GCP Applied (GCP) 10-Q5 Nov 212021 Q3 Quarterly reportFinancial data

Company Profile

Cover

Cover - shares	9 Months Ended
Cover - shares	Sep. 30, 2021	Oct. 31, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
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	2325 Lakeview Parkway
Entity Address, City or Town	Alpharetta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30009
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		73,506,691
Entity Central Index Key	0001644440
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 249.6	$ 248.4	$ 725.8	$ 660.5
Cost of goods sold	165.1	146.6	461.7	398.5
Gross profit	84.5	101.8	264.1	262
Selling, general and administrative expenses	59.2	64.7	190	198.8
Restructuring and repositioning expenses	6.7	7.8	22.6	15
Interest expense and related financing costs	5.6	5.6	16.8	16.3
Gain on sale of corporate headquarters	0	(110.2)	0	(110.2)
Other expense, net	3.6	2.7	5.2	6.4
Total costs (income)	75.1	(29.4)	234.6	126.3
Income from continuing operations before income taxes	9.4	131.2	29.5	135.7
Income tax expense	(1.6)	(31)	(9.6)	(34)
Income from continuing operations	7.8	100.2	19.9	101.7
Loss from discontinued operations, net of income taxes	(0.1)	(0.1)	(0.3)	(0.4)
Net income	7.7	100.1	19.6	101.3
Less: Net income attributable to noncontrolling interests	0	(0.2)	(0.2)	(0.4)
Net income attributable to GCP shareholders	7.7	99.9	19.4	100.9
Amounts Attributable to GCP Shareholders:
Net income from continuing operations attributable to GCP shareholders	7.8	100	19.7	101.3
Loss from discontinued operations, net of income taxes	(0.1)	(0.1)	(0.3)	(0.4)
Net income attributable to GCP shareholders	$ 7.7	$ 99.9	$ 19.4	$ 100.9
Basic earnings per share:
Income from continuing operations attributable to GCP shareholders (in usd per share)	$ 0.11	$ 1.37	$ 0.27	$ 1.39
Loss from discontinued operations, net of income taxes (in usd per share)	(0.01)	0	(0.01)	(0.01)
Net income attributable to GCP shareholders (in usd per share)	$ 0.10	$ 1.37	$ 0.26	$ 1.38
Weighted average number of basic shares (in shares)	73.5	73	73.3	72.9
Diluted earnings per share:
Income from continuing operations attributable to GCP shareholders (in usd per share)	$ 0.11	$ 1.36	$ 0.27	$ 1.39
Loss from discontinued operations, net of income taxes (in usd per share)	(0.01)	0	(0.01)	(0.01)
Net income attributable to GCP shareholders (in usd per share)	$ 0.10	$ 1.36	$ 0.26	$ 1.38
Weighted average number of diluted shares (in shares)	73.6	73.2	73.5	73.1

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 7.7	$ 100.1	$ 19.6	$ 101.3
Other comprehensive (loss) income:
Defined benefit pension and postretirement plans	0	0.1	0.1	0.2
Currency translation adjustments	(12.4)	10.3	(15.2)	(18.4)
Income tax effect	(0.2)	0.5	(0.5)	0.3
Loss from hedging activities	0.1	(0.1)	0.1	0
Total other comprehensive (loss) income	(12.5)	10.8	(15.5)	(17.9)
Comprehensive (loss) income	(4.8)	110.9	4.1	83.4
Less: Comprehensive income attributable to noncontrolling interests	0	(0.2)	(0.2)	(0.4)
Comprehensive (loss) income attributable to GCP shareholders	$ (4.8)	$ 110.7	$ 3.9	$ 83

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 481.5	$ 482.7
Trade accounts receivable, net	168.5	169.4
Inventories	130	98.4
Other current assets	50.4	41.2
Total Current Assets	830.4	791.7
Properties and equipment, net	215.1	225.6
Goodwill	209.7	215
Technology and other intangible assets, net	63.2	70.9
Other assets	121.7	114.4
Total Assets	1,440.1	1,417.6
Current Liabilities
Current maturities of long-term debt	2.7	2.8
Accounts payable	90.9	87.8
Other current liabilities	126.4	133.8
Total Current Liabilities	220	224.4
Long-term debt	348.9	348.9
Defined benefit pension plans	64.9	62.9
Unrecognized tax benefits	41.2	41
Income taxes payable	24.1	28.4
Other liabilities	74.3	57.9
Total Liabilities	773.4	763.5
Commitments and Contingencies
Stockholders’ Equity
Preferred stock, par value $0.01; 50,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock issued, par value $0.01; 300,000,000 shares authorized; outstanding: 73,505,485 and 73,082,066, respectively	0.7	0.7
Paid-in capital	72	61.9
Accumulated earnings	729.7	710.3
Accumulated other comprehensive loss	(126)	(110.5)
Treasury stock	(12.3)	(10.7)
Total GCP’s Shareholders’ Equity	664.1	651.7
Noncontrolling interests	2.6	2.4
Total Stockholders’ Equity	666.7	654.1
Total Liabilities and Stockholders’ Equity	$ 1,440.1	$ 1,417.6

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	50,000,000	50,000,000
Preferred stock, outstanding (in shares)	0	0
Preferred stock, shares issued (in shares)	0	0
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)	73,505,485	73,082,066

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders’ Equity (unaudited) - USD ($) $ in Millions	Total	Common stock	Additional paid-in-capital	Accumulated Earnings	Accumulated other comprehensive loss	Treasury stock	Non-controlling interests
Beginning balance at Dec. 31, 2019	$ 541.1	$ 0.7	$ 53.4	$ 610.2	$ (117)	$ (8.6)	$ 2.4
Increase (Decrease) in Stockholders' Equity
Change in common stock at par value		0
Share-based compensation			5.9
Exercise of stock options	1.1		1.1
Net income attributable to GCP shareholders	101.3			100.9			0.4
Other comprehensive (loss) income	(17.9)				(17.9)
Share repurchases	(1.4)					(1.4)
Dividends and other changes							(0.5)
Ending balance at Sep. 30, 2020	629.6	0.7	60.4	711.1	(134.9)	(10)	2.3
Beginning balance at Jun. 30, 2020	516.4	0.7	56.9	611.2	(145.7)	(8.9)	2.2
Increase (Decrease) in Stockholders' Equity
Change in common stock at par value		0
Share-based compensation			3.1
Exercise of stock options	0.4		0.4
Net income attributable to GCP shareholders	100.1			99.9			0.2
Other comprehensive (loss) income	10.8				10.8
Share repurchases	(1.1)					(1.1)
Dividends and other changes							(0.1)
Ending balance at Sep. 30, 2020	629.6	0.7	60.4	711.1	(134.9)	(10)	2.3
Beginning balance at Dec. 31, 2020	654.1	0.7	61.9	710.3	(110.5)	(10.7)	2.4
Increase (Decrease) in Stockholders' Equity
Change in common stock at par value		0
Share-based compensation			5.5
Exercise of stock options			4.6
Net income attributable to GCP shareholders	19.6			19.4			0.2
Other comprehensive (loss) income	(15.5)				(15.5)
Share repurchases						(1.6)
Dividends and other changes							0
Ending balance at Sep. 30, 2021	666.7	0.7	72	729.7	(126)	(12.3)	2.6
Beginning balance at Jun. 30, 2021		0.7	70.2	722	(113.5)	(12.3)	2.6
Increase (Decrease) in Stockholders' Equity
Change in common stock at par value		0
Share-based compensation			1.5
Exercise of stock options			0.3
Net income attributable to GCP shareholders	7.7			7.7			0
Other comprehensive (loss) income	(12.5)				(12.5)
Share repurchases						0
Dividends and other changes							0
Ending balance at Sep. 30, 2021	$ 666.7	$ 0.7	$ 72	$ 729.7	$ (126)	$ (12.3)	$ 2.6

