CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Product sales	$ 458.1	$ 254.2	$ 1,075.0	$ 761.5
Service revenue	85.4	0	134.0	0
Total net sales	543.5	254.2	1,209.0	761.5
Cost of goods sold	337.8	194.3	812.0	586.9
Cost of service revenue	60.7	0	94.0	0
Total cost of sales	398.5	194.3	906.0	586.9
Production margin	145.0	59.9	303.0	174.6
Marketing and administrative expenses	59.7	21.9	127.4	66.3
Research and development expenses	6.6	5.3	18.0	14.9
Amortization expense of intangible assets acquired	1.9	0	2.9	0
Acquisition related transaction and integration costs	4.2	0	16.7	0
Restructuring and other charges	5.8	0	11.8	0
Income from operations	66.8	32.7	126.2	93.4
Interest expense, net	(16.0)	(0.1)	(25.2)	(0.5)
Premium on early extinguishment of debt	0	0	(5.8)	0
Other non-operating income (deductions), net	0.9	(1.1)	0.5	(2.1)
Total non-operating deductions, net	(15.1)	(1.2)	(30.5)	(2.6)
Income from continuing operations before provision for taxes and equity in earnings	51.7	31.5	95.7	90.8
Provision for taxes on income	14.4	8.9	24.8	25.2
Equity in earnings of affiliates, net of tax	0.3	0	0.6	0
Income from continuing operations, net of tax	37.6	22.6	71.5	65.6
Income (loss) from discontinued operations, net of tax	0.2	0	2.0	(5.7)
Consolidated net income	37.8	22.6	73.5	59.9
Less: Net income attributable to non-controlling interests	0.8	0.7	2.4	2.2
Net income attributable to Minerals Technologies Inc. (MTI)	$ 37.0	$ 21.9	$ 71.1	$ 57.7
Basic:
Income from continuing operations attributable to MTI (in dollars per share)	$ 1.07	$ 0.63	$ 2.00	$ 1.82
Income (loss) from discontinued operations attributable to MTI (in dollars per share)	$ 0	$ 0	$ 0.06	$ (0.16)
Basic earnings per share attributable to MTI (in dollars per share)	$ 1.07	$ 0.63	$ 2.06	$ 1.66
Diluted:
Income from continuing operations attributable to MTI (in dollars per share)	$ 1.06	$ 0.63	$ 1.99	$ 1.81
Income (loss) from discontinued operations attributable to MTI (in dollars per share)	$ 0	$ 0	$ 0.06	$ (0.16)
Diluted earnings per share attributable to MTI (in dollars per share)	$ 1.06	$ 0.63	$ 2.05	$ 1.65
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)	34.5	34.6	34.5	34.8
Diluted (in shares)	34.8	34.9	34.8	35.1