Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2012

Business Segment Information [Abstract]

Segment disclosure

	Three Months Ended March  31,
	2012			2011
Net sales:
Minerals and materials	$	125.5		$	116.9
Environmental		51.1			50.7
Oilfield services		55.3			44.7
Transportation		11.1			12.7
Intersegment sales		(7.2	)		(7.2	)
Total	$	235.8		$	217.8
Operating profit (loss):
Minerals and materials	$	21.6		$	16.2
Environmental		0.9			2.3
Oilfield services		4.8			4.9
Transportation		0.2			0.5
Corporate		(6.0	)		(5.3	)
Total	$	21.5		$	18.6
	As of Mar. 31, 2012			As of Dec. 31, 2011
Assets:
Minerals and materials	$	425.2		$	422.1
Environmental		166.6			161.4
Oilfield services		189.6			194.4
Transportation		3.9			3.9
Corporate		64.8			60.9
Total	$	850.1		$	842.7

	Three Months Ended March 31,
	2012		2011
Depreciation, depletion and amortization:
Minerals and materials	$	4.6	$	4.5
Environmental		1.4		1.3
Oilfield services		4.0		3.0
Transportation		—		—
Corporate		0.6		0.6
Total	$	10.6	$	9.4
Capital expenditures:
Minerals and materials	$	6.5	$	2.8
Environmental		2.6		0.7
Oilfield services		6.0		6.4
Transportation		—		—
Corporate		1.5		0.5
Total	$	16.6	$	10.4
Research and development (income) expense:
Minerals and materials	$	1.7	$	1.6
Environmental		0.6		0.5
Oilfield services		0.1		—
Corporate		0.1		(0.2	)
Total	$	2.5	$	1.9