Ingevity (NGVT) 10-Q 1 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Entity Registrant Name	Ingevity Corp
Entity Central Index Key	1,653,477
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common stock, shares outstanding		41,968,680
Entity Emerging Growth Company	false
Entity Small Business	false

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 311.2	$ 264.1	$ 855	$ 742.9
Cost of sales	192.6	170.9	535.8	489.2
Gross profit	118.6	93.2	319.2	253.7
Selling, general and administrative expenses	34.5	26.2	96.5	78.5
Research and technical expenses	5.6	4.8	16.3	14.6
Separation costs	0	0.2	0	0.7
Restructuring and other (income) charges, net	0	0.1	(0.6)	3.5
Acquisition-related costs	0	4.1	4.3	4.1
Other (income) expense, net	2.5	(0.5)	2.7	0.9
Interest expense, net	7.9	3.2	21.8	9.3
Income (loss) before income taxes	68.1	55.1	178.2	142.1
Provision (benefit) for income taxes	16.4	16.7	38.5	44.9
Net income (loss)	51.7	38.4	139.7	97.2
Less: Net income (loss) attributable to noncontrolling interest	2.2	4.6	12.7	12.3
Net income (loss) attributable to Ingevity stockholders	$ 49.5	$ 33.8	$ 127	$ 84.9
Per share data
Basic earnings (loss) per share attributable to Ingevity Corporation (usd per share)	$ 1.18	$ 0.80	$ 3.02	$ 2.01
Diluted earnings (loss) per share attributable to Ingevity Corporation (usd per share)	$ 1.16	$ 0.79	$ 2.98	$ 2

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 51.7	$ 38.4	$ 139.7	$ 97.2
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(3.6)	2.4	(6.5)	6.2
Derivative instruments:
Unrealized gain (loss), net of tax provision (benefit) of $0.1, zero, $0.3, zero	0.1	(0.2)	0.8	(0.2)
Reclassifications of deferred derivative instruments (gain) loss, included in net income (loss), net of tax (provision) benefit of ($0.2), zero, ($0.2), zero	(0.3)	0.1	(0.5)	0.1
Reclassifications of deferred derivative instruments (gain) loss, included in net income (loss), net of tax (provision) benefit of ($0.2), zero, ($0.2), zero	(0.2)	(0.1)	0.3	(0.1)
Pension & Other postretirement benefits:
Reclassifications of net actuarial and other (gain) loss and amortization of prior service cost, included in net income, net of tax of zero for all periods	0	0	0.1	0
Total pension and other postretirement benefits, net of tax of zero for all periods	0	0	0.1	0
Other comprehensive income (loss), net of tax provision (benefit) of ($0.1), zero, $0.1, zero	(3.8)	2.3	(6.1)	6.1
Comprehensive income (loss)	47.9	40.7	133.6	103.3
Less: Comprehensive income (loss) attributable to noncontrolling interest	2.2	4.6	12.7	12.3
Comprehensive income (loss) attributable to Ingevity stockholders	$ 45.7	$ 36.1	$ 120.9	$ 91

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Unrealized tax (benefit) expense	$ 100,000	$ 0	$ 300,000	$ 0
Reclassifications tax expense (benefit)	(200,000)	0	(200,000)	0
Total derivative instruments tax (benefit) expense	(100,000)	0	100,000	0
Reclassifications tax expense (benefit)	0	0	0	0
Total pension and other postretirement benefits tax (benefit) expense	0	0	0	0
Other comprehensive income (loss) tax (benefit) expense	$ (100,000)	$ 0	$ 100,000	$ 0

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 57.5	$ 87.9
Accounts receivable, net of allowance of $0.3 million at September 30, 2018 and $0.4 million at December 31, 2017	140.4	100
Inventories, net	194.3	160
Prepaid and other current assets	28.6	20.8
Current assets	420.8	368.7
Property, plant and equipment, net	498.9	438.5
Goodwill	130.6	12.4
Other intangibles, net	129.2	4.9
Deferred income taxes	2.9	3.4
Restricted investment	70.7	71.3
Other assets	38.8	30.4
Total Assets	1,291.9	929.6
Liabilities
Accounts payable	108.7	83.1
Accrued expenses	26.2	20
Accrued payroll and employee benefits	32.5	39.2
Notes payable and current maturities of long-term debt	4.9	9.4
Income taxes payable	7.5	1.5
Current liabilities	179.8	153.2
Long-term debt including capital lease obligations	744	444
Deferred income taxes	31.2	41.3
Other liabilities	14.2	13.2
Total Liabilities	969.2	651.7
Commitments and contingencies (Note 15)
Equity
Preferred stock (par value $0.01 per share; 50,000,000 shares authorized; zero issued and outstanding at September 30, 2018 and December 31, 2017)	0	0
Common stock (par value $0.01 per share; 300,000,000 shares authorized; 42,322,153 and 42,208,973 issued; 41,992,323 and 42,089,103 outstanding at September 30, 2018 and December 31, 2017)	0.4	0.4
Additional paid-in capital	95.1	140.1
Retained earnings	271.4	142.8
Accumulated other comprehensive income (loss)	(17.8)	(11.7)
Treasury stock, common stock, at cost (329,830 shares at September 30, 2018; 119,870 shares at December 31, 2017)	(26.4)	(7.7)
Total Ingevity stockholders' equity	322.7	263.9
Noncontrolling interest	0	14
Total Equity	322.7	277.9
Total Liabilities and Equity	$ 1,291.9	$ 929.6

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 0.3	$ 0.4
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	50,000,000	50,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	300,000,000	300,000,000
Common stock, shares issued (shares)	42,322,153	42,208,973
Common stock shares outstanding (shares)	41,992,323	42,089,103
Treasury shares (in shares)	329,830	119,870

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Cash provided by (used in) operating activities:
Net income (loss)		$ 139.7	$ 97.2
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization		42.1	30.4
Deferred income taxes		3.2	(6)
Disposal/impairment of assets		0	1.1
Restructuring and other (income) charges, net		(0.6)	3.5
Share-based compensation		10.1	7.4
Pension and other postretirement expense		1.4	0.8
Other non-cash items		8.5	9.1
Changes in operating assets and liabilities:
Accounts receivable, net		(24.6)	(19.1)
Inventories, net		(30.3)	(1.4)
Prepaid and other currents assets		(4.7)	4.1
Planned major maintenance outage		(5.1)	(4.5)
Accounts payable		21.6	2.7
Accrued expenses		6.6	1.8
Accrued payroll and employee benefit costs		(6.5)	7
Income taxes		7.5	3.9
Pension contribution		(1.5)	0
Restructuring and other spending		(0.1)	(5.2)
Changes in other operating assets and liabilities, net		(0.9)	0.8
Net cash provided by (used in) operating activities		166.4	133.6
Cash provided by (used in) investing activities:
Capital expenditures		(56.6)	(36.2)
Payments for acquired businesses, net of cash acquired		(315.5)	0
Purchase of equity securities		0	(2.4)
Sale of equity securities		1.1	0.7
Other investing activities, net		(5.3)	(4.1)
Net cash provided by (used in) investing activities		(376.3)	(42)
Cash provided by (used in) financing activities:
Net borrowings under our revolving credit facility		0	(111.9)
Proceeds from long-term borrowings		300	75
Debt issuance costs		(7.1)	(1.3)
Proceeds and withholdings from share-based compensation plans, net		(2.1)	(0.9)
Proceeds and withholdings from share-based compensation plans, net		1.8	0
Repurchases of common stock under publicly announced plan		(18.1)	(2.6)
Acquisition of noncontrolling interest		(80)	0
Payments of Ordinary Dividends, Noncontrolling Interest		15.3	8.2
Other financing activities, net		0.7	0
Net cash provided by (used in) financing activities		179.9	(49.9)
Increase (decrease) in cash, cash equivalents and restricted cash		(30)	41.7
Effect of exchange rate changes on cash		(0.1)	(1.7)
Change in cash, cash equivalents and restricted cash		(30.1)	40
Cash, cash equivalents and restricted cash at beginning of period		87.9	30.5
Cash, cash equivalents and restricted cash at end of period	[1]	57.8	70.5
Supplemental cash flow information:
Cash paid for interest, net of capitalized interest		22.6	13.9
Cash paid for taxes, net of refunds		27.6	47.5
Purchases of property, plant and equipment in accounts payable		$ 8.7	$ 4.9
[1]	Includes restricted cash of $0.3 million and $0.3 million and cash and cash equivalents of $57.5 million and $70.2 million as of September 30, 2018 and 2017, respectively. Restricted cash is included within "Prepaid and Other Current Assets" within the condensed consolidated balance sheets.

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Statement of Cash Flows [Abstract]
Restricted cash and cash equivalents	$ 0.3	$ 0.3
Cash and cash equivalents	$ 57.5	$ 70.2

Background

Background	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background	Background Ingevity Corporation ("Ingevity," "the Company," "we," "us" or "our") is a leading global manufacturer of specialty chemicals and high performance activated carbon materials. We provide innovative solutions to meet our customers’ unique and demanding requirements through proprietary formulated products. We report in two business segments, Performance Materials and Performance Chemicals. Our Performance Materials segment consists of our automotive technologies and process purifications product lines. Performance Materials manufactures products in the form of powder, granular, extruded pellets or structured honeycombs and activated carbon sheets. Automotive technologies products are sold into the gasoline vapor emission control markets within the automotive industry while process purifications products are sold into the food, water, beverage, air emissions control, corrosion protection, odor reduction and chemical purification industries. Our Performance Chemicals segment consists of our pavement technologies, oilfield technologies and industrial specialties product lines. Performance Chemicals manufactures products derived from crude tall oil and lignin extracted from the kraft paper making process. Performance Chemicals products serve as critical inputs used in a variety of high performance applications, including asphalt paving (pavement technologies product line), oil exploration and production (oilfield technologies product line), printing inks, adhesives, agrochemicals, and lubricants (industrial specialties product line).

Basis of Consolidation and Pres

Basis of Consolidation and Presentation	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Consolidation and Presentation	Basis of Consolidation and Presentation In all periods presented within these Condensed Consolidated Financial Statements, all intercompany accounts and transactions have been eliminated. The Condensed Consolidated Financial Statements include the accounts of Ingevity and subsidiaries in which a controlling interest is maintained. If Ingevity's ownership is less than 100 percent, the outside stockholders' interests are shown as noncontrolling interest. In all periods presented, the noncontrolling interest reported within the Condensed Consolidated Financial Statements represents the 30 percent ownership interest held by a third party U.S.-based company in our consolidated Purification Cellutions LLC legal entity. Purification Cellutions LLC is the legal entity that owns the technology associated with, and manufactures, our structured honeycomb products within our Performance Materials segment. See Note 11 for information regarding our recent acquisition of the remaining 30 percent interest in Purification Cellutions, LLC on August 1, 2018. These Condensed Consolidated Financial Statements have not been audited. However, in the opinion of management, all normal recurring adjustments necessary to state fairly the financial position and the results of operations for the interim periods presented have been made. These Condensed Consolidated Financial Statements have been prepared on the basis of accounting principles and practices generally accepted in the United States (“GAAP”) applied consistently with those used in the preparation of the Annual Consolidated Financial Statements for the years ended December 31, 2017 , 2016 and 2015 , collectively referred to as the “Annual Consolidated Financial Statements” included in our Annual Report on Form 10-K for the year ended December 31, 2017 (the "2017 Annual Report"). Certain information and footnote disclosures normally included in our Annual Consolidated Financial Statements presented in accordance with GAAP have been condensed or omitted. The consolidated results of operations for interim periods are not necessarily indicative of the results to be expected for the full year. The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the Annual Consolidated Financial Statements and notes thereto included in the 2017 Annual Report. Certain prior year amounts have been reclassified to conform with the current year's presentation.

