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PROPERTY: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Property |  |  |
Total property | $ 13,456.3 | $ 12,284.7 |
Accumulated depreciation, amortization and depletion | (5,193.5) | (4,848.3) |
Total property and mine development, net | 8,262.8 | 7,436.4 | $ 6,476.2
Depreciation and depletion expense | 503.6 | 440.1 | $ 393.6
Buildings and equipment |  |  |
Property |  |  |
Total property | 11,529.4 | 9,754.0 |
Construction in progress |  |  |
Property |  |  |
Total property | 1,449.6 | 2,175.6 |
Mine development |  |  |
Property |  |  |
Total property | 265.9 | 255.0 |
Mineral assets |  |  |
Property |  |  |
Total property | 93.0 |  |
Land, other than mineral |  |  |
Property |  |  |
Total property | $ 118.4 | $ 100.1 |

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