GCP Applied (GCP) 10-Q 6 Nov 20 2020 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2020	Oct. 29, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	1-37533
Entity Registrant Name	GCP Applied Technologies Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-3936076
Entity Address, Address Line One	62 Whittemore Avenue
Entity Address, City or Town	Cambridge
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02140-1623
City Area Code	617
Local Phone Number	876-1400
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	GCP
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		73,058,299
Entity Central Index Key	0001644440
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales		$ 248.4	$ 266.9	$ 660.5	$ 755.2
Cost of goods sold		147	161.8	400.8	468.9
Gross profit		101.4	105.1	259.7	286.3
Selling, general and administrative expenses		65.2	66.3	199	206.7
Research and development expenses		4.5	4.5	13.1	13.8
Interest expense and related financing costs		5.6	5.7	16.3	17.3
Repositioning expenses		0.1	4.4	3.8	15.6
Restructuring expenses and asset impairments		7.7	3.8	11.2	8.8
Gain on sale of corporate headquarters		(110.2)	0	(110.2)	0
Other income, net		(1.8)	(2.2)	(6.7)	(5.7)
Total costs and expenses		(28.9)	82.5	126.5	256.5
Income from continuing operations before income taxes		130.3	22.6	133.2	29.8
(Provision for) benefit from income taxes		(30.6)	(5.5)	(33.2)	5.2
Income from continuing operations		99.7	17.1	100	35
(Loss) income from discontinued operations, net of income taxes		(0.1)	(0.4)	(0.4)	5.9
Net income		99.6	16.7	99.6	40.9
Less: Net income attributable to noncontrolling interests		(0.2)	(0.1)	(0.4)	(0.3)
Net income attributable to GCP shareholders		99.4	16.6	99.2	40.6
Amounts Attributable to GCP Shareholders:
Income from continuing operations attributable to GCP shareholders		99.5	17	99.6	34.7
(Loss) income from discontinued operations, net of income taxes		(0.1)	(0.4)	(0.4)	5.9
Net income attributable to GCP shareholders		$ 99.4	$ 16.6	$ 99.2	$ 40.6
Basic earnings (loss) per share:
Income from continuing operations attributable to GCP shareholders (in usd per share)	[1]	$ 1.36	$ 0.23	$ 1.37	$ 0.48
(Loss) income from discontinued operations, net of income taxes (in usd per share)	[1]	0	(0.01)	(0.01)	0.08
Net income attributable to GCP shareholders (in usd per share)	[1],[2]	$ 1.36	$ 0.23	$ 1.36	$ 0.56
Weighted average number of basic shares (in shares)	[1]	73	72.7	72.9	72.5
Diluted earnings (loss) per share:
Income from continuing operations attributable to GCP shareholders (in dollars per share)	[1]	$ 1.36	$ 0.23	$ 1.36	$ 0.48
(Loss) income from discontinued operations, net of income taxes (in dollars per share)	[1]	0	(0.01)	(0.01)	0.08
Net income attributable to GCP shareholders (in dollars per share)	[1],[2]	$ 1.36	$ 0.23	$ 1.36	$ 0.56
Weighted average number of diluted shares (in shares)	[1]	73.2	72.8	73.1	72.9
[1]	Dilutive effect is only applicable to the periods during which GCP generated net income from continuing operations.
[2]	Amounts may not sum due to rounding.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 99.6	$ 16.7	$ 99.6	$ 40.9
Other comprehensive income (loss):
Defined benefit pension and other postretirement plans, net of income taxes	0.1	0	0.2	0
Currency translation adjustments, net of income taxes	10.8	(14.9)	(18.1)	(15.5)
(Loss) gain from hedging activities, net of income taxes	(0.1)	0.1	0	0
Total other comprehensive income (loss)	10.8	(14.8)	(17.9)	(15.5)
Comprehensive income	110.4	1.9	81.7	25.4
Less: Comprehensive income attributable to noncontrolling interests	(0.2)	(0.1)	(0.4)	(0.3)
Comprehensive income attributable to GCP shareholders	$ 110.2	$ 1.8	$ 81.3	$ 25.1

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 473.4	$ 325
Trade accounts receivable, net of allowance for credit losses of $7.3 million and $7.5 million, respectively	172.8	183.7
Inventories, net	91.3	95.9
Other current assets	39.7	43.7
Total Current Assets	777.2	648.3
Properties and equipment, net	222.4	245.3
Operating lease right-of-use assets	40.5	29.3
Goodwill	206	208.9
Technology and other intangible assets, net	71.9	80.7
Deferred income taxes	9.1	26.1
Overfunded defined benefit pension plans	26.1	25
Other assets	37.4	38
Non-current assets held for sale	0	0.5
Total Assets	1,390.6	1,302.1
Current Liabilities
Debt payable within one year	4.1	2.7
Operating lease obligations payable within one year	7.9	8.1
Accounts payable	83.3	88.4
Other current liabilities	134.7	113.6
Total Current Liabilities	230	212.8
Debt payable after one year	348.8	346.5
Income taxes payable	28.4	41.4
Deferred income taxes	13.5	13.1
Operating lease obligations	25.9	21.6
Unrecognized tax benefits	43.2	42.2
Underfunded and unfunded defined benefit pension plans	57	67.5
Other liabilities	15.9	15.9
Total Liabilities	762.7	761
Commitments and Contingencies - Note 11
Stockholders' Equity
Series A Junior Participating Preferred Stock, par value $0.01; 10,000,000 shares authorized, no shares issued or outstanding (Note 12)	0	0
Common stock issued, par value $0.01; 300,000,000 shares authorized; outstanding: 73,056,914 and 72,850,268, respectively	0.7	0.7
Paid-in capital	60.4	53.4
Accumulated earnings	709.4	610.2
Accumulated other comprehensive loss	(134.9)	(117)
Treasury stock	(10)	(8.6)
Total GCP's Shareholders' Equity	625.6	538.7
Noncontrolling interests	2.3	2.4
Total Stockholders' Equity	627.9	541.1
Total Liabilities and Stockholders' Equity	$ 1,390.6	$ 1,302.1

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for credit losses	$ 7.3	$ 7.5
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	300,000,000	300,000,000
Common stock, outstanding (in shares)	73,056,914	72,850,268
Series A preferred stock
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, outstanding (in shares)	0	0
Preferred Stock, Shares Issued (in shares)	0	0

Consolidated Statements of Equi

Consolidated Statements of Equity (unaudited) - USD ($) $ in Millions		Total	Common Stock		Treasury Stock		Additional Paid-in Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2018			72,400,000		200,000
Beginning balance at Dec. 31, 2018		$ 481.4	$ 0.7		$ (4.8)		$ 39.6	$ 563.9	$ (120)	$ 2
Increase (Decrease) in Stockholders' Equity
Net income		40.9						40.6		0.3
Issuance of common stock in connection with stock plans (in shares)	[1]		300,000
Share-based compensation		7.5					7.5
Exercise of stock options (in shares)	[1]		300,000
Exercise of stock options	[1]	$ 5.1					5.1
Share repurchases (in shares)		130,900			100,000	[2]
Share repurchases	[2]	$ (3.3)			$ (3.3)
Other comprehensive income (loss)		(15.5)							(15.5)
Ending balance (in shares) at Sep. 30, 2019			73,000,000		300,000
Ending balance at Sep. 30, 2019		516.1	$ 0.7		$ (8.1)		52.2	604.5	(135.5)	2.3
Beginning balance (in shares) at Jun. 30, 2019			73,000,000		300,000
Beginning balance at Jun. 30, 2019		512.3	$ 0.7		$ (8)		50.2	587.9	(120.7)	2.2
Increase (Decrease) in Stockholders' Equity
Net income		16.7						16.6		0.1
Share-based compensation		1.9					1.9
Exercise of stock options		0.1					0.1
Share repurchases		(0.1)			$ (0.1)
Other comprehensive income (loss)		(14.8)							(14.8)
Ending balance (in shares) at Sep. 30, 2019			73,000,000		300,000
Ending balance at Sep. 30, 2019		516.1	$ 0.7		$ (8.1)		52.2	604.5	(135.5)	2.3
Beginning balance (in shares) at Dec. 31, 2019			73,200,000		300,000
Beginning balance at Dec. 31, 2019		541.1	$ 0.7		$ (8.6)		53.4	610.2	(117)	2.4
Increase (Decrease) in Stockholders' Equity
Net income		99.6						99.2		0.4
Issuance of common stock in connection with stock plans (in shares)	[1]		200,000
Share-based compensation	[3]	$ 5.9					5.9
Exercise of stock options (in shares)		64,000	100,000	[1]
Exercise of stock options	[1]	$ 1.1					1.1
Share repurchases (in shares)		62,200			100,000	[2]
Share repurchases	[2]	$ (1.4)			$ (1.4)
Other comprehensive income (loss)		(17.9)							(17.9)
Dividends and other changes in noncontrolling interest		(0.5)								(0.5)
Ending balance (in shares) at Sep. 30, 2020			73,500,000		400,000
Ending balance at Sep. 30, 2020		627.9	$ 0.7		$ (10)		60.4	709.4	(134.9)	2.3
Beginning balance (in shares) at Jun. 30, 2020			73,300,000		400,000
Beginning balance at Jun. 30, 2020		515.2	$ 0.7		$ (8.9)		56.9	610	(145.7)	2.2
Increase (Decrease) in Stockholders' Equity
Net income		99.6						99.4		0.2
Issuance of common stock in connection with stock plans (in shares)			100,000
Share-based compensation		3.1					3.1
Exercise of stock options		0.4					0.4
Share repurchases		(1.1)			$ (1.1)
Other comprehensive income (loss)		10.8							10.8
Ending balance (in shares) at Sep. 30, 2020			73,500,000		400,000
Ending balance at Sep. 30, 2020		$ 627.9	$ 0.7		$ (10)		$ 60.4	$ 709.4	$ (134.9)	$ 2.3
[1]	The par value of common shares issued may not be included in the table due to rounding. Total share amounts for common stock and treasury stock may not sum due to rounding.
[2]	Refer to Note 15, “Stock Incentive Plans”, for further information.
[3]	During the nine months ended September 30, 2020, $1.8 million of the stock-based compensation expense is included in "Restructuring expenses and asset impairments" related to accelerated vesting of stock options and RSUs due to the CEO's departure from the Company effective September 11, 2020 following Board approval.

Consolidated Statements of Eq_2

Consolidated Statements of Equity (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total stock compensation (benefit) expense	$ 3.3	$ 2.3	$ 5.6	$ 7.3
2019 Phase 2 Plan
Total stock compensation (benefit) expense	$ 1.8

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
OPERATING ACTIVITIES
Net income	$ 99.6	$ 40.9
Less: (Loss) income from discontinued operations	(0.4)	5.9
Income from continuing operations	100	35
Reconciliation to net cash provided by operating activities:
Depreciation and amortization	34.5	31.6
Amortization of debt discount and financing costs	1.1	1.1
Stock-based compensation expense	3.8	7.3
Unrealized loss on foreign currency	2.7	1
Deferred income taxes	21.1	(12.4)
(Gain) loss on disposal of property and equipment	(109.7)	0.1
Changes in assets and liabilities, excluding effect of currency translation:
Trade accounts receivable	8.6	7.2
Inventories	3.2	(0.3)
Accounts payable	(3.9)	(13.6)
Pension assets and liabilities, net	(12.4)	4.1
Other assets and liabilities, net	10.3	(14.6)
Net cash provided by operating activities from continuing operations	59.3	46.5
Net cash used in operating activities from discontinued operations	(2.5)	(13)
Net cash provided by operating activities	56.8	33.5
INVESTING ACTIVITIES
Capital expenditures	(28)	(46)
Proceeds from sale of corporate headquarters, net of transaction costs	122.5	0
Other investing activities	0.4	0.4
Net cash provided by (used in) investing activities from continuing operations	94.9	(45.6)
Net cash used in investing activities from discontinued operations	0	(0.4)
Net cash provided by (used in) investing activities	94.9	(46)
FINANCING ACTIVITIES
Borrowings under credit arrangements	1.5	0
Repayments under credit arrangements	0	(7.6)
Payments on finance lease obligations	(0.6)	(0.6)
Payments of tax withholding obligations related to employee equity awards	(0.4)	(3.3)
Proceeds from exercise of stock options	1.1	5.1
Payments of dividends to noncontrolling interests	(0.5)	0
Other financing activities	(0.4)	(0.4)
Net cash provided by (used in) financing activities from continuing operations	0.7	(6.8)
Effect of currency exchange rate changes on cash and cash equivalents	(4)	(3)
Increase (decrease) in cash and cash equivalents	148.4	(22.3)
Cash and cash equivalents, beginning of period	325	326.1
Cash and cash equivalents, end of period	473.4	303.8
Supplemental disclosure of non-cash investing activities:
Property and equipment purchases unpaid and included in accounts payable	$ 4.9	$ 8.9

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies	Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies GCP is engaged in the production and sale of specialty construction chemicals and specialty building materials through two operating segments. Specialty Construction Chemicals ("SCC") manufactures and markets concrete admixtures and cement additives and supplies in-transit monitoring systems for concrete producers. Specialty Building Materials ("SBM") manufactures and markets sheet and liquid membrane systems that protect structures from water, air and vapor penetration, fireproofing and other products designed to protect the building envelope. On July 3, 2017 (the "Closing Date"), GCP completed the sale of its Darex Packaging Technologies ("Darex") business to Henkel AG & Co. KGaA (“Henkel”) for $1.06 billion in cash. As discussed further below under "Discontinued Operations," the results of operations for Darex have been excluded from GCP's continuing operations and segment results for all periods presented. Basis of Presentation The accompanying unaudited Consolidated Financial Statements are presented on a consolidated basis and include all of the accounts and operations of GCP and its majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The financial statements reflect the financial position, results of operations and cash flows of GCP in accordance with generally accepted accounting principles in the United States ("GAAP") and with the instructions to Form 10-Q and Article 10 of SEC Regulation S-X for interim financial information. The interim financial statements presented herein are unaudited and should be read in conjunction with the audited Consolidated Financial Statements and notes thereto contained in GCP's Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2019 (the "2019 Annual Report on Form 10-K"). The Consolidated Balance Sheet as of December 31, 2019 was derived from the audited annual consolidated financial statements as of the period then ended. Certain information and footnote disclosures typically included in GCP's annual consolidated financial statements have been condensed or omitted. The unaudited financial statements reflect all adjustments that, in the opinion of management, are necessary for a fair statement of the results of the interim periods presented. All such adjustments are of a normal recurring nature except for the impacts of adopting new accounting standards discussed below. The results of operations for the three and nine months ended September 30, 2020 are not necessarily indicative of the results of operations for the year ending December 31, 2020. Discontinued Operations On July 3, 2017, the Company completed the sale of Darex to Henkel. The agreement with Henkel governing the Disposition (the “Amended Purchase Agreement”) provides for a series of delayed closings in certain non-U.S. jurisdictions. In conjunction with this transaction and applicable GAAP, the assets and liabilities related to Darex in the applicable delayed close countries have been reclassified and reflected as held for sale in the accompanying unaudited Consolidated Balance Sheets as of December 31, 2019, as discussed further in Note 19, "Discontinued Operations." Additionally, Darex results of operations and cash flows have been reclassified and reflected as "discontinued operations" in the accompanying unaudited Consolidated Statements of Operations and unaudited Consolidated Statements of Cash Flows for all periods presented. Unless otherwise noted, the information throughout the Notes to the accompanying unaudited Consolidated Financial Statements pertains only to the continuing operations of GCP. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the unaudited Consolidated Financial Statements, and the reported amounts of revenues and expenses for the periods presented. The Company assesses the estimates on an ongoing basis and records changes in estimates in the period they occur and become known. GCP's accounting measurements that are most affected by management's estimates of future events are disclosed in its 2019 Annual Report on Form 10-K. Actual results could differ from those estimates. On March 11, 2020, the World Health Organization declared the outbreak of the novel strain of coronavirus ("COVID-19") a global pandemic and recommended a number of restrictive measures to contain the spread. Many governments in the regions where GCP generates the majority of its revenue have adopted such policies, including social distancing and restrictions on construction activities deemed non-essential. GCP has been closely monitoring the impact of COVID-19 and working to manage the effects on its business globally. While certain restrictive measures in some of the regions where GCP operates have been lifted by government authorities, it is difficult to estimate with reasonable certainty at this time the duration and extent of the impact of the pandemic on the global economy, the Company's business, financial position and results of operations. GCP has made certain estimates within its financial statements related to the impact of COVID-19, including allowances for credit losses related to the estimated amount of receivables not expected to be collected and excess, obsolete or damaged inventories, future expected cash flows related to impairment assessments of goodwill and long-lived assets, incentive compensation accruals, contingent liabilities, and sales allowances related to volume rebates recognized based on anticipated sales volume. There may be changes to the Company's estimates in future periods due to uncertainty associated with the impact of COVID-19, the extent of which will depend largely on future developments, including new information which may emerge concerning the severity, duration and resurgence of the pandemic, additional and unanticipated actions by government authorities to further contain the spread of COVID-19 or address its impact, as well as the timing of development of an antiviral vaccine or a medical treatment to prevent further spread of the virus and facilitate recovery, among other things. Income Tax As a global enterprise, GCP is subject to a complex array of tax regulations and needs to make assessments of applicable tax law and judgments in estimating its ultimate income tax liability. Income tax expense and income tax balances represent GCP’s federal, state and foreign income taxes as an independent company. GCP files a U.S. consolidated income tax return, along with foreign and state corporate income tax filings, as required. Please refer to Note 8, "Income Taxes," for details regarding estimates used in accounting for income tax matters, including unrecognized tax benefits. Foreign Currency Transactions and Translation Certain transactions of the Company and its subsidiaries are denominated in currencies other than their functional currency. Foreign currency exchange gains (losses) generated from the settlement and remeasurement of these transactions are recognized in earnings and presented within “Other income, net” in the Company’s accompanying unaudited Consolidated Statements of Operations. Net foreign currency transaction and remeasurement gains (losses) reflected in “Other income, net” were $0.9 million and $1.7 million for the three and nine months ended September 30, 2020. Net foreign currency transaction and remeasurement gains (losses) were immaterial for the three and nine months ended September 30, 2019. GCP continues to account for its operations in Argentina as a highly inflationary economy. Losses related to the remeasurement of the monetary assets and liabilities of the subsidiary operating in Argentina are included in "Other income, net" in the accompanying unaudited Consolidated Statements of Operations and were immaterial during the three and nine months ended September 30, 2020. Losses incurred during the three and nine months ended September 30, 2019 were $0.6 million and $0.9 million, respectively. Reclassifications Certain amounts in prior period financial statements have been reclassified to conform to the current period presentation. Such reclassifications have not materially affected previously reported amounts. Recently Adopted Accounting Standards Credit Losses In June 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2016-13, Financial Instruments- Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which applies to most financial assets measured at amortized cost, as well as certain other instruments, including trade receivables, other receivables and other financial assets. Topic 326 replaces the incurred credit loss methodology with the expected credit loss model which requires recognition of an allowance against the assets’ amortized cost to reflect the amount expected to be collected. Expected credit losses are estimated over the contractual life of financial assets and recognized at inception. GCP has adopted Topic 326 effective January 1, 2020 using the modified retrospective approach. The adoption did not have a material impact on its financial position as of September 30, 2020 and results of operations and cash flows for the three and nine months ended September 30, 2020. GCP did not recognize any cumulative effect adjustments to the retained earnings as of January 1, 2020 as a result of the adoption. The adoption of Topic 326 did not result in any significant modifications to the Company's policies related to recognizing allowance for trade receivables not expected to be collected which are disclosed in Note 1, "Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies," to the Company’s Consolidated Financial Statements included in the 2019 Annual Report on Form 10-K. Please refer to Note 3, "Accounts Receivable, Allowance for Credit Losses" for further information on the Company's policies and methodologies resulting from the adoption. Goodwill In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350) . The amendments in this update eliminate the requirement to calculate the implied fair value of goodwill (Step 2) when measuring a goodwill impairment loss which is based on the excess of a reporting unit’s carrying amount over its fair value. The standard is effective for the Company for its annual or any interim goodwill impairment tests to be performed beginning on or after January 1, 2020. GCP adopted the standard effective January 1, 2020. The adoption did not have a material impact on its financial position, results of operations and cash flows upon adoption. Other During the three and nine months ended September 30, 2020, except as discussed above, there were no material changes to the Company's significant accounting and financial reporting policies from those reflected in the Annual Report on Form 10-K for the year ended December 31, 2019. For further information with regard to the Company’s Significant Accounting Policies, please refer to Note 1, "Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies," to the Company’s Consolidated Financial Statements included in the 2019 Annual Report on Form 10-K.

