Minerals (MTX) 10-Q 2 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 22, 2019
Cover [Abstract]
Entity Registrant Name	MINERALS TECHNOLOGIES INC
Entity Central Index Key	0000891014
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		35,062,611
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-11430
Entity Tax Identification Number	25-1190717
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	622 Third Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017-6707
City Area Code	212
Local Phone Number	878-1800
Title of 12(b) Security	Common Stock, $0.10 par value
Trading Symbol	MTX
Security Exchange Name	NYSE

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Statements of Income [Abstract]
Total net sales	$ 463.8	$ 464.7	$ 901.5	$ 896
Total cost of sales	351.8	348.8	679.8	666.6
Production margin	112	115.9	221.7	229.4
Marketing and administrative expenses	48.4	45.3	91.3	89.7
Research and development expenses	4.9	6.4	9.7	12.5
Acquisition related transaction and integration costs	0	1	0	1.4
Restructuring and other items, net	13.2	0.4	13.2	0.4
Income from operations	45.5	62.8	107.5	125.4
Interest expense, net	(10.9)	(11.5)	(22.3)	(22.2)
Other non-operating income (deductions), net	(2.4)	3.1	(3.8)	0.4
Total non-operating deductions, net	(13.3)	(8.4)	(26.1)	(21.8)
Income from operations before tax and equity in earnings	32.2	54.4	81.4	103.6
Provision for taxes on income	5.1	10.3	14.4	19.6
Equity in earnings of affiliates, net of tax	0.5	1.1	0.6	2.3
Consolidated net income	27.6	45.2	67.6	86.3
Less: Net income attributable to non-controlling interests	1	1.1	1.9	2.3
Net income attributable to Minerals Technologies Inc.	$ 26.6	$ 44.1	$ 65.7	$ 84
Basic:
Income from operations attributable to Minerals Technologies Inc. (in dollars per share)	$ 0.76	$ 1.25	$ 1.87	$ 2.37
Diluted:
Income from operations attributable to Minerals Technologies Inc. (in dollars per share)	0.75	1.24	1.86	2.36
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)	35.2	35.3	35.2	35.4
Diluted (in shares)	35.3	35.6	35.3	35.6
Product [Member]
Statements of Income [Abstract]
Total net sales	$ 438	$ 445	$ 855.4	$ 857.2
Total cost of sales	334	335.3	648	640.3
Service [Member]
Statements of Income [Abstract]
Total net sales	25.8	19.7	46.1	38.8
Total cost of sales	$ 17.8	$ 13.5	$ 31.8	$ 26.3

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Consolidated net income	$ 27.6	$ 45.2	$ 67.6	$ 86.3
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(18.7)	(54.5)	(19.1)	(39.1)
Pension and postretirement plan adjustments	1.7	1.9	3.3	3.7
Unrealized gains (losses) on derivative instruments	(3.3)	(1.3)	(2.1)	0.3
Total other comprehensive loss, net of tax	(20.3)	(53.9)	(17.9)	(35.1)
Total comprehensive income (loss) including non-controlling interests	7.3	(8.7)	49.7	51.2
Comprehensive income (loss) attributable to non-controlling interests	(0.8)	0.5	(2.2)	(1.3)
Comprehensive income (loss) attributable to Minerals Technologies Inc.	$ 6.5	$ (8.2)	$ 47.5	$ 49.9

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Jun. 30, 2019	[1]	Dec. 31, 2018	[2]
Current assets:
Cash and cash equivalents	$ 214.5		$ 208.8
Short-term investments	5.2		3.8
Accounts receivable, net	411.9		387.3
Inventories	258.4		239.2
Prepaid expenses and other current assets	41.1		37.2
Total current assets	931.1		876.3
Property, plant and equipment	2,246.8		2,256
Less accumulated depreciation and depletion	(1,177.7)		(1,153.1)
Property, plant and equipment, net	1,069.1		1,102.9
Goodwill	807.9		812.4
Intangible assets	207.9		214.1
Deferred income taxes	25.4		26.3
Other assets and deferred charges	108		55.1
Total assets	3,149.4		3,087.1
Current liabilities:
Short-term debt	104.2		105.2
Current maturities of long-term debt	2.1		3.3
Accounts payable	188.2		169.1
Other current liabilities	111.1		104.3
Total current liabilities	405.6		381.9
Long-term debt, net of unamortized discount and deferred financing costs	874.2		907.8
Deferred income taxes	194.2		196.8
Accrued pension and post-retirement benefits	123		124.2
Other non-current liabilities	130.8		91.1
Total liabilities	1,727.8		1,701.8
Shareholders' equity:
Common stock	4.9		4.9
Additional paid-in capital	435.3		431.9
Retained earnings	1,842.2		1,769.1
Accumulated other comprehensive loss	(262.8)		(233.7)
Less common stock held in treasury	(628.7)		(618.7)
Total Minerals Technologies Inc. shareholders' equity	1,390.9		1,353.5
Non-controlling interests	30.7		31.8
Total shareholders' equity	1,421.6		1,385.3
Total liabilities and shareholders' equity	$ 3,149.4		$ 3,087.1
[1]	Unaudited
[2]	Condensed from audited financial statements

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019		Jul. 01, 2018
Operating Activities:
Consolidated net income	$ 67.6		$ 86.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	48.9		44.5
Amortization of right of use asset	6.6		0
Asset impairment charges	7.5		0
Other non-cash items	4.5		(2)
Pension plan funding	(3.1)		(12.3)
Net changes in operating assets and liabilities	(33.7)		(36.3)
Net cash provided by operating activities	98.3		80.2
Investing Activities:
Purchases of property, plant and equipment, net	(35.5)		(42.1)
Acquisition of business, net of cash acquired	0		(124.1)
Proceeds from sale of short-term investments	3.4		1.8
Purchases of short-term investments	(4.7)		(2.5)
Other investing activities	(0.8)		0
Net cash used in investing activities	(37.6)		(166.9)
Financing Activities:
Debt issuance costs	0		(1.4)
Repayment of long-term debt	(36.6)		(6.6)
Proceeds from issuance of short-term debt	0		113
Repayment of short-term debt	(1.1)		(1.1)
Purchase of common stock for treasury	(10)		(13.3)
Proceeds from issuance of stock under option plan	0.4		1.9
Excess tax benefits related to stock incentive programs	(1.9)		(3.2)
Dividends paid to non-controlling interests	(3.9)		(0.2)
Capital contribution from non-controlling interests	0.6		0
Cash dividends paid	(3.5)		(3.5)
Net cash used in financing activities	(56)		85.6
Effect of exchange rate changes on cash and cash equivalents	1		(8.1)
Net increase (decrease) in cash and cash equivalents	5.7		(9.2)
Cash and cash equivalents at beginning of period	208.8	[1]	212.2
Cash and cash equivalents at end of period	214.5	[2]	203
Supplemental disclosure of cash flow information:
Interest paid	21.9		22.1
Income taxes paid	13.7		20.9
Non-cash financing activities:
Treasury stock purchases settled after period end	$ 0		$ 0.3
[1]	Condensed from audited financial statements
[2]	Unaudited

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Non-controlling Interests [Member]	Total
Balance at Dec. 31, 2017	$ 4.9	$ 422.7	$ 1,607.2	$ (186.1)	$ (597)	$ 27.4	$ 1,279.1
Net income	0	0	39.9	0	0	1.2	41.1
Other comprehensive income (loss)	0	0	0	18.2	0	0.5	18.7
Dividends declared	0	0	(1.8)	0	0	0	(1.8)
Dividends paid to non-controlling interests	0	0	0	0	0	(0.1)	(0.1)
Issuance of shares pursuant to employee stock compensation plans	0	0.5	0	0	0	0	0.5
Purchase of common stock for treasury	0	0	0	0	(5.7)	0	(5.7)
Balance at Apr. 01, 2018	4.9	423.2	1,645.3	(167.9)	(602.7)	29	1,331.8
Balance at Dec. 31, 2017	4.9	422.7	1,607.2	(186.1)	(597)	27.4	1,279.1
Net income							86.3
Other comprehensive income (loss)							(35.1)
Balance at Jul. 01, 2018	4.9	426.9	1,687.7	(220.2)	(610.4)	28.5	1,317.4
Balance at Apr. 01, 2018	4.9	423.2	1,645.3	(167.9)	(602.7)	29	1,331.8
Net income	0	0	44.1	0	0	1.1	45.2
Other comprehensive income (loss)	0	0	0	(52.3)	0	(1.6)	(53.9)
Dividends declared	0	0	(1.7)	0	0	0	(1.7)
Dividends paid to non-controlling interests	0	0	0	0	0	0	0
Issuance of shares pursuant to employee stock compensation plans	0	1.4	0	0	0	0	1.4
Stock-based compensation	0	2.3	0	0	0	0	2.3
Purchase of common stock for treasury	0	0	0	0	(7.7)	0	(7.7)
Balance at Jul. 01, 2018	4.9	426.9	1,687.7	(220.2)	(610.4)	28.5	1,317.4
Cumulative effect of accounting change | ASU 2018-02 [Member]	0	0	10.9	(10.9)	0	0	0
Balance at Dec. 31, 2018	4.9	431.9	1,769.1	(233.7)	(618.7)	31.8	1,385.3	[1]
Net income	0	0	39.1	0	0	0.9	40
Other comprehensive income (loss)	0	0	0	1.9	0	0.5	2.4
Dividends declared	0	0	(1.7)	0	0	0	(1.7)
Dividends paid to non-controlling interests	0	0	0	0	0	(0.1)	(0.1)
Capital contribution from non-controlling interests	0	0	0	0	0	0.8	0.8
Issuance of shares pursuant to employee stock compensation plans	0	0.1	0	0	0	0	0.1
Stock-based compensation	0	0.6	0	0	0	0	0.6
Balance at Mar. 31, 2019	4.9	432.6	1,817.4	(242.7)	(618.7)	33.9	1,427.4
Balance at Dec. 31, 2018	4.9	431.9	1,769.1	(233.7)	(618.7)	31.8	1,385.3	[1]
Net income							67.6
Other comprehensive income (loss)				(18.2)			(17.9)
Balance at Jun. 30, 2019	4.9	435.3	1,842.2	(262.8)	(628.7)	30.7	1,421.6	[2]
Balance at Mar. 31, 2019	4.9	432.6	1,817.4	(242.7)	(618.7)	33.9	1,427.4
Net income	0	0	26.6	0	0	1	27.6
Other comprehensive income (loss)	0	0	0	(20.1)	0	(0.2)	(20.3)
Dividends declared	0	0	(1.8)	0	0	0	(1.8)
Dividends paid to non-controlling interests	0	0	0	0	0	(3.8)	(3.8)
Capital distribution to non-controlling interests	0	0	0	0	0	(0.2)	(0.2)
Issuance of shares pursuant to employee stock compensation plans	0	0.2	0	0	0	0	0.2
Stock-based compensation	0	2.5	0	0	0	0	2.5
Purchase of common stock for treasury	0	0	0	0	(10)	0	(10)
Balance at Jun. 30, 2019	$ 4.9	$ 435.3	1,842.2	(262.8)	$ (628.7)	$ 30.7	$ 1,421.6	[2]
Cumulative effect of accounting change | ASU 2018-02 [Member]			$ 10.9	$ (10.9)
[1]	Condensed from audited financial statements
[2]	Unaudited