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES
Net income	$ 19.6	$ 101.3
Less: Loss from discontinued operations	(0.3)	(0.4)
Income from continuing operations	19.9	101.7
Reconciliation to net cash provided by operating activities
Depreciation and amortization	33.7	34.5
Deferred income taxes	(5.7)	21.9
Stock-based compensation expense	4.4	3.8
Unrealized loss on foreign currency	2.3	2.7
Amortization of debt discount and financing costs	1.1	1.1
Loss (gain) on disposal of property and equipment	0.8	(109.7)
Changes in assets and liabilities, excluding effect of currency translation
Trade accounts receivable	(4.2)	8.6
Inventories	(34.4)	3.2
Accounts payable	5.4	(3.9)
Pension and postretirement plans, net	3	(12.4)
Other assets and liabilities, net	(0.5)	7.8
Net cash provided by operating activities from continuing operations	25.8	59.3
Net cash used in operating activities from discontinued operations	(0.3)	(2.5)
Net cash provided by operating activities	25.5	56.8
INVESTING ACTIVITIES
Capital expenditures	(23.9)	(28)
Proceeds from sale of corporate headquarters, net of transaction costs	0	122.5
Other investing activities	0.1	0.4
Net cash (used in) provided by investing activities from continuing operations	(23.8)	94.9
FINANCING ACTIVITIES
Proceeds from exercise of stock options	4.6	1.1
Share repurchases	(1.6)	0
Borrowings under credit arrangements	0.5	1.5
Repayments under credit arrangements	(0.5)	0
Payments on finance lease obligations	(0.5)	(0.6)
Change in bank overdrafts	0.4	0
Other financing activities	(0.7)	(1.3)
Net cash provided by financing activities from continuing operations	2.2	0.7
Effect of currency exchange rate changes on cash and cash equivalents	(5.1)	(4)
(Decrease) increase in cash and cash equivalents	(1.2)	148.4
Cash and cash equivalents, beginning of period	482.7	325
Cash and cash equivalents, end of period	481.5	473.4
Supplemental disclosure of non-cash investing activities:
Property and equipment purchases unpaid and included in accounts payable	5.2	4.9
Operating lease right of use assets obtained in exchange for new lease obligations	$ 19.5	$ 12.9

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies	9 Months Ended
	Sep. 30, 2021
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 Applied Technologies Inc. (“GCP”, or the “Company”) 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 provides products, services and technologies to the concrete and cement industries, including concrete addmixtures and cement, as well as in-transit monitoring and management systems, which reduce the cost and improve the performance and quality of cement, concrete, mortar, masonry, and other cementitious-based construction materials. 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. Basis of Presentation The accompanying unaudited Condensed 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 (“U.S. GAAP”) and with the instructions to Form 10-Q and Article 10 of Securities and Exchange Commission (“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, 2020 (the “2020 Annual Report on Form 10-K”). The Condensed Consolidated Balance Sheet at December 31, 2020 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, 2021 are not necessarily indicative of the results of operations for the year ending December 31, 2021. 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. Revisions of Previously Issued Condensed Consolidated Financial Statements In connection with the preparation of the consolidated financial statements for the year ended December 31, 2020, the Company identified an error in the freight expense accrual and other errors in its previously filed unaudited quarterly condensed consolidated financial statements for the first three quarterly periods of 2020. The Company considered the guidance in ASC Topic 250, Accounting Changes and Error Corrections (“ASC 250”), ASC Topic 250-10-S99-1, Assessing Materiality , and ASC Topic 250-10-S99-2, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements , (“ASC 250-10-S99-2”) in evaluating whether the Company’s previously issued unaudited condensed consolidated financial statements were materially misstated. The Company concluded the errors were not material individually or in the aggregate to the previously issued condensed consolidated financial statements. In accordance with ASC 250-10-S99-2, the Company has corrected these errors by revising previously filed unaudited quarterly condensed consolidated financial statements for the three and nine months ended September 30, 2020 in connection with the filing of this Form 10-Q. The accompanying footnotes have been corrected to reflect the impact of the revisions of the previously filed unaudited quarterly condensed consolidated financial statements for the three and nine months ended September 30, 2020. Please refer to Note 15, “Revisions of Previously Issued Condensed Consolidated Financial Statements” for reconciliations between as previously reported and as revised quarterly amounts, respectively. Use of Estimates The preparation of financial statements in conformity with U.S. 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 condensed 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 2020 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. GCP has been closely monitoring the impact of COVID-19 and working to manage the effects on its business globally. Despite progress in vaccination efforts, it is difficult to estimate with reasonable certainty at this time the duration and extent of the impact of this pandemic on 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 resurgence of the COVID-19 pandemic, as well as additional and unanticipated actions by government authorities to further contain its spread which may result in extended ongoing business disruptions. 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 6, “Income Taxes,” for details regarding estimates used in accounting for income tax matters, including unrecognized tax benefits. Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board (“FASB”) issued ASU 2019-12, Income Taxes , Simplifying the Accounting for Income Taxes . This guidance removes certain exceptions to the general principles of ASC 740, and clarifies and amends the existing guidance to improve consistent application. GCP adopted this guidance on January 1, 2021. The adoption did not have a material impact on its results of operations, financial position and cash flows. Discontinued Operations In July 2017, GCP completed the sale of its Darex Packaging Technologies (“Darex”) business to Henkel AG & Co. KGaA (“Henkel”) for $1.06 billion in cash. The agreement with Henkel provided for a series of delayed closings in certain non-U.S. jurisdictions. Darex results of operations and cash flows have been reclassified and reflected as “discontinued operations” in the statements of operations and cash flows for all periods presented. Unless otherwise noted, the information throughout the Notes to the accompanying unaudited Condensed Consolidated Financial Statements pertains only to the continuing operations of GCP.

Revenue from Lessor Arrangement

Revenue from Lessor Arrangements and Contracts with Customers	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [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. 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. For such arrangements, the transfer of control takes place at a point in time when products are shipped or delivered to the customer. Revenue from these contracts with customers is therefore typically recognized upon shipment of the product or delivery at the customer’s site based on shipping terms. 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 Company recognizes lease and service revenue for these arrangements. Revenue generated from VERIFI ® sales arrangements represented less than 10% of the Company’s net sales during the three and nine months ended September 30, 2021 and 2020. During the three months ended September 30, 2021 and 2020, the Company recognized lease revenue of $10.1 million and $9.9 million , respectively, and service revenu e of $2.3 million and $2.1 million , respectively. During the nine months ended September 30, 2021 and 2020, the Company recognized lease revenue of $29.3 million and $28.4 million, respectively, and service revenue of $6.6 million and $5.4 million, respectively. Lease revenue consists of dispenser lease revenue of $6.4 million and $6.6 million during the three months ended September 30, 2021 and 2020, respectively, and $18.6 million and $19.6 million during the nine months ended September 30, 2021 and 2020, respectively, as well as an allocated portion of VERIFI® fixed fees and variable slump management fees. Service revenue consists of an allocated portion of VERIFI® fixed fees and variable slump management fees. Lease and service revenue is included within net sales in the accompanying unaudited Condensed Consolidated Statements of Operations. Revenue generated from Ductilcrete sales arrangements represented less than 10% of the Company’s net sales during the three and nine months ended September 30, 2021 and 2020. The Company has certain long-term arrangements, under which the Company has certain performance obligations that are satisfied over time, resulting in remaining obligations for which the work has not been performed or has been partially performed. At September 30, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations was $9.6 million, including the estimated transaction price to be earned as revenue over the remaining term of these contracts, which is generally 1 to 5 years. The Company’s contract assets and liabilities resulting from its contracts in the SCC or SBM operating segments were not material at September 30, 2021 and December 31, 2020. Additionally, the amounts recorded in the accompanying unaudited Condensed Consolidated Statements of Operations during the three and nine months ended September 30, 2021 and 2020 related to changes in the contract assets and liabilities were not material.

