CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Product sales	$ 386.3	$ 384.4
Service revenue	18.7	25.8
Total net sales	405.0	410.2
Cost of goods sold	279.0	277.6
Cost of service revenue	12.3	19.9
Total cost of sales	291.3	297.5
Production margin	113.7	112.7
Marketing and administrative expenses	44.4	46.7
Research and development expenses	5.8	5.9
Acquisition related transaction and integration costs	1.5	1.6
Restructuring charges	0.3	0.9
Income from operations	61.7	57.6
Interest expense, net	(11.8)	(14.1)
Debt modification costs and fees	(3.9)	0.0
Other non-operating income (deductions), net	(0.5)	1.7
Total non-operating deductions, net	(16.2)	(12.4)
Income before provision for taxes and equity in earnings	45.5	45.2
Provision for taxes on income	10.1	10.7
Equity in earnings of affiliates, net of tax	0.2	0.3
Consolidated net income	35.6	34.8
Less: Net income attributable to non-controlling interests	1.0	0.9
Net income attributable to Minerals Technologies Inc. (MTI)	$ 34.6	$ 33.9
Earnings per share:
Basic earnings per share attributable to MTI (in dollars per share)	$ 0.99	$ 0.97
Diluted earnings per share attributable to MTI (in dollars per share)	0.97	0.97
Cash dividends declared per common share (in dollars per share)	$ 0.05	$ 0.05
Shares used in computation of earnings per share:
Basic (in shares)	35.0	34.8
Diluted (in shares)	35.6	34.9