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Basis of Presentation and Summary of Significant Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Note 1. Basis of Presentation and Summary of Significant Accounting Policies The accompanying unaudited condensed consolidated financial statements have been prepared by management of Minerals Technologies Inc. (the “Company”, “MTI”, “we”, or “us”) in accordance with the rules and regulations of the United States Securities and Exchange Commission. Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles have been condensed or omitted. Therefore, these financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2018. In the opinion of management, all adjustments, consisting solely of normal recurring adjustments necessary for a fair presentation of the financial information for the periods indicated, have been included. The results for the three-month and six-month periods ended June 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. Company Operations The Company is a resource- and technology-based company that develops, produces and markets worldwide a broad range of specialty mineral, mineral-based and synthetic mineral products and supporting systems and services. The Company has four reportable segments: Performance Materials, Specialty Minerals, Refractories and Energy Services. – The Performance Materials segment is a leading global supplier of bentonite and bentonite-related products, chromite and leonardite. This segment also provides products for non-residential construction, environmental and infrastructure projects worldwide, serving customers engaged in a broad range of construction projects. – The Specialty Minerals segment produces and sells the synthetic mineral product precipitated calcium carbonate (“PCC”) and processed mineral product quicklime (“lime”), and mines mineral ores then processes and sells natural mineral products, primarily limestone and talc. – The Refractories segment produces and markets monolithic and shaped refractory materials and specialty products, services and application and measurement equipment, and calcium metal and metallurgical wire products. – The Energy Services segment provides services to improve the production, costs, compliance, and environmental impact of activities performed in the oil and gas industry. This segment offers a range of patented and unpatented technologies, products and services to the upstream and downstream oil and gas sector throughout the world. Use of Estimates The Company employs accounting policies that are in accordance with U.S. generally accepted accounting principles and require management to make estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reported period. Significant estimates include those related to revenue recognition, valuation of long-lived assets, goodwill and other intangible assets, income taxes, including valuation allowances, and pension plan assumptions. Actual results could differ from those estimates. Recently Issued Accounting Standards Changes to accounting principles generally accepted in the United States of America (U.S. GAAP) are established by the Financial Accounting Standards Board (FASB) in the form of accounting standards updates (ASUs) to the FASB’s Accounting Standards Codification. The Company considers the applicability and impact of all ASUs. All recently issued ASUs were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial position and results of operations. Recently Adopted Accounting Standards On January 1, 2019, the Company adopted the provisions of ASU 2016-02, “Leases”, which requires lessees to recognize most leases on-balance sheet. The Company has adopted this new standard under the modified retrospective transition method, using the effective date as our date of initial application. As such, financial information and required disclosures will not be provided for dates prior to January 1, 2019. The new standard provides a number of optional practical expedients in transition. We have elected the ‘package of practical expedients’, which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification and initial direct costs. The new standard also provides practical expedients for an entity’s ongoing accounting. We have elected the short-term lease recognition exemption for all leases that qualify. On adoption, we recognized additional operating liabilities of $ million with corresponding right-of-use assets of $ million based on the present value of the remaining lease payments under existing operating leases. As of December 31, 2018, we had $ million in deferred charges related to some of our real estate leases that were recorded against the right of use asset as part of the transition. The adoption of this standard did not have a material impact on the Company's financial statements. On January 1, 2019, the Company adopted the provisions of ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the U.S. Tax Cuts and Jobs Act. As a result, the Company reclassified $10.9 million from "Accumulated other comprehensive loss" to "Retained earnings" on the Condensed Consolidated Balance Sheets as of June 30, 2019.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Note 2. Leases We determine if an arrangement is a lease at inception. The Company has operating leases for premises, equipment, rail cars and automobiles. Our leases have remaining lease terms of 1 year to 50 years, some of which may include options to extend the leases further. The Company considers these options in determining the lease term used to establish the right-of-use assets and lease liabilities. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based upon the information available at commencement date, or as of implementation of ASC 842, in determining the present value of lease payments. Leases with an initial term of 12 months or less are not recorded on the balance sheet. We recognize lease expense for these leases on a straight-line basis over the lease term. Certain lease agreements contain both lease and non-lease components. We account for lease components together with non-lease components. Operating lease cost was $4.0 million and $8.1 million for the three and six-month periods ended June 30, 2019, respectively. The components of lease costs are as follows: (millions of dollars) Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Operating lease cost $ 3.9 $ 7.9 Short-term lease cost 0.1 0.2 Total $ 4.0 $ 8.1 Supplemental cash flow information and non-cash activity related to our operating leases are as follows: (millions of dollars) June 30, 2019 Operating cash flows information: Cash paid for amounts included in the measurement of lease liabilities $ 8.3 Non-cash activity: Right-of-use assets obtained in the exchange for operating lease liabilities $ 3.3 Weighted average remaining lease term, and weighted average discount rates related to the Company’s operating leases were as follows: Weighted-average remaining operating lease term (in years) 7.80 Weighted-average operating leases discount rate 5.0 % The following table summarizes the Company's outstanding lease assets and liabilities and their classification on the Condensed Consolidated Balance Sheet: (millions of dollars) Balance Sheet Classification June 30, 2019 Right-of-use asset Other assets and deferred charges $ 47.1 Lease liability - current Other current liabilities 12.0 Lease liability - non-current Other non-current liabilities 46.1 Future minimum lease payments under the Company's operating leases as of June 30, 2019 were as follows: (millions of dollars) June 30, 2019 For the remainder of 2019 $ 7.7 2020 13.0 2021 9.6 2022 7.7 2023 6.2 Thereafter 26.3 Total future minimum lease payments 70.5 Less imputed interest (12.6 ) Total $ 57.9 As of December 31, 2018, minimum lease payments under non-cancellable operating leases were expected to be as follows: (millions of dollars) Dec. 31, 2018 2019 $ 17.3 2020 13.0 2021 9.5 2022 8.2 2023 7.0 Thereafter 24.8 Total $ 79.8 A summary of rent expense for the fiscal years ended December 31, 2018 and December 31, 2017 was as follows: (millions of dollars) Dec. 31, 2018 Dec. 31, 2017 Rent expense $ 19.5 $ 19.3 The Company has certain arrangements under which we are the lessor. Lease income associated with these leases is not material.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2019
Revenue from Contracts with Customers [Abstract]
Revenue from Contracts with Customers	Note 3. Revenue from Contracts with Customers The following table disaggregates our revenue by major source (product line) for the three and six -month periods ended June 30, 2019 and July 1, 2018 : (millions of dollars) Three Months Ended Six Months Ended Net Sales June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Metalcasting $ 75.8 $ 88.8 $ 149.0 $ 168.0 Household, Personal Care and Specialty Products 69.0 58.6 143.9 107.3 Environmental Products 29.0 25.2 44.9 37.9 Building Materials 19.1 18.0 34.4 36.9 Basic Minerals 22.5 23.9 42.4 51.7 Performance Materials 215.4 214.5 414.6 401.8 Paper PCC 90.2 94.5 181.7 191.5 Specialty PCC 17.3 17.3 35.4 34.3 Ground Calcium Carbonate 24.8 25.2 47.1 47.7 Talc 12.8 13.9 25.3 27.0 Specialty Minerals 145.1 150.9 289.5 300.5 Refractory Products 61.0 66.7 123.0 129.0 Metallurgical Products 16.5 12.9 28.3 25.9 Refractories 77.5 79.6 151.3 154.9 Energy Services 25.8 19.7 46.1 38.8 Total $ 463.8 $ 464.7 $ 901.5 $ 896.0

Business Combination

Business Combination	6 Months Ended
	Jun. 30, 2019
Business Combination [Abstract]
Business Combination	Note 4. Business Combination On April 30, 2018, the Company completed the acquisition of Sivomatic Holding B.V. (“Sivomatic”), a leading European supplier of premium pet litter products. Sivomatic is a vertically integrated manufacturer, with production facilities in the Netherlands, Austria and Turkey. With a leading position in premier clumping products, Sivomatic’s product portfolio spans the range of pet litter derived from bentonite, sourced predominantly from wholly-owned mines in Turkey. The results of Sivomatic are included in our Performance Materials segment. The acquisition was financed through a combination of cash on hand and borrowings under the Company’s credit facilities. The fair value of the total consideration transferred, net of cash acquired, was $122.5 million. The acquisition has been accounted for using the acquisition method of accounting, which requires, among other things, that we recognize the assets acquired and liabilities assumed at their respective fair values as of the acquisition date. As of April 30, 2019 , the purchase price allocation has been finalized. The following table summarizes the Company’s final amounts recognized for assets acquired and liabilities assumed for the Sivomatic acquisition as compared with the allocation previously reported on the Company's Form 10-K for the year ended December 31, 2018: (millions of dollars) Preliminary Allocation Previously Reported on Form 10-K as of December 31, 2018 Increase/ (Decrease) Final Allocation Accounts receivable $ 24.4 $ — $ 24.4 Inventories 15.6 — 15.6 Other current assets 0.6 — 0.6 Mineral rights 39.7 — 39.7 Property, plant and equipment 28.3 — 28.3 Goodwill 35.0 — 35.0 Intangible assets 26.4 — 26.4 Total assets acquired 170.0 — 170.0 Current maturity of long-term debt 5.7 — 5.7 Accounts payable 9.0 — 9.0 Accrued expenses 5.6 — 5.6 Long-term debt 5.3 — 5.3 Non-current deferred tax liability 19.7 — 19.7 Other non-current liabilities 2.2 — 2.2 Total liabilities assumed 47.5 — 47.5 Net assets acquired $ 122.5 $ — $ 122.5 The Company used the income, market, or cost approach (or a combination thereof) for the valuation, and used valuation inputs and analyses that were based on market participant assumptions. Market participants are considered to be buyers and sellers unrelated to the Company in the principal or most advantageous market for the asset or liability. For certain items, the carrying value was determined to be a reasonable approximation of fair value based on the information available. Goodwill was calculated as the excess of the consideration transferred over the assets acquired and represents the estimated future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. The allocation was completed during the second quarter of 2019. Goodwill recognized as a result of this acquisition is not deductible for tax purposes. In connection with the acquisition, the Company recorded an additional deferred tax liability of $18.8 million with a corresponding increase to goodwill. The increase in the deferred tax liability represents the tax effect of the difference between the estimated assigned fair value of the tangible and intangible assets and the tax basis of such assets. Mineral rights were valued using discounted cash flow method. Property, plant and equipment were valued using the cost method adjusted for age and deterioration. Intangible assets acquired mainly include tradenames and customer relationships. Both tradenames and customer relationships have an estimated useful life of approximately 20 years. The Company did not present pro forma and other financial information for the Sivomatic acquisition, as this is not considered to be a material business combination.

Earnings per Share (EPS)

Earnings per Share (EPS)	6 Months Ended
	Jun. 30, 2019
Earnings per Share (EPS) [Abstract]
Earnings per Share (EPS)	Note 5. Earnings per Share (EPS) Basic earnings per share are based upon the weighted average number of common shares outstanding during the period. Diluted earnings per share are based upon the weighted average number of common shares outstanding during the period assuming the issuance of common shares for all potentially dilutive common shares outstanding. The following table sets forth the computation of basic and diluted earnings per share: Three Months Ended Six Months Ended (in millions, except per share data) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Net income attributable to Minerals Technologies Inc. $ 26.6 $ 44.1 $ 65.7 $ 84.0 Weighted average shares outstanding 35.2 35.3 35.2 35.4 Dilutive effect of stock options and stock units 0.1 0.3 0.1 0.2 Weighted average shares outstanding, adjusted 35.3 35.6 35.3 35.6 Basic earnings per share attributable to Minerals Technologies Inc. $ 0.76 $ 1.25 $ 1.87 $ 2.37 Diluted earnings per share attributable to Minerals Technologies Inc. $ 0.75 $ 1.24 $ 1.86 $ 2.36 Options to purchase 470,304 shares and 357,771 shares of common stock for the three-month and six-month periods ended June 30, 2019 and July 1, 2018, respectively, were not included in the computation of diluted earnings per share because they were anti-dilutive, as the exercise prices of the options were greater than the average market price of the common shares.

