Property, Plant, Equipment and Mineral Rights and Reserves (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant, Equipment and Mineral Rights and Reserves [Abstract]

Property, plant, equipment and mineral rights and reserves

Property, plant, equipment and mineral rights and reserves consisted of the following:

	December 31,
	2013		2012
Mineral rights and reserves	$	5.0	$	48.6
Land		10.7		13.0
Buildings and improvements		87.9		104.9
Machinery and equipment		437.4		414.5
Construction in progress		47.9		32.6
		588.9		613.6

Range of useful lives to depreciate plant and equipment

The range of useful lives to depreciate plant and equipment is as follows:

Buildings and improvements	3-50 years
Machinery and equipment	1-24 years

Depreciation and depletion charged to income

Depreciation and depletion were charged to income as follows:

	2013		2012		2011
Depreciation expense	$	44.1	$	39.3	$	35.0
Depletion expense		1.5		1.6		2.6
		45.6		40.9		37.6