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PROPERTY, PLANT AND EQUIPMENT (Tables) | 3 Months Ended
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Mar. 31, 2020
Property, Plant and Equipment [Abstract] |  |
Value Of Each Of The Major Classes Of Consolidated Depreciable Assets | Depreciation and depletion is recorded over the following estimated useful lives:
Asset Class |  | Basis |  | Life
Land, land improvements and mineral rights |  |  |  |
Land and mineral rights |  | Units of production |  | Life of mine
Land improvements |  | Straight line |  | 20 to 45 years
Buildings |  | Straight line |  | 40 to 45 years
Mining and Pelletizing equipment |  | Straight line/Double declining balance |  | 3 to 20 years
Steel and Manufacturing equipment |  | Straight line/Double declining balance |  | 3 to 20 years
The following table indicates the carrying value of each of the major classes of our depreciable assets:
| (In Millions)
| March 31, 2020 |  | December 31, 2019
Land, land improvements and mineral rights | $ | 652.7 |  |  | $ | 582.2 |
Buildings | 452.5 |  |  | 157.8 |
Mining and Pelletizing equipment | 1,431.8 |  |  | 1,413.6 |
Steel and Manufacturing equipment | 2,140.9 |  |  | 42.0 |
Other | 123.0 |  |  | 101.5 |
Construction-in-progress | 1,011.3 |  |  | 730.3 |
Total property, plant and equipment 1 | 5,812.2 |  |  | 3,027.4 |
Allowance for depreciation and depletion | (1,262.4 | ) |  | (1,098.4 | )
Property, plant and equipment, net | $ | 4,549.8 |  |  | $ | 1,929.0 |
1 Includes right-of-use assets related to finance leases of $84.2 million and $49.0 million as of March 31, 2020 and December 31, 2019, respectively. | [1]
[1] | 1 Includes right-of-use assets related to finance leases of $84.2 million and $49.0 million as of March 31, 2020 and December 31, 2019, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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