Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Major categories of property, plant and equipment and accumulated depreciation and depletion

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

	December 31,
	2014			2013
	(millions of dollars)
Mineral rights and reserves	$	575.9			39.6
Land		44.9			24.1
Buildings		198.2			145.7
Machinery and equipment		1,121.5			956.0
Furniture and fixtures and other		153.1			88.3
Construction in progress		80.6			28.6
		2,174.2			1,282.3
Less: accumulated depreciation and depletion		(992.1	)		(976.2	)
Property, plant and equipment, net	$	1,182.1		$	306.1