Revenue from Lessor Arrangement

Revenue from Lessor Arrangements and Contracts with Customers	9 Months Ended
	Sep. 30, 2020
Revenues [Abstract]
Revenue from Lessor Arrangements and Contracts with Customers	Revenue from Lessor Arrangements and Contracts with Customers The majority of the Company’s revenue is generated from short-term arrangements associated with the production and sale of concrete admixtures and cement additives within its SCC operating segment, as well as sheet and liquid membrane systems and other specialty products designed to protect the building envelope within its SBM operating segment. For such arrangements, the transfer of control takes place at a point in time when products are shipped to the customer. Short-term arrangements within its SCC operating segment involve selling concrete admixtures and providing dispensers to customers. Such arrangements contain a lease element due to the customer's right to control the use of dispensers over a period of time in exchange for consideration. Dispenser leases have a non-cancelable lease term of thirty days or less. The Company classifies leases as operating and recognizes revenue on a straight line basis over the lease term. Revenue for concrete admixtures is recognized at the point of time when control is transferred to the customer. The Company generates revenue from long-term arrangements within its SCC operating segment, which generally consist of VERIFI ® and Ductilcrete sales arrangements. VERIFI ® sales arrangements involve installing equipment on the customers’ trucks and at their plants, as well as performing slump management and truck location tracking services. The installed equipment represents a lease since the customer has the right to control its use over a period of time in exchange for consideration. Slump management and truck location tracking services represent a separate performance obligation for which revenue is recognized over the performance period. The Company classifies these leases as operating leases and recognizes revenue on a straight line basis over the lease term. The transaction price in VERIFI ® sales arrangements consists of fixed installation fees and other fixed payments included in the contract consideration, as well as slump management fees which are dependent on the quantity of material poured and represent variable consideration. The Company allocates the contract consideration and the variable consideration between the lease element and the services based on their relative stand-alone selling prices. Revenue related to variable consideration is recorded at the time the services are performed and constrained by the amount for which a significant revenue reversal is not probable to occur. Revenue generated from VERIFI ® sales arrangements represented less than 10% of the Company's consolidated revenue during the three and nine months ended September 30, 2020 and 2019. The following table summarizes the revenue recognized for these sales arrangements for the three and nine months ended September 30, 2020 and 2019 and distinguishes between the lease and the service revenue: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Lease revenue (1): Lease payments revenue $ 7.1 $ 6.5 $ 20.9 $ 19.7 Variable lease revenue 2.8 2.1 7.5 5.6 Total lease revenue $ 9.9 $ 8.6 $ 28.4 $ 25.3 Service revenue (2): Fixed fee revenue $ 0.4 $ — $ 0.8 $ 0.1 Variable fee revenue 1.7 1.4 4.6 3.4 Total service revenue $ 2.1 $ 1.4 $ 5.4 $ 3.5 Total revenue $ 12.0 $ 10.0 $ 33.8 $ 28.8 ________________________________ (1) Lease revenue consists of dispenser lease revenue, as well as an allocated portion of VERIFI ® fixed fees and variable slump management fees. Lease revenue is included within "Net Sales" in the accompanying unaudited Consolidated Statements of Operations. (2) Service revenue consists of an allocated portion of VERIFI ® fixed fees and variable slump management fees. Service revenue is included within "Net Sales" in the accompanying unaudited Consolidated Statements of Operations. As of September 30, 2020 and December 31, 2019, the Company’s total trade accounts receivable balance was $172.8 million and $183.7 million, respectively, of which $5.9 million and $5.6 million, respectively, was related to trade accounts receivable associated with lease revenue generated from certain SCC contracts. The future minimum lease payments receivable under the operating leases were not material as of September 30, 2020. Revenue generated from Ductilcrete sales arrangements represented less than 10% of the Company's consolidated revenue during the three and nine months ended September 30, 2020 and 2019. The Company’s revenue is principally recognized as goods and services are delivered and performance obligations are satisfied upon delivery. The Company has certain long-term arrangements resulting in remaining obligations for which the work has not been performed or has been partially performed. As of September 30, 2020, the aggregate amount of the transaction price allocated to remaining performance obligations was $9.5 million, including the estimated transaction price to be earned as revenue over the remaining term of these contracts, which is generally one For further information on revenue recognition related to product sale arrangements, please refer to Note 2, "Revenue from Lessor Arrangements and Contracts with Customers", to the Company’s Consolidated Financial Statements included in the 2019 Annual Report on Form 10-K.

Accounts Receivable, Allowance

Accounts Receivable, Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
Accounts Receivable, Allowance for Credit Losses	Accounts Receivable, Allowance for Credit Losses Trade accounts receivable are amounts due from customers for products sold or services performed in the ordinary course of business and are stated at their estimated net realizable value representing amounts expected to be collected. Allowance for credit losses is recorded upon the initial recognition of trade accounts receivable and reviewed during each reporting period over their contractual life. Allowance for credit losses is measured based on historical loss rates and the impact of current and future conditions, including an assessment of customer creditworthiness, historical payment experience, the age of outstanding receivables and collateral to the extent applicable. The Company evaluates the allowance for credit losses for the entire portfolio of trade accounts receivable on an aggregate basis due to similar risk characteristics of its customers based on similar industry and historical loss patterns. Accounts receivable balances are written off against the allowance for credit losses when the Company determines that the balances are not recoverable. Provisions for expected credit losses are recorded in "Selling, general and administrative expenses" in the accompanying unaudited Consolidated Statements of Operations. As of September 30, 2020 and December 31, 2019, allowance for credit losses was $7.3 million and $7.5 million, respectively. The following table summarizes the activity for the allowance for credit losses during the three and nine months ended September 30, 2020 and 2019: (In millions) Three months ended September 30, Nine months ended September 30, 2020 2019 2020 2019 Beginning balance $ 7.3 $ 6.3 $ 7.5 $ 5.8 Provision for expected credit losses 0.3 0.6 1.0 2.1 Write offs (0.4) (0.2) (0.9) (1.2) Foreign currency translation adjustments 0.1 (0.2) (0.3) (0.2) Ending balance $ 7.3 $ 6.5 $ 7.3 $ 6.5

Inventories, net

Inventories, net	9 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Inventories, net	Inventories, net The following is a summary of inventories presented in the accompanying unaudited Consolidated Balance Sheets at September 30, 2020 and December 31, 2019: (In millions) September 30, December 31, Raw materials $ 39.3 $ 40.0 In process 4.6 4.0 Finished products and other 47.4 51.9 Total inventories, net $ 91.3 $ 95.9

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments The Company uses derivative instruments to partially offset its business exposure to foreign currency risk on net investments in certain foreign subsidiaries. The Company enters into foreign currency forward contracts to offset a portion of the changes in the carrying amounts of its net investments in foreign operations due to fluctuations in foreign currency exchange rates. As of September 30, 2020, the Company was a party to four forward contracts with an aggregate notional amount of €40.0 million to hedge foreign currency exposure on net investments in certain of its European subsidiaries whose functional currency is the Euro. These forward contracts are designated as hedging instruments and recognized at fair value as assets or liabilities in the accompanying unaudited Consolidated Balance Sheets. Each contract has a notional amount of €10.0 million and matures annually starting on June 14, 2021 through June 17, 2024. During the nine months ended September 30, 2020, GCP settled one contract with a notional amount of €10.0 million upon its maturity and entered into a new contract with a notional amount of €10.0 million maturing on June 17, 2024. The forward contracts are designated and qualify as net investment hedges for which effectiveness is assessed based on the spot rate method. Please refer to Note 4, "Derivative Instruments", to the Company’s Consolidated Financial Statements included in the 2019 Annual Report on Form 10-K for further information on net investment hedges. The following table summarizes the fair value of the Company’s derivative instruments designated as net investment hedges as of September 30, 2020 and December 31, 2019: (In millions) September 30, 2020 December 31, 2019 Derivative assets (1) : Foreign exchange forward contracts $ 0.7 $ 1.1 Derivative liability (1) : Foreign exchange forward contracts $ (0.6) $ — __________________________ (1) The fair value of derivative instruments is measured based on expected future cash flows discounted at market interest rates using observable market inputs and classified as Level 2 within the fair value hierarchy. As of September 30, 2020, fair value of derivative assets of $0.1 million and $0.6 million, respectively, is recorded within "Other Current Assets" and "Other Assets" in the accompanying unaudited Consolidated Balance Sheets, and fair value of derivative liability is recorded within "Other Liabilities" in the accompanying unaudited Consolidated Balance Sheets. As of December 31, 2019, fair value of derivative assets of $0.3 million and $0.8 million, respectively, is recorded within "Other Current Assets" and "Other Assets" in the accompanying unaudited Consolidated Balance Sheets. The following table summarizes the amounts recorded in the Company's accompanying unaudited Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income (Loss) related to forward contracts designated as net investment hedges for the three and nine months ended September 30, 2020 and 2019: (In millions) Three Months Ended September 30, 2020 Three Months Ended September 30, 2019 Other Income, net Cumulative Translation Adjustments (1) Other Income, net Cumulative Translation Adjustments (1) Gains (losses) on foreign exchange forward contracts $ 0.2 $ (1.5) $ 0.2 $ 1.5 (In millions) Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Other Income, net Cumulative Translation Adjustments (1) Other Income, net Cumulative Translation Adjustments (1) Gains (losses) on foreign exchange forward contracts $ 0.8 $ (1.0) $ 0.3 $ 1.3 __________________________ (1) The amounts are presented net of tax benefit of $0.5 million and $0.3 million, respectively, for the three and nine months ended September 30, 2020. The amounts are presented net of tax liability of $0.5 million and $0.4 million, respectively, for the three and nine months ended September 30, 2019.

Debt and Other Borrowings

Debt and Other Borrowings	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Debt and Other Borrowings	Debt and Other Borrowings Components of Debt and Other Borrowings The following is a summary of obligations under senior notes and other borrowings at September 30, 2020 and December 31, 2019: (In millions) September 30, December 31, 5.5% Senior Notes due in 2026, net of unamortized debt issuance costs of $3.5 million and $3.9 million, respectively, at September 30, 2020 and December 31, 2019 $ 346.5 $ 346.1 Revolving credit facility due 2023 (1) — — Other borrowings (2) 6.4 3.1 Total debt 352.9 349.2 Less: debt payable within one year 4.1 2.7 Debt payable after one year $ 348.8 $ 346.5 Weighted average interest rates on total debt obligations 5.5 % 5.5 % __________________________ (1) Represents borrowings under the Revolving Credit Facility with an aggregate available principal amount of $350.0 million as of September 30, 2020 and December 31, 2019. (2) Represents borrowings of $3.5 million and $1.8 million, respectively, at September 30, 2020 and December 31, 2019, under various lines of credit and other borrowings, primarily by non-U.S. subsidiaries, as well as $2.9 million and $1.3 million, respectively, of finance lease obligations. The principal maturities of debt obligations outstanding, net of debt issuance costs, were as follows at September 30, 2020: (In millions) Amount Remainder of 2020 $ 3.7 2021 0.7 2022 0.7 2023 0.7 2024 0.5 Thereafter 346.6 Total debt $ 352.9 5.5% Senior Notes GCP's outstanding 5.5% Senior Notes have an aggregate principal amount of $350.0 million maturing on April 15, 2026. Interest on the 5.5% Senior Notes is payable semi-annually in arrears on April 15 and October 15 of each year. The Company made an interest payment of $9.6 million on April 15, 2020 and October 15, 2020. The Indenture contains certain customary affirmative and negative covenants and events of default, as described in Note 8, "Debt and Other Borrowings," to the Company's Consolidated Financial Statements included in the 2019 Annual Report in the Form 10-K. The Company was in compliance with all covenants and conditions under the Indenture as of September 30, 2020. There are no events of default under the Indenture as of September 30, 2020. Credit Agreement As of September 30, 2020 and December 31, 2019, there were no outstanding borrowings on the Revolving Credit Facility. There were $2.6 million and $5.9 million, respectively, in outstanding letters of credit which resulted in available credit of $347.4 million and $344.1 million, respectively. There were no interest payments on the Revolving Credit Facility during the three and nine months ended September 30, 2020. The interest rate per annum applicable to the Revolving Credit Facility is equal to, at GCP’s option, either: (i) a base rate plus a margin ranging from 0.5% to 1.0%, or (ii) LIBOR plus a margin ranging from 1.5% to 2.0%, based upon the total leverage ratio of GCP and its restricted subsidiaries in both scenarios. The Credit Agreement contains conditions that would require mandatory principal payments in advance of the maturity date of the Revolving Credit Facility, as well as certain customary affirmative and negative covenants and events of default, as described in Note 8, "Debt and Other Borrowings," to the Company's Consolidated Financial Statements included in the 2019 Annual Report in the Form 10-K. The Company was in compliance with all covenant terms as of September 30, 2020. There are no events of default as of September 30, 2020. Debt Issuance Costs GCP recognizes expenses directly associated with obtaining the Revolving Credit Facility as debt issuance costs which are presented within "Other assets" in the accompanying unaudited Consolidated Balance Sheets. Such costs are amortized over the term of the Revolving Credit Facility and included in “Interest expense and related financing costs” in the accompanying unaudited Consolidated Statements of Operations. As of September 30, 2020 and December 31, 2019, the remaining unamortized debt issuance costs related to the Revolving Credit Facility were $2.4 million and $3.1 million, respectively. Debt Fair Value The carrying amount and fair value of GCP's debt and other borrowings were as follows: September 30, 2020 December 31, 2019 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value 5.5% Senior Notes due in 2026 $ 346.5 $ 357.5 $ 346.1 $ 366.3 Other borrowings 6.4 6.4 3.1 3.1 Total debt $ 352.9 $ 363.9 $ 349.2 $ 369.4 Fair value is determined based on Level 2 inputs, including expected future cash flows (discounted at market interest rates), estimated current market prices, and quotes from financial institutions. As of September 30, 2020, the fair value was higher than the carrying amount due to higher bond market prices. The carrying amount represents the aggregate principal amount at maturity reduced by the unamortized debt issuance costs.

Lessee Arrangements

Lessee Arrangements	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Lessee Arrangements	Lessee Arrangements The Company leases manufacturing and office facilities, as well as certain vehicles and equipment under operating leases. The following table summarizes components of lease expense for the three and nine months ended September 30, 2020 and 2019: Three months ended September 30, Nine months ended September 30, (In millions) 2020 2019 2020 2019 Operating lease expense $ 3.7 $ 2.9 $ 9.9 $ 9.3 Variable lease expense 1.9 1.0 4.3 3.5 Short-term lease expense 0.7 0.7 2.1 1.6 Total lease expense $ 6.3 $ 4.6 $ 16.3 $ 14.4 The following table summarizes supplemental cash flow information related to leases during the nine months ended September 30, 2020 and 2019: Nine months ended September 30, (In millions) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 8.8 $ 9.4 Operating lease right of use assets obtained in exchange for new lease obligations: Upon adoption of Topic 842 $ — $ 40.8 During the current period 12.9 3.7 Total $ 12.9 $ 44.5 On July 31, 2020, GCP sold its corporate headquarters located at 62 Whittemore Avenue, Cambridge, Massachusetts to IQHQ, L.P and entered into a leaseback transaction with the buyer in conjunction with the sale. The lease of GCP's corporate headquarters is classified as an operating lease and has an initial rent-free term of eighteen months. Fair value of free rent of $8.6 million was recognized as an Operating Lease Right-of-Use Asset as a result of a non-cash transaction. Please refer to Note 10, "Other Balance Sheet Information" for further information.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes attributable to continuing operations during the three months ended September 30, 2020 and 2019 was an income tax expense of $30.6 million and $5.5 million, respectively, representing effective tax rates of 23.5% and 24.3%, respectively. The difference between the U.S. federal income tax rate of 21.0% and GCP’s overall income tax rate for the three months ended September 30, 2020 was primarily due to state income tax expense from the sale of the Cambridge site of $5.1 million, tax expense due to non-deductible expenses and the effect of tax rates in foreign jurisdictions of $3.7 million, partially offset by tax benefits related to the 2017 Tax Act final regulations and the CARES Act of $5.8 million. The difference between the U.S. federal income tax rate of 21.0% and GCP's overall income tax rate for the three months ended September 30, 2019 was primarily due to tax expenses for non-deductible expenses and the effect of tax rates in foreign jurisdictions, partially offset by a benefit from Brazilian income tax refunds. Income taxes attributable to continuing operations during the nine months ended September 30, 2020 and 2019 was an income tax expense of $33.2 million and an income tax benefit of $5.2 million, respectively, representing effective tax rates of 24.9% and 17.4%, respectively. The difference between the U.S. federal income tax rate of 21.0% and GCP’s overall income tax rate for the nine months ended September 30, 2020 was primarily due to state income tax expense from the sale of the Cambridge site of $5.1 million, tax expenses for non-deductible expenses and the effect of tax rates in foreign jurisdictions of $4.2 million, partially offset by tax benefits related to the 2017 Tax Act final regulations and the CARES Act of $6.3 million. The difference between the U.S. federal income tax rate of 21.0% and GCP's overall income tax rate for the nine months ended September 30, 2019 was primarily due to the finalization of the Transition Tax regulations issued in January 2019, resulting in a tax benefit from the reversal of unrecognized tax benefits in the amount of $20.2 million, an income tax benefit of $3.0 million relating to Brazilian income tax refunds, partially offset by a tax expense of $3.6 million on changes to GCP’s 2017 income tax liability and Transition Tax . Tax Reform As a result of the additional deductions and net operating loss carryback allowable to GCP under the CARES Act, GCP decreased its outstanding Transition Tax liability by $13.0 million during the nine months ended September 30, 2020. GCP had previously elected to pay the Transition Tax over the eight-year period as provided in the 2017 Tax Act. As of September 30, 2020, the unpaid balance of the Transition Tax obligation is $28.4 million, net of overpayments and foreign tax credits. After considering overpayments, the outstanding payable is due between April 2023 and April 2025. During the year ended December 31, 2018, GCP recorded a $20.2 million liability for an unrecognized tax benefits related to certain capital gains recognized as a result of the application of the Transition Tax. As a result of clarifications contained in final regulations issued by the IRS in January 2019, GCP decreased its liability for unrecognized tax benefits by $20.2 million during the three months ended March 31, 2019. For additional information related to the 2017 Tax Act, please refer to Note 9, "Income Taxes," to the Company's Consolidated Financial Statements included in the 2019 Annual Report on Form 10-K. Repatriation In general, it is GCP's practice and intention to permanently reinvest the earnings of its foreign subsidiaries and repatriate earnings only when the tax impact is efficient. Valuation Allowance In evaluating GCP's ability to realize its deferred tax assets, GCP considers all reasonably available positive and negative evidence, including recent earnings experience, expectations of future taxable income and the tax character of that income, the period of time over which temporary differences become deductible and the carryforward and/or carryback periods available to GCP for tax reporting purposes in the related jurisdiction. In estimating future taxable income, GCP relies upon assumptions and estimates about future activities, including the amount of future federal, state and foreign pretax operating income that GCP will generate; the reversal of temporary differences; and the implementation of feasible and prudent tax planning strategies. GCP records a valuation allowance to reduce deferred tax assets to the amount that it believes is more likely than not to be realized. Income tax expense for valuation allowances was $0.1 million for the three months ended September 30, 2020 and an income tax benefit of $0.1 million for the three months ended September 30, 2019. During the nine months ended September 30, 2020 and 2019, GCP incurred income tax expense for valuation allowances of $1.0 million and $0.4 million, respectively, recorded against deferred tax assets for net operating losses incurred primarily in Argentina, Australia and India. Tax Sharing Agreement In connection with the Separation, GCP and Grace entered into various agreements that govern the relationship between the parties going forward, including a tax matters agreement (the "Tax Sharing Agreement"). Under the Tax Sharing Agreement, GCP and Grace will indemnify and hold each other harmless in accordance with the principles outlined therein. Please refer to Note 17, "Related Party Transactions and Transactions with Grace" for further information on the Tax Sharing Agreement.

Pension Plans and Other Postret

Pension Plans and Other Postretirement Benefit Plans	9 Months Ended
	Sep. 30, 2020
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Pension Plans and Other Postretirement Benefit Plans	Pension Plans and Other Postretirement Benefit Plans Pension Plans GCP sponsors defined benefit pension plans, primarily in the U.S. and the U.K., in which GCP employees and former employees participate. GCP records an asset or a liability to recognize the funded status of these pension plans in its accompanying unaudited Consolidated Balance Sheets. The following table presents the funded status of GCP's overfunded, underfunded and unfunded defined pension plans: (In millions) September 30, 2020 December 31, 2019 Overfunded defined benefit pension plans $ 26.1 $ 25.0 Underfunded defined benefit pension plans (30.1) (40.8) Unfunded defined benefit pension plans (26.9) (26.7) Total underfunded and unfunded defined benefit pension plans (57.0) (67.5) Pension liabilities included in other current liabilities (0.7) (1.2) Net funded status $ (31.6) $ (43.7) Components of Net Periodic Benefit Cost The components of GCP's net periodic benefit cost for the three and nine months ended September 30, 2020 and 2019 are as follows: Three Months Ended September 30, 2020 2019 Pension Pension (In millions) U.S. Non-U.S. U.S. Non-U.S. Service cost $ 1.5 $ 0.3 $ 1.6 $ 0.7 Interest cost 1.3 1.0 1.4 1.4 Expected return on plan assets (1.6) (1.2) (1.6) (1.5) Net periodic benefit cost (1) $ 1.2 $ 0.1 $ 1.4 $ 0.6 Nine Months Ended September 30, 2020 2019 Pension Pension (In millions) U.S. Non-U.S. U.S. Non-U.S. Service cost $ 4.6 $ 0.7 $ 4.8 $ 2.0 Interest cost 3.8 3.1 4.3 4.1 Expected return on plan assets (4.9) (3.5) (4.8) (4.5) Amortization of prior service cost — 0.1 — — Net periodic benefit cost (1) $ 3.5 $ 0.4 $ 4.3 $ 1.6 ________________________________ (1) Service cost component of net periodic benefit cost is included in "Selling, general and administrative expenses" and "Cost of goods sold" in the accompanying unaudited Consolidated Statements of Operations. All other components of net periodic benefit costs are presented in "Other income, net," within the accompanying unaudited Consolidated Statements of Operations. Other Postretirement Benefit (OPEB) Plans GCP provides postretirement health care benefits for certain qualifying retired employees. As of September 30, 2020 and December 31, 2019, the related long-term liability was $2.2 million. As of September 30, 2020 and December 31, 2019, accumulated other comprehensive income was $0.6 million and $0.7 million, respectively, net of related tax impact of $0.2 million as of the end of each period. The net periodic postretirement benefit cost for the nine months ended September 30, 2020 and 2019 was $0.2 million and $0.1 million respectively. Pension Contributions and Funding GCP intends to satisfy its funding obligations under the U.S. qualified pension plans and to comply with all of the requirements of the Employee Retirement Income Security Act of 1974, as amended ("ERISA"). For ERISA purposes, funded status is calculated on a different basis than under GAAP. GCP made contributions of $15.0 million and $15.7 million, respectively, to the U.S. pension plans during the three and nine months ended September 30, 2020. There were no contributions made to these plans during the three and nine months ended September 30, 2019. GCP intends to fund non-U.S. pension plans based on applicable legal requirements, as well as actuarial and trustee recommendations. During the three and nine months ended September 30, 2020, GCP contributed $0.3 million and $1.1 million, respectively, to these non-U.S. plans. During the three and nine months ended September 30, 2019, GCP contributed $0.6 million and $1.8 million, respectively, to these non-U.S. plans. Defined Contribution Retirement Plan GCP sponsors a defined contribution retirement plan for its employees in the U.S. which is a qualified plan under section 401(k) of the U.S. tax code. Under this plan, GCP contributes an amount equal to 100% of employee contributions, up to 6% of an individual employee's salary or wages. Effective January 1, 2018, GCP amended the defined contribution plan whereby GCP contributes up to an additional 2% of 100% of applicable employee compensation subject to a three year vesting requirement for eligible employees. Applicable employees include those beginning employment with GCP on or after January 1, 2018 who are not eligible to participate in the GCP Applied Technologies Inc. Retirement Plan for Salaried Employees, which was closed to new hires effective January 1, 2018. GCP's costs related to this benefit plan amounted to $1.3 million and $3.5 million, respectively, during the three and nine months ended September 30, 2020 and $1.1 million and $3.5 million, respectively, during the three and nine months ended September 30, 2019. These costs are included in "Selling, general and administrative expenses" and "Cost of goods sold" in the accompanying unaudited Consolidated Statements of Operations.

