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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2015
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 |  |  | 2015 |  |  | 2014 |
Plants, pipelines and facilities (1) |  | 3-45 (6) |  |  | $ | 32,525.0 |  |  | $ | 30,834.9 |
Underground and other storage facilities (2) |  | 5-40 (7) |  |  |  | 3,000.5 |  |  |  | 2,584.2 |
Platforms and facilities (3) |  | 20-31 |  |  |  | -- |  |  |  | 659.7 |
Transportation equipment (4) |  | 3-10 |  |  |  | 159.9 |  |  |  | 154.2 |
Marine vessels (5) |  | 15-30 |  |  |  | 769.8 |  |  |  | 796.4 |
Land |  |  |  |  |  |  | 262.7 |  |  |  | 262.6 |
Construction in progress |  |  |  |  |  |  | 3,894.0 |  |  |  | 2,754.7 |
Total |  |  |  |  |  |  | 40,611.9 |  |  |  | 38,046.7 |
Less accumulated depreciation |  |  |  |  |  |  | 8,577.2 |  |  |  | 8,165.1 |
Property, plant and equipment, net |  |  |  |  |  | $ | 32,034.7 |  |  | $ | 29,881.6 |
(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. (2) Underground and other storage facilities include underground product storage caverns; above ground storage tanks; water wells and related assets. (3) 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. (4) Transportation equipment includes tractor-trailer tank trucks and other vehicles and similar assets used in our operations. (5) Marine vessels include tow boats, barges and related equipment used in our marine transportation business. (6) 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. (7) 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 periods indicated:
|  | For the Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Depreciation expense (1) |  | $ | 1,161.6 |  |  | $ | 1,114.1 |  |  | $ | 1,012.4 |
Capitalized interest (2) |  |  | 149.1 |  |  |  | 77.9 |  |  |  | 133.0 |
(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 periods indicated:
|  | For the Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
ARO liability beginning balance |  | $ | 98.3 |  |  | $ | 90.2 |  |  | $ | 105.2 |
Liabilities incurred |  |  | 2.7 |  |  |  | 0.1 |  |  |  | 1.7 |
Liabilities settled |  |  | (6.3 | ) |  |  | (2.7 | ) |  |  | (14.2 | )
Revisions in estimated cash flows |  |  | 49.7 |  |  |  | 4.6 |  |  |  | (8.6 | )
Accretion expense |  |  | 5.2 |  |  |  | 6.1 |  |  |  | 6.1 |
AROs related to Offshore Business sold in July 2015 |  |  | (91.1 | ) |  |  | -- |  |  |  | -- |
ARO liability ending balance |  | $ | 58.5 |  |  | $ | 98.3 |  |  | $ | 90.2 |
Forecasted Accretion Expense Associated with AROs | The following table presents our forecast of accretion expense for the periods indicated:
2016 |  |  | 2017 |  |  | 2018 |  |  | 2019 |  |  | 2020
$ | 3.7 |  |  | $ | 4.0 |  |  | $ | 4.3 |  |  | $ | 4.7 |  |  | $ | 5.0

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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