Restructuring and Repositioning

Restructuring and Repositioning Expenses	9 Months Ended
Restructuring and Repositioning Expenses	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Restructuring and Repositioning Expenses	Restructuring and Repositioning Expenses Repositioning expenses are primarily related to consulting, professional services, and other employee-related costs associated with the Company’s restructuring activities. Restructuring and repositioning activity was as follows. Severance Asset Impairment Other Costs Total (in millions) Balance at December 31, 2020 $ 17.9 $ — $ 0.4 $ 18.3 Additional accrual 10.3 5.3 7.0 22.6 Payments (16.9) — (4.8) (21.7) Other (0.1) (5.3) (1.6) (7.0) Balance at September 30, 2021 $ 11.2 $ — $ 1.0 $ 12.2 The following table summarize the charges incurred and planned in connection with restructuring and repositioning plans. Severance Asset impairment Other Costs Repositioning Total Costs (in millions) 2021 Plan: Estimated total costs $13-$15 $8-$9 $6 $5 $32-$35 Cumulative costs to date $11.1 $5.0 $2.2 $2.1 $20.4 2019 Phase 2 Plan: Estimated total costs $25-$29 $1 $— $6-$7 $32-$37 Cumulative Costs to date $25.9 $0.7 $— $7.4 $34.0 2019 Plan: Estimated total costs $1 $1 $—$1 $11 $13-$14 Cumulative Costs to date $0.9 $0.9 $0.2 $10.5 $12.5 2021 Restructuring and Repositioning Plan (the “2021 Plan”) In March 2021, the Board approved a business restructuring and repositioning plan related to the relocation of the Company’s corporate headquarters to the Atlanta, Georgia area, the closure of its Cambridge, Massachusetts campus, the build-out of new global research and development (“R&D”) locations near the Boston/Cambridge area, as well as the consolidation of other regional facilities and offices, including an organizational redesign, which is expected to lower costs. The program is expected to be completed by June 2022. In August 2021, the Company entered into leases for its corporate headquarters and global R&D in Alpharetta, Georgia and Wilmington, Massachusetts, respectively, and recorded a right-of-use asset and corresponding lease liability of $19.5 million. During the nine months ended September 30, 2021, the Company incurred $20.4 million of restructuring charges for the 2021 Plan recorded within Restructuring and Repositioning Expenses in the statement of operations. $11.1 million was mostly for severance, $5.0 million for asset impairment charges, $2.2 million for other associated costs and $2.1 million for repositioning expenses. 2019 Phase 2 Restructuring and Repositioning Plan (the “2019 Phase 2 Plan”) In July 2019, the Board approved a business restructuring and repositioning plan to 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 resulted in the net reduction of approximately 10% of the Company’s workforce. The program was substantially completed in March 2021. During the nine months ended September 30, 2021, the Company incurred $2.4 million of restructuring charges for the 2019 Phase 2 Plan recorded within Restructuring and Repositioning Expenses in the statement of operations. During the nine months ended September 30, 2020, the Company incurred $11.6 million of restructuring charges for the 2019 Phase 2 Plan recorded within Restructuring and Repositioning Expenses in the statement of operations. $9.4 million was mostly for severance, $1.9 million was for repositioning expense, and $0.3 million for asset impairment charges. 2019 Restructuring and Repositioning Plan (the “2019 Plan”) In February 2019, the Board of Directors approved the 2019 Plan which focused on GCP’s global supply chain strategy, including its manufacturing, purchasing, logistics, and warehousing operations. The plan also addressed GCP’s service delivery model, primarily in North America, to streamline the Company’s pursuit of combined admixture and VERIFI opportunities. The program was completed by December 31, 2020.

Debt

Debt	9 Months Ended
Debt	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt	Debt The following is a summary of obligations under senior notes and other borrowings at September 30, 2021 and December 31, 2020. September 30, December 31, (In millions) Revolving Credit Facility due 2023 $ — $ — 5.5% Senior Notes due in 2026 347.1 346.6 Other borrowings 4.5 5.1 Total debt 351.6 351.7 Less: current portion of long-term debt 2.7 2.8 Long-term debt $ 348.9 $ 348.9 Weighted average interest rates on total debt obligations 5.5 % 5.5 % Revolving Credit Facility The Company entered into a $350 million Revolving Credit Facility on April 2018 (the “Revolving Credit Facility”). At September 30, 2021 and December 31, 2020, there were no outstanding borrowings on the Revolving Credit Facility. There were $2.8 million in outstanding letters of credit which resulted in available credit of $347.2 million at September 30, 2021. 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 the Company’s consolidated financial statements included in the 2020 Annual Report in the Form 10-K. The Company was in compliance with all covenant terms at September 30, 2021. There are no events of default at September 30, 2021. 5.5% Senior Notes The Company issued the 5.5% Senior Notes in April 2018 with an aggregate principal amount of $350 million maturing on April 15, 2026 (the “ 5.5% Senior Notes ” ). 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, 2021. At September 30, 2021 , the 5.5% Senior Notes are reported net of unamortized discount of $2.9 million. Based on quotes from dealers where obtainable or the value of the most recent trade in the market (Level 2), the outstanding 5.5% Senior Notes has a fair value of $358.2 million at September 30, 2021 . The 5.5% Senior Notes contain certain customary affirmative and negative covenants and events of default, as described in the Company’s Consolidated Financial Statements included in the 2020 Annual Report in the Form 10-K. The Company was in compliance with all covenants and conditions under the Indenture at September 30, 2021. There are no events of default at September 30, 2021. Other Borrowings Other borrowings are comprised of various borrowings under lines of credits, primarily by non-U.S. subsidiaries as well as $2.5 million and $3.0 million of finance lease obligations at September 30, 2021 and December 31, 2020, respectively. Other borrowings have a fair value that approximate their carrying value. We have $40.3 million available under various non-U.S. credit facilities.