New accounting guidance

New accounting guidance	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
New accounting guidance	New accounting guidance In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-15 "Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40) Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract." This ASU requires companies to defer specific implementation costs incurred in a Cloud Computing Arrangement ("CCA") that are often expensed as incurred under current GAAP, and recognize the expense over the noncancellable term of the CCA. The new standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Although we are still evaluating the impact of this new standard, we do not believe that the adoption will materially impact our Condensed Consolidated Financial Statements and related disclosures. In August 2018, the FASB issued ASU 2018-13 "Fair Value Measurement (Topic 820) Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement." This ASU eliminates, amends, and adds disclosure requirements for fair value measurements. The new standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Although we are still evaluating the impact of this new standard, we do not believe that the adoption will materially impact our Condensed Consolidated Financial Statements and related disclosures. In June 2018, the FASB issued ASU 2018-07 "Compensation-Stock Compensation (Topic 718) - Improvements to Nonemployee Share-Based Payment Accounting." This ASU provides for a single accounting model for all share-based payments, with the employee based guidance now applying to nonemployee share-based transactions. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Although we are still evaluating the impact of this new standard, we do not believe that the adoption will materially impact our Condensed Consolidated Financial Statements and related disclosures. In February 2018, the FASB issued ASU 2018-02 "Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from AOCI." This ASU provides for the reclassification of the effect of remeasuring deferred tax balances related to items within accumulated other comprehensive income to retained earnings resulting from the provisions of the December 22, 2017 U.S. Tax Cuts and Jobs Act (the "U.S. Tax Reform"). We early adopted this new ASU in the fourth quarter of 2017, and as a result, we reclassified $0.3 million from AOCI to retained earnings. In August 2017, the FASB issued ASU 2017-12 "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" that amends the hedge accounting recognition and presentation requirements under hedge accounting. The new standard will make more financial and non-financial hedging strategies eligible for hedge accounting, amends the presentation and disclosure requirements, and simplifies how companies assess effectiveness. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those years. We early adopted this new ASU during the fourth quarter of 2017. The impact of adoption did not have a material effect on our Condensed Consolidated Financial Statements and related disclosures. In January 2017, the FASB issued ASU 2017-04 "Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment," which amends and simplifies the accounting standard for goodwill impairment. The new standard removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount a reporting unit’s carrying value exceeds its fair value, limited to the total amount of goodwill allocated to that reporting unit. The new standard is effective for annual and any interim impairment tests for periods beginning after December 15, 2019. The Company early adopted this standard on January 1, 2018. The impact of adoption did not have a material impact on our Condensed Consolidated Financial Statements and related disclosures. In January 2017, the FASB issued ASU No. 2017-01 "Business Combinations (Topic 805): Clarifying the Definition of a Business." The new guidance narrows the existing definition of a business and provides a framework for evaluating whether a transaction should be accounted for as an acquisition (or disposal) of assets or a business. The guidance requires an entity to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the set of transferred assets and activities (collectively, the "set") is not a business. To be considered a business, the set would need to include an input and a substantive process that together significantly contribute to the ability to create outputs, as defined by the ASU. The guidance is effective for annual reporting periods beginning after December 15, 2017, including interim periods within those annual reporting periods, and should be applied prospectively. We adopted this standard on January 1, 2018. We have utilized this new guidance in our accounting for the Georgia Pacific's Pine Chemical Business acquisition; refer to Note 4 for more information. In August 2016, the FASB issued final amendments to clarify how entities should classify certain cash receipts and cash payments in ASU 2016-15 "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." The new guidance clarifies the classification on the statement of cash flows of certain cash receipts and disbursements such as distributions received from equity method investees, proceeds from settlement of insurance claims, and proceeds from the settlement of corporate-owned life insurance policies. The new standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those years. The Company adopted this standard on January 1, 2018. The impact of adoption did not have a material impact on our Condensed Consolidated Financial Statements and related disclosures. In February 2016, the FASB issued ASU 2016-02 "Leases (Topic 842)." Under the new guidance, lessees will be required to recognize for all leases (with the exception of short-term leases) a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. We expect to adopt these provisions on January 1, 2019, including interim periods subsequent to the adoption date, which can be applied using a full retrospective or modified retrospective approach. Since the issuance of ASU 2016-02, the FASB has issued several amendments which clarify certain points in Topic 842, including ASU 2018-01 ("Land Easement Practical Expedient"), ASU 2018-10 ("Codification Improvements"), and ASU 2018-11 ("Targeted Improvements"). We anticipate adopting all of these standards at the same time effective January 1, 2019. Based upon the results of our initial assessment thus far, we plan to adopt this new standard under the modified retrospective approach, utilizing the practical expedients upon transition that will retain lease classification and initial direct costs for any leases that exist prior to adoption of the standard. We are in the process of cataloging our existing lease contracts and implementing changes to our systems. As a lessee, the majority of our leases under existing guidance are classified as operating leases, and therefore, not recorded on the balance sheet but are recorded in the statement of earnings as expense as incurred. Upon adoption of the new guidance, we will be required to record the vast majority of these operating leases on the balance sheet as a right-of-use asset and a lease liability. The timing of expense recognition and classification in the statement of earnings could change based on the classification of leases as either operating or financing; however, we have not completed our evaluation to determine to what extent. In May 2014, the FASB issued ASU 2014-09 “Revenue from Contracts with Customers (Topic 606),” which supersedes both the revenue recognition requirement to Accounting Standards Codification ("ASC") 605 “Revenue Recognition” and most industry-specific guidance. The core principle of the new standard (ASC 606) is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. An entity must also disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. In 2016 and 2017, the FASB issued several ASUs that provided additional clarity on numerous topics as well as providing technical corrections to the original ASU 2014-09. We adopted this new standard on January 1, 2018, utilizing the modified retrospective method applied to those contracts that were not completed as of January 1, 2018. See below for the effect of this adoption on our Condensed Consolidated Financial Statements. The majority of our sales revenue remains unchanged by ASC 606 and continues to be recognized when products are shipped from our manufacturing and warehousing facilities, which represents the point at which control is transferred to the customer. For certain limited contracts, where we are producing goods with no alternative use and for which we have an enforceable right to payment for performance completed to date, we are recognizing revenue as goods are manufactured, rather than when they are shipped as previously done under ASC 605. The cumulative effect of the changes made to our condensed consolidated balance sheet on January 1, 2018, due to the adoption of ASC 606, were as follows: In millions Balance at December 31, 2017 Adjustments Balance at January 1, 2018 Assets Accounts receivable, net of allowance $ 100.0 $ 0.3 $ 100.3 Inventories, net 160.0 (2.4 ) 157.6 Prepaid and other current assets 20.8 5.1 25.9 Liabilities Accrued expenses 20.0 0.9 20.9 Deferred income taxes 41.3 0.5 41.8 Equity Retained earnings $ 142.8 $ 1.6 $ 144.4 In accordance with ASC 606, the impact of adoption on our condensed consolidated statement of operations and balance sheet were as follows: Three Months Ended September 30, 2018 In millions As reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Net sales $ 311.2 $ 311.4 $ (0.2 ) Cost of sales 192.6 192.8 (0.2 ) Provision (benefit) for income taxes 16.4 16.4 — Net income (loss) $ 51.7 $ 51.7 $ — Nine Months Ended September 30, 2018 In millions As reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Net sales $ 855.0 $ 854.7 $ 0.3 Cost of sales 535.8 536.1 (0.3 ) Provision (benefit) for income taxes 38.5 38.4 0.1 Net income (loss) $ 139.7 $ 139.2 $ 0.5 September 30, 2018 In millions As reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Assets Accounts receivable, net of allowance $ 140.4 $ 140.0 $ 0.4 Inventories, net 194.3 196.5 (2.2 ) Prepaid and other current assets 28.6 23.1 5.5 Liabilities Accrued expenses 26.2 25.1 1.1 Deferred income taxes 31.2 31.1 0.1 Equity Retained earnings $ 271.4 $ 268.9 $ 2.5 All other issued but not yet effective accounting pronouncements are not expected to have a material impact on our Condensed Consolidated Financial Statements.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Acquisition	Acquisition Georgia Pacific's Pine Chemical Business On August 22, 2017, we entered into an Asset Purchase Agreement (the "Purchase Agreement") with Georgia-Pacific Chemicals LLC, Georgia-Pacific LLC (together with Georgia-Pacific Chemicals LLC, "GP") and Ingevity Arkansas, LLC, a wholly-owned subsidiary of Ingevity, to purchase substantially all the assets primarily used in GP's pine chemical business (the "Pine Chemical Business"), including assets and facilities related to tall oil fractionation operations and the production or modification of tall oil fatty acids, tall oil rosins, rosin derivatives and formulated products (the "Acquisition"). On March 8, 2018 (the "Acquisition Date"), pursuant to the terms and conditions set forth in the Purchase Agreement, we completed the Acquisition. During the three months ended September 30, 2018, we finalized the purchase price which included a final adjustment for working capital resulting in an aggregate purchase price of $315.5 million . The Acquisition was primarily funded with the net proceeds from the $300.0 million senior notes issued on January 24, 2018. See Note 10 for more information on the senior notes. In addition, on the Acquisition Date, the Company and GP entered into a 20 -year, market-based crude tall oil ("CTO") supply contract with certain of Georgia-Pacific’s paper mill operations. The Acquisition is being integrated into our Performance Chemicals segment and has been included within our results of operations since the Acquisition Date. Although not yet complete, a substantial portion of the Pine Chemical Business has been integrated into our existing Performance Chemicals operations. As a result, our ability to separate net sales and operating performance of the Acquisition from our existing Performance Chemicals' operating results is no longer practicable. Purchase Price Allocation The Acquisition has been accounted for under the business combinations accounting guidance, and as such we have applied acquisition accounting. Acquisition accounting requires, among other things, that assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. The aggregate purchase price noted above was allocated to the major categories of assets acquired and liabilities assumed based upon their estimated fair values at the Acquisition Date using primarily Level 2 and Level 3 inputs. These Level 2 and Level 3 valuation inputs include an estimate of future cash flows and discount rates. Additionally, estimated fair values are based, in part, upon outside appraisals for certain assets, including specifically-identified intangible assets. The following table summarizes the consideration paid for the Acquisition and the amounts of the assets acquired and liabilities assumed as of the Acquisition Date. Purchase Price Allocation In millions Weighted Average Amortization Period Fair Value Accounts receivable $ 16.2 Inventories (1) 9.4 Property, plant and equipment 39.3 Intangible assets (2) Patents 12 years 1.9 Non-compete agreement 3 years 2.2 Customer relationships 11 years 129.0 Goodwill (3) 118.7 Other assets 0.1 Total fair value of assets acquired 316.8 Accounts payable 0.8 Accrued expenses 0.5 Total fair value of liabilities assumed $ 1.3 Total cash paid $ 315.5 _______________ (1) Fair value of finished good inventories acquired included a step-up in the value of approximately $1.4 million, of which zero and $1.4 million was expensed in the three and nine months ended September 30, 2018, respectively. The expense is included in "Cost of sales" on the condensed consolidated statement of operations. (2) The aggregate amortization expense was $3.2 million and $7.4 million for the three and nine months ended September 30, 2018, respectively. Estimated amortization expense is as follows: 2018 - $10.6 million, 2019 - $12.7 million, 2020 - $12.7 million, 2021 - $12.0 million, and 2022 - $11.8 million. (3) Goodwill largely consists of expected cost synergies and economies of scale resulting from the business combination. We expect the full amount to be deductible for income tax purposes. Unaudited Pro Forma Financial Information The following unaudited pro forma results of operations assume that the Acquisition occurred at the beginning of the periods presented. These unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations would have been if the Acquisition had occurred at the beginning of the periods presented, nor are they indicative of future results of operations. The pro forma results presented below are adjusted for the removal of Acquisition and other related costs of zero and $5.7 million for the three and nine months ended September 30, 2018 , respectively, and of $4.1 million for both the three and nine months ended September 30, 2017 . Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Net sales $ 311.2 $ 288.1 $ 875.2 $ 814.5 Income (loss) before income taxes 68.1 58.8 184.7 141.3 Diluted earnings (loss) per share attributable to Ingevity stockholders $ 1.16 $ 0.85 $ 3.10 $ 1.99 Acquisition-related costs Costs incurred to complete and integrate the Acquisition into our Performance Chemicals segment are expensed as incurred and recorded to Acquisition-related costs on our condensed consolidated statement of operations. During the three and nine months ended September 30, 2018 , zero and $4.3 million , respectively of Acquisition-related costs were recognized. Acquisition-related costs incurred in both the three and nine months ended September 30, 2017 were $4.1 million . These costs represent transaction costs, legal fees and professional third-party service fees.

Revenues

Revenues	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenues	Revenues On January 1, 2018, we adopted ASC 606 using the modified retrospective method applied to contracts not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting under ASC 605. See Note 3 for more information on the adoption of ASC 606 and its impact on our Condensed Consolidated Financial Statements. Ingevity's operating segments are (i) Performance Materials and (ii) Performance Chemicals. Our Performance Materials segment consists of our automotive technologies and process purifications product lines. Performance Materials manufactures products in the form of powder, granular, extruded pellets or structured honeycombs and activated carbon sheets. Automotive technologies products are sold into the gasoline vapor emission control markets within the automotive industry while process purifications products are sold into the food, water, beverage, air emissions control, corrosion protection, odor reduction and chemical purification industries. Our Performance Chemicals segment consists of our pavement technologies, oilfield technologies and industrial specialties product lines. Performance Chemicals manufactures products derived from crude tall oil and lignin extracted from the kraft paper making process. Performance Chemicals products serve as critical inputs used in a variety of high performance applications, including asphalt paving (pavement technologies product line), oil exploration and production (oilfield technologies product line), printing inks, adhesives, agrochemicals, and lubricants (industrial specialties product line). Net sales in both of our reportable segments are based on the sale of manufactured products. Net sales are recognized when obligations under the terms of a contract with our customer are satisfied; generally, this occurs with the transfer of control of our products. Since net sales are derived from product sales only, we have disaggregated our net sales by our product lines within each reportable segment. Net sales are measured as the amount of consideration we expect to receive in exchange for transferring goods. Sales, value add, and other taxes we collect concurrent with revenue-producing activities are excluded from revenue. Sales returns and allowances are not a normal practice in the industry and are not significant. Shipping and handling fees billed to customers continue to be included with Net sales. Certain customers may receive cash-based incentives, including discounts and volume rebates, which are accounted for as variable consideration and included in Net sales. Incidental items immaterial in the context of the contract are recognized as expense. If we pay for the freight and shipping, we recognize the cost when control of the product has transferred to the customer as an expense in Cost of sales on the condensed consolidated statement of operations. Although very rare, from time to time we incur expenses to obtain a sales contract. In these cases, if these costs are for orders that are fulfilled in one year or less, we expense these costs as they are incurred. Because the period between when we transfer a contracted good to a customer and when the customer pays for that good will be one year or less, we elect not to adjust the contracted amount of consideration for the effects of any significant financing component. Disaggregation of Revenue The following tables present our Net sales disaggregated by product line and geography. In millions Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 Automotive Technologies product line $ 86.6 $ 258.6 Process Purification product line 9.7 29.3 Performance Materials segment $ 96.3 $ 287.9 Oilfield Technologies product line 32.5 84.0 Pavement Technologies product line 68.1 152.2 Industrial Specialties product line 114.3 330.9 Performance Chemicals segment $ 214.9 $ 567.1 Consolidated Net sales $ 311.2 $ 855.0 The following table presents our Net sales disaggregated by geography, based on the delivery address of our customer. In millions Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 North America $ 220.6 $ 587.3 Asia Pacific 45.0 121.9 Europe, Middle East and Africa 40.5 128.8 South America 5.1 17.0 Consolidated Net sales $ 311.2 $ 855.0 Contract Balances The following table provides information about contract assets and contract liabilities from contracts with customers. The contract assets primarily relate to our rights to consideration for products produced but not billed at the reporting date on contracts with certain customers. The contract assets are recognized as accounts receivables when the rights become unconditional and the customer has been billed. Contract liabilities represent obligations to transfer goods to a customer for which we have received consideration from our customer. For all periods presented we had no contract liabilities. In millions Contract Asset Balance at January 1, 2018 $ 4.4 Contract asset additions 12.3 Reclassification to accounts receivable, billed to customers (11.9 ) Balance at September 30, 2018 (1) $ 4.8 _______________ (1) Included within "Prepaid and other current assets" on the condensed consolidated balance sheet.