Restructuring and Other Items,

Restructuring and Other Items, net	6 Months Ended
	Jun. 30, 2019
Restructuring and Other Items, net [Abstract]
Restructuring and Other Items, net	Note 6. Restructuring and Other Items, net During the second quarter of 2019, the Company initiated a restructuring and cost savings program to better align our costs and organizational structure with the current market environment. The Company recorded a $7.5 million non-cash impairment of assets charge related to facilities no longer operating and underutilization of certain equipment, and $5.7 million in other restructuring costs in the second quarter of 2019. The Company expects to realize annualized savings from this restructuring program of approximately $12 million by the first half of 2020. The following table outlines the amount of restructuring charges recorded within the Consolidated Statements of Income and the segments they relate to for the three months ended June 30, 2019 : (millions of dollars) June 30, 2019 Impairment of assets Performance Materials $ 4.2 Specialty Minerals 1.6 Energy Services 1.7 Total impairment of assets charges $ 7.5 Severance and other related costs Performance Materials $ 2.8 Specialty Minerals 0.9 Refractories 0.8 Energy Services 0.1 Corporate 1.1 Total severance and other related costs $ 5.7 Total restructuring and other items, net $ 13.2 At June 30, 2019, the Company had $7.1 million included within accrued liabilities in the Condensed Consolidated Balance Sheet for cash expenditures needed to satisfy remaining obligations under workforce reduction initiatives. The Company expects to pay these amounts by the first half of 2020. The following table is a reconciliation of our restructuring liability balance as of June 30, 2019 : (millions of dollars) Restructuring liability, December 31, 2018 $ 2.5 Additional provisions 5.7 Cash payments (1.1 ) Restructuring liability, June 30, 2019 $ 7.1

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Taxes [Abstract]
Income Taxes	Note 7. Income Taxes Provision for taxes was $5.1 million and $14.4 million during the three and six-month periods ended June 30, 2019, respectively. The effective tax rate was 15.8% as compared with 18.9% in the prior year. The lower effective tax rate was primarily due to discrete items related to restructuring charges and the expiration of the tax statute of limitations due to the completion of a tax audit. As of June 30, 2019, the Company had approximately $15.5 million of total unrecognized income tax benefits. Included in this amount were a total of $11.9 million of unrecognized income tax benefits that, if recognized, would affect the Company’s effective tax rate. While it is expected that the amount of unrecognized tax benefits will change in the next 12 months, the Company does not expect the change to have a significant impact on the results of operations or the financial position of the Company. The Company’s accounting policy is to recognize interest and penalties accrued relating to unrecognized income tax benefits as part of its provision for income taxes. The Company had net decreases of approximately $0.1 million and $0.2 million during the three and six-months ended June 30, 2019, respectively, and had an accrued balance of $2.8 million of interest and penalties as of June 30, 2019. The Company operates in multiple taxing jurisdictions, both within and outside the U.S. In certain situations, a taxing authority may challenge positions that the Company has adopted in its income tax filings. The Company, with a few exceptions (none of which are material), is no longer subject to income tax examinations by tax authorities for years prior to 2010.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2019
Inventories [Abstract]
Inventories	Note 8. Inventories The following is a summary of inventories by major category: (millions of dollars) June 30, 2019 Dec. 31, 2018 Raw materials $ 102.8 $ 93.4 Work-in-process 10.0 11.2 Finished goods 98.7 92.2 Packaging and supplies 46.9 42.4 Total inventories $ 258.4 $ 239.2

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2019
Goodwill and Other Intangible Assets [Abstract]
Goodwill and Other Intangible Assets	Note 9. Goodwill and Other Intangible Assets Goodwill and other intangible assets with indefinite lives are not amortized, but instead are assessed for impairment, at least annually. The carrying amount of goodwill was $807.9 and $812.4 million as of June 30, 2019 and December 31, 2018, respectively. The change in goodwill from December 31, 2018 to June 30, 2019 is attributable to the effects of foreign exchange. Intangible assets subject to amortization as of June 30, 2019 and December 31, 2018 were as follows: June 30, 2019 Dec. 31, 2018 (millions of dollars) Weighted Average Useful Life (Years) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Tradenames 35 $ 203.9 $ 29.5 $ 204.2 $ 26.6 Technology 13 18.8 7.2 18.8 6.4 Patents 19 6.4 5.8 6.4 5.6 Customer relationships 22 25.1 3.8 26.5 3.2 32 $ 254.2 $ 46.3 $ 255.9 $ 41.8 The weighted average amortization period for acquired intangible assets subject to amortization is approximately 32 years. Estimated amortization expense is $4.8 million for the remainder of 2019, $36.7 million for 2020–2023 and $166.4 million thereafter.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2019
Derivative Financial Instruments [Abstract]
Derivative Financial Instruments	Note 10. Derivative Financial Instruments As a multinational corporation with operations throughout the world, the Company is exposed to certain market risks. The Company uses a variety of practices to manage these market risks, including, when considered appropriate, derivative financial instruments. The Company's objective is to offset gains and losses resulting from interest rates and foreign currency exposures with gains and losses on the derivative contracts used to hedge them. The Company uses derivative financial instruments only for risk management and not for trading or speculative purposes. By using derivative financial instruments to hedge exposures to changes in interest rates and foreign currencies, the Company exposes itself to credit risk and market risk. Credit risk is the risk that the counterparty will fail to perform under the terms of the derivative contract. When the fair value of a derivative contract is positive, the counterparty owes the Company, which creates credit risk for the Company. When the fair value of a derivative contract is negative, the Company owes the counterparty, and therefore, it does not face any credit risk. The Company minimizes the credit risk in derivative instruments by entering into transactions with major financial institutions. Market risk is the adverse effect on the value of a financial instrument that results from a change in interest rates, currency exchange rates, or commodity prices. The market risk associated with interest rate and forward exchange contracts is managed by establishing and monitoring parameters that limit the types and degree of market risk that may be undertaken. Cash Flow Hedges For derivative instruments that are designated and qualify as cash flow hedges, the Company records the effective portion of the gain or loss in accumulated other comprehensive income (loss) as a separate component of shareholders' equity. The Company subsequently reclassifies the effective portion of gain or loss into earnings in the period during which the hedged transaction is recognized in earnings. The Company utilizes interest rate swaps to limit exposure to market fluctuations on floating-rate debt. In the second quarter of 2018, the Company entered into a floating to fixed interest rate swap for a notional amount of $150 million. The fair value of this swap is a liability of $6.6 million at June 30, 2019 and is recorded in other non-current liabilities on the Condensed Consolidated Balance Sheet. In addition, in the second quarter of 2016, the Company entered into a floating to fixed interest rate swap with an initial aggregate notional amount of $300 million. The notional amount was $114 million at June 30, 2019. The fair value of this swap is an asset of $0.9 million at June 30, 2019 and is recorded in other assets and deferred charges on the Condensed Consolidated Balance Sheet. These interest rate swaps are designated as cash flow hedges. As a result, the gains and losses associated with these interest rate swaps are recorded in accumulated other comprehensive income (loss). Net Investment Hedges For derivative instruments that are designated and qualify as net investment hedges, the Company records the effective portion of the gain or loss in accumulated other comprehensive income (loss) as a separate component of shareholders' equity. To protect the value of our investments in our foreign operations against adverse changes in foreign currency exchange rates, the Company from time to time hedges a portion of our net investment in one or more of our foreign subsidiaries. During the second quarter of 2018, the Company entered into a cross currency rate swap with a total notional value of $ million to exchange monthly fixed-rate interest payments in U.S. dollars for monthly fixed-rate interest rate payments in Euros. This contract matures in May 2023 and requires the exchange of Euros and U.S. dollar principal payments upon maturity. Changes in the fair value of this financial instrument are recognized in to offset the change in the carrying amount of the net investment being hedged. Amounts are reclassified out of into earnings when the hedged net investment is either sold or substantially liquidated. Assets and liabilities measured at fair value are based on one or more of three valuation techniques. The three valuation techniques are as follows: ● Market approach - prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. ● Cost approach - amount that would be required to replace the service capacity of an asset or replacement cost. ● Income approach - techniques to convert future amounts to a single present amount based on market expectations, including present value techniques, option-pricing and other models. The Company primarily applies the income approach for interest rate derivatives for recurring fair value measurements and attempts to utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value of our interest rate swaps and cross currency rate swap contracts are determined based on inputs that are readily available in public markets or can be derived from information available in publicly quoted markets and are categorized as Level 2.

Long-Term Debt and Commitments

Long-Term Debt and Commitments	6 Months Ended
	Jun. 30, 2019
Long-Term Debt and Commitments [Abstract]
Long-Term Debt and Commitments	Note 11. Long-Term Debt and Commitments The following is a summary of long-term debt: ( millions of dollars) June 30, 2019 Dec. 31, 2018 Term Loan Facility-Variable Tranche due February 14, 2024, net of unamortized discount and deferred financing costs of $17.8 million and $19.4 million $ 640.3 $ 638.6 Term Loan Facility- Fixed Tranche due May 9, 2021, net of unamortized discount and deferred financing costs of $0.3 million and $0.3 million 227.7 262.6 Netherlands Term Loan due 2020 2.3 3.4 Netherlands Term Loan due 2022 1.1 1.4 Japan Loan Facilities 4.9 5.1 Total 876.3 911.1 Less: Current maturities 2.1 3.3 Total long-term debt $ 874.2 $ 907.8 On May 9, 2014, in connection with the acquisition of AMCOL International Corporation (“AMCOL”), the Company entered into a credit agreement providing for a $1.560 billion senior secured term loan facility (the “Term Facility”) and a $200 million senior secured revolving credit facility (the “Revolving Facility” and, together with the Term Facility, the “Facilities”). On June 23, 2015, the Company entered into an amendment (the “First Amendment”) to the credit agreement to reprice the $1.378 billion then outstanding on the Term Facility. As amended, the Term Facility had a $1.078 billion floating rate tranche and a $300 million fixed rate tranche. On February 14, 2017, the Company entered into an amendment (the “Second Amendment”) to the credit agreement to reprice the $788 million floating rate tranche then outstanding, which extended the maturity and lowered the interest costs by 75 basis points. On April 18, 2018, the Company entered into an amendment (the “Third Amendment”) to the credit agreement to refinance the Revolving Facility. As amended, the Revolving Facility has been increased to $300 million in aggregate commitments. Following the amendments, the loans outstanding under the floating rate tranche of the Term Facility will mature on February 14, 2024, the loans outstanding under the fixed rate tranche of the Term Facility will mature on May 9, 2021 and the loans outstanding (if any) and commitments under the Revolving Facility will mature and terminate, as the case may be, on April 18, 2023. Loans under the floating rate tranche of the Term Facility bear interest at a rate equal to an adjusted LIBOR rate (subject to a floor of 0.75%) plus an applicable margin equal to 2.25% per annum. Loans under the fixed rate tranche of the Term Facility bear interest at a rate of 4.75%. Loans under the Revolving Facility bear interest at a rate equal to an adjusted LIBOR rate plus an applicable margin equal to 1.625% per annum. Such rates are subject to decrease by up to 25 basis points in the event that, and for so long as, the Company’s net leverage ratio (as defined in the credit agreement) is less than certain thresholds. The floating rate tranche of the Term Facility was issued at par and the fixed rate tranche of the Term Facility was issued at a 0.25% discount in connection with the First Amendment. The variable rate tranche of the Term Facility was issued at a 0.25% discount in connection with the Second Amendment. The variable rate tranche has a 1% required amortization per year. The Company will pay certain fees under the credit agreement, including customary annual administration fees. The obligations of the Company under the Facilities are unconditionally guaranteed jointly and severally by, subject to certain exceptions, all material domestic subsidiaries of the Company (the “Guarantors”) and secured, subject to certain exceptions, by a security interest in substantially all of the assets of the Company and the Guarantors. During the first half of 2019, the Company repaid $35.0 million on its Term Facility. The credit agreement contains certain customary affirmative and negative covenants that limit or restrict the ability of the Company and its restricted subsidiaries to enter into certain transactions or take certain actions. In addition, the credit agreement contains a financial covenant that requires the Company, if on the last day of any fiscal quarter loans or letters of credit were outstanding under the Revolving Facility (excluding up to $15 million of letters of credit), to maintain a maximum net leverage ratio (as defined in the credit agreement) of, initially, 5.25 to 1.00 for the four fiscal quarters preceding such day. Such maximum net leverage ratio requirement is subject to decrease during the duration of the facility to a minimum level (when applicable) of 3.50 to 1.00. In connection with the Sivomatic acquisition, the Company incurred $113 million of short-term debt under the Revolving Facility. As of June 30, 2019, there were $100 million in outstanding loans and $10.4 million in letters of credit outstanding under the Revolving Facility. The Company is in compliance with all the covenants associated with the Revolving Facility as of the end of the period covered by this report. As part of the Sivomatic acquisition, the Company assumed $10.7 million in long-term debt, recorded at fair value, consisting of two term loans, one of which matures in 2020 and the other of which matures in 2022. These loans carry an interest rate of Euribor plus 2.0% and have quarterly repayments. During the first half of 2019, the Company repaid $1.3 million on these loans. The Company has a committed loan facility in Japan. As of June 30, 2019, $4.9 million was outstanding under this loan facility. Principal will be repaid in accordance with the payment schedule ending in 2021. The Company repaid $0.3 million on this facility during the first half of 2019. As of June 30, 2019, the Company had $43.5 million in uncommitted short-term bank credit lines, of which approximately $4.2 million was in use.

