PROPERTY: (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of major classes of property, plant and equipment

	As of December 31,
(in millions)	2012			2011
Buildings and equipment	$	7,497.3		$	6,921.8
Construction in progress	1,617.6			1,197.8
Mine development	250.7			250.7
Land, other than mineral	46.7			46.4
Total property	9,412.3			8,416.7
Accumulated depreciation, amortization and depletion	(4,255.6		)	(3,986.8		)
Total property, net	$	5,156.7		$	4,429.9

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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