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Property, Plant and Equipment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Total historical cost of property, plant and equipment |  | $ 39,524.8 |  | $ 39,524.8 |  | $ 38,046.7
Less accumulated depreciation |  | 8,310.7 |  | 8,310.7 |  | 8,165.1
Property, plant and equipment, net |  | 31,214.1 |  | 31,214.1 |  | 29,881.6
Summary of depreciation expense and capitalized interest [Abstract] |  |  |  |  |  |
Depreciation expense | [1] | 286.2 | $ 283.2 | 870.1 | $ 822.1 |
Capitalized interest | [2] | 40.3 | $ 17.2 | 105.6 | $ 53.4 |
Asset Retirement Obligations [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 98.3 |  |
Liabilities incurred |  |  |  | 2.7 |  |
Liabilities settled |  |  |  | (5.9) |  |
Revisions in estimated cash flows |  |  |  | 49.0 |  |
Accretion expense |  |  |  | 4.2 |  |
AROs related to Offshore Business sold in July 2015 |  |  |  | (91.1) |  |
Balance at end of period |  | 57.2 |  | 57.2 |  |
Capitalized costs, asset retirement costs |  | 17.8 |  | 17.8 |  | 31.3
Matagorda Gathering System [Member] |  |  |  |  |  |
Asset Retirement Obligations [Roll Forward] |  |  |  |  |  |
Revisions in estimated cash flows |  |  |  | 39.5 |  |
Plants, pipelines and facilities [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Total historical cost of property, plant and equipment | [3] | 31,686.3 |  | $ 31,686.3 |  | 30,834.9
Plants, pipelines and facilities [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [3],[4] |  |  | 3 years |  |
Plants, pipelines and facilities [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [3],[4] |  |  | 45 years |  |
Underground and other storage facilities [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Total historical cost of property, plant and equipment | [5] | 2,847.7 |  | $ 2,847.7 |  | 2,584.2
Underground and other storage facilities [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [5],[6] |  |  | 5 years |  |
Underground and other storage facilities [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [5],[6] |  |  | 40 years |  |
Platforms and facilities [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Total historical cost of property, plant and equipment | [7] | 0.0 |  | $ 0.0 |  | 659.7
Platforms and facilities [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [7] |  |  | 20 years |  |
Platforms and facilities [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [7] |  |  | 31 years |  |
Transportation equipment [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Total historical cost of property, plant and equipment | [8] | 164.8 |  | $ 164.8 |  | 154.2
Transportation equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [8] |  |  | 3 years |  |
Transportation equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [8] |  |  | 10 years |  |
Marine vessels [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Total historical cost of property, plant and equipment | [9] | 787.5 |  | $ 787.5 |  | 796.4
Marine vessels [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [9] |  |  | 15 years |  |
Marine vessels [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life | [9] |  |  | 30 years |  |
Land [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Total historical cost of property, plant and equipment |  | 261.3 |  | $ 261.3 |  | 262.6
Construction in progress [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Total historical cost of property, plant and equipment |  | $ 3,777.2 |  | $ 3,777.2 |  | $ 2,754.7
Processing plants [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 20 years |  |
Processing plants [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 35 years |  |
Pipelines and related equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |
Pipelines and related equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 45 years |  |
Terminal facilities [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 10 years |  |
Terminal facilities [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 35 years |  |
Office furniture and equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 3 years |  |
Office furniture and equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 20 years |  |
Buildings [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 20 years |  |
Buildings [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 40 years |  |
Laboratory and shop equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |
Laboratory and shop equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 35 years |  |
Underground storage facilities [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |
Underground storage facilities [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 35 years |  |
Storage tanks [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 10 years |  |
Storage tanks [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 40 years |  |
Water wells [Member] | Minimum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |
Water wells [Member] | Maximum [Member] |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |
Estimated useful life |  |  |  | 35 years |  |
[1] | Depreciation expense is a component of "Costs and expenses" as presented on our Unaudited Condensed Statements of Consolidated Operations.
[2] | We capitalize interest costs incurred on funds used to construct property, plant and equipment while the asset is in its construction phase. The capitalized interest is recorded as part of the asset to which it relates and is amortized over the asset's estimated useful life as a component of depreciation expense. When capitalized interest is recorded, it reduces interest expense from what it would be otherwise.
[3] | Plants, pipelines and facilities include processing plants; NGL, natural gas, crude oil and petrochemical and refined products pipelines; terminal loading and unloading facilities; office furniture and equipment; buildings; laboratory and shop equipment and related assets.
[4] | In general, the estimated useful lives of major assets within this category are: processing plants, 20-35 years; pipelines and related equipment, 5-45 years; terminal facilities, 10-35 years; office furniture and equipment, 3-20 years; buildings, 20-40 years; and laboratory and shop equipment, 5-35 years.
[5] | Underground and other storage facilities include underground product storage caverns; above ground storage tanks; water wells and related assets.
[6] | In general, the estimated useful lives of assets within this category are: underground storage facilities, 5-35 years; storage tanks, 10-40 years; and water wells, 5-35 years.
[7] | Platforms and facilities included offshore platforms and related facilities and other associated assets located in the Gulf of Mexico prior to the sale of our Offshore Business (see below).
[8] | Transportation equipment includes tractor-trailer tank trucks and other vehicles and similar assets used in our operations.
[9] | Marine vessels include tow boats, barges and related equipment used in our marine transportation business.

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