Benefit Plans

Benefit Plans	6 Months Ended
	Jun. 30, 2019
Benefit Plans [Abstract]
Benefit Plans	Note 12. Benefit Plans The Company and its subsidiaries have pension plans covering the majority of eligible employees on a contributory or non-contributory basis. The Company also provides postretirement health care and life insurance benefits for the majority of its U.S. retired employees. Disclosures for the U.S. plans have been combined with those outside of the U.S. as the international plans do not have significantly different assumptions, and together represent less than 25% of our total benefit obligation. Components of Net Periodic Benefit Cost Pension Benefits Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Service cost $ 1.8 $ 2.0 $ 3.6 $ 3.9 Interest cost 3.6 3.0 7.1 6.1 Expected return on plan assets (4.6 ) (4.8 ) (9.2 ) (9.6 ) Amortization: Prior service cost 0.1 0.1 0.2 0.2 Recognized net actuarial loss 2.3 2.7 4.6 5.5 Net periodic benefit cost $ 3.2 $ 3.0 $ 6.3 $ 6.1 Other Benefits Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Service cost $ 0.1 $ 0.1 $ 0.1 $ 0.1 Interest cost — — 0.1 0.1 Amortization: Prior service cost — (0.2 ) — (0.4 ) Recognized net actuarial (gain) loss (0.2 ) (0.2 ) (0.4 ) (0.4 ) Net periodic benefit cost $ (0.1 ) $ (0.3 ) $ (0.2 ) $ (0.6 ) Amortization amounts of prior service costs and recognized net actuarial losses are recorded, net of tax, as increases to accumulated other comprehensive income. The Company expects to contribute approximately $9.7 million to its pension plans and $0.3 million to its other postretirement benefit plans in 2019. As of June 30, 2019, $3.1 million has been contributed to the pension plans and less than $0.1 million has been contributed to the other postretirement benefit plans.

Comprehensive Income

Comprehensive Income	6 Months Ended
	Jun. 30, 2019
Comprehensive Income [Abstract]
Comprehensive Income	Note 13. Comprehensive Income The following table summarizes the amounts reclassified out of accumulated other comprehensive loss attributable to the Company: Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Amortization of pension items: Pre-tax amount $ 2.2 $ 2.4 $ 4.4 $ 4.9 Tax (0.5 ) (0.5 ) (1.1 ) (1.2 ) Net of tax $ 1.7 $ 1.9 $ 3.3 $ 3.7 The pre-tax amounts in the table above are included within the components of net periodic pension benefit cost (see Note 12 to the Condensed Consolidated Financial Statements) and the tax amounts are included within the provision for taxes on income line within the Condensed Consolidated Statements of Income. The major components of accumulated other comprehensive loss, net of related tax, attributable to MTI are as follows: (millions of dollars) Foreign Currency Translation Adjustment Unrecognized Pension Costs Net Gain (Loss) on Derivative Instruments Total Balance as of December 31, 2018 $ (170.1 ) $ (69.7 ) $ 6.1 $ (233.7 ) Other comprehensive loss before reclassifications (19.5 ) — (2.0 ) (21.5 ) Amounts reclassified from AOCI — 3.3 — 3.3 Net current period other comprehensive income (loss) (19.5 ) 3.3 (2.0 ) (18.2 ) Cumulative effect of accounting change — (10.4 ) (0.5 ) (10.9 ) Balance as of June 30, 2019 $ (189.6 ) $ (76.8 ) $ 3.6 $ (262.8 ) In January 2019, the Company adopted the provisions of ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the U.S. Tax Cuts and Jobs Act. As a result, the Company reclassified $10.9 million from "Accumulated other comprehensive loss" to "Retained earnings" on the Condensed Consolidated Balance Sheet as of June 30, 2019.

Accounting for Asset Retirement

Accounting for Asset Retirement Obligations	6 Months Ended
	Jun. 30, 2019
Accounting for Asset Retirement Obligations [Abstract]
Accounting for Asset Retirement Obligations	Note 14. Accounting for Asset Retirement Obligations The Company records asset retirement obligations for situations in which the Company will be required to incur costs to retire tangible long-lived assets. The fair value of the liability for an asset retirement obligation is recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. The Company also records liabilities related to land reclamation as a part of asset retirement obligations. The Company mines various minerals using a surface mining process that requires the removal of overburden. In certain areas and under various governmental regulations, the Company is obligated to restore the land comprising each mining site to its original condition at the completion of the mining activity. The obligation is adjusted to reflect the passage of time, mining activities, and changes in estimated future cash outflows. The following is a reconciliation of asset retirement obligations as of June 30, 2019 : (millions of dollars) Asset retirement liability, December 31, 2018 $ 23.4 Accretion expense 1.4 Other 0.5 Payments (1.5 ) Foreign currency translation (0.1 ) Asset retirement liability, June 30, 2019 $ 23.7 The asset retirement costs are capitalized as part of the carrying amount of the associated asset. The current portion of the liability of approximately $0.4 million is included in other current liabilities and the long-term portion of the liability of approximately $23.3 million is included in other non-current liabilities in the Condensed Consolidated Balance Sheet as of June 30, 2019.

Contingencies

Contingencies	6 Months Ended
	Jun. 30, 2019
Contingencies [Abstract]
Contingencies	Note 15. Contingencies The Company is party to a number of lawsuits arising in the normal course of our business. Certain of the Company's subsidiaries are among numerous defendants in a number of cases seeking damages for exposure to silica or to asbestos containing materials. The Company currently has three pending silica cases and 71 pending asbestos cases. To date, 1,493 silica cases and 59 asbestos cases have been dismissed, not including any lawsuits against AMCOL or American Colloid Company dismissed prior to our acquisition of AMCOL. Thirteen and twenty new asbestos cases were filed during the three and six months ended June 30, 2019, respectively, and 16 additional asbestos cases were filed subsequent to the end of the second quarter. Two asbestos cases were dismissed during the first half of 2019 and no silica cases were dismissed during the period. Most of these claims do not provide adequate information to assess their merits, the likelihood that the Company will be found liable, or the magnitude of such liability, if any. Additional claims of this nature may be made against the Company or its subsidiaries. At this time management anticipates that the amount of the Company's liability, if any, and the cost of defending such claims, will not have a material effect on its financial position or results of operations. The Company has settled only one silica lawsuit, for a nominal amount, and no asbestos lawsuits to date (not including any that may have been settled by AMCOL prior to completion of the acquisition). We are unable to state an amount or range of amounts claimed in any of the lawsuits because state court pleading practices do not require identifying the amount of the claimed damage. The aggregate cost to the Company for the legal defense of these cases since inception continues to be insignificant. The majority of the costs of defense for these cases, excluding cases against AMCOL or American Colloid, are reimbursed by Pfizer Inc. pursuant to the terms of certain agreements entered into in connection with the Company's initial public offering in 1992. The Company is entitled to indemnification, pursuant to agreement, for sales prior to the initial public offering. Of the 71 pending asbestos cases, 45 of the non-AMCOL cases are subject to indemnification, in whole or in part, because the plaintiffs claim liability based on sales of products that occurred either entirely before the initial public offering, or both before and after the initial public offering. In twenty of the twenty two remaining non-AMCOL cases, the plaintiffs have not alleged dates of exposure, and in the remaining two non-AMCOL cases, exposure is alleged to have been after the Company's initial public offering in 1992. The remaining four cases involve AMCOL only, so no Pfizer indemnity is available. Our experience has been that the Company is not liable to plaintiffs in any of these lawsuits and the Company does not expect to pay any settlements or jury verdicts in these lawsuits. Environmental Matters On April 9, 2003, the Connecticut Department of Environmental Protection issued an administrative consent order relating to our Canaan, Connecticut, plant where both our Refractories segment and Specialty Minerals segment have operations. We agreed to the order, which includes provisions requiring investigation and remediation of contamination associated with historic use of polychlorinated biphenyls ("PCBs") and mercury at a portion of the site. We have completed the required investigations and submitted several reports characterizing the contamination and assessing site-specific risks. We are awaiting regulators’ approval of the risk assessment report, which will form the basis for a proposal by the Company concerning eventual remediation. We believe that the most likely form of overall site remediation will be to leave the existing contamination in place (with some limited soil removal), encapsulate it, and monitor the effectiveness of the encapsulation. We anticipate that a substantial portion of the remediation cost will be borne by the United States based on its involvement at the site from 1942 – 1964, as historic documentation indicates that PCBs and mercury were first used at the facility at a time of U.S. government ownership for production of materials needed by the military. Pursuant to a Consent Decree entered on October 24, 2014, the United States paid the Company $2.3 million in the 4th quarter of 2014 to resolve the Company’s claim for response costs for investigation and initial remediation activities at this facility through October 24, 2014. Contribution by the United States to any future costs of investigation or additional remediation has, by agreement, been left unresolved. Though the cost of the likely remediation remains uncertain pending completion of the phased remediation decision process, we have estimated that the Company’s share of the cost of the encapsulation and limited soil removal described above would approximate $0.4 million, which has been accrued as of June 30, 2019. The Company is evaluating options for upgrading the wastewater treatment facilities at its Adams, Massachusetts plant. This work has been undertaken pursuant to an administrative Consent Order originally issued by the Massachusetts Department of Environmental Protection (“DEP”) on June 18, 2002. This order was amended on June 1, 2009 and on June 2, 2010. The amended Order includes the investigation by January 1, 2022 of options for ensuring that the facility's wastewater treatment ponds will not result in unpermitted discharge to groundwater. Additional requirements of the amendment include the submittal by July 1, 2022 of a plan for closure of a historic lime solids disposal area. Preliminary engineering reviews completed in 2005 indicate that the estimated cost of wastewater treatment upgrades to operate this facility beyond 2024 may be between $6 million and $8 million. The Company estimates that the remaining remediation costs would approximate $0.4 million, which has been accrued as of June 30, 2019. The Company and its subsidiaries are not party to any other material pending legal proceedings, other than routine litigation incidental to their businesses.