Derivative Instruments

Derivative Instruments	9 Months Ended
Derivative Instruments	Sep. 30, 2021
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. At September 30, 2021, 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 Condensed Consolidated balance sheets. Each contract has a notional amount of €10.0 million and matures annually through June 2025. During the nine months ended September 30, 2021, GCP settled one contract with a notional amount of €10.0 million upon its maturity in June 2021 and entered into a new contract with a notional amount of €10.0 maturing in June 2025. The forward contracts are designated and qualify as net investment hedges for which effectiveness is assessed based on the spot rate method. The following table summarizes the fair value of the Company’s derivative instruments designated as net investment hedges at September 30, 2021 and December 31, 2020. Fair Value Balance Sheet Location September 30, 2021 December 31, 2020 (In millions) Derivative assets Other current asset $ 0.5 $ — Derivative assets Other asset 0.7 — Derivative liabilities Other current liabilities — 0.4 Derivative liabilities Other liabilities 0.4 1.4 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. The effects of our foreign exchange forward contracts on the unaudited Condensed Consolidated Statement of Operations and Comprehensive Income (Loss), is recorded as follows. Three Months Ended Nine Months Ended September 30, 2021 September 30, 2020 September 30, 2021 September 30, 2020 (In millions) Gain recognized in the statements of operations and comprehensive income, net of tax $ (0.2) $ (0.2) $ (0.6) $ (0.8) Cumulative translation adjustments 0.6 (1.8) 1.5 (1.3) Income tax effect (0.2) 0.5 (0.5) 0.3

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense attributable to continuing operations during the three months ended September 30, 2021 and 2020 was $1.6 million and $31.0 million, respectively, representing effective tax rates of 17.0% and 23.6%, 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, 2021, was due to an income tax benefit on valuation allowance releases of $1.4 million, offset by income tax expense on non-deductible executive compensation and other expenses of $0.8 million, and foreign rate differential of $0.3 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, 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 of $1.6 million and the effect of tax rates in foreign jurisdictions of $1.5 million, tax expense of $1.0 million due to income tax rate change in the United Kingdom, partially offset by tax benefits of $5.2 million related to the carryback of losses at the higher 35% U.S. tax rate applicable in prior years. Income tax expense attributable to continuing operations during the nine months ended September 30, 2021 and 2020 was $9.6 million and $34.0 million, respectively, representing effective tax rates of 32.5% and 25.1%, 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, 2021, was due to income tax expense on the United Kingdom rate change of $2.9 million, income tax expense on non-deductible executive compensation and other expenses of $1.8 million, and foreign rate differential of $1.5 million, offset by income tax benefit on valuation allowance releases of $2.9 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, 2020, was due to state income tax expense from the sale of the Cambridge site of $5.1 million, tax expense due to non-deductible expenses of $1.7 million and the effect of tax rates in foreign jurisdictions of $1.5 million, tax expense of $1.0 million on valuation allowance charges, and tax expense of $1.0 million due to income tax rate change in the United Kingdom, partially offset by tax benefits of $5.5 million related to the carryback of losses at the higher 35% U.S. tax rate applicable in prior years. Repatriation 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. During the three months ended September 30, 2021 GCP recognized an income tax benefit of $1.4 million, consisting primarily of $1.1 million of valuation allowance releases on foreign tax credit carryforwards. During the three months ended September 30, 2020, GCP recognized $0.1 million of income tax expense on valuation allowance increases. During the nine months ended September 30, 2021 GCP recognized an income tax benefit of $2.9 million consisting primarily of $1.5 million of valuation allowance release on deferred tax assets in France, $1.1 million of valuation allowance release on foreign tax credit carryforwards and $0.2 million on deferred tax assets in Australia. During the nine months ended September 30, 2020, GCP recognized $1.0 million of income tax expense on valuation allowance increases for net operating losses primarily in Argentina and Australia. Tax Sharing Agreement In connection with the legal separation and transfer of W.R. Grace & Co.’s (“Grace”) construction products and packaging technologies businesses to the Company through a dividend distribution of all of the then-outstanding common stock of GCP to Grace shareholders on February 3, 2016 (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 12, “Related Party Transactions and Transactions with Grace” for further information on the Tax Sharing Agreement.

Pension and Postretirement Bene

Pension and Postretirement Benefit Plans	9 Months Ended
Pension and Postretirement Benefit Plans	Sep. 30, 2021
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Pension and Postretirement Benefit Plans	Pension and Postretirement Benefit Plans The components of GCP’s net periodic benefit cost for the three months ended September 30, 2021 and 2020 are as follows. Three Months Ended 2021 2020 U.S. Non-US U.S. Non-US (in millions) Service cost $ 1.7 $ 0.3 $ 1.5 $ 0.3 Interest cost 1.1 0.7 1.3 1.0 Expected return on plan assets (1.5) (0.8) (1.6) (1.2) Net periodic benefit cost $ 1.3 $ 0.2 $ 1.2 $ 0.1 The components of GCP’s net periodic benefit cost for the nine months ended September 30, 2021 and 2020 are as follows. Nine Months Ended 2021 2020 U.S. Non-US U.S. Non-US (in millions) Service cost $ 4.8 $ 0.8 $ 4.6 $ 0.7 Interest cost 3.5 2.1 3.8 3.1 Expected return on plan assets (4.6) (2.3) (4.9) (3.5) Amortization of prior service cost — 0.1 — 0.1 Net periodic benefit cost $ 3.7 $ 0.7 $ 3.5 $ 0.4 Service cost component of net periodic benefit cost is included in selling, general and administrative expenses and cost of goods sold in the statements of operations. All other components of net periodic benefit costs are presented in Other expense, net within the Condensed Consolidated Statements of Operations.

Other Balance Sheet Information

Other Balance Sheet Information	9 Months Ended
Other Balance Sheet Information	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Balance Sheet Information	Other Balance Sheet Information The following is a summary of inventories. September 30, December 31, (in millions) Raw materials $ 58.5 $ 41.3 In process 5.4 4.2 Finished products and other 66.1 52.9 Total inventories $ 130.0 $ 98.4 The following is a summary of other current assets. September 30, December 31, (in millions) Non-trade receivables $ 21.3 $ 20.4 Prepaid expenses and other current assets 17.3 11.1 Income taxes receivable 11.8 9.7 Total other current assets $ 50.4 $ 41.2 The following is a summary of other assets. September 30, December 31, (in millions) Operating lease right-of-use asset $ 51.8 $ 40.0 Defined benefit pension plans 29.6 29.7 Deferred income taxes 9.6 9.6 Other assets 30.7 35.1 Total other assets $ 121.7 $ 114.4 The following is a summary of other current liabilities. September 30, December 31, (in millions) Accrued customer volume rebates $ 21.6 $ 24.4 Accrued compensation 21.2 25.0 Restructuring liability 12.2 18.3 Accrued interest 8.8 4.0 Operating lease obligations 8.0 8.0 Income taxes payable 5.5 7.1 Pension liabilities 1.3 1.4 Other accrued liabilities 47.8 45.6 Total other current liabilities $ 126.4 $ 133.8 The following is a summary of other liabilities. September 30, December 31, (in millions) Operating lease obligations $ 42.4 $ 26.2 Deferred income taxes 16.3 14.9 Other liabilities 15.6 16.8 Total other liabilities $ 74.3 $ 57.9

