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Intangible Assets and Goodwill, Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Identifiable intangible assets [Abstract] |  |  |
Gross Value | $ 5,136.5 | $ 5,343.5 |
Accumulated Amortization | (1,687.5) | (1,735.1) |
Carrying Value | 3,449.0 | 3,608.4 | $ 3,690.3
Amortization expense | 174.7 | 170.3 | 166.9
Forecasted amortization expense [Abstract] |  |  |
2020 | 164.8 |  |
2021 | 167.0 |  |
2022 | 164.0 |  |
2023 | 162.4 |  |
2024 | 158.9 |  |
Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Carrying Value | 3,200.0 |  |
Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Carrying Value | 254.9 |  |
NGL Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 610.4 | 820.7 |
Accumulated Amortization | (250.2) | (440.6) |
Carrying Value | 360.2 | 380.1 |
Amortization expense | 31.9 | 34.7 | 28.9
NGL Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 447.8 | 457.3 |
Accumulated Amortization | (206.3) | (201.9) |
Carrying Value | 241.5 | 255.4 |
NGL Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 162.6 | 363.4 |
Accumulated Amortization | (43.9) | (238.7) |
Carrying Value | 118.7 | 124.7 |
Crude Oil Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,480.4 | 2,480.4 |
Accumulated Amortization | (478.5) | (385.8) |
Carrying Value | 2,001.9 | 2,094.6 |
Amortization expense | 92.7 | 87.8 | 92.5
Crude Oil Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 2,203.5 | 2,203.5 |
Accumulated Amortization | (243.5) | (174.1) |
Carrying Value | 1,960.0 | 2,029.4 |
Crude Oil Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 276.9 | 276.9 |
Accumulated Amortization | (235.0) | (211.7) |
Carrying Value | 41.9 | 65.2 |
Natural Gas Pipelines & Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,818.3 | 1,815.0 |
Accumulated Amortization | (877.1) | (835.7) |
Carrying Value | 941.2 | 979.3 |
Amortization expense | 41.4 | 39.1 | 36.2
Natural Gas Pipelines & Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 1,350.3 | 1,350.3 |
Accumulated Amortization | (481.6) | (447.8) |
Carrying Value | 868.7 | 902.5 |
Natural Gas Pipelines & Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 468.0 | 464.7 |
Accumulated Amortization | (395.5) | (387.9) |
Carrying Value | 72.5 | 76.8 |
Petrochemical & Refined Products Services [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 227.4 | 227.4 |
Accumulated Amortization | (81.7) | (73.0) |
Carrying Value | 145.7 | 154.4 |
Amortization expense | 8.7 | 8.7 | $ 9.3
Petrochemical & Refined Products Services [Member] | Customer relationship intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 181.4 | 181.4 |
Accumulated Amortization | (57.5) | (51.8) |
Carrying Value | 123.9 | 129.6 |
Petrochemical & Refined Products Services [Member] | Contract-based intangibles [Member] |  |  |
Identifiable intangible assets [Abstract] |  |  |
Gross Value | 46.0 | 46.0 |
Accumulated Amortization | (24.2) | (21.2) |
Carrying Value | $ 21.8 | $ 24.8 |

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