Financial Instruments, Risk Man

Financial Instruments, Risk Management, and Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Financial Instruments, Risk Management, and Fair Value Measurements	Financial Instruments, Risk Management, and Fair Value Measurements Financial Instruments and Risk Management Ingevity’s operations are exposed to market risks, such as changes in foreign currency exchange rates and commodity prices due to transactions denominated in a variety of foreign currencies and purchases of certain commoditized raw materials and inputs. Changes in these rates and prices may have an impact on Ingevity’s future cash flow and earnings. To mitigate these market risks and their effects, we enter into derivative financial instruments from time to time, which are governed by policies, procedures and internal processes set forth by our Board of Directors. Our risk management program also addresses counterparty credit risk by entering into derivative financial instruments with only major financial institutions with investment grade ratings. Once the derivative financial instrument is entered into, we continuously monitor the financial institutions’ credit ratings and our credit risk exposure held by the financial institution. When appropriate, we reallocate exposures across multiple financial institutions to limit credit risk. If a counterparty fails to fulfill its performance obligations under the derivative financial instrument, then Ingevity is exposed to credit risk equal to the fair value of the financial instrument. Derivative assets and liabilities are reported on a net basis by counterparty, to the extent governed by master netting agreements, in the condensed consolidated balance sheets. Due to our proactive mitigation of these potential credit risks, we anticipate performance by our counterparties to these contracts and therefore no material loss is expected. Foreign Currency Exchange Risk Management We manufacture and sell our products in several countries throughout the world and, thus, we are exposed to changes in foreign currency exchange rates. To manage the volatility relating to these exposures, we net the exposures on a consolidated basis to take advantage of natural offsets. To manage the remaining exposure, from time to time, we utilize foreign currency exchange forward contracts to minimize the volatility to earnings and cash flows resulting from the effect of fluctuating foreign currency exchange rates on export sales denominated in foreign currencies (principally the euro). These contracts are generally designated as cash flow hedges. We began our foreign currency exchange risk hedging program in July 2017. As of September 30, 2018 , open foreign currency derivative contracts hedge forecasted transactions until December 2018. These open derivative contracts hedge the notional U.S. dollar equivalent value of approximately $7.5 million . The fair value of the foreign currency hedge was a $0.5 million asset and zero at September 30, 2018 and December 31, 2017 , respectively. Commodity Price Risk Management Certain energy sources used by the Company, are subject to price volatility caused by weather, supply and demand conditions, economic variables and other unpredictable factors. This volatility is primarily related to the market pricing of natural gas. To mitigate expected fluctuations in market prices and the volatility to earnings and cash flow resulting from changes to pricing of natural gas purchases, from time to time, we will enter into swap contracts and zero cost collar option contracts and designate these contracts as cash flow hedges. We began our commodity price risk hedging program in December 2017 and therefore prior to this date we had no derivative financial instruments designated to hedge commodity price risk. As of September 30, 2018 , we had 1.3 million and 1.6 million mmBTUS (millions of British Thermal Units) in aggregate notional volume of outstanding natural gas commodity swap contracts and zero cost collar option contracts, respectively, designated as cash flow hedges. As of September 30, 2018 , open commodity contracts hedge forecasted transactions until December 2019. The fair value of the outstanding designated natural gas commodity hedge contracts as of September 30, 2018 and December 31, 2017 was $0.1 million asset and less than $0.1 million asset, respectively. Equity Securities Our investments in equity securities with a readily determinable fair value totaled $0.5 million at September 30, 2018 and $1.8 million at December 31, 2017. The net realized gain/(loss) and unrealized gain/(loss) recognized during the three months ended September 30, 2018 was zero and zero , respectively. The net realized gain/(loss) and unrealized gain/(loss) recognized during the nine months ended September 30, 2018, was of zero and $(0.1) million , respectively. The aggregate carrying value of investments in equity securities where fair value is not readily determinable totaled $1.5 million as of September 30, 2018 and $3.0 million as of December 31, 2017. During the three months ended September 30, 2018, we recorded an impairment charge of $1.5 million to an equity security where fair value is not readily determinable held within our Performance Materials segment. The charge was based on recently updated expected future cash flow projections for the investment. Fair-Value Measurements We have categorized our assets and liabilities that are recorded at fair value, based on the priority of the inputs to the valuation technique, into a three-level fair-value hierarchy. The fair-value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the assets and liabilities fall within different levels of the hierarchy, the categorization is based on the lowest level input that is significant to the fair-value measurement of the instrument. The following information is presented for assets and liabilities that are recorded in the condensed consolidated balance sheets at fair value measured on a recurring basis. There were no transfers of assets and liabilities that are recorded at fair value between Level 1 and Level 2 during the period reported. There were no non-recurring fair value measurements in the condensed consolidated balance sheets as of September 30, 2018 or December 31, 2017 . In millions Level 1 (1) Level 2 (2) Level 3 (3) Total September 30, 2018 Assets: Equity securities (4) $ 0.5 $ — $ — $ 0.5 Foreign currency hedging (4) — 0.5 — 0.5 Commodity hedging (4) — 0.1 — 0.1 Deferred compensation plan investments (5) 2.3 — — 2.3 Total assets $ 2.8 $ 0.6 $ — $ 3.4 Liabilities: Deferred compensation arrangement (5) $ 4.5 $ — $ — $ 4.5 Separation-related reimbursement awards (6) 0.3 — — 0.3 Total liabilities $ 4.8 $ — $ — $ 4.8 December 31, 2017 Assets: Equity securities (4) $ 1.8 $ — $ — $ 1.8 Total assets $ 1.8 $ — $ — $ 1.8 Liabilities: Deferred compensation arrangement (5) $ 2.0 $ — $ — $ 2.0 Separation-related reimbursement awards (6) 0.9 — — 0.9 Total liabilities $ 2.9 $ — $ — $ 2.9 ______________ (1) Quoted prices in active markets for identical assets. (2) Quoted prices for similar assets and liabilities in active markets. (3) Significant unobservable inputs. (4) Represents securities with readily determinable fair value. Securities are included within "Prepaid and other current assets" on the condensed consolidated balance sheet. (5) Consists of a deferred compensation arrangement, through which we hold various investment securities, recognized on our balance sheets. Both the asset and liability are recorded at fair value, and are included within "Other assets" and "Other liabilities" on the condensed consolidated balance sheets, respectively. (6) Included within "Accrued expenses" on the condensed consolidated balance sheet. The expense recognized during the three and nine months ended September 30, 2018 , was $0.1 million and zero , and during the three and nine months ended September 30, 2017 , was zero and $0.3 million , respectively. At September 30, 2018 , the book value of capital lease obligations was $80.0 million and the fair value was $88.4 million . The fair value of our capital lease obligations is based on the period-end quoted market prices for the obligations, using Level 2 inputs. The carrying amount, excluding debt issuance fees, of our variable interest rate long-term debt is $370.3 million as of September 30, 2018 . The carrying value is a reasonable estimate of the fair value of the outstanding debt based on the variable interest rate of the debt. At September 30, 2018 , the book value of our fixed rate debt, the senior notes issued January 24, 2018, was $300.0 million , and the fair value was $286.3 million , based on Level 2 inputs. At September 30, 2018 , the book value of our Restricted investment was $70.7 million , and the fair value was $66.4 million , based on Level 1 inputs. The carrying value of our financial instruments: cash and cash equivalents, other receivables, other payables and accrued liabilities approximate their fair values due to the short-term nature of these financial instruments.

Inventories, net

Inventories, net	9 Months Ended
	Sep. 30, 2018
Inventory Disclosure [Abstract]
Inventories, net	Inventories, net In millions September 30, 2018 December 31, 2017 Raw materials $ 40.8 $ 40.1 Production materials, stores and supplies 16.8 13.4 Finished and in-process goods 145.2 114.3 Subtotal 202.8 167.8 Less: excess of cost over LIFO cost (8.5 ) (7.8 ) Inventories, net $ 194.3 $ 160.0

Property, plant and equipment,

Property, plant and equipment, net	9 Months Ended
	Sep. 30, 2018
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net	Property, plant and equipment, net In millions September 30, 2018 December 31, 2017 Machinery and equipment $ 835.2 $ 792.5 Buildings and leasehold equipment 112.2 115.0 Land and land improvements 19.6 18.0 Construction in progress 70.1 35.8 Total cost 1,037.1 961.3 Less: accumulated depreciation (538.2 ) (522.8 ) Property, plant and equipment, net $ 498.9 $ 438.5

Goodwill and other intangible a

Goodwill and other intangible assets, net	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and other intangible assets	Goodwill and other intangible assets, net Operating Segments In millions Performance Chemicals Performance Materials Total December 31, 2017 $ 8.1 $ 4.3 $ 12.4 Acquisitions (1) 118.7 — 118.7 Foreign currency translation (0.5 ) — (0.5 ) September 30, 2018 $ 126.3 $ 4.3 $ 130.6 _______________ (1) See Note 4 for more information. nine months ended September 30, 2018 . All of our other intangible assets, net are related to the Performance Chemicals operating segment. The following table summarizes intangible assets: September 30, 2018 December 31, 2017 In millions Gross carrying amount Accumulated amortization Net Gross carrying amount Accumulated amortization Net Brands (1) $ 13.9 $ 12.2 $ 1.7 $ 13.9 $ 11.8 $ 2.1 Patents (2) 1.9 0.2 1.7 — — — Customer contracts and relationships (2) 157.2 33.2 124.0 28.2 25.4 2.8 Non-compete agreements (2) 2.2 0.4 1.8 — — — Other intangibles, net $ 175.2 $ 46.0 $ 129.2 $ 42.1 $ 37.2 $ 4.9 _______________ (1) Represents trademarks, trade names and know-how. (2) See Note 4 for more information. The amortization expense related to our intangible assets in the table above is shown in the table below. Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Cost of sales $ 0.2 $ 0.3 $ 0.6 $ 1.0 Selling, general and administrative expenses 3.4 0.3 8.2 0.9 Total amortization expense $ 3.6 $ 0.6 $ 8.8 $ 1.9 Based on the current carrying values of intangible assets, estimated pre-tax amortization expense for the next five years is as follows: 2018 - $12.3 million , 2019 - $14.3 million , 2020 - $13.2 million , 2021 - $12.3 million and 2022 - $12.2 million .

Debt including capital lease ob

Debt including capital lease obligations	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Debt including capital lease obligations	Debt including capital lease obligations Current and long-term debt including capital lease obligations consisted of the following: September 30, 2018 In millions, except percentages Interest rate Maturity date September 30, 2018 December 31, 2017 Revolving credit facility (1) 3.51% 2023 $ — $ — Term loan facility 3.49% 2023 375.0 375.0 Senior notes 4.50% 2026 300.0 — Capital lease obligations 7.67% 2027 80.0 80.0 Other 5.09% 2018-2021 0.7 — Total debt including capital lease obligations 755.7 455.0 Less: debt issuance costs 6.8 1.6 Total debt including capital lease obligations, net of debt issuance costs 748.9 453.4 Less: debt maturing within one year (2) 4.9 9.4 Long-term debt including capital lease obligations $ 744.0 $ 444.0 ______________ (1) Letters of credit outstanding under the revolving credit facility were $1.8 million and available funds under the facility were $748.2 million at September 30, 2018 . (2) Debt maturing within one year is included in "Notes payable and current maturities of long-term debt" on the condensed consolidated balance sheets. Revolving Credit and Term Loan Facility Amendment On August 7, 2018, we entered into an Incremental Facility Agreement and Amendment No. 2 (the “Amendment”) to the Credit Agreement, dated as of March 7, 2016 (the “Existing Credit Agreement”, and as amended, supplemented or otherwise modified from time to time, including pursuant to the Incremental Facility Agreement and Amendment No. 1, dated as of August 21, 2017, and the Amendment, the “Amended Credit Agreement”). Among other things, the Amendment (i) increased the revolving commitments under the Existing Credit Agreement by $200.0 million (the “Incremental Revolving Commitments”) and (ii) reduced the Applicable Rate (as defined in the Amended Credit Agreement). The Amendment also extended the maturity date for the loans and commitments under the Existing Credit Agreement to August 7, 2023. The Incremental Revolving Commitments have terms identical to those of the Revolving Commitments under the Existing Credit Agreement and will be treated as a single class with such existing commitments under the Amended Credit Agreement. Loans under the Amended Credit Agreement bear interest at either (a) an adjusted base rate or (b) an adjusted LIBOR rate, in each case, plus an applicable margin (the “Applicable Margin”), in the case of base rate loans, ranging between 0.00 percent and 0.75 percent , and in the case of adjusted LIBOR rate loans, ranging between 1.00 percent and 1.75 percent . The Applicable Margin is based on a total leverage based pricing grid. Fees to revolving lenders under the Amended Credit Agreement, including fees in respect of the Incremental Revolving Commitments, include (i) commitment fees, based on a percentage of the daily unused portions of the facility, ranging from 0.15 percent to 0.30 percent and (ii) customary letter of credit fees. As consideration for the Amendment, the Company paid to each lender under the Existing Credit Agreement a consent fee equal to 0.05 percent of the aggregate principal amount of the commitments and outstanding loans held by such lender immediately prior to the Closing Date. Fees of $1.4 million were incurred to secure the Amended Credit Agreement. These fees have been deferred and will be amortized over the term of the arrangement. The credit facilities under the Amended Credit Agreement will mature on August 7, 2023. The Initial Term Loans and the Incremental Term A Loans (each, as defined in the Amended Credit Agreement) will amortize at a rate equal to 1.25 percent per quarter starting in September 2019, with the balance due at maturity. 2018 Senior Notes On January 24, 2018, we issued $300.0 million aggregate principal amount of 4.50 percent senior unsecured notes due 2026 (the “Notes”). The Notes were issued pursuant to an indenture dated as of January 24, 2018 (the “Indenture”), by and among Ingevity, the subsidiary guarantors party thereto and U.S. Bank National Association, as trustee. The Notes were offered and sold only to qualified institutional buyers pursuant to Rule 144A and to certain non-U.S. persons in transactions outside the United States pursuant to Regulation S under the Securities Act of 1933, as amended (the “Securities Act”). The Notes have not been registered under the Securities Act or any state securities laws and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable state laws. The net proceeds from the sale of the Notes, after deducting deferred issuance costs of $5.7 million , were approximately $294.3 million . We used the net proceeds from the sale of the Notes to finance, in part, our purchase of substantially all the assets primarily used in the pine chemical business of Georgia-Pacific Chemicals LLC and Georgia-Pacific LLC. Interest payments on the Notes are due semiannually in arrears on February 1st and August 1st of each year, beginning on August 1, 2018, at a rate of 4.50 percent per year. The Notes will mature on February 1, 2026. Financial Covenants The Indenture contains certain customary covenants (including covenants limiting Ingevity's and its restricted subsidiaries’ ability to grant or permit liens on certain property securing debt, declare or pay dividends, make distributions on or repurchase or redeem capital stock, make investments in unrestricted subsidiaries, engage in sale and lease-back transactions, and engage in a consolidation or merger, or sell, transfer or otherwise dispose of all or substantially all of the assets of our and our restricted subsidiaries, taken as a whole) and events of default (subject in certain cases to customary exceptions, as well as grace and cure periods). The occurrence of an event of default under the Indenture could result in the acceleration of the Notes and could cause a cross-default that could result in the acceleration of other indebtedness of Ingevity and its subsidiaries. The revolving credit facility and term loan facility include financial covenants requiring Ingevity to maintain on a consolidated basis a maximum total leverage ratio of 4.00 to 1.00 (which may be increased to 4.50 to 1.00 under certain circumstances) and a minimum interest coverage ratio of 3.00 to 1.00. We were in compliance with all covenants at September 30, 2018 .