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2021
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. Lawsuits and Investigations Henkel AG & Co. KGaA Matters In July 2017, GCP completed the sale of its Darex business to Henkel. The Stock and Asset Purchase Agreement with Henkel regarding the sale of the Darex Business dated July 2017, (the “Purchase Agreement”) contains obligations for the Company as sellers to indemnify Henkel as buyer for certain matters, such as breaches of representations and warranties, taxes, as well as certain covenants and liabilities. In March 2021, Henkel filed suit in the United States District Court for the District of Delaware against the Company, seeking indemnification for alleged breaches of representations and warranties under the Purchase Agreement. Henkel is seeking damages of approximately $11 million, which consist of a claim amount of approximately $16 million, net of a contractual deductible of approximately $5 million. The Company believes that it has meritorious defenses against the plaintiff’s claims and intends to defend this action vigorously. Although the Company does not believe that resolution of this matter will have a material adverse effect on its business or financial condition, at this time, based on available information regarding this litigation, the Company is unable to reasonably assess the ultimate outcome of this case or determine an estimate, or a range of estimates, of potential losses, if any, that might result from an adverse resolution of this matter. Fees incurred by the Company in relation to the defense of these claims are classified as discontinued operations in the accompanying unaudited Condensed Consolidated Statements of Operations. Other Matters 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, except as disclosed above, 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, 2021. However, the results of such pending legal matters and claims cannot be predicted with sufficient certainty since unfavorable resolutions are possible and could materially affect GCP’s financial position, results of operations, or cash flows. In the event of unexpected subsequent developments and due to the inherent unpredictability of these matters, there can be no assurance that the Company’s assessment of any claim will reflect the ultimate outcome. An adverse outcome in certain matters could, from time to time, have a material adverse effect on GCP’s condensed consolidated financial position, results of operations and cash flows in particular quarterly or annual periods. Financial Assurances Financial assurances have been established for a variety of purposes, including insurance, environmental matters and other matters. At September 30, 2021 and December 31, 2020, GCP had gross financial assurances issued and outstanding of $6.3 million and $6.8 million, respectively, which were composed of standby letters of credit. The letters of credit are related primarily to customer advances and other performance obligations. 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. Brazil Indirect Tax Claim

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
Accumulated Other Comprehensive Loss	Sep. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Accumulated other comprehensive income, net of tax, is presented below. Currency Translation Adjustments Pension Plans Hedging Activities Accumulated other Comprehensive Loss (in millions) Balance at June 30, 2021 $ (110.5) $ (3.0) $ — $ (113.5) Net current-period other comprehensive (loss) income (12.6) — 0.1 (12.5) Balance at September 30, 2021 $ (123.1) $ (3.0) $ 0.1 $ (126.0)

Stock Incentive Plans

Stock Incentive Plans	9 Months Ended
Stock Incentive Plans	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock Incentive Plans	Stock Incentive Plans Stock-Based Compensation Accounting GCP grants restricted stock units (“RSUs”), stock options and performance-based units (“PBUs”) with or without market conditions which vest upon the satisfaction of a performance condition and/or a service condition. During the three and nine months ended September 30, 2021, stock-based compensation expense was $1.8 million and $5.3 million, respectively, and during the three and nine months ended September 30, 2020 it was $3.3 million and $5.6 million, respectively. During the three and nine months ended September 30, 2021, $0.1 million and $1.1 million, respectively, of the stock-based compensation expense is included in Restructuring and Repositioning Expenses in the statement of operations. During the three and nine months ended September 30, 2020, $1.8 million of the stock-based compensation expense is included in Restructuring and Repositioning Expenses in the statement of operations. The Company issues new shares of common stock upon exercise of stock options and vesting of RSUs and PBUs. 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, 2021 and 2020, GCP withheld and retained approximately 65,200 shares and 62,200 shares, respectively, in a non-cash transaction with a cost of $1.6 million and $1.4 million, respectively. At September 30, 2021, total unrecognized compensation expense of $1.5 million was related to stock options with market conditions and $6.1 million related to the RSU and PBU awards. Such expense is expected to be recognized over the remaining weighted-average service period of approximately 2.0 years for stock options with market conditions and approximately 1.5 years for RSU and PBU awards. Stock Options Approximately 269,000 options were exercised during the nine months ended September 30, 2021 with a weighted average exercise price of $17.16. Total intrinsic value of these options was approximately $2.3 million. Restricted Stock Units The following table sets forth the RSU activity for the nine months ended September 30, 2021: RSU Activity Number Of Weighted Outstanding, December 31, 2020 305 $ 22.14 RSUs granted 129 25.81 Less: RSUs settled (182) 22.54 Less: RSUs forfeited (18) 23.99 RSUs outstanding, September 30, 2021 234 $ 23.74 Expected to vest as of September 30, 2021 231 $ 23.72 The weighted average grant date fair value of RSUs granted during the nine months ended September 30, 2021 and 2020 was $25.81 and $21.13. During the nine months ended September 30, 2021 and 2020, GCP distributed 182,000 shares and 151,000 shares, respectively, to settle RSUs upon vesting. The fair value of RSUs vested during the nine months ended September 30, 2021 and 2020 was $4.6 million and $3.4 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 2021 includes the following metrics: (i) a 2-year cumulative free cash flow target metric for approximately 33.3% of awards; (ii) a 2 -year cumulative adjusted earnings before interest, tax, depreciation and amortization metric for approximately 33.3% of awards; (iii) the Company’s 2-year total shareholder return (“TSR”) relative to the performance of the Russell 3000 Specialty Building Materials Index and the peer group approved by the Board’s Compensation Committee for approximately 33.3% of awards. 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 awards will become vested, if at all, 2 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 grant date fair value of PBUs without market conditions is determined based on the closing market price of the Company’s common stock on the date of grant. The grant date fair value of PBUs with market conditions based on TSR is determined using a Monte Carlo simulation model. 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, 2021 and 2020. Nine Months Ended September 30, Assumptions used to calculate expense for PBUs: 2021 2020 Expected Term (Remaining Performance Period) 1.81 2.85 Expected volatility 51.48% 29.85% Risk-free interest rate 0.14% 1.21% Expected dividends — — Median correlation coefficient of constituents 54.00% 54.01% The following table sets forth the PBU activity for the nine months ended September 30, 2021. PBU Activity Number Of Weighted Outstanding, December 31, 2020 343 $ 28.10 PBU’s granted 97 27.17 Less: PBU’s forfeited (165) 30.80 Outstanding, September 30, 2021 275 $ 26.13

Related Party Transactions and

Related Party Transactions and Transactions with Grace	9 Months Ended
Related Party Transactions and Transactions with Grace	Sep. 30, 2021
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. Tax Sharing Agreement Per the Tax Sharing Agreement, 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. At September 30, 2021 and December 31, 2020, GCP has recorded $1.8 million of indemnified receivables in “Other assets” and $1.0 million of indemnified payables in “Other current liabilities” in the unaudited Condensed Consolidated Balance Sheets.

Earnings Per Share

Earnings Per Share	9 Months Ended
Earnings Per Share	Sep. 30, 2021
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, 2021 2020 2021 2020 (in millions, except per share amounts) Numerators Income from continuing operations attributable to GCP shareholders $ 7.8 $ 100.0 $ 19.7 $ 101.3 Loss from discontinued operations, net of income taxes (0.1) (0.1) (0.3) (0.4) Net income attributable to GCP shareholders $ 7.7 $ 99.9 $ 19.4 $ 100.9 Denominators Weighted average common shares—basic calculation 73.5 73.0 73.3 72.9 Dilutive effect of employee stock awards 0.1 0.2 0.2 0.2 Weighted average common shares—diluted calculation 73.6 73.2 73.5 73.1 Basic earnings per share: Income from continuing operations attributable to GCP shareholders $ 0.11 $ 1.37 $ 0.27 $ 1.39 Loss from discontinued operations, net of income taxes (0.01) — (0.01) (0.01) Net income attributable to GCP shareholders $ 0.10 $ 1.37 $ 0.26 $ 1.38 Diluted earnings (loss) per share: Income from continuing operations attributable to GCP shareholders $ 0.11 $ 1.36 $ 0.27 $ 1.39 Loss from discontinued operations, net of income taxes (0.01) — (0.01) (0.01) Net income attributable to GCP shareholders $ 0.10 $ 1.36 $ 0.26 $ 1.38 GCP uses the treasury stock method to compute diluted earnings (loss) per share. During the three and nine months ended September 30, 2021, 0.6 million and 0.5 million, respectively, of such anti-dilutive stock awards were excluded from the computation of diluted earnings per share. During the three and nine months ended September 30, 2020, 0.6 million and 0.6 million, respectively, of anti-dilutive stock awards were excluded from the computation of diluted earnings per share.