Other Balance Sheet Information

Other Balance Sheet Information	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Balance Sheet Information	Other Balance Sheet Information The following is a summary of other current assets at September 30, 2020 and December 31, 2019: (In millions) September 30, December 31, Other Current Assets: Non-trade receivables $ 19.3 $ 22.1 Prepaid expenses and other current assets 11.6 13.4 Income taxes receivable 8.8 8.2 Total other current assets $ 39.7 $ 43.7 The following is a summary of other current liabilities at September 30, 2020 and December 31, 2019: (In millions) September 30, December 31, Other Current Liabilities: Accrued customer volume rebates $ 22.5 $ 28.4 Accrued compensation (1) 21.5 16.0 Income taxes payable 25.0 10.4 Accrued interest 8.8 4.2 Pension liabilities 0.7 1.2 Restructuring liability 8.4 2.7 Other accrued liabilities 47.8 50.7 Total other current liabilities $ 134.7 $ 113.6 ________________________________ (1) Accrued compensation presented in the table above includes salaries and wages, as well as estimated amounts due under the annual employee incentive programs. Sale of Corporate Headquarters On July 31, 2020, GCP sold its corporate headquarters located at 62 Whittemore Avenue, Cambridge, Massachusetts to IQHQ, L.P, entered into a leaseback transaction with the buyer, and received from the buyer cash proceeds of $122.5 million, net of the related transaction costs and commissions of $2.5 million, pursuant to the sale of the property. The gain on sale of the corporate headquarters of $110.2 million was recognized based on the assets' fair value of $133.6 million and carrying value of $20.9 million, net of related transaction costs of $2.5 million, upon transfer of control to the buyer at the time of the sale. The lease of GCP's corporate headquarters is classified as an operating lease and has an initial rent-free term of eighteen months. The lease commenced on July 31, 2020 and can be extended for an additional six months at GCP's option, subject to monthly rental payments of $0.6 million. The exercise of the extension option was not reasonably certain as of September 30, 2020. Pursuant to the terms of the lease, GCP is required to make certain payments for real estate taxes and other operating expenses related to the leased property which are recognized as variable lease expenses over the lease term. The initial eighteen month rent-free lease term fair value of $8.6 million was recognized as an Operating lease right-of-use asset in the accompanying unaudited Consolidated Balance Sheets as of the lease commencement date and is being amortized as operating lease expense on a straight-line basis over the lease term. The fair value of assets sold and the fair value of the Operating lease right-of-use asset related to free rent were determined based on Level 3 inputs. In determining fair value, the highest and best use of the assets sold differs from GCP’s current use of the assets as its’ corporate headquarters due to higher lease income that could potentially be generated by market participants based on the highest and best use of the premise. Acquisitions On May 4, 2018, GCP acquired 100% of the outstanding capital stock of Clydebridge Holdings Limited which owns 100% of RIW Limited ("RIW"), a U.K.-based supplier of waterproofing solutions for commercial and residential construction applications. The aggregate purchase price of $29.5 million, net of cash acquired of $10.0 million, consisted of a net cash payment of $29.8 million, which was reduced by working capital adjustments of $0.3 million. At the closing of the acquisition of RIW, $2.8 million was placed into escrow which was ascribed to the purchase price and will be released to the sellers no later than December 30, 2020. The escrow was related to the sellers’ satisfaction of indemnity claims and general representations and warranties. As of September 30, 2020, $1.3 million of consideration was released from the escrow to the sellers based on the provisions of the related agreement. Please refer to Note 20, "Acquisitions and Dispositions" to the Company's Consolidated Financial Statements included in the 2019 Annual Report in the Form 10-K for further information on this transaction.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies GCP enters into certain purchase commitments and is a party to many contracts containing guarantees and indemnification obligations, as described in Note 12, "Commitments and Contingencies" to the Company's Consolidated Financial Statements included in the 2019 Annual Report in the Form 10-K. There have been no material changes to these commitments and obligations during the nine months ended September 30, 2020. Although the outcome of each of the matters related to loss contingencies and obligations discussed below cannot be predicted with certainty, GCP has assessed the risk and has made accounting estimates and disclosures as required under GAAP. Environmental Matters GCP is subject to loss contingencies resulting from extensive and evolving federal, state, local and foreign environmental laws and regulations relating to the generation, storage, handling, discharge, disposition and stewardship of hazardous wastes and other materials. GCP recognizes accrued liabilities for anticipated costs associated with response efforts if, based on the results of the assessment, it concluded that a probable liability has been incurred and the cost can be reasonably estimated. As of September 30, 2020 and December 31, 2019, GCP did not have any material environmental liabilities. GCP's environmental liabilities are reassessed whenever circumstances become better defined or response efforts and their costs can be better estimated. These liabilities are evaluated based on currently available information, including the progress of remedial investigations at each site, the current status of discussions with regulatory authorities regarding the method and extent of remediation at each site, existing technology, prior experience in contaminated site remediation and the apportionment of costs among potentially responsible parties. Financial Assurances Financial assurances have been established for a variety of purposes, including insurance, environmental matters and other matters. At September 30, 2020 and December 31, 2019, GCP had gross financial assurances issued and outstanding of $5.7 million and $5.9 million, respectively, which were composed of standby letters of credit. The letters of credit are related primarily to customer advances and other performance obligations as of September 30, 2020 and December 31, 2019. These arrangements guarantee the refund of advance payments received from customers in the event that the product is not delivered or warranty obligations are not fulfilled in accordance with the contract terms. These obligations could be called by the beneficiaries at any time before the expiration date of the particular letter of credit if the Company fails to meet certain contractual requirements. Lawsuits and Investigations From time to time, GCP and its subsidiaries are parties to, or targets of, lawsuits, claims, investigations and proceedings which are managed and defended in the ordinary course of business. While GCP is unable to predict the outcome of these matters, it does not believe, based upon currently available facts, that the ultimate resolution of any of such pending matters will have a material adverse effect on its overall financial condition, results of operations or cash flows for the three and nine months ended September 30, 2020. GCP Brazil Indirect Tax Claim During the year ended December 31, 2019, the Superior Judicial Court of Brazil (the "Court") filed its final ruling in favor of GCP Brazil related to a claim whether a certain state value-added tax should be included in the calculation of federal gross receipts taxes. The Court decision is final and not subject to any appeals. The ruling allows the Company the right to recover, through offset of federal tax liabilities, amounts collected by the government from May 2012 to September 2017, including interest. Timing of the realization of these tax credits is dependent upon the generation of federal tax liabilities eligible for the offset. The Brazilian tax authorities have sought before the Court clarification of certain matters, including whether these credits should be recognized on a gross or net basis, and certain other matters that could affect the rights of Brazilian taxpayers regarding these credits. During the three months ended September 30, 2019, the Company recorded in "Other income, net" a pre-tax gain of $1.3 million, net of $0.4 million of legal fees and other charges, as a result of the favorable Court decision. No amounts have been recognized in GCP's results of operations for the credits calculated based on the higher gross basis due to uncertainty related to the recoverability of such amounts and the timing of the recovery. As of September 30, 2020, GCP has fully utilized the tax credits previously recognized on a net basis.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Stockholder Rights Plan On March 15, 2019, the Board of Directors (the "Board") declared a dividend of one preferred share purchase right (a “Right”) for each outstanding share of GCP common stock with par value $0.01 per share and adopted a stockholder rights plan (the “Rights Agreement”), as described in Note 13, "Stockholders' Equity," to the Company's Consolidated Financial Statements included in the 2019 Annual Report in the Form 10-K. The Rights were not becoming exercisable until 10 days after the public announcement that a person or group has become an “Acquiring Person” (as defined in the Rights Agreement) by obtaining beneficial ownership of 15% or more of the Company’s outstanding shares of common stock. If a stockholder’s beneficial ownership as of March 15, 2019 was at or above 15%, that stockholder’s existing ownership percentage would be grandfathered, but the Rights would become exercisable if at any time after an announcement that the stockholder increases its ownership percentage by 0.001% or more. The Rights were initially set to expire on March 14, 2020. On March 13, 2020, the Board approved an amendment to the Rights Agreement which raised the level of beneficial ownership for an Acquiring Person to 20% of the Company's outstanding shares of common stock and extended the final expiration date of the Rights Agreement to March 14, 2023, subject to stockholders' approval at GCP's 2020 Annual Meeting of Shareholders (the “Annual Meeting”). If a stockholder's beneficial ownership on March 15, 2019 was at or above 20%, that stockholder's existing ownership percentage would be grandfathered, but the Rights would become exercisable if the stockholder increases its ownership percentage by 0.001% or more. The amendment to the Rights Agreement was approved at the Annual Meeting held on May 28, 2020. Preferred Stock The Company is authorized to issue up to 50,000,000 shares of Preferred Stock with a par value of $0.01 per share. On March 15, 2019, GCP designated 10,000,000 shares of its Preferred Stock with a par value of $0.01 per share as Series A Junior Participating Preferred Stock. Share Repurchase Program On July 30, 2020, the Board of Directors (the “Board”) of GCP authorized a program to repurchase up to $100 million of the Company’s common stock which is effective through July 30, 2022. Share repurchases under the program may be made from time to time at the Board's discretion through open market purchases or privately negotiated transactions in accordance with applicable federal securities laws, including Rule 10b-18 of the Exchange Act. The share repurchase program is subject to a periodic review by the Board and may be suspended periodically or discontinued at any time. The Company plans to fund repurchases from its existing cash balance. No shares were repurchased by the Company during the three months ended September 30, 2020. Stockholders' Equity Activity The following table summarizes the Company’s stockholders' equity activity during the three months ended September 30, 2020 and 2019. Common Stock Treasury Stock (In millions) Number of Shares (2) Par Value Number of Shares (2) Cost Additional Paid-in Capital Accumulated Earnings Accumulated Other Comprehensive Loss Noncontrolling Interests Total Stockholders' Equity Balance, June 30, 2019 73.0 $ 0.7 0.3 $ (8.0) $ 50.2 $ 587.9 $ (120.7) $ 2.2 $ 512.3 Net income — — — — — 16.6 — 0.1 16.7 Share-based compensation — — — — 1.9 — — — 1.9 Exercise of stock options (2) — — — — 0.1 — — — 0.1 Share repurchases (1) — — — (0.1) — — — — (0.1) Other comprehensive loss — — — — — — (14.8) — (14.8) Balance, September 30, 2019 73.0 $ 0.7 0.3 $ (8.1) $ 52.2 $ 604.5 $ (135.5) $ 2.3 $ 516.1 Balance, June 30, 2020 73.3 $ 0.7 0.4 $ (8.9) $ 56.9 $ 610.0 $ (145.7) $ 2.2 $ 515.2 Net income — — — — — 99.4 — 0.2 99.6 Issuance of common stock in connection with stock plans (2) 0.1 — — — — — — — — Share-based compensation (3) — — — — 3.1 — — — 3.1 Exercise of stock options (2) — — — — 0.4 — — — 0.4 Share repurchases (1) — — — (1.1) — — — — (1.1) Other comprehensive income — — — — — — 10.8 — 10.8 Dividends and other changes in noncontrolling interest — — — — — — — (0.1) (0.1) Balance, September 30, 2020 73.5 $ 0.7 0.4 $ (10.0) $ 60.4 $ 709.4 $ (134.9) $ 2.3 $ 627.9 .________________________________ (1) Refer to Note 15, “Stock Incentive Plans”, for further information. (2) The par value of common shares issued may not be included in the table due to rounding. Total share amounts for common stock and treasury stock may not sum due to rounding.

Restructuring and Repositioning

Restructuring and Repositioning Expenses, Asset Impairments	9 Months Ended
	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
Restructuring and Repositioning Expenses, Asset Impairments	Restructuring and Repositioning Expenses, Asset Impairments GCP's Board of Directors approves all major restructuring and repositioning programs. Major restructuring programs may involve reorganizations, the discontinuation of significant product lines, the shutdown of significant facilities, or other major strategic initiatives. From time to time, GCP takes additional restructuring actions, including involuntary employee terminations that are not a part of a major program. Repositioning activities generally represent major strategic or transformational actions to enhance the value and performance of the Company, improve business efficiency or optimize the Company’s footprint. Repositioning expenses associated with the Plans discussed below, as well as a review of strategic, financial and operational alternatives, are primarily related to consulting, professional services, and other employee-related costs associated with the Company’s organizational realignment and advancing its technology strategy. Due to the scope and complexity of the Company’s repositioning activities, the range of estimated repositioning expenses and capital expenditures could increase or decrease and the timing of incurrence could change. 2019 Restructuring and Repositioning Plan (the “2019 Plan”) On February 22, 2019, the Board of Directors approved a business restructuring and repositioning plan (the “2019 Plan”). The 2019 Plan is focused on GCP’s global supply chain strategy, processes and execution, including its manufacturing, purchasing, logistics, and warehousing operations. The plan also addresses GCP’s service delivery model, primarily in North America, to streamline the Company’s pursuit of combined admixture and VERIFI ® opportunities. The program is expected to be completed by December 31, 2020. 2019 Phase 2 Restructuring and Repositioning Plan (the “2019 Phase 2 Plan") On July 31, 2019, the Board approved a business restructuring and repositioning plan to further optimize the design and footprint of the Company's global organization, primarily with respect to its general administration and business support functions, and streamline cross-functional activities (the “2019 Phase 2 Plan”). The 2019 Phase 2 Plan is expected to result in the net reduction of approximately 8%-10% of the Company's workforce. The program is expected to be completed by December 31, 2021. Strategic Alternatives Plan On February 27, 2019, the Company announced a comprehensive review of strategic alternatives to enhance shareholder value. Over the course of this review, GCP contacted and engaged with both strategic industry and private equity investors. This process did not result in a transaction that would provide adequate value to the Company's shareholders, and as a result, GCP determined that it will pursue its standalone strategic and financial plan (the "Strategic Alternatives Plan"). The following table illustrates a summary of the charges incurred and planned in connection with restructuring and repositioning plans discussed above: (In millions) Severance/employee costs Asset Impairments/ Write Offs Other Associated Costs Total Restructuring Repositioning Total Costs Capital Expenditures 2019 Plan: (1) Estimated Total Costs $1-2 $1 $0-1 $2-4 $11 $13-15 $2-3 Cumulative Costs incurred to Date $0.9 $0.9 $0.3 $2.1 $10.5 $12.6 $2.0 2019 Phase 2 Plan: (2) Estimated Total Costs $19-22 $1 $3-4 $23-27 $7-8 $30-35 $2 Cumulative Costs incurred to Date $12.5 $0.3 $— $12.8 $4.3 $17.1 $0.6 (1) As of September 30, 2020, the cumulative restructuring costs incurred under the 2019 Plan since its inception were $2.1 million, of which $1.7 million was related to the SCC segment and $0.4 million was related to the SBM segment. Estimated total pre-tax costs expected to be incurred in connection with the 2019 Plan decreased by $2.0 million due to lower severance and facilities consolidation costs. (2) As of September 30, 2020, the cumulative restructuring costs recognized under the 2019 Phase 2 Plan since its inception were $12.8 million, of which $3.6 million was attributable to the SCC segment, $2.3 million was attributable to the SBM segment, and $6.9 million was attributable to the Corporate. Estimated total pre-tax costs expected to be incurred in connection with the 2019 Phase 2 Plan increased by approximately $7.0 million from the prior estimate due to higher severance and other employee-related costs associated with the departure from the Company and resignation from the Board of the President and Chief Executive Officer's ("CEO") effective September 11, 2020 following Board approval. During the three months ended September 30, 2020, the Company incurred $6.9 million of severance and employee-related costs in connection with such separation, including $1.8 million associated with accelerated vesting of stock options and RSUs. Additional increases of estimated total pre-tax costs include asset impairments/write offs of $1.0 million resulting from the sale and relocation of the corporate headquarters to further optimize the footprint of GCP's global organization (please refer to Note 10, "Other Balance Sheet Information" for further information). The following tables represent the repositioning expenses incurred and cash payments made under the plans discussed above and other plans during each period: Three Months Ended September 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 0.1 $ — $ — $ — $ — $ 0.1 Cash Paid for Repositioning Expenses 0.3 0.4 0.1 — — 0.8 Capital Expenditures 0.3 0.2 — 0.1 0.2 0.8 Cash Paid for Capital Expenditures 0.5 0.2 — 0.3 0.4 1.4 Nine Months Ended September 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 1.7 $ 1.9 $ — $ 0.1 $ 0.1 $ 3.8 Cash Paid for Repositioning Expenses 4.8 3.2 1.1 — 0.2 9.3 Capital Expenditures 1.2 0.5 — 0.6 1.1 3.4 Cash Paid for Capital Expenditures 1.3 0.4 — 0.7 1.6 4.0 Three Months Ended September 30, 2019 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 3.1 $ 0.4 $ 0.3 $ 0.2 $ 0.4 $ 4.4 Cash Paid for Repositioning Expenses 1.3 — 0.5 0.2 0.2 2.2 Capital Expenditures 0.1 — — 0.1 2.0 2.2 Cash Paid for Capital Expenditures 0.1 — — 0.8 0.9 1.8 Nine Months Ended September 30, 2019 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 6.4 $ 0.4 $ 2.8 $ 5.3 $ 0.7 $ 15.6 Cash Paid for Repositioning Expenses 3.4 — 0.5 7.9 1.7 13.5 Capital Expenditures 0.4 — — 0.8 3.9 5.1 Cash Paid for Capital Expenditures 0.3 — — 0.8 2.0 3.1 As of September 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Cumulative Repositioning Expenses $ 10.5 $ 4.3 $ 3.1 $ 10.7 $ 9.7 Cumulative Cash Paid for Repositioning Expenses 10.4 4.2 3.1 10.7 9.6 Cumulative Capital Expenditure 2.0 0.6 — 1.5 13.5 Cumulative Cash Paid for Capital Expenditures 1.9 0.4 — 1.5 12.9 Restructuring Expenses and Asset Impairments The following restructuring expenses and asset impairment charges were incurred under the plans discussed above and other plans during each period: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Severance and other employee costs $ 7.7 $ 3.6 $ 9.6 $ 4.1 Asset impairments — 0.1 1.2 4.1 Other associated costs — 0.2 0.4 0.9 Total restructuring expenses and asset impairments $ 7.7 $ 3.9 $ 11.2 $ 9.1 Less: restructuring expenses and asset impairments reflected in discontinued operations — 0.1 — 0.3 Total restructuring expenses and asset impairments from continuing operations $ 7.7 $ 3.8 $ 11.2 $ 8.8 GCP incurred restructuring expenses and asset impairment charges related to its two operating segments and Corporate function as follows: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 SCC $ 0.6 $ 1.5 $ 3.2 $ 3.4 SBM 0.2 0.7 1.1 3.9 Corporate 6.9 1.6 6.9 1.5 Total restructuring expenses and asset impairments from continuing operations $ 7.7 $ 3.8 $ 11.2 $ 8.8 Restructuring expenses and asset impairments reflected in discontinued operations — 0.1 — 0.3 Total restructuring expenses and asset impairments $ 7.7 $ 3.9 $ 11.2 $ 9.1 Restructuring liabilities were $8.4 million and $2.7 million, respectively, as of September 30, 2020 and December 31, 2019. These liabilities are included within “Other current liabilities” in the accompanying unaudited Consolidated Balance Sheets. GCP settled in cash substantially all of the remaining liabilities related to the 2017 Plan during the nine months ended September 30, 2020. The following table summarizes the Company’s restructuring liability activity: 2019 Plan 2019 Phase 2 Plan 2018 Plan 2017 Plan Severance and other employee costs Other Costs Severance and other employee costs Severance and other employee costs Other Costs Severance and other employee costs Total Balance, December 31, 2019 $ 0.2 $ — $ 0.9 $ 1.0 $ 0.4 $ 0.2 $ 2.7 Expense (1) 0.2 0.2 1.7 — — — 2.1 Payments (0.1) — (0.6) (0.2) (0.3) (0.1) (1.3) Impact of foreign currency and other — — — (0.1) (0.1) — (0.2) Balance, March 31, 2020 $ 0.3 $ 0.2 $ 2.0 $ 0.7 $ — $ 0.1 $ 3.3 Expense (1) — 0.1 — — 0.1 — 0.2 Payments (0.1) (0.1) (0.3) (0.1) (0.1) — (0.7) Balance, June 30, 2020 $ 0.2 $ 0.2 $ 1.7 $ 0.6 $ — $ 0.1 $ 2.8 Expense (2) — — 5.9 — — — 5.9 Payments (0.1) (0.1) — (0.1) — — (0.3) Balance, September 30, 2020 $ 0.1 $ 0.1 $ 7.6 $ 0.5 $ — $ 0.1 $ 8.4 ________________________________ (1) There were no asset impairment charges that occurred during the three months ended September 30, 2020. GCP incurred $1.1 million of asset impairment charges attributable to the SCC segment as a part of the 2019 Plan and 2019 Phase 2 Plan during the nine months ended September 30, 2020. The Company incurred $0.1 million of asset impairment charges attributable to the SBM segment as a part of the 2019 Phase 2 Plan during the nine months ended September 30, 2020. These asset impairments are recorded with a corresponding reduction to "Properties and equipment, net" in the accompanying unaudited Consolidated Balance Sheets. These expenses are not recorded with a corresponding adjustment to the restructuring liability and therefore, are not included in the table above.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following tables present the pre-tax, tax benefit (expense), and after-tax components of GCP's other comprehensive income (loss) for the three and nine months ended September 30, 2020 and 2019: Three Months Ended (In millions) Pre-Tax Amount Tax Benefit After-Tax Amount Defined benefit pension and other postretirement plans $ 0.1 $ — $ 0.1 Currency translation adjustments (1) 10.3 0.5 10.8 Loss from hedging activities (0.1) — (0.1) Other comprehensive income attributable to GCP shareholders $ 10.3 $ 0.5 $ 10.8 Nine Months Ended September 30, 2020 (In millions) Pre-Tax Amount Tax Benefit After-Tax Amount Defined benefit pension and other postretirement plans $ 0.2 $ — $ 0.2 Currency translation adjustments (1) (18.4) 0.3 (18.1) Other comprehensive loss attributable to GCP shareholders $ (18.2) $ 0.3 $ (17.9) Three Months Ended September 30, 2019 (In millions) Pre-Tax Amount Tax Expense After-Tax Amount Currency translation adjustments (1) $ (14.4) $ (0.5) $ (14.9) Gain from hedging activities 0.1 — 0.1 Other comprehensive loss attributable to GCP shareholders $ (14.3) $ (0.5) $ (14.8) Nine Months Ended September 30, 2019 (In millions) Pre-Tax Amount Tax Expense After-Tax Amount Currency translation adjustments (1) $ (15.1) (0.4) $ (15.5) Other comprehensive loss attributable to GCP shareholders $ (15.1) $ (0.4) $ (15.5) _____________________ (1) Currency translation adjustments related to the net investment hedge are presented net of income taxes, as discussed in Note 5, "Derivative Instruments." The following tables present the changes in accumulated other comprehensive loss, net of tax, for the nine months ended September 30, 2020 and 2019: (In millions) Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments Hedging Activities Total Balance, December 31, 2019 $ (2.7) $ (114.2) $ (0.1) $ (117.0) Other comprehensive income (loss) before reclassifications 0.2 (18.1) 0.1 (17.8) Amounts reclassified from accumulated other comprehensive loss — — (0.1) (0.1) Current-period other comprehensive income (loss) 0.2 (18.1) — (17.9) Balance, September 30, 2020 $ (2.5) $ (132.3) $ (0.1) $ (134.9) (In millions) Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments Hedging Activities Total Balance, December 31, 2018 $ (2.2) $ (117.8) $ — $ (120.0) Other comprehensive loss before reclassifications — (15.5) (0.1) (15.6) Amounts reclassified from accumulated other comprehensive loss — — 0.1 0.1 Current period other comprehensive loss — (15.5) — (15.5) Balance, September 30, 2019 $ (2.2) $ (133.3) $ — $ (135.5) Please refer to Note 9, "Pension Plans and Other Postretirement Benefit Plans," for a discussion of pension plans and other postretirement benefit plans.