Segment and Related Information

Segment and Related Information	6 Months Ended
	Jun. 30, 2019
Segment and Related Information [Abstract]
Segment and Related Information	Note 16. Segment and Related Information On a regular basis, the Company reviews its segments and the approach used by the chief operating decision maker to assess performance and allocate resources. The Company has four reportable segments: Performance Materials, Specialty Minerals, Refractories and Energy Services. See Note 1 to the Condensed Consolidated Financial Statements. Segment information for the three and six -month periods ended June 30, 2019 and July 1, 2018 is as follows: Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Net Sales Performance Materials $ 215.4 $ 214.5 $ 414.6 $ 401.8 Specialty Minerals 145.1 150.9 289.5 300.5 Refractories 77.5 79.6 151.3 154.9 Energy Services 25.8 19.7 46.1 38.8 Total $ 463.8 $ 464.7 $ 901.5 $ 896.0 Income from Operations Performance Materials $ 20.7 $ 29.6 $ 47.0 $ 55.8 Specialty Minerals 20.0 25.1 42.0 49.2 Refractories 7.1 10.3 19.2 23.1 Energy Services 0.9 0.7 3.3 2.2 Total $ 48.7 $ 65.7 $ 111.5 $ 130.3 A reconciliation of the totals reported for the operating segments to the applicable line items in the condensed consolidated financial statements is as follows: Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Income from operations for reportable segments $ 48.7 $ 65.7 $ 111.5 $ 130.3 Acquisition related transaction and integration costs — (1.0 ) — (1.4 ) Unallocated corporate expenses (3.2 ) (1.9 ) (4.0 ) (3.5 ) Consolidated income from operations 45.5 62.8 107.5 125.4 Non-operating deductions, net (13.3 ) (8.4 ) (26.1 ) (21.8 ) Income from operations before tax and equity in earnings $ 32.2 $ 54.4 $ 81.4 $ 103.6 The Company's sales by product category are as follows: Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Metalcasting $ 75.8 $ 88.8 $ 149.0 $ 168.0 Household, Personal Care & Specialty Products 69.0 58.6 143.9 107.3 Environmental Products 29.0 25.2 44.9 37.9 Building Materials 19.1 18.0 34.4 36.9 Basic Minerals 22.5 23.9 42.4 51.7 Performance Materials 215.4 214.5 414.6 401.8 Paper PCC 90.2 94.5 181.7 191.5 Specialty PCC 17.3 17.3 35.4 34.3 Ground Calcium Carbonate 24.8 25.2 47.1 47.7 Talc 12.8 13.9 25.3 27.0 Specialty Minerals 145.1 150.9 289.5 300.5 Refractory Products 61.0 66.7 123.0 129.0 Metallurgical Products 16.5 12.9 28.3 25.9 Refractories 77.5 79.6 151.3 154.9 Energy Services 25.8 19.7 46.1 38.8 Total $ 463.8 $ 464.7 $ 901.5 $ 896.0

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Basis of Presentation and Summary of Significant Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The Company employs accounting policies that are in accordance with U.S. generally accepted accounting principles and require management to make estimates and assumptions relating to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reported period. Significant estimates include those related to revenue recognition, valuation of long-lived assets, goodwill and other intangible assets, income taxes, including valuation allowances, and pension plan assumptions. Actual results could differ from those estimates.
Recently Issued Accounting Standards	Recently Issued Accounting Standards Changes to accounting principles generally accepted in the United States of America (U.S. GAAP) are established by the Financial Accounting Standards Board (FASB) in the form of accounting standards updates (ASUs) to the FASB’s Accounting Standards Codification. The Company considers the applicability and impact of all ASUs. All recently issued ASUs were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial position and results of operations. Recently Adopted Accounting Standards On January 1, 2019, the Company adopted the provisions of ASU 2016-02, “Leases”, which requires lessees to recognize most leases on-balance sheet. The Company has adopted this new standard under the modified retrospective transition method, using the effective date as our date of initial application. As such, financial information and required disclosures will not be provided for dates prior to January 1, 2019. The new standard provides a number of optional practical expedients in transition. We have elected the ‘package of practical expedients’, which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification and initial direct costs. The new standard also provides practical expedients for an entity’s ongoing accounting. We have elected the short-term lease recognition exemption for all leases that qualify. On adoption, we recognized additional operating liabilities of $ million with corresponding right-of-use assets of $ million based on the present value of the remaining lease payments under existing operating leases. As of December 31, 2018, we had $ million in deferred charges related to some of our real estate leases that were recorded against the right of use asset as part of the transition. The adoption of this standard did not have a material impact on the Company's financial statements. On January 1, 2019, the Company adopted the provisions of ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the U.S. Tax Cuts and Jobs Act. As a result, the Company reclassified $10.9 million from "Accumulated other comprehensive loss" to "Retained earnings" on the Condensed Consolidated Balance Sheets as of June 30, 2019.

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Components of Lease Cost	Operating lease cost was $4.0 million and $8.1 million for the three and six-month periods ended June 30, 2019, respectively. The components of lease costs are as follows: (millions of dollars) Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Operating lease cost $ 3.9 $ 7.9 Short-term lease cost 0.1 0.2 Total $ 4.0 $ 8.1
Supplemental Cash Flow Information and Non-cash Activity Related to Operating Leases	Supplemental cash flow information and non-cash activity related to our operating leases are as follows: (millions of dollars) June 30, 2019 Operating cash flows information: Cash paid for amounts included in the measurement of lease liabilities $ 8.3 Non-cash activity: Right-of-use assets obtained in the exchange for operating lease liabilities $ 3.3
Weighted Average Remaining Lease Term and Discount Rates	Weighted average remaining lease term, and weighted average discount rates related to the Company’s operating leases were as follows: Weighted-average remaining operating lease term (in years) 7.80 Weighted-average operating leases discount rate 5.0 %
Outstanding Lease Assets and Liabilities	The following table summarizes the Company's outstanding lease assets and liabilities and their classification on the Condensed Consolidated Balance Sheet: (millions of dollars) Balance Sheet Classification June 30, 2019 Right-of-use asset Other assets and deferred charges $ 47.1 Lease liability - current Other current liabilities 12.0 Lease liability - non-current Other non-current liabilities 46.1
Future Minimum Lease Payments	Future minimum lease payments under the Company's operating leases as of June 30, 2019 were as follows: (millions of dollars) June 30, 2019 For the remainder of 2019 $ 7.7 2020 13.0 2021 9.6 2022 7.7 2023 6.2 Thereafter 26.3 Total future minimum lease payments 70.5 Less imputed interest (12.6 ) Total $ 57.9
Minimum Lease Payments under Non-cancellable Operating Lease	As of December 31, 2018, minimum lease payments under non-cancellable operating leases were expected to be as follows: (millions of dollars) Dec. 31, 2018 2019 $ 17.3 2020 13.0 2021 9.5 2022 8.2 2023 7.0 Thereafter 24.8 Total $ 79.8
Summary of Rent Expense	A summary of rent expense for the fiscal years ended December 31, 2018 and December 31, 2017 was as follows: (millions of dollars) Dec. 31, 2018 Dec. 31, 2017 Rent expense $ 19.5 $ 19.3

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue from Contracts with Customers [Abstract]
Disaggregation of Revenue	The following table disaggregates our revenue by major source (product line) for the three and six -month periods ended June 30, 2019 and July 1, 2018 : (millions of dollars) Three Months Ended Six Months Ended Net Sales June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Metalcasting $ 75.8 $ 88.8 $ 149.0 $ 168.0 Household, Personal Care and Specialty Products 69.0 58.6 143.9 107.3 Environmental Products 29.0 25.2 44.9 37.9 Building Materials 19.1 18.0 34.4 36.9 Basic Minerals 22.5 23.9 42.4 51.7 Performance Materials 215.4 214.5 414.6 401.8 Paper PCC 90.2 94.5 181.7 191.5 Specialty PCC 17.3 17.3 35.4 34.3 Ground Calcium Carbonate 24.8 25.2 47.1 47.7 Talc 12.8 13.9 25.3 27.0 Specialty Minerals 145.1 150.9 289.5 300.5 Refractory Products 61.0 66.7 123.0 129.0 Metallurgical Products 16.5 12.9 28.3 25.9 Refractories 77.5 79.6 151.3 154.9 Energy Services 25.8 19.7 46.1 38.8 Total $ 463.8 $ 464.7 $ 901.5 $ 896.0

Business Combination (Tables)

Business Combination (Tables)	6 Months Ended
	Jun. 30, 2019
Business Combination [Abstract]
Preliminary Purchase Price Allocation for the Sivomatic Acquisition	The following table summarizes the Company’s final amounts recognized for assets acquired and liabilities assumed for the Sivomatic acquisition as compared with the allocation previously reported on the Company's Form 10-K for the year ended December 31, 2018: (millions of dollars) Preliminary Allocation Previously Reported on Form 10-K as of December 31, 2018 Increase/ (Decrease) Final Allocation Accounts receivable $ 24.4 $ — $ 24.4 Inventories 15.6 — 15.6 Other current assets 0.6 — 0.6 Mineral rights 39.7 — 39.7 Property, plant and equipment 28.3 — 28.3 Goodwill 35.0 — 35.0 Intangible assets 26.4 — 26.4 Total assets acquired 170.0 — 170.0 Current maturity of long-term debt 5.7 — 5.7 Accounts payable 9.0 — 9.0 Accrued expenses 5.6 — 5.6 Long-term debt 5.3 — 5.3 Non-current deferred tax liability 19.7 — 19.7 Other non-current liabilities 2.2 — 2.2 Total liabilities assumed 47.5 — 47.5 Net assets acquired $ 122.5 $ — $ 122.5

Earnings per Share (EPS) (Table

Earnings per Share (EPS) (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings per Share (EPS) [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share: Three Months Ended Six Months Ended (in millions, except per share data) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Net income attributable to Minerals Technologies Inc. $ 26.6 $ 44.1 $ 65.7 $ 84.0 Weighted average shares outstanding 35.2 35.3 35.2 35.4 Dilutive effect of stock options and stock units 0.1 0.3 0.1 0.2 Weighted average shares outstanding, adjusted 35.3 35.6 35.3 35.6 Basic earnings per share attributable to Minerals Technologies Inc. $ 0.76 $ 1.25 $ 1.87 $ 2.37 Diluted earnings per share attributable to Minerals Technologies Inc. $ 0.75 $ 1.24 $ 1.86 $ 2.36

Restructuring and Other Items_2

Restructuring and Other Items, net (Tables)	6 Months Ended
	Jun. 30, 2019
Restructuring and Other Items, net [Abstract]
Schedule of Restructuring Charges	The following table outlines the amount of restructuring charges recorded within the Consolidated Statements of Income and the segments they relate to for the three months ended June 30, 2019 : (millions of dollars) June 30, 2019 Impairment of assets Performance Materials $ 4.2 Specialty Minerals 1.6 Energy Services 1.7 Total impairment of assets charges $ 7.5 Severance and other related costs Performance Materials $ 2.8 Specialty Minerals 0.9 Refractories 0.8 Energy Services 0.1 Corporate 1.1 Total severance and other related costs $ 5.7 Total restructuring and other items, net $ 13.2
Reconciliation of Restructuring Liability	The following table is a reconciliation of our restructuring liability balance as of June 30, 2019 : (millions of dollars) Restructuring liability, December 31, 2018 $ 2.5 Additional provisions 5.7 Cash payments (1.1 ) Restructuring liability, June 30, 2019 $ 7.1

