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PROPERTY: (Tables)

12 Months Ended

Dec. 31, 2016

PROPERTY:

Schedule of major classes of property, plant and equipment

		At December 31,
(in millions)		2016			2015
Buildings and equipment		$	12,177.1		$	11,529.4
Construction in progress			1,811.8			1,449.6
Mine development			259.1			265.9
Mineral assets			83.2			93.0
Land, other than mineral			142.1			118.4
​	​	​	​	​	​	​	​
Total property			14,473.3			13,456.3
Accumulated depreciation, amortization and depletion			(5,706.8	)		(5,193.5	)
​	​	​	​	​	​	​	​
Total property and mine development, net		$	8,766.5		$	8,262.8
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

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- References

No definition available.

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- Definition

Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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