Equity

Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Equity	Equity Ingevity Stockholders' Equity Common Stock Additional paid in capital Retained earnings Accumulated other comprehensive income (loss) Treasury stock Total In millions, except per share data Shares Amount Balance at December 31, 2017 42,209 $ 0.4 $ 140.1 $ 142.8 $ (11.7 ) $ (7.7 ) $ 263.9 Net income (loss) — — — 127.0 — — 127.0 Other comprehensive income (loss) — — — — (6.1 ) — (6.1 ) Common stock issued 107 — — — — — — Exercise of stock options, net 6 — 0.2 — — — 0.2 Tax payments related to vested restricted stock units — — — — — (2.1 ) (2.1 ) Share repurchase program — — — — — (18.1 ) (18.1 ) Share-based compensation plans — — 10.0 — — 1.5 11.5 Adoption of ASC 606 — — — 1.6 — — 1.6 Acquisition of noncontrolling interest — — (55.2 ) — — — (55.2 ) Balance at September 30, 2018 42,322 $ 0.4 $ 95.1 $ 271.4 $ (17.8 ) $ (26.4 ) $ 322.7 Noncontrolling Interest In millions 2018 2017 Balance at December 31, $ 14.0 $ 7.6 Net income (loss) attributable to noncontrolling interests 12.7 12.3 Noncontrolling interest distributions (15.3 ) (8.2 ) Acquisition of noncontrolling interest $ (11.4 ) $ — Balance at September 30, $ — $ 11.7 Ingevity Stockholders' Equity Common Stock Additional paid in capital Retained earnings Accumulated other comprehensive income (loss) Treasury stock Total In millions, except per share data Shares Amount Balance at June 30, 2018 42,309 $ 0.4 $ 146.9 $ 221.9 $ (14.0 ) $ (17.2 ) $ 338.0 Net income (loss) — — — 49.5 — — 49.5 Other comprehensive income (loss) — — — — (3.8 ) — (3.8 ) Common stock issued 13 — — — — — — Exercise of stock options, net — — — — — — — Tax payments related to vested restricted stock units — — — — — (0.6 ) (0.6 ) Share repurchase program — — — — — (9.0 ) (9.0 ) Share-based compensation plans — — 3.4 — — 0.4 3.8 Adoption of ASC 606 — — — — — — — Acquisition of noncontrolling interest — $ — $ (55.2 ) $ — $ — $ — $ (55.2 ) Balance at September 30, 2018 42,322 $ 0.4 $ 95.1 $ 271.4 $ (17.8 ) $ (26.4 ) $ 322.7 Noncontrolling Interest In millions 2018 2017 Balance at June 30, $ 11.3 $ 10.5 Net income (loss) attributable to noncontrolling interests 2.2 4.6 Noncontrolling interest distributions (2.1 ) (3.4 ) Acquisition of noncontrolling interest $ (11.4 ) $ — Balance at September 30, $ — $ 11.7 Noncontrolling interest acquisition On August 1, 2018, we completed the acquisition of the remaining 30 percent noncontrolling interest in Purification Cellutions LLC, which was treated as a partnership for tax purposes, for a purchase price of $80.0 million . The acquisition resulted in the elimination of Noncontrolling interest ( $11.4 million ) and the recognition of a Deferred tax asset ( $13.4 million ), with the remainder being recorded against Additional paid in capital ( $55.2 million ) in our Condensed Consolidated Financial Statements. Share Repurchases On February 20, 2017, our Board of Directors authorized the repurchase of up to $100 million of our common stock. The repurchase program does not include a specific timetable or price targets and may be suspended or terminated at any time. Share repurchases may be made from time to time in either open market or private transactions. The repurchase program does not require us to acquire any specific number of shares, and the program may be suspended or discontinued at any time. The timing, volume and nature of share repurchases will be at the discretion of management, depending on market conditions, alternative options for the use of cash, applicable securities laws and other factors. During the three months ended September 30, 2018 , we repurchased 93,900 shares of our common stock at a weighted average cost per share of $96.01 . During the nine months ended September 30, 2018 , we repurchased 211,000 shares of our common stock at a weighed average cost per share of $85.89 . At September 30, 2018 , $75.3 million remained unused under our Board-authorized repurchase program. We record shares of common stock repurchased at cost as treasury stock, resulting in a reduction of stockholders’ equity in the condensed consolidated balance sheets. When the treasury shares are contributed under our employee benefit plans or issued for option exercises, we use a first-in, first-out (“FIFO”) method for determining cost. The difference between the cost of the shares and the market price at the time of contribution to an employee benefit plan is added to or deducted from additional paid in capital. On November 1, 2018, our Board of Directors authorized the repurchase of up to $350 million of our common stock, in addition to the remaining authorization from February 20, 2017. The repurchase program does not include a specific timetable or price targets and may be suspended or terminated at any time. Share repurchases may be made from time to time in either open market or private transactions. The repurchase program does not require us to acquire any specific number of shares, and the program may be suspended or discontinued at any time. The timing, volume and nature of share repurchases will be at the discretion of management, depending on market conditions, alternative options for the use of cash, applicable securities laws and other factors.

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2018
Postemployment Benefits [Abstract]
Retirement Plans	Retirement Plans The following table summarizes the components of net periodic benefit cost (income) for our defined benefit pension plans: Three Months Ended September 30, Pensions Other Benefits In millions 2018 2017 2018 2017 Components of net periodic benefit cost (income): Service cost (1) $ 0.5 $ 0.3 $ — $ — Interest cost (2) 0.2 0.2 — — Expected return on plan assets (2) (0.2 ) (0.2 ) — — Recognized net actuarial and other (gain) loss (2) — — — — Net periodic benefit cost (income) $ 0.5 $ 0.3 $ — $ — _______________ (1) Included in "Cost of sales" on the condensed consolidated statements of operations. (2) Included in "Other (income) expense, net" on the condensed consolidated statements of operations. Nine Months Ended September 30, Pensions Other Benefits In millions 2018 2017 2018 2017 Components of net periodic benefit cost (income): Service cost (1) $ 1.3 $ 0.8 $ — $ — Interest cost (2) 0.6 0.6 — — Expected return on plan assets (2) (0.6 ) (0.6 ) — — Recognized net actuarial and other (gain) loss (2) 0.1 — — — Net periodic benefit cost (income) $ 1.4 $ 0.8 $ — $ — _______________ (1) Included in "Cost of sales" on the condensed consolidated statements of operations. (2) Included in "Other (income) expense, net" on the condensed consolidated statements of operations. We made a voluntary cash contribution of $1.5 million to our Union Hourly defined benefit pension plan in the three and nine months ended September 30, 2018 . There are no required cash contributions to our Union Hourly defined benefit pension plan in 2018, and we currently have no plans to make any additional voluntary cash contributions for the remainder of the year.

Restructuring and other (income

Restructuring and other (income) charges, net	9 Months Ended
	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring and other (income) charges, net	Restructuring and other (income) charges, net We continually perform strategic reviews and assess the return on our operations which sometimes results in a plan to restructure the business. The cost and benefit of these strategic restructuring initiatives are recorded as restructuring and other (income) charges, net in our condensed consolidated statements of operations. These costs are excluded from our operating segment results. We record an accrual for severance and other non-recurring costs under the provisions of the relevant accounting guidance. Additionally, in some restructuring plans write-downs of long-lived assets may occur. Two types of assets are impacted: assets to be disposed of by sale and assets to be abandoned. Assets to be disposed of by sale are measured at the lower of carrying amount or estimated net proceeds from the sale. Assets to be abandoned with no remaining future service potential are written down to amounts expected to be recovered. The useful life of assets to be abandoned that have a remaining future service potential are adjusted and depreciation is recorded over the adjusted useful life. Below provides detail of the Restructuring and other (income) charges, net incurred. Detail on the restructuring charges and asset disposal activities is provided below. Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Restructuring and other (income) charges, net Gain on sale of assets and businesses $ — $ — $ (0.6 ) $ — Severance and other employee-related costs (1) — — — 1.3 Other (income) charges, net (2) — 0.1 — 2.2 Total restructuring and other (income) charges, net $ — $ 0.1 $ (0.6 ) $ 3.5 _______________ (1) Represents severance and employee benefit charges. Income represents adjustments to previously recorded severance and employee benefits. (2) Primarily represents costs associated with rental payments, contract terminations, and other miscellaneous exit costs. Other income primarily represents favorable developments on previously recorded exit costs as recoveries associated with restructuring activities. 2018 activities In February 2018, we sold assets from the Performance Chemicals derivatives operations in Duque De Caxias, Rio de Janeiro, Brazil. These assets were part of a facility that was closed as a result of a restructuring event in 2016. As a result of this sale, we recorded zero and $0.6 million as a gain on sale of assets in the three and nine months ended September 30, 2018 , respectively. 2017 activities In January 2017, we initiated a reorganization to streamline our leadership team, flatten the organization and reduce costs. As a result of this reorganization, we recorded zero and $1.3 million , respectively, in severance and other employee-related costs in the three and nine months ended September 30, 2017 . During the three and nine months ended September 30, 2017 , we also recorded $0.1 million and $2.2 million , respectively, of additional miscellaneous exit costs primarily associated with the exit of our Performance Chemicals' manufacturing operations in Palmeira, Santa Catarina, Brazil which began in the fourth quarter of 2016. Roll forward of Restructuring Reserves The following table shows a roll forward of restructuring reserves that will result in cash spending. Balance at Change in Cash Balance at In millions 12/31/2017 (1) Reserve (2) Payments Other (3) 9/30/2018 (1) Restructuring Reserves $ 0.2 — (0.1 ) — $ 0.1 _______________ (1) Included in "Accrued expenses" on the condensed consolidated balance sheets. (2) Includes severance and other employee-related costs, exited leases, contract terminations and other miscellaneous exit costs. Any asset write-downs including accelerated depreciation and impairment charges are not included in the above table. (3) Primarily foreign currency translation adjustments.

Income taxes

Income taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three and nine months ended September 30, 2018 and 2017 , the effective tax rates, including discrete items, were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Effective tax rate 24.1 % 30.3 % 21.6 % 31.6 % We determine our interim tax provision using an Estimated Annual Effective Tax Rate methodology (“EAETR”). The EAETR is applied to the year-to-date ordinary income, exclusive of discrete items. The tax effects of discrete items are then included to arrive at the total reported interim tax provision. The determination of the EAETR is based upon a number of estimates, including the estimated annual pre-tax ordinary income in each tax jurisdiction in which we operate. As our projections of ordinary income change throughout the year, the EAETR will change period-to-period. The tax effects of discrete items are recognized in the tax provision in the period they occur. Depending on various factors, such as the item’s significance in relation to total income and the rate of tax applicable in the jurisdiction to which it relates, discrete items in any quarter may materially impact the reported effective tax rate. As a global enterprise, our tax expense may be impacted by changes in tax rates or laws, the finalization of tax audits and reviews, as well as other factors. As such, there may be significant volatility in interim tax provisions. The below table provides a reconciliation between our reported effective tax rates and the EAETR. Three Months Ended September 30, 2018 2017 In millions, except percentages Before tax Tax Effective tax rate % impact Before tax Tax Effective tax rate % impact Consolidated operations $ 68.1 $ 16.4 24.1 % $ 55.1 $ 16.7 30.3 % Discrete items: Separation costs — — 0.2 0.1 Restructuring and other (income) charges, net — — 0.1 0.1 Acquisition and other related costs (1) — — 4.1 1.5 Results of legal entities with full valuation allowances (2) — — 0.5 — Other tax only discrete items — 0.2 — 0.1 Total discrete items — 0.2 4.9 1.8 Consolidated operations, before discrete items $ 68.1 $ 16.6 $ 60.0 $ 18.5 Quarterly effect of changes in the EAETR (3) 24.4 % 30.8 % Nine Months Ended September 30, 2018 2017 In millions, except percentages Before tax Tax Effective tax rate % impact Before tax Tax Effective tax rate % impact Consolidated operations $ 178.2 $ 38.5 21.6 % $ 142.1 $ 44.9 31.6 % Discrete items: Separation costs — — 0.7 0.3 Restructuring and other (income) charges, net (0.6 ) — 3.5 0.7 Acquisition and other related costs (1) 5.7 1.3 4.1 1.5 Results of legal entities with full valuation allowances (2) — — 2.0 — Other tax only discrete items — 0.3 — (0.3 ) Total discrete items 5.1 1.6 10.3 2.2 Consolidated operations, before discrete items $ 183.3 $ 40.1 $ 152.4 $ 47.1 EAETR (3) 21.9 % 30.9 % _______________ (1) Charges primarily relate to legal and professional fees and inventory step-up amortization incurred associated with the Acquisition. The legal and professional fees of $4.3 million and the inventory step-up amortization of $1.4 million are included in "Acquisition-related costs" and "Cost of sales" on the condensed consolidated statement of operations, respectively. (2) Legal entities within the consolidated results of Ingevity with full valuation allowances are treated discretely for income tax purposes. (3) Decrease in EAETR for the three and nine months ended September 30, 2018 , as compared to September 30, 2017 , is primarily due to the effect of U.S. Tax Reform, which was enacted in December 2017. On December 22, 2017, Staff Accounting Bulletin No. 118 ("SAB 118") was issued to address the application of GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of U.S. Tax Reform. In accordance with SAB 118, we determined that the $24.5 million of the provisional deferred tax expense recorded in connection with the re-measurement of certain deferred tax assets and liabilities and current tax expense recorded in connection with any other provisions of U.S. Tax Reform were reasonable estimates at December 31, 2017. In the nine months ended September 30, 2018 , no additional adjustments were recorded in relation to the re-measurement of certain deferred tax assets and liabilities and minimal current tax expense was recorded in connection with other provisions of U.S. Tax Reform. Additional work may be necessary as the U.S. Treasury Department, the IRS, or other standard setting bodies interpret or issue new guidance on how the provisions of U.S. Tax Reform should be applied that may be different from our interpretation as of the date of this filing. Any subsequent adjustment to these amounts will be recorded to current tax expense in the period when the analysis is complete.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	Commitments and contingencies Legal Proceedings We are, from time to time, involved in routine litigation incidental to our operations. None of the litigation in which we are currently involved, individually or in the aggregate, is material to our consolidated financial condition, liquidity or results of operations nor are we aware of any material pending or contemplated proceedings.

Segment information

Segment information	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segment information	Segment information Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Net sales Performance Materials $ 96.3 $ 85.4 $ 287.9 $ 258.3 Automotive Technologies product line 86.6 75.6 258.6 230.1 Process Purifications product line 9.7 9.8 29.3 28.2 Performance Chemicals $ 214.9 $ 178.7 $ 567.1 $ 484.6 Oilfield Technologies product line 32.5 20.3 84.0 58.1 Pavement Technologies product line 68.1 64.5 152.2 137.2 Industrial Specialties product line 114.3 93.9 330.9 289.3 Total net sales (1) $ 311.2 $ 264.1 $ 855.0 $ 742.9 Segment operating profit (2) Performance Materials $ 36.3 $ 29.3 $ 109.8 $ 89.5 Performance Chemicals 39.7 33.4 95.3 70.2 Total segment operating profit (1) $ 76.0 $ 62.7 $ 205.1 $ 159.7 Separation costs (3) — (0.2 ) — (0.7 ) Restructuring and other income (charges), net (4) — (0.1 ) 0.6 (3.5 ) Acquisition and other related costs (5) — (4.1 ) (5.7 ) (4.1 ) Interest expense, net (7.9 ) (3.2 ) (21.8 ) (9.3 ) (Provision) benefit for income taxes (16.4 ) (16.7 ) (38.5 ) (44.9 ) Net (income) loss attributable to noncontrolling interest (2.2 ) (4.6 ) (12.7 ) (12.3 ) Net income (loss) attributable to Ingevity stockholders $ 49.5 $ 33.8 $ 127.0 $ 84.9 _______________ (1) Relates to external customers only, all intersegment sales and related profit have been eliminated in consolidation. (2) Segment operating profit is defined as segment revenue less segment operating expenses (segment operating expenses consist of costs of sales, selling, general and administrative expenses and other (income) expense, net). We have excluded the following items from segment operating profit: interest expense associated with corporate debt facilities, income taxes, gains (or losses) on divestitures of businesses, restructuring and other (income) charges, separation costs, acquisition and other related costs and net income (loss) attributable to noncontrolling interest. (3) Represents transaction costs associated with separation of Ingevity from Westrock. These costs are primarily related to professional fees associated with separation activities within the finance, tax, and legal functions. (4) Income (charges) for all periods presented related to our Performance Chemicals segment. (5) Charges associated with the acquisition and integration of the Pine Chemical Business. See below for more detail on the charges incurred and Note 4 within these Condensed Consolidated Financial Statements for more information. Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Legal and professional service fees (1) $ — $ 4.1 $ 4.3 $ 4.1 Inventory fair value step-up amortization (2) — — 1.4 — Acquisition and other related costs $ — $ 4.1 $ 5.7 $ 4.1 _______________ (1) Included within "Acquisition and other related costs" on the condensed consolidated statement of operations. (2) Included within "Cost of sales" on the condensed consolidated statement of operations.