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2019
Inventories [Abstract]
Inventories by Major Category	The following is a summary of inventories by major category: (millions of dollars) June 30, 2019 Dec. 31, 2018 Raw materials $ 102.8 $ 93.4 Work-in-process 10.0 11.2 Finished goods 98.7 92.2 Packaging and supplies 46.9 42.4 Total inventories $ 258.4 $ 239.2

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2019
Goodwill and Other Intangible Assets [Abstract]
Intangible Assets Subject to Amortization	Intangible assets subject to amortization as of June 30, 2019 and December 31, 2018 were as follows: June 30, 2019 Dec. 31, 2018 (millions of dollars) Weighted Average Useful Life (Years) Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Tradenames 35 $ 203.9 $ 29.5 $ 204.2 $ 26.6 Technology 13 18.8 7.2 18.8 6.4 Patents 19 6.4 5.8 6.4 5.6 Customer relationships 22 25.1 3.8 26.5 3.2 32 $ 254.2 $ 46.3 $ 255.9 $ 41.8

Long-Term Debt and Commitments

Long-Term Debt and Commitments (Tables)	6 Months Ended
	Jun. 30, 2019
Long-Term Debt and Commitments [Abstract]
Long Term Debt	The following is a summary of long-term debt: ( millions of dollars) June 30, 2019 Dec. 31, 2018 Term Loan Facility-Variable Tranche due February 14, 2024, net of unamortized discount and deferred financing costs of $17.8 million and $19.4 million $ 640.3 $ 638.6 Term Loan Facility- Fixed Tranche due May 9, 2021, net of unamortized discount and deferred financing costs of $0.3 million and $0.3 million 227.7 262.6 Netherlands Term Loan due 2020 2.3 3.4 Netherlands Term Loan due 2022 1.1 1.4 Japan Loan Facilities 4.9 5.1 Total 876.3 911.1 Less: Current maturities 2.1 3.3 Total long-term debt $ 874.2 $ 907.8

Benefit Plans (Tables)

Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2019
Benefit Plans [Abstract]
Net Periodic Benefit Cost	Components of Net Periodic Benefit Cost Pension Benefits Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Service cost $ 1.8 $ 2.0 $ 3.6 $ 3.9 Interest cost 3.6 3.0 7.1 6.1 Expected return on plan assets (4.6 ) (4.8 ) (9.2 ) (9.6 ) Amortization: Prior service cost 0.1 0.1 0.2 0.2 Recognized net actuarial loss 2.3 2.7 4.6 5.5 Net periodic benefit cost $ 3.2 $ 3.0 $ 6.3 $ 6.1 Other Benefits Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Service cost $ 0.1 $ 0.1 $ 0.1 $ 0.1 Interest cost — — 0.1 0.1 Amortization: Prior service cost — (0.2 ) — (0.4 ) Recognized net actuarial (gain) loss (0.2 ) (0.2 ) (0.4 ) (0.4 ) Net periodic benefit cost $ (0.1 ) $ (0.3 ) $ (0.2 ) $ (0.6 )

Comprehensive Income (Tables)

Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2019
Comprehensive Income [Abstract]
Reclassifications Out of Accumulated Other Comprehensive Loss	The following table summarizes the amounts reclassified out of accumulated other comprehensive loss attributable to the Company: Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Amortization of pension items: Pre-tax amount $ 2.2 $ 2.4 $ 4.4 $ 4.9 Tax (0.5 ) (0.5 ) (1.1 ) (1.2 ) Net of tax $ 1.7 $ 1.9 $ 3.3 $ 3.7
Accumulated Other Comprehensive Loss, Net of Related Tax, Attributable to MTI	The major components of accumulated other comprehensive loss, net of related tax, attributable to MTI are as follows: (millions of dollars) Foreign Currency Translation Adjustment Unrecognized Pension Costs Net Gain (Loss) on Derivative Instruments Total Balance as of December 31, 2018 $ (170.1 ) $ (69.7 ) $ 6.1 $ (233.7 ) Other comprehensive loss before reclassifications (19.5 ) — (2.0 ) (21.5 ) Amounts reclassified from AOCI — 3.3 — 3.3 Net current period other comprehensive income (loss) (19.5 ) 3.3 (2.0 ) (18.2 ) Cumulative effect of accounting change — (10.4 ) (0.5 ) (10.9 ) Balance as of June 30, 2019 $ (189.6 ) $ (76.8 ) $ 3.6 $ (262.8 )

Accounting for Asset Retireme_2

Accounting for Asset Retirement Obligations (Tables)	6 Months Ended
	Jun. 30, 2019
Accounting for Asset Retirement Obligations [Abstract]
Reconciliation of Asset Retirement Obligations	The following is a reconciliation of asset retirement obligations as of June 30, 2019 : (millions of dollars) Asset retirement liability, December 31, 2018 $ 23.4 Accretion expense 1.4 Other 0.5 Payments (1.5 ) Foreign currency translation (0.1 ) Asset retirement liability, June 30, 2019 $ 23.7

Segment and Related Informati_2

Segment and Related Information (Tables)	6 Months Ended
	Jun. 30, 2019
Segment and Related Information [Abstract]
Segment Information	On a regular basis, the Company reviews its segments and the approach used by the chief operating decision maker to assess performance and allocate resources. The Company has four reportable segments: Performance Materials, Specialty Minerals, Refractories and Energy Services. See Note 1 to the Condensed Consolidated Financial Statements. Segment information for the three and six -month periods ended June 30, 2019 and July 1, 2018 is as follows: Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Net Sales Performance Materials $ 215.4 $ 214.5 $ 414.6 $ 401.8 Specialty Minerals 145.1 150.9 289.5 300.5 Refractories 77.5 79.6 151.3 154.9 Energy Services 25.8 19.7 46.1 38.8 Total $ 463.8 $ 464.7 $ 901.5 $ 896.0 Income from Operations Performance Materials $ 20.7 $ 29.6 $ 47.0 $ 55.8 Specialty Minerals 20.0 25.1 42.0 49.2 Refractories 7.1 10.3 19.2 23.1 Energy Services 0.9 0.7 3.3 2.2 Total $ 48.7 $ 65.7 $ 111.5 $ 130.3
Reconciliation of Income From Operations Before Provision for Taxes on Income	A reconciliation of the totals reported for the operating segments to the applicable line items in the condensed consolidated financial statements is as follows: Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Income from operations for reportable segments $ 48.7 $ 65.7 $ 111.5 $ 130.3 Acquisition related transaction and integration costs — (1.0 ) — (1.4 ) Unallocated corporate expenses (3.2 ) (1.9 ) (4.0 ) (3.5 ) Consolidated income from operations 45.5 62.8 107.5 125.4 Non-operating deductions, net (13.3 ) (8.4 ) (26.1 ) (21.8 ) Income from operations before tax and equity in earnings $ 32.2 $ 54.4 $ 81.4 $ 103.6
Sales by Product Category	The Company's sales by product category are as follows: Three Months Ended Six Months Ended (millions of dollars) June 30, 2019 July 1, 2018 June 30, 2019 July 1, 2018 Metalcasting $ 75.8 $ 88.8 $ 149.0 $ 168.0 Household, Personal Care & Specialty Products 69.0 58.6 143.9 107.3 Environmental Products 29.0 25.2 44.9 37.9 Building Materials 19.1 18.0 34.4 36.9 Basic Minerals 22.5 23.9 42.4 51.7 Performance Materials 215.4 214.5 414.6 401.8 Paper PCC 90.2 94.5 181.7 191.5 Specialty PCC 17.3 17.3 35.4 34.3 Ground Calcium Carbonate 24.8 25.2 47.1 47.7 Talc 12.8 13.9 25.3 27.0 Specialty Minerals 145.1 150.9 289.5 300.5 Refractory Products 61.0 66.7 123.0 129.0 Metallurgical Products 16.5 12.9 28.3 25.9 Refractories 77.5 79.6 151.3 154.9 Energy Services 25.8 19.7 46.1 38.8 Total $ 463.8 $ 464.7 $ 901.5 $ 896.0

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)Segment	Dec. 31, 2018USD ($)
Basis of Presentation and Summary of Significant Accounting Policies [Abstract]
Number of reportable segments | Segment	4
Recently Adopted Accounting Standards [Abstract]
Operating liabilities	$ 57.9
Right-of-use assets	47.1
ASU 2016-02 [Member]
Recently Adopted Accounting Standards [Abstract]
Operating liabilities		$ 61.4
Right-of-use assets		50.5
Deferred charges		10.9
ASU 2018-02 [Member]
Recently Adopted Accounting Standards [Abstract]
Reclassification of certain tax effects from accumulated other comprehensive income		0
ASU 2018-02 [Member] | Retained Earnings [Member]
Recently Adopted Accounting Standards [Abstract]
Reclassification of certain tax effects from accumulated other comprehensive income	10.9	10.9
ASU 2018-02 [Member] | Accumulated Other Comprehensive Loss [Member]
Recently Adopted Accounting Standards [Abstract]
Reclassification of certain tax effects from accumulated other comprehensive income	$ (10.9)	$ (10.9)

Leases (Details)

Leases (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Lease Cost [Abstract]
Operating lease cost	$ 3.9	$ 7.9
Short-term lease cost	0.1	0.2
Total	$ 4	8.1
Operating cash flows information [Abstract]
Cash paid for amounts included in the measurement of lease liabilities		8.3
Non-cash activity [Abstract]
Right-of-use assets obtained in the exchange for operating lease liabilities		$ 3.3
Weighted Average Remaining Lease Term and Discount Rates [Abstract]
Weighted-average remaining operating lease term	7 years 9 months 18 days	7 years 9 months 18 days
Weighted-average operating leases discount rate	5.00%	5.00%
Outstanding Lease Assets and Liabilities [Abstract]
Right-of-use asset	$ 47.1	$ 47.1
Lease liability - current	12	12
Lease liability - non-current	46.1	46.1
Future Minimum Lease Payments [Abstract]
For the remainder of 2019	7.7	7.7
2020	13	13
2021	9.6	9.6
2022	7.7	7.7
2023	6.2	6.2
Thereafter	26.3	26.3
Total future minimum lease payments	70.5	70.5
Less imputed interest	(12.6)	(12.6)
Total	$ 57.9	$ 57.9
Minimum Lease Payments under Non-cancellable Operating Leases [Abstract]
2019			$ 17.3
2020			13
2021			9.5
2022			8.2
2023			7
Thereafter			24.8
Total			79.8
Rent Expense [Abstract]
Rent expense			$ 19.5	$ 19.3
Minimum [Member]
Operating Leases [Abstract]
Remaining lease terms		1 year
Maximum [Member]
Operating Leases [Abstract]
Remaining lease terms		50 years

