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PROPERTY: | 12 Months Ended
--- | ---
Dec. 31, 2022
PROPERTY: |
PROPERTY: | NOTE 5—PROPERTY: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31,
(in millions) |  | 2022 |  | 2021
Buildings and equipment | ​ | $ | 16,718.3 | ​ | $ | 15,993.8
Construction in progress | ​ |  | 1,747.0 | ​ |  | 1,668.0
Mine development | ​ |  | 273.2 | ​ |  | 273.2
Mineral assets | ​ | ​ | 83.2 | ​ | ​ | 83.2
Land, other than mineral | ​ |  | 275.4 | ​ |  | 258.6
Total property | ​ |  | 19,097.1 | ​ |  | 18,276.8
Accumulated depreciation, amortization and depletion | ​ |  | (9,500.5) | ​ |  | (8,812.4)
Total property and mine development, net | ​ | $ | 9,596.6 | ​ | $ | 9,464.4
​ Depreciation and depletion expense for the years ended December 31, 2022, 2021 and 2020, amounted to $790.3 million, $797.3 million and $766.4 million, respectively.

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