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Property, Plant and Equipment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Property, plant and equipment, gross |  | $ 58,332.1 |  | $ 58,332.1 |  |  | $ 57,497.5
Less accumulated depreciation |  | 16,191.5 |  | 16,191.5 |  |  | 15,584.7
Subtotal property, plant, and equipment, net |  | 42,140.6 |  | 42,140.6 |  |  | 41,912.8
Capitalized major maintenance costs for reaction-based plants, net of accumulated amortization | [1] | 92.5 |  | 92.5 |  |  | 0.0
Property, plant and equipment, net |  | 42,233.1 |  | 42,233.1 |  |  | 41,912.8
Summary of depreciation expense and capitalized interest [Abstract] |  |  |  |  |  |  |
Depreciation expense | [2] | 424.0 | $ 418.7 | 847.7 |  | $ 830.9 |
Capitalized interest | [3] | 21.2 | 31.9 | 40.8 |  | 62.4 |
Asset Retirement Obligations [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 149.5 |  |  |
Liabilities incurred | [4] |  |  | 6.2 |  |  |
Revisions in estimated cash flows | [5] |  |  | 4.0 |  |  |
Liabilities settled | [6] |  |  | (0.3) |  |  |
Accretion expense | [2] | 2.1 | $ 8.4 | 3.8 | [7] | 10.2 |
Balance at end of period |  | 163.2 |  | 163.2 |  |  |
Asset retirement obligation, current liability |  | 11.5 |  | 11.5 |  |  |
Asset retirement obligations, long-term liability |  | 151.7 |  | 151.7 |  |  |
Capitalized costs, asset retirement costs |  | 78.9 |  | 78.9 |  |  | 69.7
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  | 6.8 |  |  |
Proceeds from asset sales |  |  |  | 50.3 |  | $ 4.1 |
Plants, pipelines and facilities [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Property, plant and equipment, gross | [8] | 50,419.7 |  | $ 50,419.7 |  |  | 49,972.8
Plants, pipelines and facilities [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Estimated useful life | [8],[9] |  |  | 3 years |  |  |
Plants, pipelines and facilities [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Estimated useful life | [8],[9] |  |  | 45 years |  |  |
Underground and other storage facilities [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Property, plant and equipment, gross | [10] | 4,240.9 |  | $ 4,240.9 |  |  | 4,207.5
Underground and other storage facilities [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Estimated useful life | [10],[11] |  |  | 5 years |  |  |
Underground and other storage facilities [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Estimated useful life | [10],[11] |  |  | 40 years |  |  |
Transportation equipment [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Property, plant and equipment, gross | [12] | 209.4 |  | $ 209.4 |  |  | 204.9
Transportation equipment [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Estimated useful life | [12] |  |  | 3 years |  |  |
Transportation equipment [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Estimated useful life | [12] |  |  | 10 years |  |  |
Marine vessels [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Property, plant and equipment, gross | [13] | 930.0 |  | $ 930.0 |  |  | 932.7
Marine vessels [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Estimated useful life | [13] |  |  | 15 years |  |  |
Marine vessels [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Estimated useful life | [13] |  |  | 30 years |  |  |
Land [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Property, plant and equipment, gross |  | 383.0 |  | $ 383.0 |  |  | 371.9
Construction in progress [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Property, plant and equipment, gross |  | $ 2,149.1 |  | $ 2,149.1 |  |  | $ 1,807.7
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
Capitalized Major Maintenance [Member] | Weighted Average [Member] |  |  |  |  |  |  |
Property, plant and equipment and accumulated depreciation [Abstract] |  |  |  |  |  |  |
Expected remaining amortization period |  |  |  | 2 years 10 months 24 days |  |  |
Coal bed natural gas gathering system and related Val Verde treating facility [Member] |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Impairment of long-lived assets held for sale |  |  |  | $ 44.3 |  |  |
Impairment of property, plant and equipment |  |  |  | 37.5 |  |  |
Impairment of intangible assets |  |  |  | 6.8 |  |  |
Proceeds from asset sales |  |  |  | $ 39.1 |  |  |
[1] | For reaction-based plants, we use the deferral method when accounting for major maintenance activities. Under the deferral method, major maintenance costs are capitalized and amortized over the period until the next major overhaul project. On a weighted-average basis, the expected amortization period for these costs is 2.9 years.
[2] | Depreciation and accretion expense is a component of “Third party and other costs” within “Costs and expenses” as presented on our Unaudited Condensed Statements of Consolidated Operations.
[3] | 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.
[4] | Represents the initial recognition of estimated ARO liabilities during period.
[5] | Represents subsequent adjustments to estimated ARO liabilities during period.
[6] | Represents cash payments to settle ARO liabilities during period.
[7] | Represents net change in ARO liability balance attributable to the passage of time and other adjustments, including true-up amounts associated with revised closure estimates.
[8] | Plants, pipelines and facilities include processing plants; NGL, natural gas, crude oil and petrochemical and refined products pipelines; terminal loading and unloading facilities; buildings; office furniture and equipment; laboratory and shop equipment and related assets.
[9] | 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; buildings, 20-40 years; office furniture and equipment, 3-20 years; and laboratory and shop equipment, 5-35 years.
[10] | Underground and other storage facilities include underground product storage caverns; above ground storage tanks; water wells and related assets.
[11] | 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.
[12] | Transportation equipment includes tractor-trailer tank trucks and other vehicles and similar assets used in our operations.
[13] | Marine vessels include tow boats, barges and related equipment used in our marine transportation business.

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