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Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | $ 5,266.3 |  | $ 5,266.3 |  | $ 5,267.2
Accumulated Amortization | (1,483.9) |  | (1,483.9) |  | (1,403.1)
Carrying Value | 3,782.4 |  | 3,782.4 |  | 3,864.1
Amortization expense | 40.7 | $ 43.0 | 81.7 | $ 89.3 |
Forecasted amortization expense [Abstract] |  |  |  |  |
Remainder of 2017 | 81.1 |  | 81.1 |  |
2018 | 163.8 |  | 163.8 |  |
2019 | 157.7 |  | 157.7 |  |
2020 | 152.8 |  | 152.8 |  |
2021 | 163.2 |  | 163.2 |  |
NGL Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 727.3 |  | 727.3 |  | 727.3
Accumulated Amortization | (391.7) |  | (391.7) |  | (377.1)
Carrying Value | 335.6 |  | 335.6 |  | 350.2
Amortization expense | 7.3 | 7.7 | 14.6 | 15.5 |
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 447.4 |  | 447.4 |  | 447.4
Accumulated Amortization | (180.0) |  | (180.0) |  | (172.7)
Carrying Value | 267.4 |  | 267.4 |  | 274.7
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 279.9 |  | 279.9 |  | 279.9
Accumulated Amortization | (211.7) |  | (211.7) |  | (204.4)
Carrying Value | 68.2 |  | 68.2 |  | 75.5
Crude Oil Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 2,484.5 |  | 2,484.5 |  | 2,485.4
Accumulated Amortization | (250.9) |  | (250.9) |  | (206.4)
Carrying Value | 2,233.6 |  | 2,233.6 |  | 2,279.0
Amortization expense | 22.3 | 24.7 | 45.4 | 52.4 |
Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 2,203.5 |  | 2,203.5 |  | 2,204.4
Accumulated Amortization | (104.4) |  | (104.4) |  | (84.5)
Carrying Value | 2,099.1 |  | 2,099.1 |  | 2,119.9
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 281.0 |  | 281.0 |  | 281.0
Accumulated Amortization | (146.5) |  | (146.5) |  | (121.9)
Carrying Value | 134.5 |  | 134.5 |  | 159.1
Natural Gas Pipelines & Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 1,815.0 |  | 1,815.0 |  | 1,815.0
Accumulated Amortization | (777.5) |  | (777.5) |  | (760.5)
Carrying Value | 1,037.5 |  | 1,037.5 |  | 1,054.5
Amortization expense | 8.8 | 8.3 | 17.0 | 16.9 |
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 | (402.5) |  | (402.5) |  | (390.0)
Carrying Value | 947.8 |  | 947.8 |  | 960.3
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 464.7 |  | 464.7 |  | 464.7
Accumulated Amortization | (375.0) |  | (375.0) |  | (370.5)
Carrying Value | 89.7 |  | 89.7 |  | 94.2
Petrochemical & Refined Products Services [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 239.5 |  | 239.5 |  | 239.5
Accumulated Amortization | (63.8) |  | (63.8) |  | (59.1)
Carrying Value | 175.7 |  | 175.7 |  | 180.4
Amortization expense | 2.3 | $ 2.3 | 4.7 | $ 4.5 |
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 185.5 |  | 185.5 |  | 185.5
Accumulated Amortization | (46.9) |  | (46.9) |  | (43.9)
Carrying Value | 138.6 |  | 138.6 |  | 141.6
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |  |  |
Identifiable intangible assets [Abstract] |  |  |  |  |
Gross Value | 54.0 |  | 54.0 |  | 54.0
Accumulated Amortization | (16.9) |  | (16.9) |  | (15.2)
Carrying Value | $ 37.1 |  | $ 37.1 |  | $ 38.8

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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