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PROPERTY: (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
PROPERTY: |
Schedule of major classes of property, plant and equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31,
(in millions) |  | 2020 |  | 2019
Buildings and equipment | ​ | $ | 15,561.9 | ​ | $ | 15,016.1
Construction in progress | ​ |  | 1,481.6 | ​ |  | 1,294.8
Mine development | ​ |  | 272.8 | ​ |  | 267.5
Mineral assets | ​ | ​ | 83.2 | ​ | ​ | 83.2
Land, other than mineral | ​ |  | 235.8 | ​ |  | 200.1
Total property | ​ |  | 17,635.3 | ​ |  | 16,861.7
Accumulated depreciation, amortization and depletion | ​ |  | (8,176.6) | ​ |  | (7,490.7)
Total property and mine development, net | ​ | $ | 9,458.7 | ​ | $ | 9,371.0

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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://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=120391452&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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