CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Product sales	$ 410.1	$ 458.1	$ 1,218.8	$ 1,075.0
Service revenue	40.9	85.4	148.8	134.0
Total net sales	451.0	543.5	1,367.6	1,209.0
Cost of goods sold	302.4	337.8	895.8	812.0
Cost of service revenue	29.7	60.7	110.2	94.0
Total cost of sales	332.1	398.5	1,006.0	906.0
Production margin	118.9	145.0	361.6	303.0
Marketing and administrative expenses	47.9	59.7	139.6	127.4
Research and development expenses	6.2	6.6	17.8	18.0
Amortization expense of intangible assets acquired	2.0	1.9	5.8	2.9
Acquisition related transaction and integration costs	2.4	4.2	8.5	16.7
Restructuring and other charges	10.5	5.8	27.3	11.8
Income from operations	49.9	66.8	162.6	126.2
Interest expense, net	(14.5)	(16.0)	(45.5)	(25.2)
Extinguishment of debt costs and fees	0.0	0.0	(4.5)	(5.8)
Other non-operating income (deductions), net	2.8	0.9	5.7	0.5
Total non-operating deductions, net	(11.7)	(15.1)	(44.3)	(30.5)
Income from continuing operations before provision for taxes and equity in earnings	38.2	51.7	118.3	95.7
Provision for taxes on income	8.4	14.4	25.8	24.8
Equity in earnings of affiliates, net of tax	0.5	0.3	1.4	0.6
Income from continuing operations, net of tax	30.3	37.6	93.9	71.5
Income from discontinued operations, net of tax	0.0	0.2	0.0	2.0
Consolidated net income	30.3	37.8	93.9	73.5
Less: Net income attributable to non-controlling interests	1.1	0.8	2.9	2.4
Net income attributable to Minerals Technologies Inc. (MTI)	$ 29.2	$ 37.0	$ 91.0	$ 71.1
Basic:
Income from continuing operations attributable to MTI (in dollars per share)	$ 0.84	$ 1.07	$ 2.62	$ 2.00
Income from discontinued operations attributable to MTI (in dollars per share)	0	0	0	0.06
Basic earnings per share attributable to MTI (in dollars per share)	0.84	1.07	2.62	2.06
Diluted:
Income from continuing operations attributable to MTI (in dollars per share)	0.83	1.06	2.60	1.99
Income from discontinued operations attributable to MTI (in dollars per share)	0	0	0	0.06
Diluted earnings per share attributable to MTI (in dollars per share)	0.83	1.06	2.60	2.05
Cash dividends declared per common share (in dollars per share)	$ 0.05	$ 0.05	$ 0.15	$ 0.15
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	34.8