Operating Segment and Geographi

Operating Segment and Geographic Information	9 Months Ended
Operating Segment and Geographic Information	Sep. 30, 2021
Segment Reporting [Abstract]
Operating Segment and Geographic Information	Operating Segment and Geographic Information Operating Segment Data The following table presents information related to GCP’s operating segments. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in millions) Net Sales SCC $ 142.0 $ 138.3 $ 410.5 $ 379.6 SBM 107.6 110.1 315.3 280.9 Total net sales $ 249.6 $ 248.4 $ 725.8 $ 660.5 Segment Operating Income SCC $ 7.7 $ 18.8 $ 29.1 $ 37.7 SBM 20.9 25.6 60.2 51.3 Total Segment Operating Income $ 28.6 $ 44.4 $ 89.3 $ 89.0 Restructuring and Repositioning Expenses SCC $ 0.9 $ 0.6 $ 7.3 $ 3.2 SBM 2.2 0.2 6.3 1.1 Corporate 3.6 7.0 9.0 10.7 Total segment Restructuring and Repositioning Expenses $ 6.7 $ 7.8 $ 22.6 $ 15.0 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, 2021 and 2020 is reconciled below to Income from continuing operations before income taxes presented in the accompanying unaudited Condensed Consolidated Statements of Operations. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in millions) Total segment operating income $ 28.6 $ 44.4 $ 89.3 $ 89.0 Restructuring and repositioning expenses (6.7) (7.8) (22.6) (15.0) Interest expense, net (5.5) (5.3) (16.3) (15.1) Third-party and other acquisition-related costs (2.9) — (3.4) (0.7) Corporate costs (2.6) (7.1) (16.6) (19.7) Certain pension costs (1.5) (1.3) (4.4) (3.9) Shareholder activism and other related costs — (2.1) — (9.5) Gain on sale of corporate headquarters — 110.2 — 110.2 Net income attributable to noncontrolling interests — 0.2 0.2 0.4 Gain on Brazil tax recoveries — — 3.3 — Income from continuing operations before income taxes $ 9.4 $ 131.2 $ 29.5 $ 135.7 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. Shareholder activism and other related costs consist primarily of professional fees incurred in connection with the actions by certain GCP shareholders seeking changes in the composition of the Company’s Board of Directors and nomination of candidates to stand for election at the 2020 Annual Shareholders’ Meeting, as well as other related matters. 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 Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (in millions) Net Sales United States $ 127.8 $ 132.5 $ 363.8 $ 351.8 Canada and Other 8.8 8.7 23.0 20.9 Total North America 136.6 141.2 386.8 372.7 Europe Middle East Africa 50.2 47.4 148.9 126.3 Asia Pacific 45.0 47.4 144.3 127.4 Latin America 17.8 12.4 45.8 34.1 Total $ 249.6 $ 248.4 $ 725.8 $ 660.5 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, 2021 and 2020. There were no customers that individually accounted for 10% or more of the Company’s condensed consolidated net sales during the three and nine months ended September 30, 2021 and 2020. There were no customers that individually accounted for 10% or more of the Company’s accounts receivable balance at September 30, 2021 and December 31, 2020.

Revisions of Previously Issued

Revisions of Previously Issued Consolidated Financial Statements	9 Months Ended
	Sep. 30, 2021
Accounting Changes and Error Corrections [Abstract]
Revisions of Previously Issued Consolidated Financial Statements	Revisions of Previously Issued Consolidated Financial Statements As described in Note 1, “Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies,” the following tables set forth the impact of the revisions of the previously filed unaudited quarterly Consolidated Financial Statements at and for the three and nine months ended September 30, 2020. GCP Applied Technologies Inc. Condensed Consolidated Statements of Operations (unaudited) Three Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions, except per share amounts) Net sales $ 248.4 $ — $ 248.4 Cost of goods sold 147.0 (0.4) 146.6 Gross profit 101.4 0.4 101.8 Selling, general and administrative expenses 65.2 (0.5) 64.7 Interest expense and related financing costs 5.6 — 5.6 Restructuring and reposition expenses 7.8 — 7.8 Gain on sale of corporate headquarters (110.2) — (110.2) Other expense, net 2.7 — 2.7 Total costs and expenses (28.9) (0.5) (29.4) Income from continuing operations before income taxes 130.3 0.9 131.2 Provision for income taxes (30.6) (0.4) (31.0) Income from continuing operations 99.7 0.5 100.2 Income from discontinued operations, net of income taxes (0.1) — (0.1) Net income 99.6 0.5 100.1 Less: Net income attributable to non-controlling interests (0.2) — (0.2) Net income attributable to GCP shareholders $ 99.4 $ 0.5 $ 99.9 Amounts Attributable to GCP Shareholders: Net income from continuing operations attributable to GCP shareholders $ 99.5 $ 0.5 $ 100.0 Loss from discontinued operations, net of income taxes (0.1) — (0.1) Net income attributable to GCP shareholders $ 99.4 $ 0.5 $ 99.9 Comprehensive income attributable to GCP shareholders $ 110.2 $ 0.5 $ 110.7 Basic earnings per share: Net income from continuing operations attributable to GCP shareholders $ 1.36 $ 0.01 $ 1.37 Loss from discontinued operations, net of income taxes — — — Net income attributable to GCP shareholders $ 1.36 $ 0.01 1.37 Weighted average number of basic shares 73.0 73.0 Diluted earnings per share: Income from continuing operations attributable to GCP shareholders $ 1.36 $ — $ 1.36 Loss from discontinued operations, net of income taxes — — — Net income attributable to GCP shareholders $ 1.36 $ — $ 1.36 Weighted average number of diluted shares 73.2 — 73.2 Nine Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions, except per share amounts) Net sales $ 660.5 $ — $ 660.5 Cost of goods sold 400.8 (2.3) 398.5 Gross profit 259.7 2.3 262.0 Selling, general and administrative expenses 199.0 (0.2) 198.8 Interest expense and related financing costs 16.3 — 16.3 Restructuring and reposition expenses 15.0 — 15.0 Gain on sale of corporate headquarters (110.2) — (110.2) Other expense, net 6.4 — 6.4 Total costs and expenses 126.5 (0.2) 126.3 Income from continuing operations before income taxes 133.2 2.5 135.7 Provision for income taxes (33.2) (0.8) (34.0) Income from continuing operations 100.0 1.7 101.7 Loss from discontinued operations, net of income taxes (0.4) — (0.4) Net income 99.6 1.7 101.3 Less: Net loss attributable to non-controlling interests (0.4) — (0.4) Net income attributable to GCP shareholders $ 99.2 $ 1.7 $ 100.9 Amounts Attributable to GCP Shareholders: Income from continuing operations attributable to GCP shareholders $ 99.6 $ 1.7 $ 101.3 Loss from discontinued operations, net of income taxes (0.4) — (0.4) Net income attributable to GCP shareholders $ 99.2 $ 1.7 $ 100.9 Comprehensive income attributable to GCP shareholders $ 81.3 $ 1.7 $ 83.0 Basic earnings per share: Income from continuing operations attributable to GCP shareholders $ 1.37 $ 0.02 $ 1.39 Loss from discontinued operations, net of income taxes (0.01) — (0.01) Net income attributable to GCP shareholders $ 1.36 $ 0.02 $ 1.38 Weighted average number of basic shares 72.9 72.9 Diluted earnings per share: Income from continuing operations attributable to GCP shareholders $ 1.36 $ 0.03 $ 1.39 Loss from discontinued operations, net of income taxes — (0.01) (0.01) Net income attributable to GCP shareholders $ 1.36 $ 0.02 $ 1.38 Weighted average number of diluted shares 73.1 73.1 GCP Applied Technologies Inc. Condensed Consolidated Statements of Stockholders’ Equity (unaudited) Three Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions) Balance, June 30, 2020 $ 515.2 $ 1.2 516.4 Net income 99.6 0.5 100.1 Share-based compensation 3.1 — 3.1 Exercise of stock options 0.4 — 0.4 Share repurchases (1.1) — (1.1) Dividends and other changes in non-controlling interest (0.1) — (0.1) Other comprehensive loss 10.8 — 10.8 Balance, September 30, 2020 $ 627.9 $ 1.7 $ 629.6 Nine Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions) Balance, December 31, 2019 $ 541.1 $ — $ 541.1 Net income 99.6 1.7 101.3 Share-based compensation 5.9 — 5.9 Exercise of stock options 1.1 — 1.1 Share repurchases (1.4) — (1.4) Dividends and other changes in non-controlling interest (0.5) — (0.5) Other comprehensive loss (17.9) — (17.9) Balance, September 30, 2020 $ 627.9 $ 1.7 $ 629.6 GCP Applied Technologies Inc. Condensed Consolidated Statements of Cash Flows (unaudited) Nine Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions) OPERATING ACTIVITIES Net income $ 99.6 $ 1.7 $ 101.3 Less: Loss from discontinued operations (0.4) — (0.4) Income from continuing operations 100.0 1.7 101.7 Reconciliation to net cash provided by operating activities: Loss on disposal of property and equipment (109.7) — (109.7) Depreciation and amortization 34.5 — 34.5 Deferred income taxes 21.1 0.8 21.9 Stock-based compensation expense 3.8 — 3.8 Unrealized loss on foreign currency 2.7 — 2.7 Amortization of debt discount and financing costs 1.1 — 1.1 Changes in assets and liabilities, excluding effect of currency translation: Trade accounts receivable 8.6 — 8.6 Inventories 3.2 — 3.2 Accounts payable (3.9) — (3.9) Pension assets and liabilities, net (12.4) — (12.4) Other assets and liabilities, net 10.3 (2.5) 7.8 Net cash provided by operating activities from continuing operations 59.3 — 59.3 Net cash used in operating activities from discontinued operations (2.5) — (2.5) Net cash provided by operating activities 56.8 — 56.8 INVESTING ACTIVITIES Capital expenditures (28.0) — (28.0) Proceeds from sale of corporate headquarters, net of transaction costs 122.5 — 122.5 Other 0.4 — 0.4 Net cash provided by investing activities from continuing operations 94.9 — 94.9 FINANCING ACTIVITIES Borrowings under credit arrangements 1.5 — 1.5 Proceeds from exercise of stock options 1.1 — 1.1 Payments on finance lease obligations (0.6) — (0.6) Other (1.3) — (1.3) Net cash used in financing activities from continuing operations 0.7 — 0.7 Effect of currency exchange rate changes on cash and cash equivalents (4.0) — (4.0) Decrease in cash and cash equivalents 148.4 — 148.4 Cash and cash equivalents, beginning of period 325.0 — 325.0 Cash and cash equivalents, end of period $ 473.4 $ — $ 473.4

