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PROPERTY: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property
Total property	$ 15,424.2	$ 14,473.3
Accumulated depreciation, amortization and depletion	(6,324.6)	(5,706.8)
Total property and mine development, net	9,099.6	8,766.5	$ 8,262.8
Depreciation and depletion expense	665.2	639.1	$ 503.6
Buildings and equipment
Property
Total property	12,552.8	12,177.1
Construction in progress
Property
Total property	2,301.9	1,811.8
Mine development
Property
Total property	267.9	259.1
Mineral assets
Property
Total property	83.2	83.2
Land, other than mineral
Property
Total property	$ 218.4	$ 142.1

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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