Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Data (unaudited) [Abstract]

Quarterly Financial Data

	2015 quarters
	First		Second		Third		Fourth
	(millions of dollars, except per share amounts)
Net sales by segment
Specialty Minerals segment	$	154.0	$	156.5	$	156.5	$	157.6
Refractories segment		73.9		76.4		77.4	$	68.2
Performance Materials segment		127.9		129.1		126.5	$	131.3
Construction Technologies segment		38.9		52.1		49.7	$	39.4
Energy Services segment		58.6		49.3		40.9	$	33.4
Net sales		453.3		463.4		451.0		429.9
Gross profit		116.6		126.2		118.9		109.3
Income from operations		59.9		52.8		49.9		37.7
Income from continuing operations		36.0		27.5		30.3		17.8
Net income attributable to MTI		35.1		26.6		29.2		17.0
Basic earnings per share attributable to MTI shareholders:
Income from continuing operations	$	1.01	$	0.77	$	0.84	$	0.49
Loss from discontinued operations		-		-		-		-
Net income	$	1.01	$	0.77	$	0.84	$	0.49
Diluted earnings per share attributable to MTI shareholders:
Income from continuing operations	$	1.01	$	0.76	$	0.83	$	0.48
Loss from discontinued operations		-		-		-		-
Net income	$	1.01	$	0.76	$	0.83	$	0.48
Market price range per share of common stock:
High	$	74.74	$	74.21	$	68.15	$	61.80
Low	$	59.00	$	66.49	$	46.69	$	45.35
Close	$	70.65	$	69.02	$	50.31	$	45.86
Dividends paid per common share	$	0.05	$	0.05	$	0.05	$	0.05

	2014 quarters
	First		Second		Third		Fourth
	(millions of dollars, except per share amounts)
Net sales by segment
Specialty Minerals segment	$	159.7	$	167.8	$	163.0	$	159.6
Refractories segment		84.7		91.7		90.4		92.9
Performance Materials segment		-		75.8		135.6		141.4
Construction Technologies segment		-		37.2		69.1		46.0
Energy Services segment		-		48.6		85.4		76.1
Net sales		244.4		421.1		543.5		516.0
Gross profit		55.3		102.7		145.0		132.4
Income from operations		23.6		35.8		66.8		42.6
Income from continuing operations		16.3		17.6		37.6		21.9
Income (loss) from discontinued operations		-		1.8		0.2		0.1
Net income attributable to MTI		15.6		18.5		37.0		21.3
Basic earnings per share attributable to MTI shareholders:
Income from continuing operations	$	0.45	$	0.48	$	1.07	$	0.61
Loss from discontinued operations		-		0.05		-		0.01
Net income	$	0.45	$	0.53	$	1.07	$	0.62
Diluted earnings per share attributable to MTI shareholders:
Income from continuing operations	$	0.45	$	0.48	$	1.06	$	0.61
Loss from discontinued operations		-		0.05		-		-
Net income	$	0.45	$	0.53	$	1.06	$	0.61
Market price range per share of common stock:
High	$	64.48	$	66.50	$	67.02	$	77.40
Low	$	48.81	$	59.49	$	57.14	$	58.06
Close	$	63.57	$	65.01	$	63.45	$	69.45
Dividends paid per common share	$	0.05	$	0.05	$	0.05	$	0.05