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed 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 (“U.S. GAAP”) and with the instructions to Form 10-Q and Article 10 of Securities and Exchange Commission (“SEC”) Regulation S-X for interim financial information.
Revisions of Previously Issued Consolidated Financial Statements	Revisions of Previously Issued Condensed Consolidated Financial Statements In connection with the preparation of the consolidated financial statements for the year ended December 31, 2020, the Company identified an error in the freight expense accrual and other errors in its previously filed unaudited quarterly condensed consolidated financial statements for the first three quarterly periods of 2020. The Company considered the guidance in ASC Topic 250, Accounting Changes and Error Corrections (“ASC 250”), ASC Topic 250-10-S99-1, Assessing Materiality , and ASC Topic 250-10-S99-2, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements , (“ASC 250-10-S99-2”) in evaluating whether the Company’s previously issued unaudited condensed consolidated financial statements were materially misstated. The Company concluded the errors were not material individually or in the aggregate to the previously issued condensed consolidated financial statements. In accordance with ASC 250-10-S99-2, the Company has corrected these errors by revising previously filed unaudited quarterly condensed consolidated financial statements for the three and nine months ended September 30, 2020 in connection with the filing of this Form 10-Q. The accompanying footnotes have been corrected to reflect the impact of the revisions of the previously filed unaudited quarterly condensed consolidated financial statements for the three and nine months ended September 30, 2020. Please refer to Note 15, “Revisions of Previously Issued Condensed Consolidated Financial Statements” for reconciliations between as previously reported and as revised quarterly amounts, respectively.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. 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 condensed 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 2020 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. GCP has been closely monitoring the impact of COVID-19 and working to manage the effects on its business globally. Despite progress in vaccination efforts, it is difficult to estimate with reasonable certainty at this time the duration and extent of the impact of this pandemic on 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 resurgence of the COVID-19 pandemic, as well as additional and unanticipated actions by government authorities to further contain its spread which may result in extended ongoing business disruptions.
Income Tax	Income Tax
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board (“FASB”) issued ASU 2019-12, Income Taxes , Simplifying the Accounting for Income Taxes . This guidance removes certain exceptions to the general principles of ASC 740, and clarifies and amends the existing guidance to improve consistent application. GCP adopted this guidance on January 1, 2021. The adoption did not have a material impact on its results of operations, financial position and cash flows.

Restructuring and Repositioni_2

Restructuring and Repositioning Expenses (Tables)	9 Months Ended
Restructuring and Repositioning Expenses (Tables)	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Expenses	Restructuring and repositioning activity was as follows. Severance Asset Impairment Other Costs Total (in millions) Balance at December 31, 2020 $ 17.9 $ — $ 0.4 $ 18.3 Additional accrual 10.3 5.3 7.0 22.6 Payments (16.9) — (4.8) (21.7) Other (0.1) (5.3) (1.6) (7.0) Balance at September 30, 2021 $ 11.2 $ — $ 1.0 $ 12.2
Schedule of Restructuring Liability	The following table summarize the charges incurred and planned in connection with restructuring and repositioning plans. Severance Asset impairment Other Costs Repositioning Total Costs (in millions) 2021 Plan: Estimated total costs $13-$15 $8-$9 $6 $5 $32-$35 Cumulative costs to date $11.1 $5.0 $2.2 $2.1 $20.4 2019 Phase 2 Plan: Estimated total costs $25-$29 $1 $— $6-$7 $32-$37 Cumulative Costs to date $25.9 $0.7 $— $7.4 $34.0 2019 Plan: Estimated total costs $1 $1 $—$1 $11 $13-$14 Cumulative Costs to date $0.9 $0.9 $0.2 $10.5 $12.5

Debt (Tables)