Stock Incentive Plans

Stock Incentive Plans	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Stock Incentive Plans	Stock Incentive Plans On October 1, 2020, GCP's Board of Directors adopted the GCP Applied Technologies Inc. 2020 Inducement Plan (the “Inducement Plan”) to reserve 1,000,000 shares of its common stock to be used exclusively for grants of awards to induce highly-qualified prospective employees to accept employment and to provide them with a proprietary interest in the Company. Awards that could be granted under the Inducement Plan consist of stock options, stock appreciation rights, restricted units, restricted stock, or deferred stock units. In accordance with Section 303A.08 of the New York Stock Exchange Listed Company Manual, the Company did not seek approval of the Inducement Plan by its stockholders . On October 1, 2020, the Company awarded to the new GCP CEO upon joining the Company, a grant with a value of approximately $5.0 million that consisted of 143,128 shares of restricted stock and 388,348 of stock options pursuant to the terms and conditions of the Inducement Plan. Stock-Based Compensation Accounting GCP grants stock options, restricted stock units (the "RSUs") and performance-based units (the "PBUs") with or without market conditions which vest upon the satisfaction of a performance condition and/or a service condition. Please refer to Note 17, "Stock Incentive Plans" to the Company's Consolidated Financial Statements included in the 2019 Annual Report in the Form 10-K for further information on these awards. Total stock-based compensation expense is included in "Income from continuing operations before income taxes" in the accompanying unaudited Consolidated Statements of Operations and was $3.3 million and $5.6 million, respectively, during the three and nine months ended September 30, 2020, and $2.3 million and $7.3 million, respectively, during the three and nine months ended September 30, 2019. During the three months ended September 30, 2020, $1.8 million of the stock-based compensation expense is included in "Restructuring expenses and asset impairments" related to accelerated vesting of stock options and RSUs due to the CEO's departure from the Company effective September 11, 2020 following Board approval. The Company issues new shares of common stock upon exercise of stock options and vesting of RSUs. In accordance with certain provisions of the GCP Equity and Incentive Plan (the "Plan"), GCP withholds and retains shares issued to certain holders of GCP awards in order to fulfill statutory tax withholding requirements for the employees. During the nine months ended September 30, 2020 and 2019, GCP withheld and retained approximately 62,200 shares and 130,900 shares, respectively, in a non-cash transaction with a cost of $1.4 million and $3.3 million, respectively, which were reflected as "Share Repurchases" in the accompanying unaudited Consolidated Statements of Stockholders' Equity. During the nine months ended September 30, 2020 and 2019, cash payments for such tax withholding obligations were $0.4 million and $3.3 million, respectively. As of September 30, 2020, approximately 7.6 million shares and 0.5 million shares of common stock, respectively, were reserved and available for future grant under the Plan and the Inducement Plan, respectively. Stock Options There were no stock options granted during the three and nine months ended September 30, 2020. The following assumptions were utilized in the Black-Scholes option pricing model for estimating the fair value of GCP's stock options granted during the nine months ended September 30, 2019: Nine Months Ended September 30, Assumptions used to calculate expense for stock options: 2019 Risk-free interest rate 1.70 - 2.64% Average life of options (years) 5.5 - 6.5 Volatility 28.02 - 28.59% Dividend yield — Weighted average fair value per stock option $8.66 The following table sets forth information relating to stock options denominated in GCP stock during the nine months ended September 30, 2020: Stock Option Activity Number Of Weighted Weighted Aggregated Outstanding, December 31, 2019 1,284 $ 22.66 3.18 $ 3,171 Options exercised (64) 17.80 Options forfeited/expired/canceled (289) 19.98 Outstanding, September 30, 2020 931 $ 23.82 3.39 $ 1,316 Exercisable, September 30, 2020 827 $ 23.23 3.17 $ 1,316 Vested and expected to vest, September 30, 2020 927 $ 23.80 3.38 $ 1,316 The weighted average grant date fair value of options granted during the three months ended September 30, 2019 was $6.66. The aggregate intrinsic values in the table above represent the total pre-tax intrinsic value, determined as the difference between GCP's closing stock price on the last trading day of September 30, 2020 and the exercise price, multiplied by the number of in-the-money options that would have been received by the option holders had all option holders exercised their in-the-money options at period end. The amount changes based on the fair market value of GCP's stock. Total intrinsic value of all options exercised during the three months ended September 30, 2020 was $0.2 million. Total intrinsic value of all options exercised during the nine months ended September 30, 2020 and 2019 was $0.3 million and $2.5 million, respectively. At September 30, 2020, total unrecognized stock-based compensation expense for stock options outstanding was $0.1 million and is expected to be recognized over the weighted-average period of approximately 0.7 years. Restricted Stock Units and Performance Based Units RSUs and PBUs are granted with the exercise price equal to zero and are converted to shares immediately upon vesting. As of September 30, 2020, $4.4 million of total unrecognized compensation expense related to the RSU and PBU awards is expected to be recognized over the remaining weighted-average service period of approximately 1.7 years. RSUs The following table sets forth the RSU activity for the nine months ended September 30, 2020: RSU Activity Number Of Weighted Outstanding, December 31, 2019 156 $ 27.33 RSUs settled (151) 24.69 RSUs forfeited (2) 22.83 RSUs granted 191 21.13 RSUs outstanding, September 30, 2020 194 $ 23.21 Expected to vest as of September 30, 2020 181 $ 23.29 The weighted average grant date fair value of RSUs granted during the three months ended September 30, 2020 and 2019 was $22.82 and $21.52 per share. The weighted average grant date fair value of RSUs granted during the nine months ended September 30, 2020 and 2019 was $21.13 and $26.77 per share, respectively. During the nine months ended September 30, 2020 and 2019, GCP distributed 151,000 shares and 255,000 shares, respectively, to settle RSUs upon vesting. The fair value of RSUs vested during the nine months ended September 30, 2020 and 2019 was $3.4 million and $6.4 million, respectively. PBUs PBUs are performance-based units which are granted by the Company either with or without market conditions and recorded at fair value on the grant date. The performance criteria for PBUs granted in 2020 and 2019 include a 3-year cumulative adjusted diluted earnings per share metric that is modified, up or down, based on the Company's total shareholder return ("TSR") relative to the performance of the Russell 3000 Specialty Chemicals and Building Materials Indices. For PBUs granted in 2018, such metric is modified, up or down, based on the Company's TSR relative to the performance of the Russell 3000 Index. The number of shares that ultimately vest, if any, is based on Company performance against these metrics, and can range from 0% to 200% of the target number of shares granted to employees. The 2020, 2019 and 2018 awards will become vested, if at all, three years from the grant date once actual performance is certified by the Board's Compensation Committee. Vesting is also subject to the employees' continued employment through the vesting date. The following table summarizes the assumptions used in the Monte Carlo simulations for estimating the grant date fair values of PBUs granted during the nine months ended September 30, 2020 and 2019: Nine Months Ended September 30, Assumptions used to calculate expense for PBUs: 2020 2019 Expected Term (Remaining Performance Period) 2.85 2.86 Expected volatility 29.85% 28.46% Risk-free interest rate 1.21% 2.48% Expected dividends — — Correlation coefficient 53.43% 54.81% Median correlation coefficient of constituents 54.01% 57.09% The following table sets forth the PBU activity for the nine months ended September 30, 2020: PBU Activity Number Of Weighted Outstanding, December 31, 2019 382 $ 29.51 PBU's settled — — PBU's forfeited (167) 26.71 PBU's granted 147 22.43 Outstanding, September 30, 2020 362 $ 27.91 The weighted average grant date fair value of PBUs granted during the nine months ended September 30, 2020 and 2019 was $22.43 and $27.19 per share, respectively. During the nine months ended September 30, 2019, GCP distributed 76461 sh

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth a reconciliation of the numerators and denominators used in calculating basic and diluted earnings (loss) per share: Three Months Ended September 30, Nine Months Ended September 30, (In millions, except per share amounts) 2020 2019 2020 2019 Numerators Income from continuing operations attributable to GCP shareholders $ 99.5 $ 17.0 $ 99.6 $ 34.7 (Loss) income from discontinued operations, net of income taxes (0.1) (0.4) (0.4) 5.9 Net income attributable to GCP shareholders $ 99.4 $ 16.6 $ 99.2 $ 40.6 Denominators Weighted average common shares—basic calculation 73.0 72.7 72.9 72.5 Dilutive effect of employee stock awards (2) 0.2 0.1 0.2 0.4 Weighted average common shares—diluted calculation 73.2 72.8 73.1 72.9 Basic earnings (loss) per share: (2) Income from continuing operations attributable to GCP shareholders $ 1.36 $ 0.23 $ 1.37 $ 0.48 (Loss) income from discontinued operations, net of income taxes $ — $ (0.01) $ (0.01) $ 0.08 Net income attributable to GCP shareholders (1) $ 1.36 $ 0.23 $ 1.36 $ 0.56 Diluted earnings (loss) per share: (2) Income from continuing operations attributable to GCP shareholders $ 1.36 $ 0.23 $ 1.36 $ 0.48 (Loss) income from discontinued operations, net of income taxes $ — $ (0.01) $ (0.01) $ 0.08 Net income attributable to GCP shareholders (1) $ 1.36 $ 0.23 $ 1.36 $ 0.56 ________________________________ (1) Amounts may not sum due to rounding. (2) Dilutive effect is only applicable to the periods during which GCP generated net income from continuing operations. GCP uses the treasury stock method to compute diluted earnings (loss) per share. During the three and nine months ended September 30, 2020, 0.6 million of anti-dilutive stock awards were excluded from the computation of diluted earnings per share during each period based on the treasury stock method as a result of income from continuing operations generated during the periods then ended. During the three and nine months ended September 30, 2019, 0.8 million and 0.6 million, respectively, of such anti-dilutive stock awards were excluded from the computation of diluted earnings per share.

Related Party Transactions and

Related Party Transactions and Transactions with Grace	9 Months Ended
	Sep. 30, 2020
Related Party Transactions [Abstract]
Related Party Transactions and Transactions with Grace	Related Party Transactions and Transactions with Grace All contracts with related parties are at rates and terms that GCP believes are comparable with those that could be entered into with independent third parties. Subsequent to the Separation, transactions with Grace represent third-party transactions. Related Party Transaction During the three months ended June 30, 2020, Starboard Value LP and certain of its affiliates ('Starboard") with an ownership interest of approximately 9% of the Company's outstanding common shares, filed a proxy statement with the SEC seeking an election of eight of its nominees to the GCP Board of Directors at the Company’s 2020 Annual Meeting of Shareholders (the “Annual Meeting”). At the Annual Meeting held on May 28, 2020, GCP stockholders voted to elect all eight nominees designated by Starboard to serve on GCP's Board of Directors. On July 2, 2020, the Company agreed to reimburse Starboard up to an amount of approximately $2.0 million for fees and expenses it incurred in connection with the election of its nominees. The Company paid $2.0 million of such costs to Starboard on July 16, 2020. Tax Sharing Agreement In connection with the Separation, the Company and Grace entered into a Tax Sharing Agreement which governs the parties’ respective rights, responsibilities and obligations with respect to tax liabilities and benefits, tax attributes, the preparation and filing of tax returns, the control of audits and other tax proceedings, as well as other matters regarding taxes. In general, and subject to the terms of the Tax Sharing Agreement, GCP is responsible for all U.S. federal, state and foreign taxes including any related interest, penalties or audit adjustments reportable on a GCP separate return (a return that does not include Grace or any of its subsidiaries). Grace is responsible for all U.S. federal, state and foreign income taxes including any related interest, penalties or audit adjustments reportable on a consolidated, combined or unitary return that includes Grace or any of its subsidiaries and GCP or any of its subsidiaries up to the Separation date. As of September 30, 2020 and December 31, 2019, GCP has recorded $3.7 million and $3.5 million, respectively, of indemnified receivables in "Other assets" and $0.9 million and $1.0 million, respectively, of indemnified payables in "Other current liabilities" in the accompanying unaudited Consolidated Balance Sheets.

Operating Segment and Geographi

Operating Segment and Geographic Information	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Operating Segment and Geographic Information	Operating Segment and Geographic Information GCP is engaged in the production and sale of specialty construction chemicals and specialty building materials through two operating segments. Specialty Construction Chemicals ("SCC") operating segment manufactures and markets concrete admixtures and cement additives and supplies in-transit monitoring systems for concrete producers. Specialty Building Materials ("SBM") operating segment manufactures and markets sheet and liquid membrane systems that protect structures from water, air and vapor penetration, as well as fireproofing and other products designed to protect the building envelope. Operating Segment Data The following table presents information related to GCP's operating segments: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Net Sales Specialty Construction Chemicals $ 138.3 $ 151.8 $ 379.6 $ 433.9 Specialty Building Materials 110.1 115.1 280.9 321.3 Total net sales $ 248.4 $ 266.9 $ 660.5 $ 755.2 Segment Operating Income Specialty Construction Chemicals segment operating income $ 18.6 $ 19.8 $ 36.4 $ 41.9 Specialty Building Materials segment operating income 25.4 25.9 50.1 64.1 Total segment operating income $ 44.0 $ 45.7 $ 86.5 $ 106.0 Reconciliation of Operating Segment Data to Financial Statements Corporate expenses directly related to the operating segments are allocated to the segment's operating income. GCP excludes from the segments' operating income certain functional costs, certain impacts of foreign currency exchange, as well as certain corporate costs and other costs included in the table below. GCP also excludes from the segment's operating income certain ongoing defined benefit pension costs recognized during each reporting period, which include service and interest costs, the effect of expected returns on plan assets and amortization of prior service costs/credits. GCP believes that the exclusion of certain corporate costs and pension costs provides a better indicator of its operating segment performance since such costs are not managed at an operating segment level. Total segment operating income for the three and nine months ended September 30, 2020 and 2019 is reconciled below to "Income from continuing operations before income taxes" presented in the accompanying unaudited Consolidated Statements of Operations: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Total segment operating income (1) $ 44.0 $ 45.7 $ 86.5 $ 106.0 Corporate costs (7.6) (8.9) (19.7) (28.2) Certain pension costs (1.3) (2.0) (3.9) (5.9) Shareholder activism and other related costs (2) (2.1) (0.1) (9.5) (3.7) Gain on sale of corporate headquarters 110.2 — 110.2 — Gain on Brazil tax recoveries, net (3) — 0.9 — 0.9 Repositioning expenses (0.1) (4.4) (3.8) (15.6) Restructuring expenses and asset impairments (7.7) (3.8) (11.2) (8.8) Third-party and other acquisition-related costs — — (0.7) (0.1) Legacy product, environmental and other claims — — — (0.1) Net income attributable to noncontrolling interests 0.2 0.1 0.4 0.3 Interest expense, net (5.3) (4.9) (15.1) (15.0) Income from continuing operations before income taxes $ 130.3 $ 22.6 $ 133.2 $ 29.8 __________________________ (1) Certain amounts related to COVID-19 costs have been reclassified between segments' operating income and corporate expenses that do not get allocated directly to the segments. Such reclassifications have not materially affected previously reported amounts. (2) Shareholder activism and other related costs consist primarily of professional fees incurred in connection with the actions by certain of GCP shareholders seeking changes in the composition of the Company's Board of Directors and nomination of candidates to stand for election at the 2019 and 2020 Annual Shareholders' Meetings, as well as other related matters. (3) Gain on Brazil tax recoveries, net primarily consists of a $1.7 million pre-tax gain related to indirect tax recoveries, and $0.8 million of legal fees and other charges relating to indirect and income tax recoveries. Please refer to Note 8, "Income Taxes" and Note 11, "Commitments and Contingencies" for further information. Disaggregation of Total Net Sales The Company disaggregates its revenue from contracts with customers by operating segments, which it believes best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. Geographic Area Data The table below presents information related to the geographic areas in which GCP operates. Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Net Sales United States $ 132.5 $ 134.8 $ 351.8 $ 369.2 Canada and Other 8.7 9.1 20.9 24.0 Total North America 141.2 143.9 372.7 393.2 Europe Middle East Africa 47.4 50.7 126.3 149.4 Asia Pacific 47.4 56.8 127.4 166.4 Latin America 12.4 15.5 34.1 46.2 Total $ 248.4 $ 266.9 $ 660.5 $ 755.2 Sales are attributed to geographic areas based on customer location. With the exception of the U.S. presented in the table above, there were no individually significant countries with sales exceeding 10% of total sales during the three and nine months ended September 30, 2020 and 2019. There were no customers that individually accounted for 10% or more of the Company's accounts receivable balance as of September 30, 2020 and December 31, 2019.

