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PROPERTY: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property |  |  |
Total property | $ 16,861.7 | $ 16,326.1 |
Accumulated depreciation, amortization and depletion | (7,490.7) | (6,922.3) |
Total property and mine development, net | 9,371.0 | 9,403.8 | $ 9,099.6
Depreciation and depletion expense | 759.9 | 668.9 | $ 665.2
Buildings and equipment |  |  |
Property |  |  |
Total property | 15,016.1 | 14,294.0 |
Construction in progress |  |  |
Property |  |  |
Total property | 1,294.8 | 1,516.9 |
Mine development |  |  |
Property |  |  |
Total property | 267.5 | 267.9 |
Mineral assets |  |  |
Property |  |  |
Total property | 83.2 | 83.2 |
Land, other than mineral |  |  |
Property |  |  |
Total property | $ 200.1 | $ 164.1 |

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