Property, Plant and Equipment

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Note 9. Property, Plant and Equipment

The major categories of property, plant and equipment and accumulated depreciation and depletion are presented below:

	December 31,
	2015			2014
	(millions of dollars)
Mineral rights and reserves	$	553.8		$	575.9
Land		39.8			44.9
Buildings		179.7			198.2
Machinery and equipment		1,130.7			1,121.5
Furniture and fixtures and other		209.7			153.1
Construction in progress		53.6			80.6
		2,167.3			2,174.2
Less: accumulated depreciation and depletion		(1,063.0	)		(992.1	)
Property, plant and equipment, net	$	1,104.3		$	1,182.1

Depreciation and depletion expense for the years ended December 31, 2015, 2014 and 2013 was $82.1 million, $76.6 million and $44.7 million, respectively.