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Disaggregation of Revenue [Abstract]
Total net sales	$ 463.8	$ 464.7	$ 901.5	$ 896
Performance Materials [Member]
Disaggregation of Revenue [Abstract]
Total net sales	215.4	214.5	414.6	401.8
Performance Materials [Member] | Metalcasting [Member]
Disaggregation of Revenue [Abstract]
Total net sales	75.8	88.8	149	168
Performance Materials [Member] | Household, Personal Care & Specialty Products [Member]
Disaggregation of Revenue [Abstract]
Total net sales	69	58.6	143.9	107.3
Performance Materials [Member] | Environmental Products [Member]
Disaggregation of Revenue [Abstract]
Total net sales	29	25.2	44.9	37.9
Performance Materials [Member] | Building Materials [Member]
Disaggregation of Revenue [Abstract]
Total net sales	19.1	18	34.4	36.9
Performance Materials [Member] | Basic Minerals [Member]
Disaggregation of Revenue [Abstract]
Total net sales	22.5	23.9	42.4	51.7
Specialty Minerals [Member]
Disaggregation of Revenue [Abstract]
Total net sales	145.1	150.9	289.5	300.5
Specialty Minerals [Member] | Paper PCC [Member]
Disaggregation of Revenue [Abstract]
Total net sales	90.2	94.5	181.7	191.5
Specialty Minerals [Member] | Specialty PCC [Member]
Disaggregation of Revenue [Abstract]
Total net sales	17.3	17.3	35.4	34.3
Specialty Minerals [Member] | Ground Calcium Carbonate [Member]
Disaggregation of Revenue [Abstract]
Total net sales	24.8	25.2	47.1	47.7
Specialty Minerals [Member] | Talc [Member]
Disaggregation of Revenue [Abstract]
Total net sales	12.8	13.9	25.3	27
Refractories [Member]
Disaggregation of Revenue [Abstract]
Total net sales	77.5	79.6	151.3	154.9
Refractories [Member] | Refractory Products [Member]
Disaggregation of Revenue [Abstract]
Total net sales	61	66.7	123	129
Refractories [Member] | Metallurgical Products [Member]
Disaggregation of Revenue [Abstract]
Total net sales	16.5	12.9	28.3	25.9
Energy Services [Member]
Disaggregation of Revenue [Abstract]
Total net sales	$ 25.8	$ 19.7	$ 46.1	$ 38.8

Business Combination (Details)

Business Combination (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019		Dec. 31, 2018
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 807.9	[1]	$ 812.4	[2]
Sivomatic [Member]
Business Combination [Abstract]
Total consideration transferred, net of cash acquired	122.5
Additional deferred tax liability	$ 18.8
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable			24.4
Inventories			15.6
Other current assets			0.6
Mineral rights			39.7
Property, plant and equipment			28.3
Goodwill			35
Intangible assets			26.4
Total assets acquired			170
Current maturity of long term debt			5.7
Accounts payable			9
Accrued expenses			5.6
Long term debt			5.3
Non-current deferred tax liability			19.7
Other non-current liabilities			2.2
Total liabilities assumed			47.5
Net assets acquired			122.5
Sivomatic [Member] | Previously Reported [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable			24.4
Inventories			15.6
Other current assets			0.6
Mineral rights			39.7
Property, plant and equipment			28.3
Goodwill			35
Intangible assets			26.4
Total assets acquired			170
Current maturity of long term debt			5.7
Accounts payable			9
Accrued expenses			5.6
Long term debt			5.3
Non-current deferred tax liability			19.7
Other non-current liabilities			2.2
Total liabilities assumed			47.5
Net assets acquired			122.5
Sivomatic [Member] | Increase/(Decrease) [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable			0
Inventories			0
Other current assets			0
Mineral rights			0
Property, plant and equipment			0
Goodwill			0
Intangible assets			0
Total assets acquired			0
Current maturity of long term debt			0
Accounts payable			0
Accrued expenses			0
Long term debt			0
Non-current deferred tax liability			0
Other non-current liabilities			0
Total liabilities assumed			0
Net assets acquired			$ 0
Sivomatic [Member] | Trade Names [Member]
Business Combination [Abstract]
Estimated useful life of intangible assets acquired	20 years
Sivomatic [Member] | Customer Relationships [Member]
Business Combination [Abstract]
Estimated useful life of intangible assets acquired	20 years
[1]	Unaudited
[2]	Condensed from audited financial statements

Earnings per Share (EPS) (Detai

Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Earnings per Share (EPS) [Abstract]
Net income attributable to Minerals Technologies Inc.	$ 26.6	$ 44.1	$ 65.7	$ 84
Weighted average shares outstanding (in shares)	35,200,000	35,300,000	35,200,000	35,400,000
Dilutive effect of stock options and stock units (in shares)	100,000	300,000	100,000	200,000
Weighted average shares outstanding, adjusted (in shares)	35,300,000	35,600,000	35,300,000	35,600,000
Basic earnings per share attributable to Minerals Technologies Inc. (in dollars per share)	$ 0.76	$ 1.25	$ 1.87	$ 2.37
Diluted earnings per share attributable to Minerals Technologies Inc. (in dollars per share)	$ 0.75	$ 1.24	$ 1.86	$ 2.36
Stock Options [Member]
Antidilutive Securities Excluded from Earnings Per Share Calculation [Abstract]
Anti-dilutive securities not included in the weighted average commons shares outstanding calculation (in shares)	470,304	357,771	470,304	357,771

Restructuring and Other Items_3

Restructuring and Other Items, net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Restructuring and Other Items, net [Abstract]
Annualized savings expected from restructuring program			$ 12
Restructuring Charges [Abstract]
Impairment of assets charges	$ 7.5		7.5	$ 0
Severance and other related costs	5.7
Total restructuring and other items, net	13.2	$ 0.4	13.2	$ 0.4
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning of period			2.5
Additional provisions			5.7
Cash payments			(1.1)
Restructuring liability, ending of period	7.1		$ 7.1
Performance Materials [Member]
Restructuring Charges [Abstract]
Impairment of assets charges	4.2
Severance and other related costs	2.8
Specialty Minerals [Member]
Restructuring Charges [Abstract]
Impairment of assets charges	1.6
Severance and other related costs	0.9
Refractories [Member]
Restructuring Charges [Abstract]
Severance and other related costs	0.8
Energy Services [Member]
Restructuring Charges [Abstract]
Impairment of assets charges	1.7
Severance and other related costs	0.1
Corporate [Member]
Restructuring Charges [Abstract]
Severance and other related costs	$ 1.1

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Income Taxes [Abstract]
Provision for taxes on income	$ 5.1	$ 10.3	$ 14.4	$ 19.6
Effective income tax rate	15.80%	18.90%
Amount of unrecognized tax benefits	$ 15.5		15.5
Unrecognized tax benefits that would impact effective tax rate	11.9		11.9
Unrecognized tax benefits, net decrease in penalties and interest expenses	(0.1)		(0.2)
Unrecognized tax benefits, accrued interest and penalties	$ 2.8		$ 2.8

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2019		Dec. 31, 2018
Inventories [Abstract]
Raw materials	$ 102.8		$ 93.4
Work-in-process	10		11.2
Finished goods	98.7		92.2
Packaging and supplies	46.9		42.4
Total inventories	$ 258.4	[1]	$ 239.2	[2]
[1]	Unaudited
[2]	Condensed from audited financial statements

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019		Dec. 31, 2018
Goodwill and Other Intangible Assets [Abstract]
Goodwill	$ 807.9	[1]	$ 812.4	[2]
Finite-Lived Intangible Assets [Abstract]
Weighted average useful life	32 years
Gross carrying amount	$ 254.2		255.9
Accumulated amortization	$ 46.3		41.8
Tradenames [Member]
Finite-Lived Intangible Assets [Abstract]
Weighted average useful life	35 years
Gross carrying amount	$ 203.9		204.2
Accumulated amortization	$ 29.5		26.6
Technology [Member]
Finite-Lived Intangible Assets [Abstract]
Weighted average useful life	13 years
Gross carrying amount	$ 18.8		18.8
Accumulated amortization	$ 7.2		6.4
Patents [Member]
Finite-Lived Intangible Assets [Abstract]
Weighted average useful life	19 years
Gross carrying amount	$ 6.4		6.4
Accumulated amortization	$ 5.8		5.6
Customer Relationships [Member]
Finite-Lived Intangible Assets [Abstract]
Weighted average useful life	22 years
Gross carrying amount	$ 25.1		26.5
Accumulated amortization	$ 3.8		$ 3.2
[1]	Unaudited
[2]	Condensed from audited financial statements

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets, Amortization (Details) - Acquired Finite-Lived Intangible Assets [Member] $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Amortization Expense, Fiscal Year Maturity [Abstract]
Weighted average amortization period for intangible assets subject to amortization	32 years
Estimated amortization expense, remainder of 2019	$ 4.8
Estimated amortization expense, 2020	36.7
Estimated amortization expense, 2021	36.7
Estimated amortization expense, 2022	36.7
Estimated amortization expense, 2023	36.7
Estimated amortization expense, thereafter	$ 166.4

Derivative Financial Instrume_2

Derivative Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jul. 01, 2018	Jul. 03, 2016
Interest Rate Swaps [Member] | Other Non-current Liabilities [Member]
Derivative, Fair Value [Abstract]
Notional amount	$ 150
Fair value of derivative liability	6.6
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]
Derivative, Fair Value [Abstract]
Notional amount	114		$ 300
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets and Deferred Charges [Member]
Derivative, Fair Value [Abstract]
Fair value of derivative assets	0.9
Cross Currency Rate Swap [Member] | Other Assets and Deferred Charges [Member]
Derivative, Fair Value [Abstract]
Notional amount	150	$ 150
Fair value of derivative assets	$ 7

Long-Term Debt and Commitment_2

Long-Term Debt and Commitments (Details) - USD ($) $ in Millions	Feb. 14, 2017	Jun. 30, 2019		Jun. 30, 2019		Jul. 01, 2018	Dec. 31, 2018		Jun. 23, 2015	May 09, 2014
Debt Instruments [Abstract]
Debt		$ 876.3		$ 876.3			$ 911.1
Less: Current maturities		2.1	[1]	2.1	[1]		3.3	[2]
Total long-term debt		$ 874.2	[1]	874.2	[1]		907.8	[2]
Repayment of long-term debt				(36.6)		$ (6.6)
Proceeds from issuance of short-term debt				$ 0		$ 113
Minimum [Member]
Debt Instruments [Abstract]
Net leverage ratio				3.50
Maximum [Member]
Debt Instruments [Abstract]
Net leverage ratio				5.25
Sivomatic [Member]
Debt Instruments [Abstract]
Repayment of long-term debt				$ (1.3)
Acquisition related long-term debt assumed at fair value				10.7
Euribor [Member] | Sivomatic [Member]
Debt Instruments [Abstract]
Basis spread on variable rate		2.00%
Term Loan Facility [Member]
Debt Instruments [Abstract]
Maximum borrowing capacity										$ 1,560
Line of credit outstanding									$ 1,378
Repayment of long-term debt				$ (35)
Term Loan Facility [Member] | Variable Tranche [Member]
Debt Instruments [Abstract]
Line of credit outstanding	$ 788								1,078
Interest rate		0.75%		0.75%
Basis spread on variable rate		2.25%
Decrease in basis spread on variable rate	(0.75%)
Debt issue discount		0.25%
Required annual amortization		1.00%
Term Loan Facility [Member] | Fixed Rate Tranche [Member]
Debt Instruments [Abstract]
Line of credit outstanding									$ 300
Interest rate		4.75%		4.75%
Debt issue discount		0.25%
Term Loan Facility, Due February 14, 2024 [Member]
Debt Instruments [Abstract]
Debt		$ 640.3		$ 640.3			638.6
Long-term debt, unamortized discount and deferred financing costs		17.8		$ 17.8			19.4
Maturity date				Feb. 14, 2024
Term Loan Facility Due May 9, 2021 [Member]
Debt Instruments [Abstract]
Debt		227.7		$ 227.7			262.6
Long-term debt, unamortized discount and deferred financing costs		0.3		$ 0.3			0.3
Maturity date				May 9, 2021
Netherlands Term Loan Due 2020 [Member]
Debt Instruments [Abstract]
Debt		2.3		$ 2.3			3.4
Netherlands Term Loan Due 2022 [Member]
Debt Instruments [Abstract]
Debt		1.1		1.1			1.4
Japan Loan Facilities [Member]
Debt Instruments [Abstract]
Debt		4.9		4.9			5.1
Repayment of long-term debt				$ (0.3)
Revolving Credit Facility [Member]
Debt Instruments [Abstract]
Maturity date				Apr. 18, 2023
Maximum borrowing capacity		300		$ 300						$ 200
Line of credit outstanding		$ 100		$ 100
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instruments [Abstract]
Decrease in basis spread on variable rate				0.25%
Revolving Credit Facility [Member] | Sivomatic [Member]
Debt Instruments [Abstract]
Proceeds from issuance of short-term debt							$ 113
Revolving Credit Facility [Member] | LIBOR [Member]
Debt Instruments [Abstract]
Basis spread on variable rate		1.625%
Letter of Credit [Member]
Debt Instruments [Abstract]
Maximum borrowing capacity		$ 15		$ 15
Letters of credit outstanding		10.4		10.4
Short-Term Bank Credit Lines [Member]
Debt Instruments [Abstract]
Maximum borrowing capacity		43.5		43.5
Line of credit outstanding		$ 4.2		$ 4.2
[1]	Unaudited
[2]	Condensed from audited financial statements

