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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment and Accumulated Depreciation | The historical costs of our property, plant and equipment and related accumulated depreciation balances were as follows at the dates indicated:
|  | Estimated Useful Life |  |  | December 31, |
|  | in Years |  |  | 2018 |  |  | 2017 |
Plants, pipelines and facilities (1) |  | 3-45 (5) |  |  | $ | 42,371.0 |  |  | $ | 37,132.2 |
Underground and other storage facilities (2) |  | 5-40 (6) |  |  |  | 3,624.2 |  |  |  | 3,460.9 |
Transportation equipment (3) |  | 3-10 |  |  |  | 187.1 |  |  |  | 177.1 |
Marine vessels (4) |  | 15-30 |  |  |  | 828.6 |  |  |  | 803.8 |
Land |  |  |  |  |  |  | 359.5 |  |  |  | 273.1 |
Construction in progress |  |  |  |  |  |  | 3,526.8 |  |  |  | 4,698.1 |
Total |  |  |  |  |  |  | 50,897.2 |  |  |  | 46,545.2 |
Less accumulated depreciation |  |  |  |  |  |  | 12,159.6 |  |  |  | 10,924.8 |
Property, plant and equipment, net |  |  |  |  |  | $ | 38,737.6 |  |  | $ | 35,620.4 |
(1) 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. We placed a number of growth projects into service since December 31, 2017 including a propane dehydrogenation facility at our Mont Belvieu complex, the first two processing trains at our Orla natural gas processing facility, and a ninth NGL fractionator in Chambers County, Texas at our Mont Belvieu NGL fractionation complex. (2) Underground and other storage facilities include underground product storage caverns; above ground storage tanks; water wells and related assets. (3) Transportation equipment includes tractor-trailer tank trucks and other vehicles and similar assets used in our operations. (4) Marine vessels include tow boats, barges and related equipment used in our marine transportation business. (5) 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. (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. |
Depreciation Expense and Capitalized Interest | The following table summarizes our depreciation expense and capitalized interest amounts for the years indicated:
|  | For the Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Depreciation expense (1) |  | $ | 1,436.2 |  |  | $ | 1,296.1 |  |  | $ | 1,215.7 |
Capitalized interest (2) |  |  | 147.9 |  |  |  | 192.1 |  |  |  | 168.2 |
(1)Depreciation expense is a component of “Costs and expenses” as presented on our Statements of Consolidated Operations. (2)Capitalized interest is a component of “Interest expense” as presented on our Statements of Consolidated Operations. |
AROs | The following table presents information regarding our AROs for the years indicated:
|  | For the Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
ARO liability beginning balance |  | $ | 86.7 |  |  | $ | 85.4 |  |  | $ | 58.5 |
Liabilities incurred |  |  | 24.4 |  |  |  | 4.7 |  |  |  | 4.2 |
Liabilities settled |  |  | (2.5 | ) |  |  | (2.2 | ) |  |  | (5.7 | )
Revisions in estimated cash flows |  |  | 11.5 |  |  |  | (6.7 | ) |  |  | 24.6 |
Accretion expense |  |  | 6.2 |  |  |  | 5.5 |  |  |  | 3.8 |
ARO liability ending balance |  | $ | 126.3 |  |  | $ | 86.7 |  |  | $ | 85.4 |
Forecasted Accretion Expense Associated with AROs | The following table presents our forecast of ARO-related accretion expense for the years indicated:
2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |
$ | 8.1 |  |  | $ | 8.6 |  |  | $ | 9.0 |  |  | $ | 9.6 |  |  | $ | 10.3 |

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