Discontinued Operations

Discontinued Operations	9 Months Ended
	Sep. 30, 2020
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations On July 3, 2017, the Company completed the sale of Darex to Henkel for $1.06 billion in cash (the “Disposition”). The agreement with Henkel governing the Disposition (the “Amended Purchase Agreement”) provides for a series of delayed closings in certain non-U.S. jurisdictions for which sale proceeds were received on the July 3, 2017 closing date. The delayed closings implement the legal transfer of the Darex business in the delayed closing jurisdictions in accordance with local law. In January 2020, the final remaining delayed closing in Venezuela was completed which did not result in a gain or a loss recognized during the nine months ended September 30, 2020. During the nine months ended September 30, 2019, the Company completed the delayed closing in Indonesia and recorded an after-tax gain on sale of $7.2 million. Up to the time of the delayed closings, the results of the operations of the Darex business within the delayed close countries are reported as “(Loss) income from discontinued operations, net of income taxes” in the accompanying unaudited Consolidated Statements of Operations, with the exception of operations in Venezuela which were deconsolidated during 2017. As of December 31, 2019, an asset of $0.5 million related to operations in Venezuela and a liability of $0.5 million related to the deferred sale proceeds received on July 3, 2017 were recognized in "Non-current assets held for sale" and “Other current liabilities” in the Consolidated Balance Sheets. During the nine months ended September 30, 2020, GCP derecognized the entire asset and liability amounts due to completing the delayed closing in Venezuela and recognizing the related sale proceeds. As of September 30, 2020, there were no remaining assets held for sale and no remaining liabilities for the consideration received on July 3, 2017 related to the delayed closings in connection with the sale of Darex. The following table includes a reconciliation of the gain on the sale of the Darex business related to delayed close entities recorded during the nine months ended September 30, 2019: Nine Months Ended September 30, (In millions) 2019 Net proceeds included in gain $ 12.7 Net assets derecognized (3.1) Gain recognized before income taxes 9.6 Tax effect of gain recognized (2.4) Gain recognized after income taxes $ 7.2 In connection with the Disposition and related gain, as noted above, the Company recorded tax expense of $2.4 million within discontinued operations during the nine months ended September 30, 2019. In connection with the Disposition, GCP and Henkel entered into a Master Tolling Agreement, whereby Henkel will operate certain equipment at facilities being sold in order to manufacture and prepare for shipping certain products related to product lines that the Company continues to own. The agreement expires in June 2024. Under the Amended Purchase Agreement, GCP is required to indemnify Henkel for certain possible future tax liabilities. As of September 30, 2020 and December 31, 2019, GCP has recorded an indemnification payable of $1.0 million and $0.9 million, respectively, as a result of the Disposition. The following table sets forth the components of "(Loss) income from discontinued operations, net of income taxes" in the accompanying unaudited Consolidated Statements of Operations (1) : Three Months Ended September 30 Nine Months Ended September 30, (In millions) 2019 2020 2019 Net sales $ — $ — $ — Cost of goods sold — — — Gross profit — — — Selling, general and administrative expenses 0.2 0.2 1.1 Restructuring expenses and asset impairments 0.1 — 0.3 Gain on sale of business — — (9.6) Other expenses, net 0.1 0.2 0.1 (Loss) income from discontinued operations before income taxes (0.4) (0.4) 8.1 Provision for income taxes — — (2.2) (Loss) income from discontinued operations, net of income taxes $ (0.4) $ (0.4) $ 5.9 _____________________ (1) There was no material activity during the three months ended September 30, 2020.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Consolidated Financial Statements are presented on a consolidated basis and include all of the accounts and operations of GCP and its majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The financial statements reflect the financial position, results of operations and cash flows of GCP in accordance with generally accepted accounting principles in the United States ("GAAP") and with the instructions to Form 10-Q and Article 10 of SEC Regulation S-X for interim financial information. The interim financial statements presented herein are unaudited and should be read in conjunction with the audited Consolidated Financial Statements and notes thereto contained in GCP's Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2019 (the "2019 Annual Report on Form 10-K"). The Consolidated Balance Sheet as of December 31, 2019 was derived from the audited annual consolidated financial statements as of the period then ended. Certain information and footnote disclosures typically included in GCP's annual consolidated financial statements have been condensed or omitted. The unaudited financial statements reflect all adjustments that, in the opinion of management, are necessary for a fair statement of the results of the interim periods presented. All such adjustments are of a normal recurring nature except for the impacts of adopting new accounting standards discussed below. The results of operations for the three and nine months ended September 30, 2020 are not necessarily indicative of the results of operations for the year ending December 31, 2020.
Discontinued Operations	Discontinued Operations On July 3, 2017, the Company completed the sale of Darex to Henkel. The agreement with Henkel governing the Disposition (the “Amended Purchase Agreement”) provides for a series of delayed closings in certain non-U.S. jurisdictions. In conjunction with this transaction and applicable GAAP, the assets and liabilities related to Darex in the applicable delayed close countries have been reclassified and reflected as held for sale in the accompanying unaudited Consolidated Balance Sheets as of December 31, 2019, as discussed further in Note 19, "Discontinued Operations." Additionally, Darex results of operations and cash flows have been reclassified and reflected as "discontinued operations" in the accompanying unaudited Consolidated Statements of Operations and unaudited Consolidated Statements of Cash Flows for all periods presented.
Use of Estimates	Use of Estimates    The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the unaudited Consolidated Financial Statements, and the reported amounts of revenues and expenses for the periods presented. The Company assesses the estimates on an ongoing basis and records changes in estimates in the period they occur and become known. GCP's accounting measurements that are most affected by management's estimates of future events are disclosed in its 2019 Annual Report on Form 10-K. Actual results could differ from those estimates. On March 11, 2020, the World Health Organization declared the outbreak of the novel strain of coronavirus ("COVID-19") a global pandemic and recommended a number of restrictive measures to contain the spread. Many governments in the regions where GCP generates the majority of its revenue have adopted such policies, including social distancing and restrictions on construction activities deemed non-essential. GCP has been closely monitoring the impact of COVID-19 and working to manage the effects on its business globally. While certain restrictive measures in some of the regions where GCP operates have been lifted by government authorities, it is difficult to estimate with reasonable certainty at this time the duration and extent of the impact of the pandemic on the global economy, the Company's business, financial position and results of operations. GCP has made certain estimates within its financial statements related to the impact of COVID-19, including allowances for credit losses related to the estimated amount of receivables not expected to be collected and excess, obsolete or damaged inventories, future expected cash flows related to impairment assessments of goodwill and long-lived assets, incentive compensation accruals, contingent liabilities, and sales allowances related to volume rebates recognized based on anticipated sales volume. There may be changes to the Company's estimates in future periods due to uncertainty associated with the impact of COVID-19, the extent of which will depend largely on future developments, including new information which may emerge concerning the severity, duration and resurgence of the pandemic, additional and unanticipated actions by government authorities to further contain the spread of COVID-19 or address its impact, as well as the timing of development of an antiviral vaccine or a medical treatment to prevent further spread of the virus and facilitate recovery, among other things.
Income Tax	Income Tax As a global enterprise, GCP is subject to a complex array of tax regulations and needs to make assessments of applicable tax law and judgments in estimating its ultimate income tax liability. Income tax expense and income tax balances represent GCP’s federal, state and foreign income taxes as an independent company. GCP files a U.S. consolidated income tax return, along with foreign and state corporate income tax filings, as required. Please refer to Note 8, "Income Taxes," for details regarding estimates used in accounting for income tax matters, including unrecognized tax benefits.
Foreign Currency Transactions and Translation	Foreign Currency Transactions and Translation Certain transactions of the Company and its subsidiaries are denominated in currencies other than their functional currency. Foreign currency exchange gains (losses) generated from the settlement and remeasurement of these transactions are recognized in earnings and presented within “Other income, net” in the Company’s accompanying unaudited Consolidated Statements of Operations. Net foreign currency transaction and remeasurement gains (losses) reflected in “Other income, net” were $0.9 million and $1.7 million for the three and nine months ended September 30, 2020. Net foreign currency transaction and remeasurement gains (losses) were immaterial for the three and nine months ended September 30, 2019.
Reclassifications	Reclassifications
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted Accounting Standards Credit Losses In June 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2016-13, Financial Instruments- Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which applies to most financial assets measured at amortized cost, as well as certain other instruments, including trade receivables, other receivables and other financial assets. Topic 326 replaces the incurred credit loss methodology with the expected credit loss model which requires recognition of an allowance against the assets’ amortized cost to reflect the amount expected to be collected. Expected credit losses are estimated over the contractual life of financial assets and recognized at inception. GCP has adopted Topic 326 effective January 1, 2020 using the modified retrospective approach. The adoption did not have a material impact on its financial position as of September 30, 2020 and results of operations and cash flows for the three and nine months ended September 30, 2020. GCP did not recognize any cumulative effect adjustments to the retained earnings as of January 1, 2020 as a result of the adoption. The adoption of Topic 326 did not result in any significant modifications to the Company's policies related to recognizing allowance for trade receivables not expected to be collected which are disclosed in Note 1, "Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies," to the Company’s Consolidated Financial Statements included in the 2019 Annual Report on Form 10-K. Please refer to Note 3, "Accounts Receivable, Allowance for Credit Losses" for further information on the Company's policies and methodologies resulting from the adoption. Goodwill In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350) . The amendments in this update eliminate the requirement to calculate the implied fair value of goodwill (Step 2) when measuring a goodwill impairment loss which is based on the excess of a reporting unit’s carrying amount over its fair value. The standard is effective for the Company for its annual or any interim goodwill impairment tests to be performed beginning on or after January 1, 2020. GCP adopted the standard effective January 1, 2020. The adoption did not have a material impact on its financial position, results of operations and cash flows upon adoption. Other During the three and nine months ended September 30, 2020, except as discussed above, there were no material changes to the Company's significant accounting and financial reporting policies from those reflected in the Annual Report on Form 10-K for the year ended December 31, 2019. For further information with regard to the Company’s Significant Accounting Policies, please refer to Note 1, "Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies," to the Company’s Consolidated Financial Statements included in the 2019 Annual Report on Form 10-K.

Revenue from Lessor Arrangeme_2

Revenue from Lessor Arrangements and Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2020
Revenues [Abstract]
Components of Operating Lease and Service Revenue	The following table summarizes the revenue recognized for these sales arrangements for the three and nine months ended September 30, 2020 and 2019 and distinguishes between the lease and the service revenue: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Lease revenue (1): Lease payments revenue $ 7.1 $ 6.5 $ 20.9 $ 19.7 Variable lease revenue 2.8 2.1 7.5 5.6 Total lease revenue $ 9.9 $ 8.6 $ 28.4 $ 25.3 Service revenue (2): Fixed fee revenue $ 0.4 $ — $ 0.8 $ 0.1 Variable fee revenue 1.7 1.4 4.6 3.4 Total service revenue $ 2.1 $ 1.4 $ 5.4 $ 3.5 Total revenue $ 12.0 $ 10.0 $ 33.8 $ 28.8 ________________________________ (1) Lease revenue consists of dispenser lease revenue, as well as an allocated portion of VERIFI ® fixed fees and variable slump management fees. Lease revenue is included within "Net Sales" in the accompanying unaudited Consolidated Statements of Operations. (2) Service revenue consists of an allocated portion of VERIFI ® fixed fees and variable slump management fees. Service revenue is included within "Net Sales" in the accompanying unaudited Consolidated Statements of Operations.

Accounts Receivable, Allowanc_2

Accounts Receivable, Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
Accounts Receivable, Allowance for Credit Loss	The following table summarizes the activity for the allowance for credit losses during the three and nine months ended September 30, 2020 and 2019: (In millions) Three months ended September 30, Nine months ended September 30, 2020 2019 2020 2019 Beginning balance $ 7.3 $ 6.3 $ 7.5 $ 5.8 Provision for expected credit losses 0.3 0.6 1.0 2.1 Write offs (0.4) (0.2) (0.9) (1.2) Foreign currency translation adjustments 0.1 (0.2) (0.3) (0.2) Ending balance $ 7.3 $ 6.5 $ 7.3 $ 6.5

Inventories, net (Tables)

Inventories, net (Tables)	9 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Schedule of Inventories	The following is a summary of inventories presented in the accompanying unaudited Consolidated Balance Sheets at September 30, 2020 and December 31, 2019: (In millions) September 30, December 31, Raw materials $ 39.3 $ 40.0 In process 4.6 4.0 Finished products and other 47.4 51.9 Total inventories, net $ 91.3 $ 95.9

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net Investment Hedges in Balance Sheets	The following table summarizes the fair value of the Company’s derivative instruments designated as net investment hedges as of September 30, 2020 and December 31, 2019: (In millions) September 30, 2020 December 31, 2019 Derivative assets (1) : Foreign exchange forward contracts $ 0.7 $ 1.1 Derivative liability (1) : Foreign exchange forward contracts $ (0.6) $ — __________________________ (1) The fair value of derivative instruments is measured based on expected future cash flows discounted at market interest rates using observable market inputs and classified as Level 2 within the fair value hierarchy. As of September 30, 2020, fair value of derivative assets of $0.1 million and $0.6 million, respectively, is recorded within "Other Current Assets" and "Other Assets" in the accompanying unaudited Consolidated Balance Sheets, and fair value of derivative liability is recorded within "Other Liabilities" in the accompanying unaudited Consolidated Balance Sheets. As of December 31, 2019, fair value of derivative assets of $0.3 million and $0.8 million, respectively, is recorded within "Other Current Assets" and "Other Assets" in the accompanying unaudited Consolidated Balance Sheets.
Net Investment Hedges in Consolidated Statements of Operations and Comprehensive Income	The following table summarizes the amounts recorded in the Company's accompanying unaudited Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income (Loss) related to forward contracts designated as net investment hedges for the three and nine months ended September 30, 2020 and 2019: (In millions) Three Months Ended September 30, 2020 Three Months Ended September 30, 2019 Other Income, net Cumulative Translation Adjustments (1) Other Income, net Cumulative Translation Adjustments (1) Gains (losses) on foreign exchange forward contracts $ 0.2 $ (1.5) $ 0.2 $ 1.5 (In millions) Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Other Income, net Cumulative Translation Adjustments (1) Other Income, net Cumulative Translation Adjustments (1) Gains (losses) on foreign exchange forward contracts $ 0.8 $ (1.0) $ 0.3 $ 1.3 __________________________ (1) The amounts are presented net of tax benefit of $0.5 million and $0.3 million, respectively, for the three and nine months ended September 30, 2020. The amounts are presented net of tax liability of $0.5 million and $0.4 million, respectively, for the three and nine months ended September 30, 2019.

Debt and Other Borrowings (Tabl

Debt and Other Borrowings (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Components of Debt and Other Borrowings	The following is a summary of obligations under senior notes and other borrowings at September 30, 2020 and December 31, 2019: (In millions) September 30, December 31, 5.5% Senior Notes due in 2026, net of unamortized debt issuance costs of $3.5 million and $3.9 million, respectively, at September 30, 2020 and December 31, 2019 $ 346.5 $ 346.1 Revolving credit facility due 2023 (1) — — Other borrowings (2) 6.4 3.1 Total debt 352.9 349.2 Less: debt payable within one year 4.1 2.7 Debt payable after one year $ 348.8 $ 346.5 Weighted average interest rates on total debt obligations 5.5 % 5.5 % __________________________ (1) Represents borrowings under the Revolving Credit Facility with an aggregate available principal amount of $350.0 million as of September 30, 2020 and December 31, 2019. (2) Represents borrowings of $3.5 million and $1.8 million, respectively, at September 30, 2020 and December 31, 2019, under various lines of credit and other borrowings, primarily by non-U.S. subsidiaries, as well as $2.9 million and $1.3 million, respectively, of finance lease obligations.
Principal Maturities of Debt and Finance Lease Obligations Outstanding	The principal maturities of debt obligations outstanding, net of debt issuance costs, were as follows at September 30, 2020: (In millions) Amount Remainder of 2020 $ 3.7 2021 0.7 2022 0.7 2023 0.7 2024 0.5 Thereafter 346.6 Total debt $ 352.9
Carrying Amounts and Fair Values of Debt Instruments	The carrying amount and fair value of GCP's debt and other borrowings were as follows: September 30, 2020 December 31, 2019 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value 5.5% Senior Notes due in 2026 $ 346.5 $ 357.5 $ 346.1 $ 366.3 Other borrowings 6.4 6.4 3.1 3.1 Total debt $ 352.9 $ 363.9 $ 349.2 $ 369.4

Lessee Arrangements (Tables)

Lessee Arrangements (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Lease Expense	The following table summarizes components of lease expense for the three and nine months ended September 30, 2020 and 2019: Three months ended September 30, Nine months ended September 30, (In millions) 2020 2019 2020 2019 Operating lease expense $ 3.7 $ 2.9 $ 9.9 $ 9.3 Variable lease expense 1.9 1.0 4.3 3.5 Short-term lease expense 0.7 0.7 2.1 1.6 Total lease expense $ 6.3 $ 4.6 $ 16.3 $ 14.4 Nine months ended September 30, (In millions) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 8.8 $ 9.4 Operating lease right of use assets obtained in exchange for new lease obligations: Upon adoption of Topic 842 $ — $ 40.8 During the current period 12.9 3.7 Total $ 12.9 $ 44.5

Pension Plans and Other Postr_2

Pension Plans and Other Postretirement Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2020
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Net Funded Status of Over-Funded, Underfunded, and Unfunded Pension Plans	The following table presents the funded status of GCP's overfunded, underfunded and unfunded defined pension plans: (In millions) September 30, 2020 December 31, 2019 Overfunded defined benefit pension plans $ 26.1 $ 25.0 Underfunded defined benefit pension plans (30.1) (40.8) Unfunded defined benefit pension plans (26.9) (26.7) Total underfunded and unfunded defined benefit pension plans (57.0) (67.5) Pension liabilities included in other current liabilities (0.7) (1.2) Net funded status $ (31.6) $ (43.7)
Components of Net Periodic Benefit Cost (Income)	Components of Net Periodic Benefit Cost The components of GCP's net periodic benefit cost for the three and nine months ended September 30, 2020 and 2019 are as follows: Three Months Ended September 30, 2020 2019 Pension Pension (In millions) U.S. Non-U.S. U.S. Non-U.S. Service cost $ 1.5 $ 0.3 $ 1.6 $ 0.7 Interest cost 1.3 1.0 1.4 1.4 Expected return on plan assets (1.6) (1.2) (1.6) (1.5) Net periodic benefit cost (1) $ 1.2 $ 0.1 $ 1.4 $ 0.6 Nine Months Ended September 30, 2020 2019 Pension Pension (In millions) U.S. Non-U.S. U.S. Non-U.S. Service cost $ 4.6 $ 0.7 $ 4.8 $ 2.0 Interest cost 3.8 3.1 4.3 4.1 Expected return on plan assets (4.9) (3.5) (4.8) (4.5) Amortization of prior service cost — 0.1 — — Net periodic benefit cost (1) $ 3.5 $ 0.4 $ 4.3 $ 1.6 ________________________________ (1) Service cost component of net periodic benefit cost is included in "Selling, general and administrative expenses" and "Cost of goods sold" in the accompanying unaudited Consolidated Statements of Operations. All other components of net periodic benefit costs are presented in "Other income, net," within the accompanying unaudited Consolidated Statements of Operations.

Other Balance Sheet Informati_2

Other Balance Sheet Information (Tables)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Other Current Assets	The following is a summary of other current assets at September 30, 2020 and December 31, 2019: (In millions) September 30, December 31, Other Current Assets: Non-trade receivables $ 19.3 $ 22.1 Prepaid expenses and other current assets 11.6 13.4 Income taxes receivable 8.8 8.2 Total other current assets $ 39.7 $ 43.7
Schedule of Other Current Liabilities	The following is a summary of other current liabilities at September 30, 2020 and December 31, 2019: (In millions) September 30, December 31, Other Current Liabilities: Accrued customer volume rebates $ 22.5 $ 28.4 Accrued compensation (1) 21.5 16.0 Income taxes payable 25.0 10.4 Accrued interest 8.8 4.2 Pension liabilities 0.7 1.2 Restructuring liability 8.4 2.7 Other accrued liabilities 47.8 50.7 Total other current liabilities $ 134.7 $ 113.6 ________________________________ (1) Accrued compensation presented in the table above includes salaries and wages, as well as estimated amounts due under the annual employee incentive programs.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Schedule of Stockholders' Equity	The following table summarizes the Company’s stockholders' equity activity during the three months ended September 30, 2020 and 2019. Common Stock Treasury Stock (In millions) Number of Shares (2) Par Value Number of Shares (2) Cost Additional Paid-in Capital Accumulated Earnings Accumulated Other Comprehensive Loss Noncontrolling Interests Total Stockholders' Equity Balance, June 30, 2019 73.0 $ 0.7 0.3 $ (8.0) $ 50.2 $ 587.9 $ (120.7) $ 2.2 $ 512.3 Net income — — — — — 16.6 — 0.1 16.7 Share-based compensation — — — — 1.9 — — — 1.9 Exercise of stock options (2) — — — — 0.1 — — — 0.1 Share repurchases (1) — — — (0.1) — — — — (0.1) Other comprehensive loss — — — — — — (14.8) — (14.8) Balance, September 30, 2019 73.0 $ 0.7 0.3 $ (8.1) $ 52.2 $ 604.5 $ (135.5) $ 2.3 $ 516.1 Balance, June 30, 2020 73.3 $ 0.7 0.4 $ (8.9) $ 56.9 $ 610.0 $ (145.7) $ 2.2 $ 515.2 Net income — — — — — 99.4 — 0.2 99.6 Issuance of common stock in connection with stock plans (2) 0.1 — — — — — — — — Share-based compensation (3) — — — — 3.1 — — — 3.1 Exercise of stock options (2) — — — — 0.4 — — — 0.4 Share repurchases (1) — — — (1.1) — — — — (1.1) Other comprehensive income — — — — — — 10.8 — 10.8 Dividends and other changes in noncontrolling interest — — — — — — — (0.1) (0.1) Balance, September 30, 2020 73.5 $ 0.7 0.4 $ (10.0) $ 60.4 $ 709.4 $ (134.9) $ 2.3 $ 627.9 .________________________________ (1) Refer to Note 15, “Stock Incentive Plans”, for further information. (2) The par value of common shares issued may not be included in the table due to rounding. Total share amounts for common stock and treasury stock may not sum due to rounding.

