CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Product sales	$ 414.1	$ 372.5	$ 808.8	$ 616.9
Service revenue	49.3	48.6	107.9	48.6
Total net sales	463.4	421.1	916.7	665.5
Cost of goods sold	300.6	285.1	593.5	474.2
Cost of service revenue	36.6	33.3	80.4	33.3
Total cost of sales	337.2	318.4	673.9	507.5
Production margin	126.2	102.7	242.8	158.0
Marketing and administrative expenses	46.2	46.3	91.7	67.8
Research and development expenses	5.8	6.3	11.7	11.4
Amortization expense of intangible assets acquired	1.9	1.0	3.8	1.0
Acquisition related transaction and integration costs	2.7	7.3	6.1	12.4
Restructuring and other charges	16.8	6.0	16.8	6.0
Income from operations	52.8	35.8	112.7	59.4
Interest expense, net	(15.8)	(8.9)	(31.2)	(9.1)
Extinguishment of debt costs and fees	(4.5)	(5.8)	(4.5)	(5.8)
Other non-operating income (deductions), net	(0.2)	(0.3)	3.0	(0.4)
Total non-operating deductions, net	(20.5)	(15.0)	(32.7)	(15.3)
Income from continuing operations before provision for taxes and equity in earnings	32.3	20.8	80.0	44.1
Provision for taxes on income	5.3	3.4	17.4	10.5
Equity in earnings of affiliates, net of tax	0.5	0.2	0.9	0.2
Income from continuing operations, net of tax	27.5	17.6	63.5	33.8
Income (loss) from discontinued operations, net of tax	0.0	1.8	0.0	1.8
Consolidated net income	27.5	19.4	63.5	35.6
Less: Net income attributable to non-controlling interests	0.9	0.9	1.8	1.5
Net income attributable to Minerals Technologies Inc. (MTI)	$ 26.6	$ 18.5	$ 61.7	$ 34.1
Basic:
Income from continuing operations attributable to MTI (in dollars per share)	$ 0.77	$ 0.48	$ 1.78	$ 0.94
Income (loss) from discontinued operations attributable to MTI (in dollars per share)	0	0.05	0	0.05
Basic earnings per share attributable to MTI (in dollars per share)	0.77	0.53	1.78	0.99
Diluted:
Income from continuing operations attributable to MTI (in dollars per share)	0.76	0.48	1.76	0.93
Income (loss) from discontinued operations attributable to MTI (in dollars per share)	0	0.05	0	0.05
Diluted earnings per share attributable to MTI (in dollars per share)	0.76	0.53	1.76	0.98
Cash dividends declared per common share (in dollars per share)	$ 0.05	$ 0.05	$ 0.10	$ 0.10
Shares used in computation of earnings per share:
Basic (in shares)	34.7	34.5	34.7	34.5
Diluted (in shares)	35.0	34.8	35.0	34.7