CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Product sales	$ 412.2	$ 386.3
Service revenue	19.1	18.7
Total net sales	431.3	405.0
Cost of goods sold	305.0	279.0
Cost of service revenue	12.8	12.3
Total cost of sales	317.8	291.3
Production margin	113.5	113.7
Marketing and administrative expenses	44.4	44.0
Research and development expenses	6.1	5.8
Acquisition related transaction and integration costs	0.4	1.5
Restructuring and other items, net	0.0	0.3
Income from operations	62.6	62.1
Interest expense, net	(10.7)	(11.8)
Debt modification costs and fees	0.0	(3.9)
Other non-operating income (deductions), net	(2.7)	(0.9)
Total non-operating deductions, net	(13.4)	(16.6)
Income before provision for taxes and equity in earnings	49.2	45.5
Provision for taxes on income	9.3	10.1
Equity in earnings of affiliates, net of tax	1.2	0.2
Consolidated net income	41.1	35.6
Less: Net income attributable to non-controlling interests	1.2	1.0
Net income attributable to Minerals Technologies Inc. (MTI)	$ 39.9	$ 34.6
Earnings per share:
Basic earnings per share attributable to MTI (in dollars per share)	$ 1.13	$ 0.99
Diluted earnings per share attributable to MTI (in dollars per share)	1.12	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)	35.4	35.0
Diluted (in shares)	35.7	35.6