Restructuring and Repositioni_2

Restructuring and Repositioning Expenses, Asset Impairments (Tables)	9 Months Ended
	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Expenses	The following table illustrates a summary of the charges incurred and planned in connection with restructuring and repositioning plans discussed above: (In millions) Severance/employee costs Asset Impairments/ Write Offs Other Associated Costs Total Restructuring Repositioning Total Costs Capital Expenditures 2019 Plan: (1) Estimated Total Costs $1-2 $1 $0-1 $2-4 $11 $13-15 $2-3 Cumulative Costs incurred to Date $0.9 $0.9 $0.3 $2.1 $10.5 $12.6 $2.0 2019 Phase 2 Plan: (2) Estimated Total Costs $19-22 $1 $3-4 $23-27 $7-8 $30-35 $2 Cumulative Costs incurred to Date $12.5 $0.3 $— $12.8 $4.3 $17.1 $0.6 (1) As of September 30, 2020, the cumulative restructuring costs incurred under the 2019 Plan since its inception were $2.1 million, of which $1.7 million was related to the SCC segment and $0.4 million was related to the SBM segment. Estimated total pre-tax costs expected to be incurred in connection with the 2019 Plan decreased by $2.0 million due to lower severance and facilities consolidation costs. (2) As of September 30, 2020, the cumulative restructuring costs recognized under the 2019 Phase 2 Plan since its inception were $12.8 million, of which $3.6 million was attributable to the SCC segment, $2.3 million was attributable to the SBM segment, and $6.9 million was attributable to the Corporate. Estimated total pre-tax costs expected to be incurred in connection with the 2019 Phase 2 Plan increased by approximately $7.0 million from the prior estimate due to higher severance and other employee-related costs associated with the departure from the Company and resignation from the Board of the President and Chief Executive Officer's ("CEO") effective September 11, 2020 following Board approval. During the three months ended September 30, 2020, the Company incurred $6.9 million of severance and employee-related costs in connection with such separation, including $1.8 million associated with accelerated vesting of stock options and RSUs. Additional increases of estimated total pre-tax costs include asset impairments/write offs of $1.0 million resulting from the sale and relocation of the corporate headquarters to further optimize the footprint of GCP's global organization (please refer to Note 10, "Other Balance Sheet Information" for further information). The following tables represent the repositioning expenses incurred and cash payments made under the plans discussed above and other plans during each period: Three Months Ended September 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 0.1 $ — $ — $ — $ — $ 0.1 Cash Paid for Repositioning Expenses 0.3 0.4 0.1 — — 0.8 Capital Expenditures 0.3 0.2 — 0.1 0.2 0.8 Cash Paid for Capital Expenditures 0.5 0.2 — 0.3 0.4 1.4 Nine Months Ended September 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 1.7 $ 1.9 $ — $ 0.1 $ 0.1 $ 3.8 Cash Paid for Repositioning Expenses 4.8 3.2 1.1 — 0.2 9.3 Capital Expenditures 1.2 0.5 — 0.6 1.1 3.4 Cash Paid for Capital Expenditures 1.3 0.4 — 0.7 1.6 4.0 Three Months Ended September 30, 2019 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 3.1 $ 0.4 $ 0.3 $ 0.2 $ 0.4 $ 4.4 Cash Paid for Repositioning Expenses 1.3 — 0.5 0.2 0.2 2.2 Capital Expenditures 0.1 — — 0.1 2.0 2.2 Cash Paid for Capital Expenditures 0.1 — — 0.8 0.9 1.8 Nine Months Ended September 30, 2019 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 6.4 $ 0.4 $ 2.8 $ 5.3 $ 0.7 $ 15.6 Cash Paid for Repositioning Expenses 3.4 — 0.5 7.9 1.7 13.5 Capital Expenditures 0.4 — — 0.8 3.9 5.1 Cash Paid for Capital Expenditures 0.3 — — 0.8 2.0 3.1 As of September 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Cumulative Repositioning Expenses $ 10.5 $ 4.3 $ 3.1 $ 10.7 $ 9.7 Cumulative Cash Paid for Repositioning Expenses 10.4 4.2 3.1 10.7 9.6 Cumulative Capital Expenditure 2.0 0.6 — 1.5 13.5 Cumulative Cash Paid for Capital Expenditures 1.9 0.4 — 1.5 12.9 The following restructuring expenses and asset impairment charges were incurred under the plans discussed above and other plans during each period: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Severance and other employee costs $ 7.7 $ 3.6 $ 9.6 $ 4.1 Asset impairments — 0.1 1.2 4.1 Other associated costs — 0.2 0.4 0.9 Total restructuring expenses and asset impairments $ 7.7 $ 3.9 $ 11.2 $ 9.1 Less: restructuring expenses and asset impairments reflected in discontinued operations — 0.1 — 0.3 Total restructuring expenses and asset impairments from continuing operations $ 7.7 $ 3.8 $ 11.2 $ 8.8 GCP incurred restructuring expenses and asset impairment charges related to its two operating segments and Corporate function as follows: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 SCC $ 0.6 $ 1.5 $ 3.2 $ 3.4 SBM 0.2 0.7 1.1 3.9 Corporate 6.9 1.6 6.9 1.5 Total restructuring expenses and asset impairments from continuing operations $ 7.7 $ 3.8 $ 11.2 $ 8.8 Restructuring expenses and asset impairments reflected in discontinued operations — 0.1 — 0.3 Total restructuring expenses and asset impairments $ 7.7 $ 3.9 $ 11.2 $ 9.1
Schedule of Restructuring Liability	The following table summarizes the Company’s restructuring liability activity: 2019 Plan 2019 Phase 2 Plan 2018 Plan 2017 Plan Severance and other employee costs Other Costs Severance and other employee costs Severance and other employee costs Other Costs Severance and other employee costs Total Balance, December 31, 2019 $ 0.2 $ — $ 0.9 $ 1.0 $ 0.4 $ 0.2 $ 2.7 Expense (1) 0.2 0.2 1.7 — — — 2.1 Payments (0.1) — (0.6) (0.2) (0.3) (0.1) (1.3) Impact of foreign currency and other — — — (0.1) (0.1) — (0.2) Balance, March 31, 2020 $ 0.3 $ 0.2 $ 2.0 $ 0.7 $ — $ 0.1 $ 3.3 Expense (1) — 0.1 — — 0.1 — 0.2 Payments (0.1) (0.1) (0.3) (0.1) (0.1) — (0.7) Balance, June 30, 2020 $ 0.2 $ 0.2 $ 1.7 $ 0.6 $ — $ 0.1 $ 2.8 Expense (2) — — 5.9 — — — 5.9 Payments (0.1) (0.1) — (0.1) — — (0.3) Balance, September 30, 2020 $ 0.1 $ 0.1 $ 7.6 $ 0.5 $ — $ 0.1 $ 8.4 ________________________________ (1) There were no asset impairment charges that occurred during the three months ended September 30, 2020. GCP incurred $1.1 million of asset impairment charges attributable to the SCC segment as a part of the 2019 Plan and 2019 Phase 2 Plan during the nine months ended September 30, 2020. The Company incurred $0.1 million of asset impairment charges attributable to the SBM segment as a part of the 2019 Phase 2 Plan during the nine months ended September 30, 2020. These asset impairments are recorded with a corresponding reduction to "Properties and equipment, net" in the accompanying unaudited Consolidated Balance Sheets. These expenses are not recorded with a corresponding adjustment to the restructuring liability and therefore, are not included in the table above.

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Schedule of Pre-tax, Tax, and After-tax Components of Other Comprehensive Income (Loss)	The following tables present the pre-tax, tax benefit (expense), and after-tax components of GCP's other comprehensive income (loss) for the three and nine months ended September 30, 2020 and 2019: Three Months Ended (In millions) Pre-Tax Amount Tax Benefit After-Tax Amount Defined benefit pension and other postretirement plans $ 0.1 $ — $ 0.1 Currency translation adjustments (1) 10.3 0.5 10.8 Loss from hedging activities (0.1) — (0.1) Other comprehensive income attributable to GCP shareholders $ 10.3 $ 0.5 $ 10.8 Nine Months Ended September 30, 2020 (In millions) Pre-Tax Amount Tax Benefit After-Tax Amount Defined benefit pension and other postretirement plans $ 0.2 $ — $ 0.2 Currency translation adjustments (1) (18.4) 0.3 (18.1) Other comprehensive loss attributable to GCP shareholders $ (18.2) $ 0.3 $ (17.9) Three Months Ended September 30, 2019 (In millions) Pre-Tax Amount Tax Expense After-Tax Amount Currency translation adjustments (1) $ (14.4) $ (0.5) $ (14.9) Gain from hedging activities 0.1 — 0.1 Other comprehensive loss attributable to GCP shareholders $ (14.3) $ (0.5) $ (14.8) Nine Months Ended September 30, 2019 (In millions) Pre-Tax Amount Tax Expense After-Tax Amount Currency translation adjustments (1) $ (15.1) (0.4) $ (15.5) Other comprehensive loss attributable to GCP shareholders $ (15.1) $ (0.4) $ (15.5) _____________________ (1) Currency translation adjustments related to the net investment hedge are presented net of income taxes, as discussed in Note 5, "Derivative Instruments."
Schedule of Changes of Accumulated Other Comprehensive Income (Loss), Net of Tax	The following tables present the changes in accumulated other comprehensive loss, net of tax, for the nine months ended September 30, 2020 and 2019: (In millions) Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments Hedging Activities Total Balance, December 31, 2019 $ (2.7) $ (114.2) $ (0.1) $ (117.0) Other comprehensive income (loss) before reclassifications 0.2 (18.1) 0.1 (17.8) Amounts reclassified from accumulated other comprehensive loss — — (0.1) (0.1) Current-period other comprehensive income (loss) 0.2 (18.1) — (17.9) Balance, September 30, 2020 $ (2.5) $ (132.3) $ (0.1) $ (134.9) (In millions) Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments Hedging Activities Total Balance, December 31, 2018 $ (2.2) $ (117.8) $ — $ (120.0) Other comprehensive loss before reclassifications — (15.5) (0.1) (15.6) Amounts reclassified from accumulated other comprehensive loss — — 0.1 0.1 Current period other comprehensive loss — (15.5) — (15.5) Balance, September 30, 2019 $ (2.2) $ (133.3) $ — $ (135.5)

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Summary of Assumptions for Estimating the Fair Value of Stock Options	The following assumptions were utilized in the Black-Scholes option pricing model for estimating the fair value of GCP's stock options granted during the nine months ended September 30, 2019: Nine Months Ended September 30, Assumptions used to calculate expense for stock options: 2019 Risk-free interest rate 1.70 - 2.64% Average life of options (years) 5.5 - 6.5 Volatility 28.02 - 28.59% Dividend yield — Weighted average fair value per stock option $8.66
Summary of Stock Option Activity	The following table sets forth information relating to stock options denominated in GCP stock during the nine months ended September 30, 2020: Stock Option Activity Number Of Weighted Weighted Aggregated Outstanding, December 31, 2019 1,284 $ 22.66 3.18 $ 3,171 Options exercised (64) 17.80 Options forfeited/expired/canceled (289) 19.98 Outstanding, September 30, 2020 931 $ 23.82 3.39 $ 1,316 Exercisable, September 30, 2020 827 $ 23.23 3.17 $ 1,316 Vested and expected to vest, September 30, 2020 927 $ 23.80 3.38 $ 1,316
Summary of Restricted Stock Units Award Activity	The following table sets forth the RSU activity for the nine months ended September 30, 2020: RSU Activity Number Of Weighted Outstanding, December 31, 2019 156 $ 27.33 RSUs settled (151) 24.69 RSUs forfeited (2) 22.83 RSUs granted 191 21.13 RSUs outstanding, September 30, 2020 194 $ 23.21 Expected to vest as of September 30, 2020 181 $ 23.29
Schedule of Assumptions for Estimating the Fair Value of PBUs	The following table summarizes the assumptions used in the Monte Carlo simulations for estimating the grant date fair values of PBUs granted during the nine months ended September 30, 2020 and 2019: Nine Months Ended September 30, Assumptions used to calculate expense for PBUs: 2020 2019 Expected Term (Remaining Performance Period) 2.85 2.86 Expected volatility 29.85% 28.46% Risk-free interest rate 1.21% 2.48% Expected dividends — — Correlation coefficient 53.43% 54.81% Median correlation coefficient of constituents 54.01% 57.09%
Summary of Performance-Based Units Activity	The following table sets forth the PBU activity for the nine months ended September 30, 2020: PBU Activity Number Of Weighted Outstanding, December 31, 2019 382 $ 29.51 PBU's settled — — PBU's forfeited (167) 26.71 PBU's granted 147 22.43 Outstanding, September 30, 2020 362 $ 27.91

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Reconciliation of the Numerators and Denominators Used in Calculating Basic and Diluted Earnings Per Share	The following table sets forth a reconciliation of the numerators and denominators used in calculating basic and diluted earnings (loss) per share: Three Months Ended September 30, Nine Months Ended September 30, (In millions, except per share amounts) 2020 2019 2020 2019 Numerators Income from continuing operations attributable to GCP shareholders $ 99.5 $ 17.0 $ 99.6 $ 34.7 (Loss) income from discontinued operations, net of income taxes (0.1) (0.4) (0.4) 5.9 Net income attributable to GCP shareholders $ 99.4 $ 16.6 $ 99.2 $ 40.6 Denominators Weighted average common shares—basic calculation 73.0 72.7 72.9 72.5 Dilutive effect of employee stock awards (2) 0.2 0.1 0.2 0.4 Weighted average common shares—diluted calculation 73.2 72.8 73.1 72.9 Basic earnings (loss) per share: (2) Income from continuing operations attributable to GCP shareholders $ 1.36 $ 0.23 $ 1.37 $ 0.48 (Loss) income from discontinued operations, net of income taxes $ — $ (0.01) $ (0.01) $ 0.08 Net income attributable to GCP shareholders (1) $ 1.36 $ 0.23 $ 1.36 $ 0.56 Diluted earnings (loss) per share: (2) Income from continuing operations attributable to GCP shareholders $ 1.36 $ 0.23 $ 1.36 $ 0.48 (Loss) income from discontinued operations, net of income taxes $ — $ (0.01) $ (0.01) $ 0.08 Net income attributable to GCP shareholders (1) $ 1.36 $ 0.23 $ 1.36 $ 0.56 ________________________________ (1) Amounts may not sum due to rounding. (2) Dilutive effect is only applicable to the periods during which GCP generated net income from continuing operations.

Operating Segment and Geograp_2

Operating Segment and Geographic Information (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Schedule of Operating Segment Data	The following table presents information related to GCP's operating segments: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Net Sales Specialty Construction Chemicals $ 138.3 $ 151.8 $ 379.6 $ 433.9 Specialty Building Materials 110.1 115.1 280.9 321.3 Total net sales $ 248.4 $ 266.9 $ 660.5 $ 755.2 Segment Operating Income Specialty Construction Chemicals segment operating income $ 18.6 $ 19.8 $ 36.4 $ 41.9 Specialty Building Materials segment operating income 25.4 25.9 50.1 64.1 Total segment operating income $ 44.0 $ 45.7 $ 86.5 $ 106.0
Reconciliation of Operating Segment Data to Financial Statements	Total segment operating income for the three and nine months ended September 30, 2020 and 2019 is reconciled below to "Income from continuing operations before income taxes" presented in the accompanying unaudited Consolidated Statements of Operations: Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Total segment operating income (1) $ 44.0 $ 45.7 $ 86.5 $ 106.0 Corporate costs (7.6) (8.9) (19.7) (28.2) Certain pension costs (1.3) (2.0) (3.9) (5.9) Shareholder activism and other related costs (2) (2.1) (0.1) (9.5) (3.7) Gain on sale of corporate headquarters 110.2 — 110.2 — Gain on Brazil tax recoveries, net (3) — 0.9 — 0.9 Repositioning expenses (0.1) (4.4) (3.8) (15.6) Restructuring expenses and asset impairments (7.7) (3.8) (11.2) (8.8) Third-party and other acquisition-related costs — — (0.7) (0.1) Legacy product, environmental and other claims — — — (0.1) Net income attributable to noncontrolling interests 0.2 0.1 0.4 0.3 Interest expense, net (5.3) (4.9) (15.1) (15.0) Income from continuing operations before income taxes $ 130.3 $ 22.6 $ 133.2 $ 29.8 __________________________ (1) Certain amounts related to COVID-19 costs have been reclassified between segments' operating income and corporate expenses that do not get allocated directly to the segments. Such reclassifications have not materially affected previously reported amounts. (2) Shareholder activism and other related costs consist primarily of professional fees incurred in connection with the actions by certain of GCP shareholders seeking changes in the composition of the Company's Board of Directors and nomination of candidates to stand for election at the 2019 and 2020 Annual Shareholders' Meetings, as well as other related matters. (3) Gain on Brazil tax recoveries, net primarily consists of a $1.7 million pre-tax gain related to indirect tax recoveries, and $0.8 million of legal fees and other charges relating to indirect and income tax recoveries. Please refer to Note 8, "Income Taxes" and Note 11, "Commitments and Contingencies" for further information.
Net Sales by Geographic Area	The table below presents information related to the geographic areas in which GCP operates. Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2020 2019 2020 2019 Net Sales United States $ 132.5 $ 134.8 $ 351.8 $ 369.2 Canada and Other 8.7 9.1 20.9 24.0 Total North America 141.2 143.9 372.7 393.2 Europe Middle East Africa 47.4 50.7 126.3 149.4 Asia Pacific 47.4 56.8 127.4 166.4 Latin America 12.4 15.5 34.1 46.2 Total $ 248.4 $ 266.9 $ 660.5 $ 755.2

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2020
Discontinued Operations and Disposal Groups [Abstract]
Reconciliation of Gain on Disposal	The following table includes a reconciliation of the gain on the sale of the Darex business related to delayed close entities recorded during the nine months ended September 30, 2019: Nine Months Ended September 30, (In millions) 2019 Net proceeds included in gain $ 12.7 Net assets derecognized (3.1) Gain recognized before income taxes 9.6 Tax effect of gain recognized (2.4) Gain recognized after income taxes $ 7.2
Financial Results and Other Effects Related to Discontinued Operations	The following table sets forth the components of "(Loss) income from discontinued operations, net of income taxes" in the accompanying unaudited Consolidated Statements of Operations (1) : Three Months Ended September 30 Nine Months Ended September 30, (In millions) 2019 2020 2019 Net sales $ — $ — $ — Cost of goods sold — — — Gross profit — — — Selling, general and administrative expenses 0.2 0.2 1.1 Restructuring expenses and asset impairments 0.1 — 0.3 Gain on sale of business — — (9.6) Other expenses, net 0.1 0.2 0.1 (Loss) income from discontinued operations before income taxes (0.4) (0.4) 8.1 Provision for income taxes — — (2.2) (Loss) income from discontinued operations, net of income taxes $ (0.4) $ (0.4) $ 5.9 _____________________ (1) There was no material activity during the three months ended September 30, 2020.