Earnings (loss) per share

Earnings (loss) per share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings (loss) per share	Earnings (loss) per share Basic earnings (loss) per share is computed by dividing net income (loss) attributable to Ingevity stockholders for the period by the weighted average number of common shares outstanding during the period. Diluted earnings (loss) per share is computed by dividing net income (loss) attributable to Ingevity stockholders for the period by the weighted average number of shares of common stock and potentially dilutive common stock outstanding for the period. The calculation of diluted net income per share excludes all anti-dilutive common shares. Three Months Ended September 30, Nine Months Ended September 30, In millions, except share and per share data 2018 2017 2018 2017 Net income (loss) attributable to Ingevity stockholders $ 49.5 $ 33.8 $ 127.0 $ 84.9 Basic and Diluted earnings (loss) per share Basic earnings (loss) per share attributable to Ingevity stockholders $ 1.18 $ 0.80 $ 3.02 $ 2.01 Diluted earnings (loss) per share attributable to Ingevity stockholders 1.16 0.79 2.98 2.00 Shares (in thousands) Weighted average number of common stock outstanding - Basic 42,037 42,139 42,070 42,137 Weighted average additional shares assuming conversion of potential common stock 620 410 554 383 Shares - diluted basis 42,657 42,549 42,624 42,520 The following average number of potential common shares were antidilutive and, therefore, were not included in the diluted earnings per share calculation: Three Months Ended September 30, Nine Months Ended September 30, In thousands 2018 2017 2018 2017 Average number of potential common shares - antidilutive 17 93 77 94

New accounting guidance (Polici

New accounting guidance (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Income tax	We determine our interim tax provision using an Estimated Annual Effective Tax Rate methodology (“EAETR”). The EAETR is applied to the year-to-date ordinary income, exclusive of discrete items. The tax effects of discrete items are then included to arrive at the total reported interim tax provision. The determination of the EAETR is based upon a number of estimates, including the estimated annual pre-tax ordinary income in each tax jurisdiction in which we operate. As our projections of ordinary income change throughout the year, the EAETR will change period-to-period. The tax effects of discrete items are recognized in the tax provision in the period they occur. Depending on various factors, such as the item’s significance in relation to total income and the rate of tax applicable in the jurisdiction to which it relates, discrete items in any quarter may materially impact the reported effective tax rate. As a global enterprise, our tax expense may be impacted by changes in tax rates or laws, the finalization of tax audits and reviews, as well as other factors. As such, there may be significant volatility in interim tax provisions.
New accounting guidance	New accounting guidance In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-15 "Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40) Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract." This ASU requires companies to defer specific implementation costs incurred in a Cloud Computing Arrangement ("CCA") that are often expensed as incurred under current GAAP, and recognize the expense over the noncancellable term of the CCA. The new standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Although we are still evaluating the impact of this new standard, we do not believe that the adoption will materially impact our Condensed Consolidated Financial Statements and related disclosures. In August 2018, the FASB issued ASU 2018-13 "Fair Value Measurement (Topic 820) Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement." This ASU eliminates, amends, and adds disclosure requirements for fair value measurements. The new standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Although we are still evaluating the impact of this new standard, we do not believe that the adoption will materially impact our Condensed Consolidated Financial Statements and related disclosures. In June 2018, the FASB issued ASU 2018-07 "Compensation-Stock Compensation (Topic 718) - Improvements to Nonemployee Share-Based Payment Accounting." This ASU provides for a single accounting model for all share-based payments, with the employee based guidance now applying to nonemployee share-based transactions. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Although we are still evaluating the impact of this new standard, we do not believe that the adoption will materially impact our Condensed Consolidated Financial Statements and related disclosures. In February 2018, the FASB issued ASU 2018-02 "Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from AOCI." This ASU provides for the reclassification of the effect of remeasuring deferred tax balances related to items within accumulated other comprehensive income to retained earnings resulting from the provisions of the December 22, 2017 U.S. Tax Cuts and Jobs Act (the "U.S. Tax Reform"). We early adopted this new ASU in the fourth quarter of 2017, and as a result, we reclassified $0.3 million from AOCI to retained earnings. In August 2017, the FASB issued ASU 2017-12 "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" that amends the hedge accounting recognition and presentation requirements under hedge accounting. The new standard will make more financial and non-financial hedging strategies eligible for hedge accounting, amends the presentation and disclosure requirements, and simplifies how companies assess effectiveness. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those years. We early adopted this new ASU during the fourth quarter of 2017. The impact of adoption did not have a material effect on our Condensed Consolidated Financial Statements and related disclosures. In January 2017, the FASB issued ASU 2017-04 "Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment," which amends and simplifies the accounting standard for goodwill impairment. The new standard removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount a reporting unit’s carrying value exceeds its fair value, limited to the total amount of goodwill allocated to that reporting unit. The new standard is effective for annual and any interim impairment tests for periods beginning after December 15, 2019. The Company early adopted this standard on January 1, 2018. The impact of adoption did not have a material impact on our Condensed Consolidated Financial Statements and related disclosures. In January 2017, the FASB issued ASU No. 2017-01 "Business Combinations (Topic 805): Clarifying the Definition of a Business." The new guidance narrows the existing definition of a business and provides a framework for evaluating whether a transaction should be accounted for as an acquisition (or disposal) of assets or a business. The guidance requires an entity to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the set of transferred assets and activities (collectively, the "set") is not a business. To be considered a business, the set would need to include an input and a substantive process that together significantly contribute to the ability to create outputs, as defined by the ASU. The guidance is effective for annual reporting periods beginning after December 15, 2017, including interim periods within those annual reporting periods, and should be applied prospectively. We adopted this standard on January 1, 2018. We have utilized this new guidance in our accounting for the Georgia Pacific's Pine Chemical Business acquisition; refer to Note 4 for more information. In August 2016, the FASB issued final amendments to clarify how entities should classify certain cash receipts and cash payments in ASU 2016-15 "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." The new guidance clarifies the classification on the statement of cash flows of certain cash receipts and disbursements such as distributions received from equity method investees, proceeds from settlement of insurance claims, and proceeds from the settlement of corporate-owned life insurance policies. The new standard is effective for fiscal years beginning after December 15, 2017, including interim periods within those years. The Company adopted this standard on January 1, 2018. The impact of adoption did not have a material impact on our Condensed Consolidated Financial Statements and related disclosures. In February 2016, the FASB issued ASU 2016-02 "Leases (Topic 842)." Under the new guidance, lessees will be required to recognize for all leases (with the exception of short-term leases) a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. We expect to adopt these provisions on January 1, 2019, including interim periods subsequent to the adoption date, which can be applied using a full retrospective or modified retrospective approach. Since the issuance of ASU 2016-02, the FASB has issued several amendments which clarify certain points in Topic 842, including ASU 2018-01 ("Land Easement Practical Expedient"), ASU 2018-10 ("Codification Improvements"), and ASU 2018-11 ("Targeted Improvements"). We anticipate adopting all of these standards at the same time effective January 1, 2019. Based upon the results of our initial assessment thus far, we plan to adopt this new standard under the modified retrospective approach, utilizing the practical expedients upon transition that will retain lease classification and initial direct costs for any leases that exist prior to adoption of the standard. We are in the process of cataloging our existing lease contracts and implementing changes to our systems. As a lessee, the majority of our leases under existing guidance are classified as operating leases, and therefore, not recorded on the balance sheet but are recorded in the statement of earnings as expense as incurred. Upon adoption of the new guidance, we will be required to record the vast majority of these operating leases on the balance sheet as a right-of-use asset and a lease liability. The timing of expense recognition and classification in the statement of earnings could change based on the classification of leases as either operating or financing; however, we have not completed our evaluation to determine to what extent. In May 2014, the FASB issued ASU 2014-09 “Revenue from Contracts with Customers (Topic 606),” which supersedes both the revenue recognition requirement to Accounting Standards Codification ("ASC") 605 “Revenue Recognition” and most industry-specific guidance. The core principle of the new standard (ASC 606) is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. An entity must also disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. In 2016 and 2017, the FASB issued several ASUs that provided additional clarity on numerous topics as well as providing technical corrections to the original ASU 2014-09. We adopted this new standard on January 1, 2018, utilizing the modified retrospective method applied to those contracts that were not completed as of January 1, 2018. The majority of our sales revenue remains unchanged by ASC 606 and continues to be recognized when products are shipped from our manufacturing and warehousing facilities, which represents the point at which control is transferred to the customer. For certain limited contracts, where we are producing goods with no alternative use and for which we have an enforceable right to payment for performance completed to date, we are recognizing revenue as goods are manufactured, rather than when they are shipped as previously done under ASC 605.

New accounting guidance (Tables

New accounting guidance (Tables)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The cumulative effect of the changes made to our condensed consolidated balance sheet on January 1, 2018, due to the adoption of ASC 606, were as follows: In millions Balance at December 31, 2017 Adjustments Balance at January 1, 2018 Assets Accounts receivable, net of allowance $ 100.0 $ 0.3 $ 100.3 Inventories, net 160.0 (2.4 ) 157.6 Prepaid and other current assets 20.8 5.1 25.9 Liabilities Accrued expenses 20.0 0.9 20.9 Deferred income taxes 41.3 0.5 41.8 Equity Retained earnings $ 142.8 $ 1.6 $ 144.4 In accordance with ASC 606, the impact of adoption on our condensed consolidated statement of operations and balance sheet were as follows: Three Months Ended September 30, 2018 In millions As reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Net sales $ 311.2 $ 311.4 $ (0.2 ) Cost of sales 192.6 192.8 (0.2 ) Provision (benefit) for income taxes 16.4 16.4 — Net income (loss) $ 51.7 $ 51.7 $ — Nine Months Ended September 30, 2018 In millions As reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Net sales $ 855.0 $ 854.7 $ 0.3 Cost of sales 535.8 536.1 (0.3 ) Provision (benefit) for income taxes 38.5 38.4 0.1 Net income (loss) $ 139.7 $ 139.2 $ 0.5 September 30, 2018 In millions As reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Assets Accounts receivable, net of allowance $ 140.4 $ 140.0 $ 0.4 Inventories, net 194.3 196.5 (2.2 ) Prepaid and other current assets 28.6 23.1 5.5 Liabilities Accrued expenses 26.2 25.1 1.1 Deferred income taxes 31.2 31.1 0.1 Equity Retained earnings $ 271.4 $ 268.9 $ 2.5

Acquisition (Tables)

Acquisition (Tables)	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the consideration paid for the Acquisition and the amounts of the assets acquired and liabilities assumed as of the Acquisition Date. Purchase Price Allocation In millions Weighted Average Amortization Period Fair Value Accounts receivable $ 16.2 Inventories (1) 9.4 Property, plant and equipment 39.3 Intangible assets (2) Patents 12 years 1.9 Non-compete agreement 3 years 2.2 Customer relationships 11 years 129.0 Goodwill (3) 118.7 Other assets 0.1 Total fair value of assets acquired 316.8 Accounts payable 0.8 Accrued expenses 0.5 Total fair value of liabilities assumed $ 1.3 Total cash paid $ 315.5 _______________ (1) Fair value of finished good inventories acquired included a step-up in the value of approximately $1.4 million, of which zero and $1.4 million was expensed in the three and nine months ended September 30, 2018, respectively. The expense is included in "Cost of sales" on the condensed consolidated statement of operations. (2) The aggregate amortization expense was $3.2 million and $7.4 million for the three and nine months ended September 30, 2018, respectively. Estimated amortization expense is as follows: 2018 - $10.6 million, 2019 - $12.7 million, 2020 - $12.7 million, 2021 - $12.0 million, and 2022 - $11.8 million. (3) Goodwill largely consists of expected cost synergies and economies of scale resulting from the business combination. We expect the full amount to be deductible for income tax purposes.
Business Acquisition, Pro Forma Information	Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Net sales $ 311.2 $ 288.1 $ 875.2 $ 814.5 Income (loss) before income taxes 68.1 58.8 184.7 141.3 Diluted earnings (loss) per share attributable to Ingevity stockholders $ 1.16 $ 0.85 $ 3.10 $ 1.99

Revenues (Tables)

Revenues (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables present our Net sales disaggregated by product line and geography. In millions Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 Automotive Technologies product line $ 86.6 $ 258.6 Process Purification product line 9.7 29.3 Performance Materials segment $ 96.3 $ 287.9 Oilfield Technologies product line 32.5 84.0 Pavement Technologies product line 68.1 152.2 Industrial Specialties product line 114.3 330.9 Performance Chemicals segment $ 214.9 $ 567.1 Consolidated Net sales $ 311.2 $ 855.0 The following table presents our Net sales disaggregated by geography, based on the delivery address of our customer. In millions Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 North America $ 220.6 $ 587.3 Asia Pacific 45.0 121.9 Europe, Middle East and Africa 40.5 128.8 South America 5.1 17.0 Consolidated Net sales $ 311.2 $ 855.0
Contract with Customer, Asset and Liability	The following table provides information about contract assets and contract liabilities from contracts with customers. The contract assets primarily relate to our rights to consideration for products produced but not billed at the reporting date on contracts with certain customers. The contract assets are recognized as accounts receivables when the rights become unconditional and the customer has been billed. Contract liabilities represent obligations to transfer goods to a customer for which we have received consideration from our customer. For all periods presented we had no contract liabilities. In millions Contract Asset Balance at January 1, 2018 $ 4.4 Contract asset additions 12.3 Reclassification to accounts receivable, billed to customers (11.9 ) Balance at September 30, 2018 (1) $ 4.8 _______________ (1) Included within "Prepaid and other current assets" on the condensed consolidated balance sheet.

Financial Instruments, Risk M_2

Financial Instruments, Risk Management, and Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring	The following information is presented for assets and liabilities that are recorded in the condensed consolidated balance sheets at fair value measured on a recurring basis. There were no transfers of assets and liabilities that are recorded at fair value between Level 1 and Level 2 during the period reported. There were no non-recurring fair value measurements in the condensed consolidated balance sheets as of September 30, 2018 or December 31, 2017 . In millions Level 1 (1) Level 2 (2) Level 3 (3) Total September 30, 2018 Assets: Equity securities (4) $ 0.5 $ — $ — $ 0.5 Foreign currency hedging (4) — 0.5 — 0.5 Commodity hedging (4) — 0.1 — 0.1 Deferred compensation plan investments (5) 2.3 — — 2.3 Total assets $ 2.8 $ 0.6 $ — $ 3.4 Liabilities: Deferred compensation arrangement (5) $ 4.5 $ — $ — $ 4.5 Separation-related reimbursement awards (6) 0.3 — — 0.3 Total liabilities $ 4.8 $ — $ — $ 4.8 December 31, 2017 Assets: Equity securities (4) $ 1.8 $ — $ — $ 1.8 Total assets $ 1.8 $ — $ — $ 1.8 Liabilities: Deferred compensation arrangement (5) $ 2.0 $ — $ — $ 2.0 Separation-related reimbursement awards (6) 0.9 — — 0.9 Total liabilities $ 2.9 $ — $ — $ 2.9 ______________ (1) Quoted prices in active markets for identical assets. (2) Quoted prices for similar assets and liabilities in active markets. (3) Significant unobservable inputs. (4) Represents securities with readily determinable fair value. Securities are included within "Prepaid and other current assets" on the condensed consolidated balance sheet. (5) Consists of a deferred compensation arrangement, through which we hold various investment securities, recognized on our balance sheets. Both the asset and liability are recorded at fair value, and are included within "Other assets" and "Other liabilities" on the condensed consolidated balance sheets, respectively. (6) Included within "Accrued expenses" on the condensed consolidated balance sheet. The expense recognized during the three and nine months ended September 30, 2018 , was $0.1 million and zero , and during the three and nine months ended September 30, 2017 , was zero and $0.3 million , respectively.

