulated Amortization | (54.6) |  | (54.6) |  | (50.1)
Carrying Value | 187.2 |  | 187.2 |  | 191.7
Amortization Expense | 2.3 | 2.3 | 4.5 | 4.7 |
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 185.5 |  | 185.5 |  | 185.5
Accumulated Amortization | (41.1) |  | (41.1) |  | (38.3)
Carrying Value | 144.4 |  | 144.4 |  | 147.2
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 56.3 |  | 56.3 |  | 56.3
Accumulated Amortization | (13.5) |  | (13.5) |  | (11.8)
Carrying Value | 42.8 |  | 42.8 |  | $ 44.5
Offshore Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Amortization Expense | $ 0.0 | $ 2.2 | $ 0.0 | $ 4.5 |

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