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)segment	Sep. 30, 2019USD ($)	Jul. 03, 2017USD ($)
Class of Stock [Line Items]
Number of operating segments | segment			2
Net foreign currency transaction and remeasurement gains (losses)	$ 0.9		$ 1.7
Other Income, Net
Class of Stock [Line Items]
Loss recognized related to remeasurement of assets		$ 0.6		$ 0.9
Disposed of by Sale | Darex
Class of Stock [Line Items]
Consideration received					$ 1,060

Revenue from Lessor Arrangeme_3

Revenue from Lessor Arrangements and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Revenues [Abstract]
Lease component, lease term (or less)	30 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 172.8	$ 183.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation	$ 9.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction	5 years
Trade Accounts Receivable, Lease Revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 5.9	$ 5.6

Revenue from Lessor Arrangeme_4

Revenue from Lessor Arrangements and Contracts with Customers - Operating Lease and Service Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease revenue:
Total revenue	$ 248.4	$ 266.9	$ 660.5	$ 755.2
VERIFI Sales Arrangements
Lease revenue:
Lease payments revenue	7.1	6.5	20.9	19.7
Variable lease revenue	2.8	2.1	7.5	5.6
Total lease revenue	9.9	8.6	28.4	25.3
Total service revenue	2.1	1.4	5.4	3.5
Total revenue	12	10	33.8	28.8
VERIFI Sales Arrangements | Fixed fee revenue
Lease revenue:
Total service revenue	0.4	0	0.8	0.1
VERIFI Sales Arrangements | Variable fee revenue
Lease revenue:
Total service revenue	$ 1.7	$ 1.4	$ 4.6	$ 3.4

Accounts Receivable, Allowanc_3

Accounts Receivable, Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Credit Loss [Abstract]
Allowance for credit losses	$ 7.3	$ 7.3	$ 7.5	$ 6.5	$ 6.3	$ 5.8

Accounts Receivable, Allowanc_4

Accounts Receivable, Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 7.3	$ 6.3	$ 7.5	$ 5.8
Provision for expected credit losses	0.3	0.6	1	2.1
Write offs	(0.4)	(0.2)	(0.9)	(1.2)
Foreign currency translation adjustments	0.1	(0.2)	(0.3)	(0.2)
Ending balance	$ 7.3	$ 6.5	$ 7.3	$ 6.5

Inventories, net (Details)

Inventories, net (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Inventory [Line Items]
Raw materials	$ 39.3	$ 40
In process	4.6	4
Finished products and other	47.4	51.9
Total inventories, net	91.3	95.9
Finished Products Purchased
Inventory [Line Items]
Finished products and other	$ 9.6	$ 10.6

Derivative Instruments - Narrat

Derivative Instruments - Narrative (Details)	9 Months Ended
	Sep. 30, 2020EUR (€)derivative_instrument
Derivative [Line Items]
Number of contracts settled | derivative_instrument	1
Notional amount settled	€ 10,000,000
Foreign exchange forward contracts
Derivative [Line Items]
Number of derivative instruments | derivative_instrument	4
Aggregate notional amount	€ 40,000,000
Forward contract maturing 2021
Derivative [Line Items]
Aggregate notional amount	10,000,000
Forward contract maturing 2022
Derivative [Line Items]
Aggregate notional amount	10,000,000
Forward contract maturing 2023
Derivative [Line Items]
Aggregate notional amount	10,000,000
Forward contract maturing 2024
Derivative [Line Items]
Aggregate notional amount	€ 10,000,000

Derivative Instruments - Net In

Derivative Instruments - Net Investment Hedges in Balance Sheets (Details) - Foreign exchange forward contracts - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative assets	$ 0.7	$ 1.1
Derivative liability	(0.6)	0
Derivative assets, current	0.1	0.3
Derivative assets, noncurrent	$ 0.6	$ 0.8

Derivative Instruments - Net _2

Derivative Instruments - Net Investment Hedges in Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Gains (losses) on foreign exchange forward contracts - cumulative translation adjustments, net of tax benefit	$ 10.8	$ (14.9)	$ (18.1)	$ (15.5)
Foreign exchange forward contracts
Derivative [Line Items]
Gains (losses) on foreign exchange forward contracts - other income, net	0.2	0.2	0.8	0.3
Gains (losses) on foreign exchange forward contracts - cumulative translation adjustments, net of tax benefit	(1.5)	1.5	(1)	1.3
Gains (losses) on foreign exchange forward contracts - cumulative translation adjustments, tax (benefit) expense	$ 0.5	$ 0.5	$ 0.3	$ 0.4

Debt and Other Borrowings - Com

Debt and Other Borrowings - Components of Debt (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 352,900,000	$ 349,200,000
Less: debt payable within one year	4,100,000	2,700,000
Debt payable after one year	$ 348,800,000	$ 346,500,000
Weighted average interest rates on total debt obligations	5.50%	5.50%
Finance lease obligations	$ 2,900,000	$ 1,300,000
Senior Notes | 5.5% Senior Notes due in 2026
Debt Instrument [Line Items]
Total debt	$ 346,500,000	346,100,000
Stated interest rate	5.50%
Unamortized debt issuance cost	$ 3,500,000	3,900,000
Line of credit | Revolving credit facility
Debt Instrument [Line Items]
Total debt	0	0
Unamortized debt issuance cost	2,400,000	3,100,000
Aggregate available principal amount	350,000,000	350,000,000
Other borrowings
Debt Instrument [Line Items]
Total debt	6,400,000	3,100,000
Lines of credit and other borrowings
Debt Instrument [Line Items]
Total debt	$ 3,500,000	$ 1,800,000

Debt and Other Borrowings - Pri

Debt and Other Borrowings - Principal Maturities of Debt Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Remainder of 2020	$ 3.7
2021	0.7
2022	0.7
2023	0.7
2024	0.5
Thereafter	346.6
Total debt	$ 352.9	$ 349.2

Debt and Other Borrowings - Nar

Debt and Other Borrowings - Narrative (Details) - USD ($)	Oct. 15, 2020	Apr. 15, 2020	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Senior Notes | 5.5% Senior Notes due in 2026
Debt Instrument [Line Items]
Stated interest rate			5.50%	5.50%
Aggregate principal amount			$ 350,000,000	$ 350,000,000
Interest payment		$ 9,600,000
Unamortized debt issuance cost			3,500,000	3,500,000	$ 3,900,000
Senior Notes | 5.5% Senior Notes due in 2026 | Subsequent Event
Debt Instrument [Line Items]
Interest payment	$ 9,600,000
Line of Credit
Debt Instrument [Line Items]
Available credit			347,400,000	347,400,000	344,100,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings			0	0	0
Interest payments			0	0
Unamortized debt issuance cost			2,400,000	$ 2,400,000	3,100,000
Line of Credit | Revolving Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				0.50%
Line of Credit | Revolving Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				1.00%
Line of Credit | Revolving Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				1.50%
Line of Credit | Revolving Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				2.00%
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Outstanding borrowings			$ 2,600,000	$ 2,600,000	$ 5,900,000

Debt and Other Borrowings - Car

Debt and Other Borrowings - Carrying Amounts and Fair Values of Debt Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
5.5% Senior Notes due in 2026 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.50%
Carrying Amount
Debt Instrument [Line Items]
Long-term debt, fair value	$ 352.9	$ 349.2
Carrying Amount | Other borrowings
Debt Instrument [Line Items]
Long-term debt, fair value	6.4	3.1
Carrying Amount | 5.5% Senior Notes due in 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	346.5	346.1
Fair Value
Debt Instrument [Line Items]
Long-term debt, fair value	363.9	369.4
Fair Value | Other borrowings
Debt Instrument [Line Items]
Long-term debt, fair value	6.4	3.1
Fair Value | 5.5% Senior Notes due in 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	$ 357.5	$ 366.3

Lessee Arrangements - Lease Exp

Lessee Arrangements - Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease expense	$ 3.7	$ 2.9	$ 9.9	$ 9.3
Variable lease expense	1.9	1	4.3	3.5
Short-term lease expense	0.7	0.7	2.1	1.6
Total lease expense	$ 6.3	$ 4.6	$ 16.3	$ 14.4

Lessee Arrangements - Supplemen

Lessee Arrangements - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	Jan. 01, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2019	Jul. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		$ 8.8	$ 9.4
Operating lease right of use assets obtained in exchange for new lease obligations:		12.9	$ 44.5	$ 3.7
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201602Member
Operating lease right-of-use assets		$ 40.5				$ 29.3
IQHQ, L.P
Cash paid for amounts included in the measurement of lease liabilities:
Lease term					18 months
Operating lease right-of-use assets					$ 8.6
ASU 2016-02 - Topic 842
Cash paid for amounts included in the measurement of lease liabilities:
Operating lease right of use assets obtained in exchange for new lease obligations:	$ 40.8

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ 30.6	$ 5.5		$ 33.2	$ (5.2)
Effective tax rate	(23.50%)	(24.30%)		(24.90%)	(17.40%)
State tax expense due to sale of Cambridge site	$ 5.1			$ 5.1
Effect of tax rates in foreign jurisdictions	3.7			4.2
Tax expense, Tax Cuts and Jobs Act	5.8			6.3	$ 3.6
Transition Tax, tax benefit from the release of an uncertain tax position			$ 20.2		20.2
Transition Tax liability (release)				13		$ 20.2
Transition tax for accumulated foreign earnings, liability	28.4			28.4
Valuation allowance expense (benefit)	$ 0.1	$ (0.1)		$ 1	0.4
Foreign Tax Authority - Brazil
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)					$ (3)

Pension Plans and Other Postr_3

Pension Plans and Other Postretirement Benefit Plans - Net Funded Status of Over-Funded, Underfunded, and Unfunded Pension Plans (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Pension plans and other postretirement benefit plans
Overfunded defined benefit pension plans	$ 26.1	$ 25
Underfunded and unfunded defined benefit pension plans	(57)	(67.5)
Pension Plans
Pension plans and other postretirement benefit plans
Overfunded defined benefit pension plans	26.1	25
Underfunded and unfunded defined benefit pension plans	(57)	(67.5)
Pension liabilities included in other current liabilities	(0.7)	(1.2)
Net funded status	(31.6)	(43.7)
Underfunded defined benefit pension plans | Pension Plans
Pension plans and other postretirement benefit plans
Underfunded and unfunded defined benefit pension plans	(30.1)	(40.8)
Unfunded defined benefit pension plans | Pension Plans
Pension plans and other postretirement benefit plans
Underfunded and unfunded defined benefit pension plans	$ (26.9)	$ (26.7)

Pension Plans and Other Postr_4

Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost			$ 0.2	$ 0.1
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.5	$ 1.6	4.6	4.8
Interest cost	1.3	1.4	3.8	4.3
Expected return on plan assets	(1.6)	(1.6)	(4.9)	(4.8)
Amortization of prior service cost			0	0
Net periodic benefit cost (income)	1.2	1.4	3.5	4.3
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.3	0.7	0.7	2
Interest cost	1	1.4	3.1	4.1
Expected return on plan assets	(1.2)	(1.5)	(3.5)	(4.5)
Amortization of prior service cost			0.1	0
Net periodic benefit cost (income)	$ 0.1	$ 0.6	$ 0.4	$ 1.6

Pension Plans and Other Postr_5

Pension Plans and Other Postretirement Benefit Plans - Narrative (Details) - USD ($)	Jan. 01, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Pension plans and other postretirement benefit plans
Accumulated other comprehensive income, tax impact		$ 200,000		$ 200,000		$ 200,000
Defined contribution plan, costs				$ 200,000	$ 100,000
Defined contribution plan, percentage that the employer contributes of employee contributions under 401(k) plan	100.00%			100.00%
Defined contribution plan, maximum percentage of employee compensation match by employer to defined contribution plan				6.00%
Defined contribution plan, additional maximum percentage of employee compensation match by employer to defined contribution plan	2.00%
Defined contribution plan, vesting requirement	3 years
Defined contribution plan, costs		1,300,000	$ 1,100,000	$ 3,500,000	3,500,000
United States
Pension plans and other postretirement benefit plans
Defined contribution plan, costs		1,500,000	1,600,000	4,600,000	4,800,000
Non-U.S.
Pension plans and other postretirement benefit plans
Defined contribution plan, costs		300,000	700,000	700,000	2,000,000
Postretirement Health Care
Pension plans and other postretirement benefit plans
Long-term liability		2,200,000		2,200,000		2,200,000
Accumulated other comprehensive income		600,000		600,000		$ 700,000
Pension Plans | United States
Pension plans and other postretirement benefit plans
Employer contributions		15,000,000	0	15,700,000	0
Pension Plans | Non-U.S.
Pension plans and other postretirement benefit plans
Employer contributions		$ 300,000	$ 600,000	$ 1,100,000	$ 1,800,000

Other Balance Sheet Informati_3

Other Balance Sheet Information - Other Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Other Current Assets:
Non-trade receivables	$ 19.3	$ 22.1
Prepaid expenses and other current assets	11.6	13.4
Income taxes receivable	8.8	8.2
Total other current assets	$ 39.7	$ 43.7

Other Balance Sheet Informati_4

Other Balance Sheet Information - Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Other Current Liabilities:
Accrued customer volume rebates	$ 22.5			$ 28.4
Accrued compensation	21.5			16
Income taxes payable	25			10.4
Accrued interest	8.8			4.2
Pension liabilities	0.7			1.2
Restructuring liability	8.4	$ 2.8	$ 3.3	2.7
Other accrued liabilities	47.8			50.7
Total other current liabilities	$ 134.7			$ 113.6

Other Balance Sheet Informati_5

Other Balance Sheet Information - Additional Information (Details) - USD ($) $ in Millions	Jul. 31, 2020	May 04, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jul. 02, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Proceeds from sale of corporate headquarters	$ 122.5
Transaction costs related to sale of real estate	2.5
Gain on sale of corporate headquarters			$ (110.2)	$ 0	$ (110.2)	$ 0
Fair value hedge assets	133.6
Carrying value	20.9
Minimum monthly rental payments	0.6
Operating lease right-of-use assets			40.5		40.5			$ 29.3
IQHQ, L.P
Business Acquisition [Line Items]
Gain on sale of corporate headquarters	$ 110.2
Lease term	18 months
Lease renewal term							6 months
Operating lease right-of-use assets	$ 8.6
RIW Limited | Clydebridge Holdings
Business Acquisition [Line Items]
Percentage of stock acquired		100.00%
Clydebridge Holdings
Business Acquisition [Line Items]
Percentage of stock acquired		100.00%
Consideration transferred		$ 29.5
Cash acquired		10
Payments to acquire businesses		29.8
Working capital adjustments		0.3
Escrow released		$ 2.8
Escrow deposit released			$ 1.3		$ 1.3

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Reduction in Taxes
Loss Contingencies [Line Items]
Gain related to income tax settlement, net	$ 1.3
Legal fees and other charges related to tax settlement	$ 0.4
Amended Credit Agreement | Standby Letter of Credit
Loss Contingencies [Line Items]
Gross financial assurances issued and outstanding		$ 5.7	$ 5.9

Stockholders' Equity (Details)

Stockholders' Equity (Details)	Mar. 13, 2020	Mar. 15, 2019purchase_right$ / sharesshares	Sep. 30, 2020USD ($)$ / sharesshares	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)$ / sharesshares	Sep. 30, 2019USD ($)	Jul. 30, 2020USD ($)	Dec. 31, 2019$ / sharesshares
Schedule Of Equity [Line Items]
Common stock dividend, number of preferred share purchase rights for each share of common stock | purchase_right		1
Common stock, par value (in usd per share) | $ / shares		$ 0.01	$ 0.01		$ 0.01			$ 0.01
Preferred share purchase right, period after acquisition announcement after which rights become exercisable		10 days
Preferred share purchase right, minimum beneficial ownership percentage change for rights to become exercisable	20.00%	15.00%
Preferred share purchase right, minimum beneficial ownership percentage for grandfathered treatment	20.00%	15.00%
Preferred share purchase right, minimum ownership percentage at which existing rights become exercisable	0.001%	0.001%
Preferred stock, authorized (in shares) | shares		50,000,000
Preferred stock, par value (in usd per share) | $ / shares		$ 0.01
Share repurchase program, authorized amount | $							$ 100,000,000
Stock repurchased (in shares) | shares			0
Total stock compensation (benefit) expense | $			$ 3,300,000	$ 2,300,000	$ 5,600,000	$ 7,300,000
2019 Phase 2 Plan
Schedule Of Equity [Line Items]
Total stock compensation (benefit) expense | $			$ 1,800,000
Series A preferred stock
Schedule Of Equity [Line Items]
Preferred stock, authorized (in shares) | shares		10,000,000	10,000,000		10,000,000			10,000,000
Preferred stock, par value (in usd per share) | $ / shares		$ 0.01	$ 0.01		$ 0.01			$ 0.01

Stockholders' Equity - Changes

Stockholders' Equity - Changes (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity
Beginning balance	$ 515.2	$ 512.3	$ 541.1		$ 481.4
Net income	99.6	16.7	99.6		40.9
Share-based compensation	3.1	1.9	5.9	[1]	7.5
Exercise of stock options	0.4	0.1	1.1	[2]	5.1	[2]
Share repurchases	(1.1)	(0.1)	(1.4)	[3]	(3.3)	[3]
Current period other comprehensive loss	10.8	(14.8)	(17.9)		(15.5)
Dividends and other changes in noncontrolling interest	(0.1)
Ending balance	$ 627.9	$ 516.1	$ 627.9		$ 516.1
Common Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance (in shares)	73.3	73	73.2		72.4
Beginning balance	$ 0.7	$ 0.7	$ 0.7		$ 0.7
Issuance of common stock in connection with stock plans (in shares)	0.1		0.2	[2]	0.3	[2]
Ending balance (in shares)	73.5	73	73.5		73
Ending balance	$ 0.7	$ 0.7	$ 0.7		$ 0.7
Treasury Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance (in shares)	0.4	0.3	0.3		0.2
Beginning balance	$ (8.9)	$ (8)	$ (8.6)		$ (4.8)
Share repurchases	$ (1.1)	$ (0.1)	$ (1.4)	[3]	$ (3.3)	[3]
Ending balance (in shares)	0.4	0.3	0.4		0.3
Ending balance	$ (10)	$ (8.1)	$ (10)		$ (8.1)
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity
Beginning balance	56.9	50.2	53.4		39.6
Share-based compensation	3.1	1.9	5.9	[1]	7.5
Exercise of stock options	0.4	0.1	1.1	[2]	5.1	[2]
Ending balance	60.4	52.2	60.4		52.2
Accumulated Earnings
Increase (Decrease) in Stockholders' Equity
Beginning balance	610	587.9	610.2		563.9
Net income	99.4	16.6	99.2		40.6
Ending balance	709.4	604.5	709.4		604.5
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity
Beginning balance	(145.7)	(120.7)	(117)		(120)
Current period other comprehensive loss	10.8	(14.8)	(17.9)		(15.5)
Ending balance	(134.9)	(135.5)	(134.9)		(135.5)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity
Beginning balance	2.2	2.2	2.4		2
Net income	0.2	0.1	0.4		0.3
Dividends and other changes in noncontrolling interest	(0.1)
Ending balance	$ 2.3	$ 2.3	$ 2.3		$ 2.3
[1]	During the nine months ended September 30, 2020, $1.8 million of the stock-based compensation expense is included in "Restructuring expenses and asset impairments" related to accelerated vesting of stock options and RSUs due to the CEO's departure from the Company effective September 11, 2020 following Board approval.
[2]	The par value of common shares issued may not be included in the table due to rounding. Total share amounts for common stock and treasury stock may not sum due to rounding.
[3]	Refer to Note 15, “Stock Incentive Plans”, for further information.

Restructuring and Repositioni_3

Restructuring and Repositioning Expenses, Asset Impairments - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)segment	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Restructuring Cost and Reserve [Line Items]
Number of operating segments | segment	2
Restructuring liability | $	$ 8.4	$ 2.8	$ 3.3	$ 2.7
Minimum
Restructuring Cost and Reserve [Line Items]
Expected reduction in workforce, percent	8.00%
Maximum
Restructuring Cost and Reserve [Line Items]
Expected reduction in workforce, percent	10.00%

Restructuring and Repositioni_4

Restructuring and Repositioning Expenses, Asset Impairments - Estimated and Actual Costs (Details) $ in Millions	3 Months Ended
	Sep. 30, 2020USD ($)
2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	$ 12.6
Capital expenditures to date	2
2019 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	13
Estimated capital expenditures	2
2019 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	15
Estimated capital expenditures	3
2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Estimated capital expenditures	2
Cost to date	17.1
Capital expenditures to date	0.6
2019 Phase 2 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	30
2019 Phase 2 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	35
Severance/employee costs | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	0.9
Severance/employee costs | 2019 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	1
Severance/employee costs | 2019 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	2
Severance/employee costs | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	12.5
Decrease in expected costs	7
Restructuring costs	6.9
Severance/employee costs | 2019 Phase 2 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	19
Severance/employee costs | 2019 Phase 2 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	22
Asset Impairments/ Write Offs | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Estimated costs	1
Cost to date	0.9
Asset Impairments/ Write Offs | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Estimated costs	1
Cost to date	0.3
Decrease in expected costs	1
Other Associated Costs | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	0.3
Other Associated Costs | 2019 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	0
Other Associated Costs | 2019 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	1
Other Associated Costs | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	0
Other Associated Costs | 2019 Phase 2 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	3
Other Associated Costs | 2019 Phase 2 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	4
Total Restructuring | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	2.1
Decrease in expected costs	2
Total Restructuring | 2019 Plan | Specialty Construction Chemicals
Restructuring Cost and Reserve [Line Items]
Cost to date	1.7
Total Restructuring | 2019 Plan | Specialty Building Materials
Restructuring Cost and Reserve [Line Items]
Cost to date	0.4
Total Restructuring | 2019 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	2
Total Restructuring | 2019 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	4
Total Restructuring | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	12.8
Total Restructuring | 2019 Phase 2 Plan | Specialty Construction Chemicals
Restructuring Cost and Reserve [Line Items]
Cost to date	3.6
Total Restructuring | 2019 Phase 2 Plan | Specialty Building Materials
Restructuring Cost and Reserve [Line Items]
Cost to date	2.3
Total Restructuring | 2019 Phase 2 Plan | Corporate Segment
Restructuring Cost and Reserve [Line Items]
Cost to date	6.9
Total Restructuring | 2019 Phase 2 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	23
Total Restructuring | 2019 Phase 2 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	27
Repositioning | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	10.5
Capital expenditures to date	10.4
Repositioning | 2019 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	11
Repositioning | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	4.3
Capital expenditures to date	4.2
Repositioning | 2019 Phase 2 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	7
Repositioning | 2019 Phase 2 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	8
Accelerated Vesting Of Stock Options And RSUs | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1.8