Inventories, net (Tables)

Inventories, net (Tables)	9 Months Ended
	Sep. 30, 2018
Inventory Disclosure [Abstract]
Schedule of Inventory	In millions September 30, 2018 December 31, 2017 Raw materials $ 40.8 $ 40.1 Production materials, stores and supplies 16.8 13.4 Finished and in-process goods 145.2 114.3 Subtotal 202.8 167.8 Less: excess of cost over LIFO cost (8.5 ) (7.8 ) Inventories, net $ 194.3 $ 160.0

Property, plant and equipment_2

Property, plant and equipment, net (Tables)	9 Months Ended
	Sep. 30, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	In millions September 30, 2018 December 31, 2017 Machinery and equipment $ 835.2 $ 792.5 Buildings and leasehold equipment 112.2 115.0 Land and land improvements 19.6 18.0 Construction in progress 70.1 35.8 Total cost 1,037.1 961.3 Less: accumulated depreciation (538.2 ) (522.8 ) Property, plant and equipment, net $ 498.9 $ 438.5

Goodwill and other intangible_2

Goodwill and other intangible assets, net (Tables)	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Operating Segments In millions Performance Chemicals Performance Materials Total December 31, 2017 $ 8.1 $ 4.3 $ 12.4 Acquisitions (1) 118.7 — 118.7 Foreign currency translation (0.5 ) — (0.5 ) September 30, 2018 $ 126.3 $ 4.3 $ 130.6 _______________ (1) See Note 4 for more information.
Schedule of Finite-Lived Intangible Assets	All of our other intangible assets, net are related to the Performance Chemicals operating segment. The following table summarizes intangible assets: September 30, 2018 December 31, 2017 In millions Gross carrying amount Accumulated amortization Net Gross carrying amount Accumulated amortization Net Brands (1) $ 13.9 $ 12.2 $ 1.7 $ 13.9 $ 11.8 $ 2.1 Patents (2) 1.9 0.2 1.7 — — — Customer contracts and relationships (2) 157.2 33.2 124.0 28.2 25.4 2.8 Non-compete agreements (2) 2.2 0.4 1.8 — — — Other intangibles, net $ 175.2 $ 46.0 $ 129.2 $ 42.1 $ 37.2 $ 4.9 _______________ (1) Represents trademarks, trade names and know-how. (2) See Note 4 for more information.
Finite-lived Intangible Assets Amortization Expense	The amortization expense related to our intangible assets in the table above is shown in the table below. Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Cost of sales $ 0.2 $ 0.3 $ 0.6 $ 1.0 Selling, general and administrative expenses 3.4 0.3 8.2 0.9 Total amortization expense $ 3.6 $ 0.6 $ 8.8 $ 1.9

Debt including capital lease _2

Debt including capital lease obligations (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Current and long-term debt including capital lease obligations consisted of the following: September 30, 2018 In millions, except percentages Interest rate Maturity date September 30, 2018 December 31, 2017 Revolving credit facility (1) 3.51% 2023 $ — $ — Term loan facility 3.49% 2023 375.0 375.0 Senior notes 4.50% 2026 300.0 — Capital lease obligations 7.67% 2027 80.0 80.0 Other 5.09% 2018-2021 0.7 — Total debt including capital lease obligations 755.7 455.0 Less: debt issuance costs 6.8 1.6 Total debt including capital lease obligations, net of debt issuance costs 748.9 453.4 Less: debt maturing within one year (2) 4.9 9.4 Long-term debt including capital lease obligations $ 744.0 $ 444.0 ______________ (1) Letters of credit outstanding under the revolving credit facility were $1.8 million and available funds under the facility were $748.2 million at September 30, 2018 . (2) Debt maturing within one year is included in "Notes payable and current maturities of long-term debt" on the condensed consolidated balance sheets.

Equity (Tables)

Equity (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Schedule of Stockholders' Equity	Ingevity Stockholders' Equity Common Stock Additional paid in capital Retained earnings Accumulated other comprehensive income (loss) Treasury stock Total In millions, except per share data Shares Amount Balance at December 31, 2017 42,209 $ 0.4 $ 140.1 $ 142.8 $ (11.7 ) $ (7.7 ) $ 263.9 Net income (loss) — — — 127.0 — — 127.0 Other comprehensive income (loss) — — — — (6.1 ) — (6.1 ) Common stock issued 107 — — — — — — Exercise of stock options, net 6 — 0.2 — — — 0.2 Tax payments related to vested restricted stock units — — — — — (2.1 ) (2.1 ) Share repurchase program — — — — — (18.1 ) (18.1 ) Share-based compensation plans — — 10.0 — — 1.5 11.5 Adoption of ASC 606 — — — 1.6 — — 1.6 Acquisition of noncontrolling interest — — (55.2 ) — — — (55.2 ) Balance at September 30, 2018 42,322 $ 0.4 $ 95.1 $ 271.4 $ (17.8 ) $ (26.4 ) $ 322.7 Noncontrolling Interest In millions 2018 2017 Balance at December 31, $ 14.0 $ 7.6 Net income (loss) attributable to noncontrolling interests 12.7 12.3 Noncontrolling interest distributions (15.3 ) (8.2 ) Acquisition of noncontrolling interest $ (11.4 ) $ — Balance at September 30, $ — $ 11.7 Ingevity Stockholders' Equity Common Stock Additional paid in capital Retained earnings Accumulated other comprehensive income (loss) Treasury stock Total In millions, except per share data Shares Amount Balance at June 30, 2018 42,309 $ 0.4 $ 146.9 $ 221.9 $ (14.0 ) $ (17.2 ) $ 338.0 Net income (loss) — — — 49.5 — — 49.5 Other comprehensive income (loss) — — — — (3.8 ) — (3.8 ) Common stock issued 13 — — — — — — Exercise of stock options, net — — — — — — — Tax payments related to vested restricted stock units — — — — — (0.6 ) (0.6 ) Share repurchase program — — — — — (9.0 ) (9.0 ) Share-based compensation plans — — 3.4 — — 0.4 3.8 Adoption of ASC 606 — — — — — — — Acquisition of noncontrolling interest — $ — $ (55.2 ) $ — $ — $ — $ (55.2 ) Balance at September 30, 2018 42,322 $ 0.4 $ 95.1 $ 271.4 $ (17.8 ) $ (26.4 ) $ 322.7 Noncontrolling Interest In millions 2018 2017 Balance at June 30, $ 11.3 $ 10.5 Net income (loss) attributable to noncontrolling interests 2.2 4.6 Noncontrolling interest distributions (2.1 ) (3.4 ) Acquisition of noncontrolling interest $ (11.4 ) $ — Balance at September 30, $ — $ 11.7

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2018
Postemployment Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures	The following table summarizes the components of net periodic benefit cost (income) for our defined benefit pension plans: Three Months Ended September 30, Pensions Other Benefits In millions 2018 2017 2018 2017 Components of net periodic benefit cost (income): Service cost (1) $ 0.5 $ 0.3 $ — $ — Interest cost (2) 0.2 0.2 — — Expected return on plan assets (2) (0.2 ) (0.2 ) — — Recognized net actuarial and other (gain) loss (2) — — — — Net periodic benefit cost (income) $ 0.5 $ 0.3 $ — $ — _______________ (1) Included in "Cost of sales" on the condensed consolidated statements of operations. (2) Included in "Other (income) expense, net" on the condensed consolidated statements of operations. Nine Months Ended September 30, Pensions Other Benefits In millions 2018 2017 2018 2017 Components of net periodic benefit cost (income): Service cost (1) $ 1.3 $ 0.8 $ — $ — Interest cost (2) 0.6 0.6 — — Expected return on plan assets (2) (0.6 ) (0.6 ) — — Recognized net actuarial and other (gain) loss (2) 0.1 — — — Net periodic benefit cost (income) $ 1.4 $ 0.8 $ — $ — _______________ (1) Included in "Cost of sales" on the condensed consolidated statements of operations. (2) Included in "Other (income) expense, net" on the condensed consolidated statements of operations.

Restructuring and other (inco_2

Restructuring and other (income) charges, net (Tables)	9 Months Ended
	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs	Detail on the restructuring charges and asset disposal activities is provided below. Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Restructuring and other (income) charges, net Gain on sale of assets and businesses $ — $ — $ (0.6 ) $ — Severance and other employee-related costs (1) — — — 1.3 Other (income) charges, net (2) — 0.1 — 2.2 Total restructuring and other (income) charges, net $ — $ 0.1 $ (0.6 ) $ 3.5 _______________ (1) Represents severance and employee benefit charges. Income represents adjustments to previously recorded severance and employee benefits. (2) Primarily represents costs associated with rental payments, contract terminations, and other miscellaneous exit costs. Other income primarily represents favorable developments on previously recorded exit costs as recoveries associated with restructuring activities. The following table shows a roll forward of restructuring reserves that will result in cash spending. Balance at Change in Cash Balance at In millions 12/31/2017 (1) Reserve (2) Payments Other (3) 9/30/2018 (1) Restructuring Reserves $ 0.2 — (0.1 ) — $ 0.1 _______________ (1) Included in "Accrued expenses" on the condensed consolidated balance sheets. (2) Includes severance and other employee-related costs, exited leases, contract terminations and other miscellaneous exit costs. Any asset write-downs including accelerated depreciation and impairment charges are not included in the above table. (3) Primarily foreign currency translation adjustments.

Income taxes (Tables)

Income taxes (Tables)	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	For the three and nine months ended September 30, 2018 and 2017 , the effective tax rates, including discrete items, were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Effective tax rate 24.1 % 30.3 % 21.6 % 31.6 % The below table provides a reconciliation between our reported effective tax rates and the EAETR. Three Months Ended September 30, 2018 2017 In millions, except percentages Before tax Tax Effective tax rate % impact Before tax Tax Effective tax rate % impact Consolidated operations $ 68.1 $ 16.4 24.1 % $ 55.1 $ 16.7 30.3 % Discrete items: Separation costs — — 0.2 0.1 Restructuring and other (income) charges, net — — 0.1 0.1 Acquisition and other related costs (1) — — 4.1 1.5 Results of legal entities with full valuation allowances (2) — — 0.5 — Other tax only discrete items — 0.2 — 0.1 Total discrete items — 0.2 4.9 1.8 Consolidated operations, before discrete items $ 68.1 $ 16.6 $ 60.0 $ 18.5 Quarterly effect of changes in the EAETR (3) 24.4 % 30.8 % Nine Months Ended September 30, 2018 2017 In millions, except percentages Before tax Tax Effective tax rate % impact Before tax Tax Effective tax rate % impact Consolidated operations $ 178.2 $ 38.5 21.6 % $ 142.1 $ 44.9 31.6 % Discrete items: Separation costs — — 0.7 0.3 Restructuring and other (income) charges, net (0.6 ) — 3.5 0.7 Acquisition and other related costs (1) 5.7 1.3 4.1 1.5 Results of legal entities with full valuation allowances (2) — — 2.0 — Other tax only discrete items — 0.3 — (0.3 ) Total discrete items 5.1 1.6 10.3 2.2 Consolidated operations, before discrete items $ 183.3 $ 40.1 $ 152.4 $ 47.1 EAETR (3) 21.9 % 30.9 % _______________ (1) Charges primarily relate to legal and professional fees and inventory step-up amortization incurred associated with the Acquisition. The legal and professional fees of $4.3 million and the inventory step-up amortization of $1.4 million are included in "Acquisition-related costs" and "Cost of sales" on the condensed consolidated statement of operations, respectively. (2) Legal entities within the consolidated results of Ingevity with full valuation allowances are treated discretely for income tax purposes. (3) Decrease in EAETR for the three and nine months ended September 30, 2018 , as compared to September 30, 2017 , is primarily due to the effect of U.S. Tax Reform, which was enacted in December 2017.

Segment information (Tables)

Segment information (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Schedule of Segment Reporting Information	Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Net sales Performance Materials $ 96.3 $ 85.4 $ 287.9 $ 258.3 Automotive Technologies product line 86.6 75.6 258.6 230.1 Process Purifications product line 9.7 9.8 29.3 28.2 Performance Chemicals $ 214.9 $ 178.7 $ 567.1 $ 484.6 Oilfield Technologies product line 32.5 20.3 84.0 58.1 Pavement Technologies product line 68.1 64.5 152.2 137.2 Industrial Specialties product line 114.3 93.9 330.9 289.3 Total net sales (1) $ 311.2 $ 264.1 $ 855.0 $ 742.9 Segment operating profit (2) Performance Materials $ 36.3 $ 29.3 $ 109.8 $ 89.5 Performance Chemicals 39.7 33.4 95.3 70.2 Total segment operating profit (1) $ 76.0 $ 62.7 $ 205.1 $ 159.7 Separation costs (3) — (0.2 ) — (0.7 ) Restructuring and other income (charges), net (4) — (0.1 ) 0.6 (3.5 ) Acquisition and other related costs (5) — (4.1 ) (5.7 ) (4.1 ) Interest expense, net (7.9 ) (3.2 ) (21.8 ) (9.3 ) (Provision) benefit for income taxes (16.4 ) (16.7 ) (38.5 ) (44.9 ) Net (income) loss attributable to noncontrolling interest (2.2 ) (4.6 ) (12.7 ) (12.3 ) Net income (loss) attributable to Ingevity stockholders $ 49.5 $ 33.8 $ 127.0 $ 84.9 _______________ (1) Relates to external customers only, all intersegment sales and related profit have been eliminated in consolidation. (2) Segment operating profit is defined as segment revenue less segment operating expenses (segment operating expenses consist of costs of sales, selling, general and administrative expenses and other (income) expense, net). We have excluded the following items from segment operating profit: interest expense associated with corporate debt facilities, income taxes, gains (or losses) on divestitures of businesses, restructuring and other (income) charges, separation costs, acquisition and other related costs and net income (loss) attributable to noncontrolling interest. (3) Represents transaction costs associated with separation of Ingevity from Westrock. These costs are primarily related to professional fees associated with separation activities within the finance, tax, and legal functions. (4) Income (charges) for all periods presented related to our Performance Chemicals segment. (5) Charges associated with the acquisition and integration of the Pine Chemical Business. See below for more detail on the charges incurred and Note 4 within these Condensed Consolidated Financial Statements for more information.
Business Acquisition, Integration, Restructuring and Other Related Costs	Three Months Ended September 30, Nine Months Ended September 30, In millions 2018 2017 2018 2017 Legal and professional service fees (1) $ — $ 4.1 $ 4.3 $ 4.1 Inventory fair value step-up amortization (2) — — 1.4 — Acquisition and other related costs $ — $ 4.1 $ 5.7 $ 4.1 _______________ (1) Included within "Acquisition and other related costs" on the condensed consolidated statement of operations. (2) Included within "Cost of sales" on the condensed consolidated statement of operations.

