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PROPERTY: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property
Total property	$ 16,326.1	$ 15,424.2
Accumulated depreciation, amortization and depletion	(6,922.3)	(6,324.6)
Total property and mine development, net	9,403.8	9,099.6	$ 8,766.5
Depreciation and depletion expense	668.9	665.2	$ 639.1
Buildings and equipment
Property
Total property	14,294.0	12,552.8
Construction in progress
Property
Total property	1,516.9	2,301.9
Mine development
Property
Total property	267.9	267.9
Mineral assets
Property
Total property	83.2	83.2
Land, other than mineral
Property
Total property	$ 164.1	$ 218.4

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets or depleting assets to periods that benefit from use of the assets.

+ References

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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