Benefit Plans (Details)

Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Benefit Plans [Abstract]
Maximum percentage of total benefit obligation for international pension plans	25.00%		25.00%
Pension Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	$ 1.8	$ 2	$ 3.6	$ 3.9
Interest cost	3.6	3	7.1	6.1
Expected return on plan assets	(4.6)	(4.8)	(9.2)	(9.6)
Amortization [Abstract]
Prior service cost	0.1	0.1	0.2	0.2
Recognized net actuarial (gain) loss	2.3	2.7	4.6	5.5
Net periodic benefit cost	3.2	3	6.3	6.1
Employer Contributions [Abstract]
Expected employer contribution to its benefit plans	9.7		9.7
Employer contribution to benefit plans			3.1
Other Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	0.1	0.1	0.1	0.1
Interest cost	0	0	0.1	0.1
Amortization [Abstract]
Prior service cost	0	(0.2)	0	(0.4)
Recognized net actuarial (gain) loss	(0.2)	(0.2)	(0.4)	(0.4)
Net periodic benefit cost	(0.1)	$ (0.3)	(0.2)	$ (0.6)
Employer Contributions [Abstract]
Expected employer contribution to its benefit plans	$ 0.3		0.3
Other Benefits [Member] | Maximum [Member]
Employer Contributions [Abstract]
Employer contribution to benefit plans			$ 0.1

Comprehensive Income, Reclassif

Comprehensive Income, Reclassification Out of Accumulated Other Comprehensive Loss (Details) - Pension Costs [Member] - Reclassification out of Accumulated Other Comprehensive Loss [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Amortization of pension items [Abstract]
Pre-tax amount	$ 2.2	$ 2.4	$ 4.4	$ 4.9
Tax	(0.5)	(0.5)	(1.1)	(1.2)
Net of tax	$ 1.7	$ 1.9	$ 3.3	$ 3.7

Comprehensive Income, Accumulat

Comprehensive Income, Accumulated Other Comprehensive Loss, Net of Related Tax (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jul. 01, 2018	Apr. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Dec. 31, 2018
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period	[1]		$ 1,353.5			$ 1,353.5
Total other comprehensive loss, net of tax		$ (20.3)	2.4	$ (53.9)	$ 18.7	(17.9)	$ (35.1)
Balance at end of period	[2]	1,390.9				1,390.9
ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change								$ 0
Retained Earnings [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Total other comprehensive loss, net of tax		0	0	0	0
Retained Earnings [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change		10.9				10.9		10.9
Accumulated Other Comprehensive Income (Loss) [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period			(233.7)			(233.7)
Other comprehensive loss before reclassifications						(21.5)
Amounts reclassified from AOCI						3.3
Total other comprehensive loss, net of tax		(20.1)	1.9	$ (52.3)	$ 18.2	(18.2)
Balance at end of period		(262.8)				(262.8)
Accumulated Other Comprehensive Income (Loss) [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change		(10.9)				(10.9)		(10.9)
Foreign Currency Translation Adjustment [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period			(170.1)			(170.1)
Other comprehensive loss before reclassifications						(19.5)
Amounts reclassified from AOCI						0
Total other comprehensive loss, net of tax						(19.5)
Balance at end of period		(189.6)				(189.6)
Foreign Currency Translation Adjustment [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change								0
Unrecognized Pension Costs [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period			(69.7)			(69.7)
Other comprehensive loss before reclassifications						0
Amounts reclassified from AOCI						3.3
Total other comprehensive loss, net of tax						3.3
Balance at end of period		(76.8)				(76.8)
Unrecognized Pension Costs [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change								(10.4)
Net Gain (Loss) on Derivative Instruments [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period			$ 6.1			6.1
Other comprehensive loss before reclassifications						(2)
Amounts reclassified from AOCI						0
Total other comprehensive loss, net of tax						(2)
Balance at end of period		$ 3.6				$ 3.6
Net Gain (Loss) on Derivative Instruments [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change								$ (0.5)
[1]	Condensed from audited financial statements
[2]	Unaudited

Accounting for Asset Retireme_3

Accounting for Asset Retirement Obligations (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Asset retirement obligation [Roll Forward]
Asset retirement liability, beginning of period	$ 23.4
Accretion expense	1.4
Other	0.5
Payments	(1.5)
Foreign currency translation	(0.1)
Asset retirement liability, ending of period	23.7
Asset Retirement Obligation [Abstract]
Asset retirement obligation current portion	0.4
Asset retirement obligation noncurrent portion	$ 23.3

Contingencies (Details)

Contingencies (Details) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 31, 2019Case	Jun. 30, 2019USD ($)Case	Jun. 30, 2019USD ($)Case	Oct. 24, 2014USD ($)
Site Contingency [Abstract]
Consent decree paid by US government | $				$ 2.3
Silica Cases [Member]
Loss Contingency, Information about Litigation Matters [Abstract] [Abstract]
Number of pending cases		3	3
Cumulative number of cases dismissed		1,493	1,493
Number of cases dismissed			0
Number of lawsuits settled			1
Asbestos Cases [Member]
Loss Contingency, Information about Litigation Matters [Abstract] [Abstract]
Number of pending cases		71	71
Cumulative number of cases dismissed		59	59
Number of new cases filed		13	20
Number of cases dismissed			2
Number of lawsuits settled			0
Number of cases claim liability			45
Number of cases with no alleged exposure date			20
Number of allege liability			22
Asbestos Cases [Member] | Subsequent Event [Member]
Loss Contingency, Information about Litigation Matters [Abstract] [Abstract]
Number of new cases filed	16
Administrative Consent Order for Contamination Associated with Historic Use of PCBs [Member]
Site Contingency [Abstract]
Estimated accrued remediation cost | $		$ 0.4	$ 0.4
Administrative Consent Order for Installation of Groundwater Contamination System [Member]
Site Contingency [Abstract]
Estimated accrued remediation cost | $		$ 0.4	0.4
Estimated cost of wastewater treatment upgrades, lower range | $			6
Estimated cost of wastewater treatment upgrades, upper range | $			$ 8

Segment and Related Informati_3

Segment and Related Information, Reportable Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jul. 01, 2018USD ($)	Jun. 30, 2019USD ($)Segment	Jul. 01, 2018USD ($)
Segment Reporting Information [Abstract]
Number of reportable segments | Segment			4
Net sales	$ 463.8	$ 464.7	$ 901.5	$ 896
Income from operations	45.5	62.8	107.5	125.4
Performance Materials [Member]
Segment Reporting Information [Abstract]
Net sales	215.4	214.5	414.6	401.8
Specialty Minerals [Member]
Segment Reporting Information [Abstract]
Net sales	145.1	150.9	289.5	300.5
Refractories [Member]
Segment Reporting Information [Abstract]
Net sales	77.5	79.6	151.3	154.9
Energy Services [Member]
Segment Reporting Information [Abstract]
Net sales	25.8	19.7	46.1	38.8
Reportable Segments [Member]
Segment Reporting Information [Abstract]
Net sales	463.8	464.7	901.5	896
Income from operations	48.7	65.7	111.5	130.3
Reportable Segments [Member] | Performance Materials [Member]
Segment Reporting Information [Abstract]
Net sales	215.4	214.5	414.6	401.8
Income from operations	20.7	29.6	47	55.8
Reportable Segments [Member] | Specialty Minerals [Member]
Segment Reporting Information [Abstract]
Net sales	145.1	150.9	289.5	300.5
Income from operations	20	25.1	42	49.2
Reportable Segments [Member] | Refractories [Member]
Segment Reporting Information [Abstract]
Net sales	77.5	79.6	151.3	154.9
Income from operations	7.1	10.3	19.2	23.1
Reportable Segments [Member] | Energy Services [Member]
Segment Reporting Information [Abstract]
Net sales	25.8	19.7	46.1	38.8
Income from operations	$ 0.9	$ 0.7	$ 3.3	$ 2.2

Segment and Related Informati_4

Segment and Related Information, Reconciliation of Operating Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Income from operations before provision (benefit) for taxes on income [Abstract]
Acquisition related transaction and integration costs	$ 0	$ (1)	$ 0	$ (1.4)
Consolidated income from operations	45.5	62.8	107.5	125.4
Non-operating deductions, net	(13.3)	(8.4)	(26.1)	(21.8)
Income from operations before tax and equity in earnings	32.2	54.4	81.4	103.6
Reportable Segments [Member]
Income from operations before provision (benefit) for taxes on income [Abstract]
Consolidated income from operations	48.7	65.7	111.5	130.3
Unallocated Corporate Expenses [Member]
Income from operations before provision (benefit) for taxes on income [Abstract]
Consolidated income from operations	$ (3.2)	$ (1.9)	$ (4)	$ (3.5)

Segment and Related Informati_5

Segment and Related Information, Sales By Product Category (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Revenue from External Customer [Abstract]
Net sales	$ 463.8	$ 464.7	$ 901.5	$ 896
Performance Materials [Member]
Revenue from External Customer [Abstract]
Net sales	215.4	214.5	414.6	401.8
Specialty Minerals [Member]
Revenue from External Customer [Abstract]
Net sales	145.1	150.9	289.5	300.5
Refractories [Member]
Revenue from External Customer [Abstract]
Net sales	77.5	79.6	151.3	154.9
Energy Services [Member]
Revenue from External Customer [Abstract]
Net sales	25.8	19.7	46.1	38.8
Metalcasting [Member] | Performance Materials [Member]
Revenue from External Customer [Abstract]
Net sales	75.8	88.8	149	168
Household, Personal Care and Specialty Products [Member] | Performance Materials [Member]
Revenue from External Customer [Abstract]
Net sales	69	58.6	143.9	107.3
Environmental Products [Member] | Performance Materials [Member]
Revenue from External Customer [Abstract]
Net sales	29	25.2	44.9	37.9
Building Materials [Member] | Performance Materials [Member]
Revenue from External Customer [Abstract]
Net sales	19.1	18	34.4	36.9
Basic Minerals [Member] | Performance Materials [Member]
Revenue from External Customer [Abstract]
Net sales	22.5	23.9	42.4	51.7
Paper PCC [Member] | Specialty Minerals [Member]
Revenue from External Customer [Abstract]
Net sales	90.2	94.5	181.7	191.5
Specialty PCC [Member] | Specialty Minerals [Member]
Revenue from External Customer [Abstract]
Net sales	17.3	17.3	35.4	34.3
Ground Calcium Carbonate [Member] | Specialty Minerals [Member]
Revenue from External Customer [Abstract]
Net sales	24.8	25.2	47.1	47.7
Talc [Member] | Specialty Minerals [Member]
Revenue from External Customer [Abstract]
Net sales	12.8	13.9	25.3	27
Refractory Products [Member] | Refractories [Member]
Revenue from External Customer [Abstract]
Net sales	61	66.7	123	129
Metallurgical Products [Member] | Refractories [Member]
Revenue from External Customer [Abstract]
Net sales	$ 16.5	$ 12.9	$ 28.3	$ 25.9