Earnings (loss) per share (Tabl

Earnings (loss) per share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Three Months Ended September 30, Nine Months Ended September 30, In millions, except share and per share data 2018 2017 2018 2017 Net income (loss) attributable to Ingevity stockholders $ 49.5 $ 33.8 $ 127.0 $ 84.9 Basic and Diluted earnings (loss) per share Basic earnings (loss) per share attributable to Ingevity stockholders $ 1.18 $ 0.80 $ 3.02 $ 2.01 Diluted earnings (loss) per share attributable to Ingevity stockholders 1.16 0.79 2.98 2.00 Shares (in thousands) Weighted average number of common stock outstanding - Basic 42,037 42,139 42,070 42,137 Weighted average additional shares assuming conversion of potential common stock 620 410 554 383 Shares - diluted basis 42,657 42,549 42,624 42,520
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following average number of potential common shares were antidilutive and, therefore, were not included in the diluted earnings per share calculation: Three Months Ended September 30, Nine Months Ended September 30, In thousands 2018 2017 2018 2017 Average number of potential common shares - antidilutive 17 93 77 94

Background (Details)

Background (Details)	9 Months Ended
	Sep. 30, 2018segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of business segments	2

Basis of Consolidation and Pr_2

Basis of Consolidation and Presentation - Narrative (Details)	Sep. 30, 2018	Aug. 01, 2018
Purification Cellutions LLC
Other Ownership Interests [Line Items]
Ownership interest	30.00%	30.00%

New accounting guidance (Narrat

New accounting guidance (Narrative) (Details) - USD ($) $ in Millions	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASC 606	$ 1.6
AOCI | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASC 606		$ (3)
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASC 606	$ 1.6
Retained earnings | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASC 606		$ 0.3

New accounting guidance - Cumul

New accounting guidance - Cumulative effect of the changes (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts receivable, net of allowance	$ 140.4	$ 100.3	$ 100
Inventories, net	194.3	157.6	160
Prepaid and other current assets	28.6	25.9	20.8
Liabilities
Accrued expenses	26.2	20.9	20
Deferred income taxes	31.2	41.8	41.3
Equity
Retained earnings	271.4	144.4	142.8
Calculated under Revenue Guidance in Effect before Topic 606
Assets
Accounts receivable, net of allowance	140		100
Inventories, net	196.5		160
Prepaid and other current assets	23.1		20.8
Liabilities
Accrued expenses	25.1		20
Deferred income taxes	31.1		41.3
Equity
Retained earnings	268.9		$ 142.8
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Assets
Accounts receivable, net of allowance	0.4	0.3
Inventories, net	(2.2)	(2.4)
Prepaid and other current assets	5.5	5.1
Liabilities
Accrued expenses	1.1	0.9
Deferred income taxes	0.1	0.5
Equity
Retained earnings	$ 2.5	$ 1.6

New accounting guidance - Conde

New accounting guidance - Condensed consolidated statement of operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	$ 311.2	$ 264.1	$ 855	$ 742.9
Cost of sales	192.6	170.9	535.8	489.2
Provision (benefit) for income taxes	16.4	16.7	38.5	44.9
Net income (loss)	51.7	$ 38.4	139.7	$ 97.2
Balances without Adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	311.4		854.7
Cost of sales	192.8		536.1
Provision (benefit) for income taxes	16.4		38.4
Net income (loss)	51.7		139.2
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	(0.2)		0.3
Cost of sales	(0.2)		(0.3)
Provision (benefit) for income taxes	0		0.1
Net income (loss)	$ 0		$ 0.5

New accounting guidance - Con_2

New accounting guidance - Condensed consolidated balance sheet (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts receivable, net of allowance	$ 140.4	$ 100.3	$ 100
Inventories, net	194.3	157.6	160
Prepaid and other current assets	28.6	25.9	20.8
Liabilities
Accrued expenses	26.2	20.9	20
Deferred income taxes	31.2	41.8	41.3
Equity
Retained earnings	271.4	144.4	142.8
Calculated under Revenue Guidance in Effect before Topic 606
Assets
Accounts receivable, net of allowance	140		100
Inventories, net	196.5		160
Prepaid and other current assets	23.1		20.8
Liabilities
Accrued expenses	25.1		20
Deferred income taxes	31.1		41.3
Equity
Retained earnings	268.9		$ 142.8
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Assets
Accounts receivable, net of allowance	0.4	0.3
Inventories, net	(2.2)	(2.4)
Prepaid and other current assets	5.5	5.1
Liabilities
Accrued expenses	1.1	0.9
Deferred income taxes	0.1	0.5
Equity
Retained earnings	$ 2.5	$ 1.6

Acquisition (Narrative) (Detail

Acquisition (Narrative) (Details) - USD ($)	Mar. 08, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 24, 2018
Business Acquisition [Line Items]
Acquisition and other related costs		$ 0	$ 4,100,000	$ 5,700,000	$ 4,100,000
Inventory fair value step-up amortization		0	0	1,400,000	0
Acquisition-related costs		$ 0	$ 4,100,000	$ 4,300,000	$ 4,100,000
Georgia-Pacific Chemicals LLC
Business Acquisition [Line Items]
Total cash paid	$ 315,500,000
Weighted average useful life	20 years
Senior notes
Business Acquisition [Line Items]
Face amount						$ 300,000,000

Acquisition (Schedule of Recogn

Acquisition (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Mar. 08, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 130.6		$ 130.6		$ 12.4
Amortization expense		3.6	$ 0.6	8.8	$ 1.9
2,018		12.3		12.3
2,019		14.3		14.3
2,020		13.2		13.2
2,021		12.3		12.3
2,022		12.2		12.2
Georgia-Pacific Chemicals LLC
Business Acquisition [Line Items]
Weighted average useful life	20 years
Accounts receivable	$ 16.2
Inventories	9.4
Property, plant and equipment	39.3
Goodwill	118.7
Other assets	0.1
Total fair value of assets acquired	316.8
Accounts payable	0.8
Accrued expenses	0.5
Total fair value of liabilities assumed	1.3
Total cash paid	315.5
Inventory Step up		1.4		1.4
Inventory Expense		0		1.4
Amortization expense		3.2		7.4
2,018		10.6		10.6
2,019		12.7		12.7
2,020		12.7		12.7
2,021		12		12
2,022		$ 11.8		$ 11.8
Patents | Georgia-Pacific Chemicals LLC
Business Acquisition [Line Items]
Weighted average useful life				12 years
Intangibles assets	1.9
Customer contracts and relationships | Georgia-Pacific Chemicals LLC
Business Acquisition [Line Items]
Weighted average useful life				11 years
Intangibles assets	129
Non-compete | Georgia-Pacific Chemicals LLC
Business Acquisition [Line Items]
Weighted average useful life				3 years
Intangibles assets	$ 2.2

Acquisition (Business Acquisiti

Acquisition (Business Acquisition, Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Net sales	$ 311.2	$ 288.1	$ 875.2	$ 814.5
Income (loss) before income taxes	$ 68.1	$ 58.8	$ 184.7	$ 141.3
Diluted earnings (loss) per share attributable to Ingevity stockholders (usd per share)	$ 1.16	$ 0.85	$ 3.10	$ 1.99

Revenues - Revenue by segment (

Revenues - Revenue by segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Consolidated Net sales	$ 311.2	$ 264.1	$ 855	$ 742.9
Performance Materials
Disaggregation of Revenue [Line Items]
Consolidated Net sales	96.3	85.4	287.9	258.3
Performance Materials | Automotive Technologies product line
Disaggregation of Revenue [Line Items]
Consolidated Net sales	86.6	75.6	258.6	230.1
Performance Materials | Process Purification product line
Disaggregation of Revenue [Line Items]
Consolidated Net sales	9.7	9.8	29.3	28.2
Performance Materials | Oilfield Technologies product line
Disaggregation of Revenue [Line Items]
Consolidated Net sales			84
Performance Materials | Pavement Technologies product line
Disaggregation of Revenue [Line Items]
Consolidated Net sales			152.2
Performance Materials | Industrial Specialties product line
Disaggregation of Revenue [Line Items]
Consolidated Net sales			330.9
Performance Chemicals
Disaggregation of Revenue [Line Items]
Consolidated Net sales	214.9	178.7	567.1	484.6
Performance Chemicals | Oilfield Technologies product line
Disaggregation of Revenue [Line Items]
Consolidated Net sales	32.5	20.3	84	58.1
Performance Chemicals | Pavement Technologies product line
Disaggregation of Revenue [Line Items]
Consolidated Net sales	68.1	64.5	152.2	137.2
Performance Chemicals | Industrial Specialties product line
Disaggregation of Revenue [Line Items]
Consolidated Net sales	$ 114.3	$ 93.9	$ 330.9	$ 289.3

Revenues - Revenue disaggregsat

Revenues - Revenue disaggregsated by geographic area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Consolidated Net sales	$ 311.2	$ 264.1	$ 855	$ 742.9
North America
Disaggregation of Revenue [Line Items]
Consolidated Net sales	220.6		587.3
Asia Pacific
Disaggregation of Revenue [Line Items]
Consolidated Net sales	45		121.9
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Consolidated Net sales	40.5		128.8
South America
Disaggregation of Revenue [Line Items]
Consolidated Net sales	$ 5.1		$ 17

Revenues - Contract assets (Det

Revenues - Contract assets (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Contract with customer, liability	$ 0	$ 0
Change in Contract with Customer, Asset [Roll Forward]
Balance at January 1, 2018	4,400,000
Contract asset additions	12,300,000
Reclassification to accounts receivable, billed to customers	(11,900,000)
Balance at September 30, 2018	$ 4,800,000

Financial Instruments, Risk M_3

Financial Instruments, Risk Management, and Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 500,000		$ 500,000		$ 1,800,000
Equity securities, unrealized gain (loss)	0	$ 0	0	$ (100,000)
Equity Securities without readily determinable fair value	1,500,000		1,500,000		3,000,000
Equity securities without readily determinable fair value impairment	1,500,000
Level 1 to level 2 transfers	0		0
Long-term debt, gross	755,700,000		755,700,000		455,000,000
Restricted investments	70,700,000		70,700,000		71,300,000
Restricted investments, at fair value	66,400,000		66,400,000
Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	7,500,000		7,500,000
Derivative, fair value, net	500,000		500,000
Commodity Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, fair value, net	100,000		100,000		100,000
Swap | Commodity Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	1,300,000		1,300,000
Zero Cost Collar | Commodity Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	1,600,000		1,600,000
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capital lease obligations	80,000,000		80,000,000
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capital lease obligations	88,400,000		88,400,000
Variable Interest Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, gross	370,300,000		370,300,000
Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	286,300,000		286,300,000
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0		0		0
Level 2 | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, fair value, net	$ 500,000		$ 500,000		$ 0

Financial Instruments, Risk M_4

Financial Instruments, Risk Management, and Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Assets:
Equity securities	$ 500,000		$ 500,000		$ 1,800,000
Deferred compensation plan investments	2,300,000		2,300,000
Total assets	3,400,000		3,400,000		1,800,000
Liabilities:
Deferred compensation arrangement	4,500,000		4,500,000		2,000,000
Separation-related reimbursement awards	300,000		300,000		900,000
Total liabilities	4,800,000		4,800,000		2,900,000
Share-based compensation			10,100,000	$ 7,400,000
Level 1
Assets:
Equity securities	500,000		500,000		1,800,000
Deferred compensation plan investments	2,300,000		2,300,000
Total assets	2,800,000		2,800,000		1,800,000
Liabilities:
Deferred compensation arrangement	4,500,000		4,500,000		2,000,000
Separation-related reimbursement awards	300,000		300,000		900,000
Total liabilities	4,800,000		4,800,000		2,900,000
Level 2
Assets:
Equity securities	0		0		0
Deferred compensation plan investments	0		0
Total assets	600,000		600,000		0
Liabilities:
Deferred compensation arrangement	0		0		0
Separation-related reimbursement awards	0		0		0
Total liabilities	0		0		0
Level 3
Assets:
Equity securities	0		0		0
Deferred compensation plan investments	0		0
Total assets	0		0		0
Liabilities:
Deferred compensation arrangement	0		0		0
Separation-related reimbursement awards	0		0		0
Total liabilities	0		0		$ 0
Foreign Exchange Contract | Level 1
Assets:
Derivative	0		0
Foreign Exchange Contract | Level 3
Assets:
Derivative	0		0
Commodity Contract
Assets:
Derivative	100,000		100,000
Commodity Contract | Level 1
Assets:
Derivative	0		0
Commodity Contract | Level 2
Assets:
Derivative	100,000		100,000
Commodity Contract | Level 3
Assets:
Derivative	0		0
Accrued Liabilities
Liabilities:
Share-based compensation	$ 100,000	$ 0	$ 0	$ 300,000

Inventories, net (Details)

Inventories, net (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventory, Net
Raw materials	$ 40.8		$ 40.1
Production materials, stores and supplies	16.8		13.4
Finished and in-process goods	145.2		114.3
Subtotal	202.8		167.8
Less: excess of cost over LIFO cost	(8.5)		(7.8)
Inventories, net	$ 194.3	$ 157.6	$ 160

Property, plant and equipment_3

Property, plant and equipment, net (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment
Total cost	$ 1,037.1	$ 961.3
Less: accumulated depreciation	(538.2)	(522.8)
Property, plant and equipment, net	498.9	438.5
Machinery and equipment
Property, Plant and Equipment
Total cost	835.2	792.5
Buildings and leasehold equipment
Property, Plant and Equipment
Total cost	112.2	115
Land and land improvements
Property, Plant and Equipment
Total cost	19.6	18
Construction in progress
Property, Plant and Equipment
Total cost	$ 70.1	$ 35.8

Goodwill and other intangible_3

Goodwill and other intangible assets, net - Carrying Amount (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Goodwill
Goodwill, beginning balance	$ 12.4
Acquisitions	118.7
Foreign currency translation	(0.5)
Goodwill, ending balance	130.6
Performance Chemicals
Goodwill
Goodwill, beginning balance	8.1
Acquisitions	118.7
Foreign currency translation	(0.5)
Goodwill, ending balance	126.3
Performance Materials
Goodwill
Goodwill, beginning balance	4.3
Acquisitions	0
Foreign currency translation	0
Goodwill, ending balance	$ 4.3