Restructuring and Repositioni_5

Restructuring and Repositioning Expenses, Asset Impairments - Repositioning and Restructuring (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 5.9	$ 0.2	$ 2.1
Cash paid	0.3	$ 0.7	$ 1.3
2019 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.1			$ 3.1	$ 1.7	$ 6.4
Cash paid	0.3			1.3	4.8	3.4
2019 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.3			0.1	1.2	0.4
Cash paid	0.5			0.1	1.3	0.3
2019 Plan Phase 2, Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0			0.4	1.9	0.4
Cash paid	0.4			0	3.2	0
2019 Plan Phase 2, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.2			0	0.5	0
Cash paid	0.2			0	0.4	0
Strategic Alternatives Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0			0.3	0	2.8
Cash paid	0.1			0.5	1.1	0.5
Strategic Alternatives, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0			0	0	0
Cash paid	0			0	0	0
2018 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0			0.2	0.1	5.3
Cash paid	0			0.2	0	7.9
2018 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.1			0.1	0.6	0.8
Cash paid	0.3			0.8	0.7	0.8
2017 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0			0.4	0.1	0.7
Cash paid	0			0.2	0.2	1.7
2017 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.2			2	1.1	3.9
Cash paid	0.4			0.9	1.6	2
Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.1			4.4	3.8	15.6
Cash paid	0.8			2.2	9.3	13.5
Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.8			2.2	3.4	5.1
Cash paid	$ 1.4			$ 1.8	$ 4	$ 3.1

Restructuring and Repositioni_6

Restructuring and Repositioning Expenses, Asset Impairments - Cumulative (Details) $ in Millions	Sep. 30, 2020USD ($)
2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	$ 12.6
Capital expenditures to date	2
2019 Plan | Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	10.5
Capital expenditures to date	10.4
2019 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Cost to date	2
Capital expenditures to date	1.9
2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	17.1
Capital expenditures to date	0.6
2019 Phase 2 Plan | Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	4.3
Capital expenditures to date	4.2
2019 Plan Phase 2, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Cost to date	0.6
Capital expenditures to date	0.4
Strategic Alternatives Plan | Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	3.1
Capital expenditures to date	3.1
Strategic Alternatives, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Cost to date	0
Capital expenditures to date	0
2018 Plan, Repositioning | Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	10.7
Capital expenditures to date	10.7
2018 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Cost to date	1.5
Capital expenditures to date	1.5
2017 Plan, Repositioning | Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	9.7
Capital expenditures to date	9.6
2017 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Cost to date	13.5
Capital expenditures to date	$ 12.9

Restructuring and Repositioni_7

Restructuring and Repositioning Expenses, Asset Impairments - Restructuring Expenses and Asset Impairments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Severance and other employee costs	$ 7.7	$ 3.6	$ 9.6	$ 4.1
Asset impairments	0	0.1	1.2	4.1
Other associated costs	0	0.2	0.4	0.9
Total restructuring expenses and asset impairments	7.7	3.9	11.2	9.1
Less: restructuring expenses and asset impairments reflected in discontinued operations	0	0.1	0	0.3
Total restructuring expenses and asset impairments from continuing operations	$ 7.7	$ 3.8	$ 11.2	$ 8.8

Restructuring and Repositioni_8

Restructuring and Repositioning Expenses, Asset Impairments - Restructuring Costs by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses and asset impairments from continuing operations	$ 7.7	$ 3.8	$ 11.2	$ 8.8
Restructuring expenses and asset impairments reflected in discontinued operations	0	0.1	0	0.3
Total restructuring expenses and asset impairments	7.7	3.9	11.2	9.1
Operating Segments | SCC
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses and asset impairments from continuing operations	0.6	1.5	3.2	3.4
Operating Segments | SBM
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses and asset impairments from continuing operations	0.2	0.7	1.1	3.9
Corporate
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses and asset impairments from continuing operations	$ 6.9	$ 1.6	$ 6.9	$ 1.5

Restructuring and Repositioni_9

Restructuring and Repositioning Expenses, Asset Impairments - Restructuring Liability (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Reserve [Roll Forward]
Beginning balance	$ 2.8	$ 3.3	$ 2.7		$ 2.7
Expense	5.9	0.2	2.1
Payments	(0.3)	(0.7)	(1.3)
Impact of foreign currency and other			(0.2)
Ending balance	8.4	2.8	3.3		8.4
Total stock compensation (benefit) expense	3.3			$ 2.3	5.6	$ 7.3
2019 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.2	0.3	0.2		0.2
Expense	0	0	0.2
Payments	(0.1)	(0.1)	(0.1)
Impact of foreign currency and other			0
Ending balance	0.1	0.2	0.3		0.1
2019 Plan | Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.2	0.2	0		0
Expense	0	0.1	0.2
Payments	(0.1)	(0.1)	0
Impact of foreign currency and other			0
Ending balance	0.1	0.2	0.2		0.1
2019 Plan | Asset Impairments/ Write Offs | Specialty Construction Chemicals
Restructuring Reserve [Roll Forward]
Expense					1.1
2019 Plan | Asset Impairments/ Write Offs | Specialty Building Materials
Restructuring Reserve [Roll Forward]
Expense	0.1				0.1
2019 Phase 2 Plan
Restructuring Reserve [Roll Forward]
Total stock compensation (benefit) expense	1.8
2019 Phase 2 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	1.7	2	0.9		0.9
Expense	5.9	0	1.7
Payments	0	(0.3)	(0.6)
Impact of foreign currency and other			0
Ending balance	7.6	1.7	2		7.6
2018 Plan, Repositioning
Restructuring Reserve [Roll Forward]
Expense	0			0.2	0.1	5.3
Payments	0			(0.2)	0	(7.9)
2018 Plan, Repositioning | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.6	0.7	1		1
Expense	0	0	0
Payments	(0.1)	(0.1)	(0.2)
Impact of foreign currency and other			(0.1)
Ending balance	0.5	0.6	0.7		0.5
2018 Plan, Repositioning | Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0.4		0.4
Expense	0	0.1	0
Payments	0	(0.1)	(0.3)
Impact of foreign currency and other			(0.1)
Ending balance	0	0	0		0
2017 Plan, Repositioning
Restructuring Reserve [Roll Forward]
Expense	0			0.4	0.1	0.7
Payments	0			$ (0.2)	(0.2)	$ (1.7)
2017 Plan, Repositioning | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.1	0.1	0.2		0.2
Expense	0	0	0
Payments	0	0	(0.1)
Impact of foreign currency and other			0
Ending balance	$ 0.1	$ 0.1	$ 0.1		$ 0.1

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) - Components of OCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	$ 10.3	$ (14.3)	$ (18.2)	$ (15.1)
Tax Benefit (Expense)	0.5	(0.5)	0.3	(0.4)
Total other comprehensive income (loss)	10.8	(14.8)	(17.9)	(15.5)
Defined benefit pension and other postretirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	0.1		0.2
Tax Benefit (Expense)	0		0
Total other comprehensive income (loss)	0.1		0.2	0
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	10.3	(14.4)	(18.4)	(15.1)
Tax Benefit (Expense)	0.5	(0.5)	0.3	(0.4)
Total other comprehensive income (loss)	10.8	(14.9)	$ (18.1)	$ (15.5)
Gain (loss) from hedging activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	(0.1)	0.1
Tax Benefit (Expense)	0	0
Total other comprehensive income (loss)	$ (0.1)	$ 0.1

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) - Changes in AOCI, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	$ 515.2	$ 512.3	$ 541.1	$ 481.4
Other comprehensive loss before reclassifications			(17.8)	(15.6)
Amounts reclassified from accumulated other comprehensive loss			(0.1)	0.1
Total other comprehensive income (loss)	10.8	(14.8)	(17.9)	(15.5)
Ending balance	627.9	516.1	627.9	516.1
Defined Benefit Pension and Other Postretirement Plans
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			(2.7)	(2.2)
Other comprehensive loss before reclassifications			0.2	0
Amounts reclassified from accumulated other comprehensive loss			0	0
Total other comprehensive income (loss)	0.1		0.2	0
Ending balance	(2.5)	(2.2)	(2.5)	(2.2)
Currency Translation Adjustments
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			(114.2)	(117.8)
Other comprehensive loss before reclassifications			(18.1)	(15.5)
Amounts reclassified from accumulated other comprehensive loss			0	0
Total other comprehensive income (loss)			(18.1)	(15.5)
Ending balance	(132.3)	(133.3)	(132.3)	(133.3)
Hedging Activities
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			(0.1)	0
Other comprehensive loss before reclassifications			0.1	(0.1)
Amounts reclassified from accumulated other comprehensive loss			(0.1)	0.1
Total other comprehensive income (loss)			0	0
Ending balance	(0.1)	0	(0.1)	0
Total
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(145.7)	(120.7)	(117)	(120)
Total other comprehensive income (loss)	10.8	(14.8)	(17.9)	(15.5)
Ending balance	$ (134.9)	$ (135.5)	$ (134.9)	$ (135.5)

Stock Incentive Plans - Narrati

Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved and available for future grant (in shares)		7,600,000		7,600,000
Total stock compensation (benefit) expense		$ 3.3	$ 2.3	$ 5.6		$ 7.3
Share repurchases (in shares)				62,200		130,900
Share repurchases		$ 1.1	$ 0.1	$ 1.4	[1]	$ 3.3	[1]
Cash payments for tax withholding obligations				$ 0.4		3.3
Grants in period (in shares)		0		0
Weighted average grant date fair value of options granted (in usd per share)			$ 6.66
Intrinsic value of all options exercised		$ 0.2		$ 0.3		2.5
Fair value of awards vested				$ 3.4		$ 6.4
Performance period				3 years
Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved and available for future grant (in shares)		500,000		500,000
2019 Phase 2 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation (benefit) expense		$ 1.8
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted, value	$ 5
Subsequent Event | Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved and available for future grant (in shares)	1,000,000
Restricted Stock | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (in shares)	143,128
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense for stock options		0.1		$ 0.1
Unrecognized stock-based compensation expense for stock options, period of recognition				8 months 12 days
Stock Option | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (in shares)	388,348
Restricted Stock Units (RSUs) and Performance Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense for stock options, period of recognition				1 year 8 months 12 days
Total unrecognized compensation expense related to the RSU and PBU awards		$ 4.4		$ 4.4
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in usd per share)		$ 22.82	$ 21.52	$ 21.13		$ 26.77
Amount settled in period (in shares)				151,000		255,000
Performance Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in usd per share)				$ 22.43		$ 27.19
Amount settled in period (in shares)						76,461
Fair value of awards vested						$ 2
Award vesting period				3 years
Performance Based Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout, percent of target				0.00%
Performance Based Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout, percent of target				200.00%
[1]	Refer to Note 15, “Stock Incentive Plans”, for further information.

Stock Incentive Plans - Stock O

Stock Incentive Plans - Stock Options, Valuation Assumptions (Details) - Stock Option	9 Months Ended
	Sep. 30, 2019$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	1.70%
Risk-free interest rate, maximum	2.64%
Volatility, minimum	28.02%
Volatility, maximum	28.59%
Dividend yield	0.00%
Weighted average fair value per stock option (in usd per share)	$ 8.66
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average life of options	5 years 6 months
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average life of options	6 years 6 months

Stock Incentive Plans - Stock_2

Stock Incentive Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares)	1,284
Options exercised (in shares)	(64)
Options forfeited/expired/canceled (in shares)	(289)
Outstanding, ending balance (in shares)	931	1,284
Exercisable, end of period (in shares)	827
Vested and expected to vest, end of period (in shares)	927
Weighted Average Exercise Price
Outstanding, beginning balance (in usd per share)	$ 22.66
Options exercised (in usd per share)	17.80
Options forfeited/expired/canceled (in usd per share)	19.98
Outstanding, ending balance (in usd per share)	23.82	$ 22.66
Exercisable, end of period (in usd per share)	23.23
Vested and expected to vest, end of period (in usd per share)	$ 23.80
Other Disclosures
Outstanding, weighted-average remaining contractual term	3 years 4 months 20 days	3 years 2 months 4 days
Exercisable, weighted-average remaining contractual term	3 years 2 months 1 day
Vested and expected to vest, weighted-average remaining contractual term	3 years 4 months 17 days
Outstanding, aggregated intrinsic value	$ 1,316	$ 3,171
Exercisable, aggregated intrinsic value	1,316
Vested and expected to vest, aggregated intrinsic value	$ 1,316

Stock Incentive Plans - Restric

Stock Incentive Plans - Restricted Stock Units Award Activity (Details) - Restricted Stock Units (RSUs) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares)			156
Settled (in shares)			(151)
Forfeited (in shares)			(2)
Granted (in shares)			191
Outstanding, ending balance (in shares)	194		194
RSUs expected to vest (in shares)	181		181
Weighted Average Grant Date Fair Value
Outstanding, beginning balance (in usd per share)			$ 27.33
Settled (in usd per share)			24.69
Forfeited (in used per share)			22.83
Granted (in usd per share)	$ 22.82	$ 21.52	21.13	$ 26.77
Outstanding, ending balance (in usd per share)	23.21		23.21
RSUs expected to vest (in usd per share)	$ 23.29		$ 23.29

Stock Incentive Plans - PBUs, V

Stock Incentive Plans - PBUs, Valuation Assumptions (Details) - Performance Based Units	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Term (Remaining Performance Period)	2 years 10 months 6 days	2 years 10 months 9 days
Expected volatility	29.85%	28.46%
Risk-free interest rate	1.21%	2.48%
Expected dividends	0.00%	0.00%
Correlation coefficient	53.43%	54.81%
Median correlation coefficient of constituents	54.01%	57.09%

Stock Incentive Plans - Perform

Stock Incentive Plans - Performance Based Units Award Activity (Details) - Performance Based Units - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares)	382
Settled (in shares)	0
Forfeited (in shares)	(167)
Granted (in shares)	147
Outstanding, ending balance (in shares)	362
Weighted Average Grant Date Fair Value
Outstanding, beginning balance (in usd per share)	$ 29.51
Settled (in usd per share)	0
Forfeited (in used per share)	26.71
Granted (in usd per share)	22.43	$ 27.19
Outstanding, ending balance (in usd per share)	$ 27.91

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerators
Income from continuing operations attributable to GCP shareholders		$ 99.5	$ 17	$ 99.6	$ 34.7
(Loss) income from discontinued operations, net of income taxes		(0.1)	(0.4)	(0.4)	5.9
Net income attributable to GCP shareholders		$ 99.4	$ 16.6	$ 99.2	$ 40.6
Denominators
Weighted average common shares—basic calculation (in shares)	[1]	73	72.7	72.9	72.5
Dilutive effect of employee stock awards (in shares)		0.2	0.1	0.2	0.4
Weighted average common shares—diluted calculation (in shares)	[1]	73.2	72.8	73.1	72.9
Basic earnings (loss) per share:
Income from continuing operations attributable to GCP shareholders (in usd per share)	[1]	$ 1.36	$ 0.23	$ 1.37	$ 0.48
(Loss) income from discontinued operations, net of income taxes (in usd per share)	[1]	0	(0.01)	(0.01)	0.08
Net income attributable to GCP shareholders (in usd per share)	[1],[2]	1.36	0.23	1.36	0.56
Diluted earnings (loss) per share
Income from continuing operations attributable to GCP shareholders (in dollars per share)	[1]	1.36	0.23	1.36	0.48
(Loss) income from discontinued operations, net of income taxes (in dollars per share)	[1]	0	(0.01)	(0.01)	0.08
Net income attributable to GCP shareholders (in dollars per share)	[1],[2]	$ 1.36	$ 0.23	$ 1.36	$ 0.56
Antidilutive securities excluded from computation of earnings per share, treasury stock method (in shares)		0.6	0.8	0.6	0.6
[1]	Dilutive effect is only applicable to the periods during which GCP generated net income from continuing operations.
[2]	Amounts may not sum due to rounding.

Related Party Transactions an_2

Related Party Transactions and Transactions with Grace (Details) $ in Millions	Sep. 30, 2020USD ($)	Jul. 16, 2020USD ($)	Jul. 02, 2020USD ($)	May 28, 2020derivative_instrument	Dec. 31, 2019USD ($)	Jun. 30, 2020derivative_instrument
W.R. Grace & Co. | Other Assets
Related Party Transaction [Line Items]
Indemnified receivables, tax	$ 3.7				$ 3.5
W.R. Grace & Co. | Other Current Liabilities
Related Party Transaction [Line Items]
Indemnified payables, tax	$ 0.9				$ 1
Starboard
Related Party Transaction [Line Items]
Number of directors appointed by noncontrolling interest | derivative_instrument				8		8
Reimbursement of director fees, maximum			$ 2
Reimbursement of director fees		$ 2
GCP Applied Technologies | Starboard
Related Party Transaction [Line Items]
Noncontrolling interest ownership percentage						9.00%

Operating Segment and Geograp_3

Operating Segment and Geographic Information - Narrative (Details)	9 Months Ended
	Sep. 30, 2020segment
Segment Reporting [Abstract]
Number of operating segments	2

Operating Segment and Geograp_4

Operating Segment and Geographic Information - Schedule of Operating Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net Sales
Net sales	$ 248.4	$ 266.9	$ 660.5	$ 755.2
Segment Operating Income
Operating income		45.7	86.5	106
Specialty Construction Chemicals
Net Sales
Net sales	138.3	151.8	379.6	433.9
Segment Operating Income
Operating income	18.6	19.8	36.4	41.9
Specialty Building Materials
Net Sales
Net sales	110.1	115.1	280.9	321.3
Segment Operating Income
Operating income	$ 25.4	$ 25.9	$ 50.1	$ 64.1

Operating Segment and Geograp_5

Operating Segment and Geographic Information - Reconciliation of Segment Data to Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Operating income		$ 45.7	$ 86.5	$ 106
Corporate costs	$ (65.2)	(66.3)	(199)	(206.7)
Gain on sale of corporate headquarters	110.2	0	110.2	0
Repositioning expenses	(0.1)	(4.4)	(3.8)	(15.6)
Restructuring expenses and asset impairments	(7.7)	(3.8)	(11.2)	(8.8)
Net income attributable to noncontrolling interests	0.2	0.1	0.4	0.3
Income from continuing operations before income taxes	130.3	22.6	133.2	29.8
Reduction in taxes
Segment Reporting Information [Line Items]
Gain on Brazil tax recoveries, net		1.3
Gain on Brazil tax recoveries, net				1.7
Amount awarded from other party				0.8
Operating Segments
Segment Reporting Information [Line Items]
Operating income	44	45.7		106
Corporate
Segment Reporting Information [Line Items]
Corporate costs	(7.6)	(8.9)	(19.7)	(28.2)
Restructuring expenses and asset impairments	(6.9)	(1.6)	(6.9)	(1.5)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Certain pension costs	(1.3)	(2)	(3.9)	(5.9)
Shareholder activism and other related costs	(2.1)	(0.1)	(9.5)	(3.7)
Gain on Brazil tax recoveries, net	0	0.9	0	0.9
Repositioning expenses	(0.1)	(4.4)	(3.8)	(15.6)
Restructuring expenses and asset impairments	(7.7)	(3.8)	(11.2)	(8.8)
Third-party and other acquisition-related costs	0	0	(0.7)	(0.1)
Legacy product, environmental and other claims	0	0	0	(0.1)
Net income attributable to noncontrolling interests	0.2	0.1	0.4	0.3
Interest expense, net	$ (5.3)	$ (4.9)	$ (15.1)	$ (15)

Operating Segment and Geograp_6

Operating Segment and Geographic Information - Geographic Area Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 248.4	$ 266.9	$ 660.5	$ 755.2
Total North America
Segment Reporting Information [Line Items]
Net sales	141.2	143.9	372.7	393.2
United States
Segment Reporting Information [Line Items]
Net sales	132.5	134.8	351.8	369.2
Canada and Other
Segment Reporting Information [Line Items]
Net sales	8.7	9.1	20.9	24
Europe Middle East Africa
Segment Reporting Information [Line Items]
Net sales	47.4	50.7	126.3	149.4
Asia Pacific
Segment Reporting Information [Line Items]
Net sales	47.4	56.8	127.4	166.4
Latin America
Segment Reporting Information [Line Items]
Net sales	$ 12.4	$ 15.5	$ 34.1	$ 46.2

Discontinued Operations - Narra

Discontinued Operations - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019	Jul. 03, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-current assets held for sale		$ 0	$ 500,000
Disposed of by Sale | Darex
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received/receivable for disposal				$ 1,060,000,000
After-tax gain on sale	$ 7,200,000
Non-current assets held for sale		0	500,000
Tax effect of gain recognized	$ 2,400,000
Indemnification payable		1,000,000	900,000
Disposed of by Sale | Darex | Other Current Liabilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, deferred consideration		$ 0	$ 500,000

Discontinued Operations - Recon

Discontinued Operations - Reconciliation of Gain on Disposal (Details) - Darex - Disposed of by Sale $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds included in gain	$ 12.7
Net assets derecognized	(3.1)
Gain recognized before income taxes	9.6
Tax effect of gain recognized	(2.4)
Gain recognized after income taxes	$ 7.2

Discontinued Operations - Incom

Discontinued Operations - Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of income taxes	$ (0.1)	$ (0.4)	$ (0.4)	$ 5.9
Darex | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		0	0	0
Cost of goods sold		0	0	0
Gross profit		0	0	0
Selling, general and administrative expenses		0.2	0.2	1.1
Restructuring expenses and asset impairments		0.1	0	0.3
Gain on sale of business		0	0	(9.6)
Other expenses, net		0.1	0.2	0.1
(Loss) income from discontinued operations before income taxes		(0.4)	(0.4)	8.1
Provision for income taxes		0	0	(2.2)
(Loss) income from discontinued operations, net of income taxes		$ (0.4)	$ (0.4)	$ 5.9