Goodwill and other intangible_4

Goodwill and other intangible assets, net - Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net
Net	$ 129.2	$ 4.9
Performance Chemicals
Finite-Lived Intangible Assets, Net
Gross carrying amount	175.2	42.1
Accumulated amortization	46	37.2
Net	129.2	4.9
Performance Chemicals | Brands
Finite-Lived Intangible Assets, Net
Gross carrying amount	13.9	13.9
Accumulated amortization	12.2	11.8
Net	1.7	2.1
Performance Chemicals | Patents
Finite-Lived Intangible Assets, Net
Gross carrying amount	1.9	0
Accumulated amortization	0.2	0
Net	1.7	0
Performance Chemicals | Customer contracts and relationships
Finite-Lived Intangible Assets, Net
Gross carrying amount	157.2	28.2
Accumulated amortization	33.2	25.4
Net	124	2.8
Performance Chemicals | Non-compete agreements
Finite-Lived Intangible Assets, Net
Gross carrying amount	2.2	0
Accumulated amortization	0.4	0
Net	$ 1.8	$ 0

Goodwill and other intangible_5

Goodwill and other intangible assets, net - Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 3.6	$ 0.6	$ 8.8	$ 1.9
Cost of sales
Finite-Lived Intangible Assets [Line Items]
Amortization expense	0.2	0.3	0.6	1
Selling, general and administrative expenses
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 3.4	$ 0.3	$ 8.2	$ 0.9

Goodwill and other intangible_6

Goodwill and other intangible assets, net - Maturity (Details) $ in Millions	Sep. 30, 2018USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2,018	$ 12.3
2,019	14.3
2,020	13.2
2,021	12.3
2,022	$ 12.2

Debt including capital lease _3

Debt including capital lease obligations - Long-term Debt Including Capital Lease Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Line of Credit Facility
Long-term debt, gross	$ 755.7	$ 455
Less: debt issuance costs	6.8	1.6
Total debt including capital lease obligations, net of debt issuance costs	748.9	453.4
Less: debt maturing within one year	4.9	9.4
Long-term debt including capital lease obligations	$ 744	444
Revolving credit facility
Line of Credit Facility
Interest Rate	3.51%
Long-term debt, gross	$ 0	0
Letters of credit outstanding	1.8
Available under the facility	$ 748.2
Term loan facility
Line of Credit Facility
Interest Rate	3.49%
Long-term debt, gross	$ 375	375
Senior notes
Line of Credit Facility
Interest Rate	4.50%
Long-term debt, gross	$ 300	0
Capital lease obligations
Line of Credit Facility
Interest Rate	7.67%
Long-term debt, gross	$ 80	80
Other
Line of Credit Facility
Interest Rate	5.09%
Long-term debt, gross	$ 0.7	$ 0

Debt including capital lease _4

Debt including capital lease obligations - Narrative (Details)	Aug. 07, 2018USD ($)	Jan. 24, 2018USD ($)	Sep. 30, 2018
Senior notes
Line of Credit Facility
Principal amount		$ 300,000,000
Stated interest rate		4.50%
Deferred finance costs		$ 5,700,000
Proceeds from debt, net of issuance costs		$ 294,300,000
Credit Agreement - Amendment
Line of Credit Facility
Increase in commitments	$ 200,000,000
Commitment fee rate	0.05%
Line of credit facility fees	$ 1,400,000
Amortization rate	1.25%
Revolving Credit Facility
Line of Credit Facility
Leverage ratio			4
Leverage ratio potential increase			4.5
Leverage ratio, interest			3
Minimum | Credit Agreement - Amendment
Line of Credit Facility
Unused commitment fee	0.15%
Minimum | Base Rate | Credit Agreement - Amendment
Line of Credit Facility
Basis spread rate	0.00%
Minimum | LIBOR | Credit Agreement - Amendment
Line of Credit Facility
Basis spread rate	1.00%
Maximum | Credit Agreement - Amendment
Line of Credit Facility
Unused commitment fee	0.30%
Maximum | Base Rate | Credit Agreement - Amendment
Line of Credit Facility
Basis spread rate	0.75%
Maximum | LIBOR | Credit Agreement - Amendment
Line of Credit Facility
Basis spread rate	1.75%

Equity - Rollforward (Details)

Equity - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Stockholders' Equity Attributable to Parent	$ 322.7		$ 322.7		$ 338		$ 263.9
Increase (Decrease) in Stockholders' Equity
Beginning balance (shares)			42,089,103
Net Income (Loss) Attributable to Parent	49.5	$ 33.8	$ 127	$ 84.9
Other comprehensive income (loss)	(3.8)		(6.1)
Exercise of stock options, net			0.2
Tax payments related to vested restricted stock units	(0.6)		(2.1)
Share repurchase program	(9)		(18.1)
Share-based compensation plans	3.8		11.5
Adoption of ASC 606						$ 1.6
Acquisition of noncontrolling interest	$ (55.2)		$ (55.2)
Ending balance (shares)	41,992,323		41,992,323
Ending balance, value	$ 322.7		$ 322.7
Common Stock
Stockholders' Equity Attributable to Parent	$ 0.4		$ 0.4		0.4		0.4
Increase (Decrease) in Stockholders' Equity
Beginning balance (shares)	42,309,000		42,209,000
Common stock issued (shares)	13,000		107,000
Exercise of stock options, net (shares)			6,000
Ending balance (shares)	42,322,000		42,322,000
Additional paid in capital
Stockholders' Equity Attributable to Parent	$ 95.1		$ 95.1		146.9		140.1
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, net			0.2
Share-based compensation plans	3.4		10
Acquisition of noncontrolling interest	(55.2)		(55.2)
Retained earnings
Stockholders' Equity Attributable to Parent	271.4		271.4		221.9		142.8
Increase (Decrease) in Stockholders' Equity
Net Income (Loss) Attributable to Parent	49.5		127
Adoption of ASC 606						$ 1.6
Accumulated other comprehensive income (loss)
Stockholders' Equity Attributable to Parent	(17.8)		(17.8)		(14)		(11.7)
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss)	(3.8)		(6.1)
Treasury stock
Stockholders' Equity Attributable to Parent	(26.4)		(26.4)		$ (17.2)		$ (7.7)
Increase (Decrease) in Stockholders' Equity
Tax payments related to vested restricted stock units	(0.6)		(2.1)
Share repurchase program	(9)		(18.1)
Share-based compensation plans	$ 0.4		$ 1.5

Equity - Noncontrolling Interes

Equity - Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Noncontrolling Interest
Beginning balance	$ 11.3	$ 10.5	$ 14	$ 7.6
Net income (loss) attributable to noncontrolling interests	2.2	4.6	12.7	12.3
Noncontrolling interest distributions	(2.1)	(3.4)	(15.3)	(8.2)
Acquisition of noncontrolling interest	(11.4)	0	(11.4)	0
Ending balance	$ 0	$ 11.7	$ 0	$ 11.7

Equity - Noncontrolling Inter_2

Equity - Noncontrolling Interest Narrative (Details) - USD ($) $ in Millions	Aug. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Acquisition of noncontrolling interest		$ 11.4	$ 0	$ 11.4	$ 0
Acquisition of noncontrolling interest		$ 55.2		$ 55.2
Purification Cellutions LLC
Business Acquisition [Line Items]
Ownership interest	30.00%	30.00%		30.00%
Payments to acquire additional interest	$ 80
Acquisition of noncontrolling interest	11.4
Deferred tax assets assumed	13.4
Acquisition of noncontrolling interest	$ 55.2

Equity - Share Repurchases (Det

Equity - Share Repurchases (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Nov. 01, 2018	Feb. 20, 2017
Equity, Class of Treasury Stock [Line Items]
Common stock amount authorized to be repurchased				$ 100,000,000
Shares repurchased during period (in shares)	93,900	211,000
Weighted average cost per share (in dollars per share)	$ 96.01	$ 85.89
Amount remained unused under repurchase program	$ 75,300,000	$ 75,300,000
Subsequent Event | Common Stock
Equity, Class of Treasury Stock [Line Items]
Common stock amount authorized to be repurchased			$ 350,000,000

Retirement Plans - Summary of C

Retirement Plans - Summary of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pensions
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0.5	$ 0.3	$ 1.3	$ 0.8
Interest cost	0.2	0.2	0.6	0.6
Expected return on plan assets	(0.2)	(0.2)	(0.6)	(0.6)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	0	0.1	0
Net periodic benefit cost (income)	0.5	0.3	1.4	0.8
Other Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	0	0	0
Interest cost	0	0	0	0
Expected return on plan assets	0	0	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	0	0	0
Net periodic benefit cost (income)	$ 0	$ 0	$ 0	$ 0

Retirement Plans - Narrative (D

Retirement Plans - Narrative (Details) $ in Millions	3 Months Ended
	Sep. 30, 2018USD ($)
Postemployment Benefits [Abstract]
Discretionary contribution amount	$ 1.5

Restructuring and other (inco_3

Restructuring and other (income) charges, net - Restructuring (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring and Related Activities [Abstract]
Gain on sale of assets and businesses	$ 0	$ 0	$ (600,000)	$ 0
Severance and other employee-related costs	0	0	0	1,300,000
Other (income) charges, net	0	100,000	0	2,200,000
Total restructuring and other (income) charges, net	$ 0	$ 100,000	$ (600,000)	$ 3,500,000

Restructuring and other (inco_4

Restructuring and other (income) charges, net - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Gain on sale of assets and businesses	$ 0	$ 0	$ 600,000	$ 0
Severance costs	$ 0	0	$ 0	1,300,000
Miscellaneous Exit Costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Severance costs		$ 100,000		$ 2,200,000

Restructuring and other (inco_5

Restructuring and other (income) charges, net - Roll forward of Restructuring Reserve (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Restructuring Reserve
Restructuring reserve, beginning balance	$ 0.2
Change in reserve	0
Cash payments	(0.1)
Other	0
Restructuring reserve, ending balance	$ 0.1

Income taxes - Effective tax ra

Income taxes - Effective tax rate (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Effective Income Tax Rate Reconciliation, Percent
Effective tax rate	24.10%	30.30%	21.60%	31.60%

Income taxes - Tax Reconciliati

Income taxes - Tax Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Before tax
Income (loss) before income taxes	$ 68.1	$ 55.1	$ 178.2	$ 142.1
Separation costs	0	0.2	0	0.7
Restructuring and other (income) charges, net	0	0.1	(0.6)	3.5
Acquisition and other related costs	0	4.1	5.7	4.1
Results of legal entities with full valuation allowances	0	0.5	0	2
Total discrete items	0	4.9	5.1	10.3
Consolidated and combined operations, before discrete items	68.1	60	183.3	152.4
Tax
Tax	16.4	16.7	38.5	44.9
Separation costs, tax	0	0.1	0	0.3
Restructuring & other (income) charges, tax	0	0.1	0	0.7
Acquisition costs, tax	0	1.5	1.3	1.5
Other tax only discrete items	0.2	0.1	0.3	(0.3)
Total discrete items, tax	0.2	1.8	1.6	2.2
Combined operations, before discrete items, tax	$ 16.6	$ 18.5	$ 40.1	$ 47.1
Effective tax rate	24.10%	30.30%	21.60%	31.60%
EAETR	24.40%	30.80%	21.90%	30.90%
Legal and professional service fees	$ 0	$ 4.1	$ 4.3	$ 4.1
Inventory fair value step-up amortization	0	$ 0	$ 1.4	$ 0
Pine Chemical Business
Tax
Legal and professional service fees	4.3
Inventory fair value step-up amortization	$ 1.4

Income taxes - Narrative (Detai

Income taxes - Narrative (Details) $ in Millions	Dec. 31, 2017USD ($)
Income Tax Disclosure [Abstract]
Anticipated decrease in unrecognized tax benefit	$ 24.5

Segment information (Net Sales

Segment information (Net Sales and Segment Operating Profit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Consolidated Net sales	$ 311.2	$ 264.1	$ 855	$ 742.9
Segment Reporting Information, Profit (Loss)
Segment operating profits	76	62.7	205.1	159.7
Separation costs	0	(0.2)	0	(0.7)
Restructuring and other (income) charges	0	(0.1)	0.6	(3.5)
Acquisition and other related costs	0	(4.1)	(5.7)	(4.1)
Interest expense, net	(7.9)	(3.2)	(21.8)	(9.3)
(Provision) benefit for income taxes	(16.4)	(16.7)	(38.5)	(44.9)
Net income (loss) attributable to noncontrolling interests	(2.2)	(4.6)	(12.7)	(12.3)
Net income (loss) attributable to Ingevity stockholders	49.5	33.8	127	84.9
Performance Materials
Segment Reporting Information [Line Items]
Consolidated Net sales	96.3	85.4	287.9	258.3
Segment Reporting Information, Profit (Loss)
Segment operating profits	36.3	29.3	109.8	89.5
Performance Materials | Automotive Technologies product line
Segment Reporting Information [Line Items]
Consolidated Net sales	86.6	75.6	258.6	230.1
Performance Materials | Process Purification product line
Segment Reporting Information [Line Items]
Consolidated Net sales	9.7	9.8	29.3	28.2
Performance Materials | Oilfield Technologies product line
Segment Reporting Information [Line Items]
Consolidated Net sales			84
Performance Materials | Industrial Specialties product line
Segment Reporting Information [Line Items]
Consolidated Net sales			330.9
Performance Materials | Pavement Technologies product line
Segment Reporting Information [Line Items]
Consolidated Net sales			152.2
Performance Chemicals
Segment Reporting Information [Line Items]
Consolidated Net sales	214.9	178.7	567.1	484.6
Segment Reporting Information, Profit (Loss)
Segment operating profits	39.7	33.4	95.3	70.2
Performance Chemicals | Oilfield Technologies product line
Segment Reporting Information [Line Items]
Consolidated Net sales	32.5	20.3	84	58.1
Performance Chemicals | Industrial Specialties product line
Segment Reporting Information [Line Items]
Consolidated Net sales	114.3	93.9	330.9	289.3
Performance Chemicals | Pavement Technologies product line
Segment Reporting Information [Line Items]
Consolidated Net sales	$ 68.1	$ 64.5	$ 152.2	$ 137.2

Segment information (Acquisiton

Segment information (Acquisiton related costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting [Abstract]
Legal and professional service fees	$ 0	$ 4.1	$ 4.3	$ 4.1
Inventory fair value step-up amortization	0	0	1.4	0
Acquisition and other related costs	$ 0	$ 4.1	$ 5.7	$ 4.1

Earnings (loss) per share - Ear

Earnings (loss) per share - Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share Reconciliation
Net income (loss) attributable to Ingevity stockholders	$ 49.5	$ 33.8	$ 127	$ 84.9
Basic and Diluted earnings (loss) per share
Basic earnings (loss) per share attributable to Ingevity stockholders (usd per share)	$ 1.18	$ 0.80	$ 3.02	$ 2.01
Diluted earnings (loss) per share attributable to Ingevity stockholders (usd per share)	$ 1.16	$ 0.79	$ 2.98	$ 2
Shares
Weighted average number of common stock outstanding - Basic	42,037	42,139	42,070	42,137
Weighted average additional shares assuming conversion of potential common stock	620	410	554	383
Shares - diluted basis	42,657	42,549	42,624	42,520

Earnings (loss) per share - Ant

Earnings (loss) per share - Antidilutive (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Potentially anti-dilutive shares (shares)	17	93	77	94