Debt (Tables)	9 Months Ended
Debt (Tables)	Sep. 30, 2021
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, 2021 and December 31, 2020. September 30, December 31, (In millions) Revolving Credit Facility due 2023 $ — $ — 5.5% Senior Notes due in 2026 347.1 346.6 Other borrowings 4.5 5.1 Total debt 351.6 351.7 Less: current portion of long-term debt 2.7 2.8 Long-term debt $ 348.9 $ 348.9 Weighted average interest rates on total debt obligations 5.5 % 5.5 %

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
Derivative Instruments (Tables)	Sep. 30, 2021
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 at September 30, 2021 and December 31, 2020. Fair Value Balance Sheet Location September 30, 2021 December 31, 2020 (In millions) Derivative assets Other current asset $ 0.5 $ — Derivative assets Other asset 0.7 — Derivative liabilities Other current liabilities — 0.4 Derivative liabilities Other liabilities 0.4 1.4
Net Investment Hedges in Consolidated Statements of Operations and Comprehensive Loss	The effects of our foreign exchange forward contracts on the unaudited Condensed Consolidated Statement of Operations and Comprehensive Income (Loss), is recorded as follows. Three Months Ended Nine Months Ended September 30, 2021 September 30, 2020 September 30, 2021 September 30, 2020 (In millions) Gain recognized in the statements of operations and comprehensive income, net of tax $ (0.2) $ (0.2) $ (0.6) $ (0.8) Cumulative translation adjustments 0.6 (1.8) 1.5 (1.3) Income tax effect (0.2) 0.5 (0.5) 0.3

Pension and Postretirement Be_2

Pension and Postretirement Benefit Plans (Tables)	9 Months Ended
Pension and Postretirement Benefit Plans (Tables)	Sep. 30, 2021
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Components of Net Periodic Benefit Cost (Income)	The components of GCP’s net periodic benefit cost for the three months ended September 30, 2021 and 2020 are as follows. Three Months Ended 2021 2020 U.S. Non-US U.S. Non-US (in millions) Service cost $ 1.7 $ 0.3 $ 1.5 $ 0.3 Interest cost 1.1 0.7 1.3 1.0 Expected return on plan assets (1.5) (0.8) (1.6) (1.2) Net periodic benefit cost $ 1.3 $ 0.2 $ 1.2 $ 0.1 The components of GCP’s net periodic benefit cost for the nine months ended September 30, 2021 and 2020 are as follows. Nine Months Ended 2021 2020 U.S. Non-US U.S. Non-US (in millions) Service cost $ 4.8 $ 0.8 $ 4.6 $ 0.7 Interest cost 3.5 2.1 3.8 3.1 Expected return on plan assets (4.6) (2.3) (4.9) (3.5) Amortization of prior service cost — 0.1 — 0.1 Net periodic benefit cost $ 3.7 $ 0.7 $ 3.5 $ 0.4

Other Balance Sheet Informati_2

Other Balance Sheet Information (Tables)	9 Months Ended
Other Balance Sheet Information (Tables)	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Inventories	The following is a summary of inventories. September 30, December 31, (in millions) Raw materials $ 58.5 $ 41.3 In process 5.4 4.2 Finished products and other 66.1 52.9 Total inventories $ 130.0 $ 98.4
Schedule of Other Current Assets	The following is a summary of other current assets. September 30, December 31, (in millions) Non-trade receivables $ 21.3 $ 20.4 Prepaid expenses and other current assets 17.3 11.1 Income taxes receivable 11.8 9.7 Total other current assets $ 50.4 $ 41.2
Schedule of Other Assets, Noncurrent	The following is a summary of other assets. September 30, December 31, (in millions) Operating lease right-of-use asset $ 51.8 $ 40.0 Defined benefit pension plans 29.6 29.7 Deferred income taxes 9.6 9.6 Other assets 30.7 35.1 Total other assets $ 121.7 $ 114.4
Schedule of Other Current Liabilities	The following is a summary of other current liabilities. September 30, December 31, (in millions) Accrued customer volume rebates $ 21.6 $ 24.4 Accrued compensation 21.2 25.0 Restructuring liability 12.2 18.3 Accrued interest 8.8 4.0 Operating lease obligations 8.0 8.0 Income taxes payable 5.5 7.1 Pension liabilities 1.3 1.4 Other accrued liabilities 47.8 45.6 Total other current liabilities $ 126.4 $ 133.8
Other Noncurrent Liabilities	The following is a summary of other liabilities. September 30, December 31, (in millions) Operating lease obligations $ 42.4 $ 26.2 Deferred income taxes 16.3 14.9 Other liabilities 15.6 16.8 Total other liabilities $ 74.3 $ 57.9

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
Accumulated Other Comprehensive Loss (Tables)	Sep. 30, 2021
Equity [Abstract]
Schedule of Changes of Accumulated Other Comprehensive Loss, Net of Tax	Accumulated other comprehensive income, net of tax, is presented below. Currency Translation Adjustments Pension Plans Hedging Activities Accumulated other Comprehensive Loss (in millions) Balance at June 30, 2021 $ (110.5) $ (3.0) $ — $ (113.5) Net current-period other comprehensive (loss) income (12.6) — 0.1 (12.5) Balance at September 30, 2021 $ (123.1) $ (3.0) $ 0.1 $ (126.0) Currency Translation Adjustments Pension Plans Hedging Activities Accumulated other Comprehensive Loss (in millions) Balance at December 31, 2020 $ (107.4) $ (3.1) $ — $ (110.5) Net current-period other comprehensive (loss) income (15.7) 0.1 0.1 (15.5) Balance at September 30, 2021 $ (123.1) $ (3.0) $ 0.1 $ (126.0)

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	9 Months Ended
Stock Incentive Plans (Tables)	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Summary of Restricted Stock Units Award Activity	The following table sets forth the RSU activity for the nine months ended September 30, 2021: RSU Activity Number Of Weighted Outstanding, December 31, 2020 305 $ 22.14 RSUs granted 129 25.81 Less: RSUs settled (182) 22.54 Less: RSUs forfeited (18) 23.99 RSUs outstanding, September 30, 2021 234 $ 23.74 Expected to vest as of September 30, 2021 231 $ 23.72
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, 2021 and 2020. Nine Months Ended September 30, Assumptions used to calculate expense for PBUs: 2021 2020 Expected Term (Remaining Performance Period) 1.81 2.85 Expected volatility 51.48% 29.85% Risk-free interest rate 0.14% 1.21% Expected dividends — — Median correlation coefficient of constituents 54.00% 54.01%
Summary of Performance-Based Units Activity	The following table sets forth the PBU activity for the nine months ended September 30, 2021. PBU Activity Number Of Weighted Outstanding, December 31, 2020 343 $ 28.10 PBU’s granted 97 27.17 Less: PBU’s forfeited (165) 30.80 Outstanding, September 30, 2021 275 $ 26.13

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
Earnings Per Share (Tables)	Sep. 30, 2021
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, 2021 2020 2021 2020 (in millions, except per share amounts) Numerators Income from continuing operations attributable to GCP shareholders $ 7.8 $ 100.0 $ 19.7 $ 101.3 Loss from discontinued operations, net of income taxes (0.1) (0.1) (0.3) (0.4) Net income attributable to GCP shareholders $ 7.7 $ 99.9 $ 19.4 $ 100.9 Denominators Weighted average common shares—basic calculation 73.5 73.0 73.3 72.9 Dilutive effect of employee stock awards 0.1 0.2 0.2 0.2 Weighted average common shares—diluted calculation 73.6 73.2 73.5 73.1 Basic earnings per share: Income from continuing operations attributable to GCP shareholders $ 0.11 $ 1.37 $ 0.27 $ 1.39 Loss from discontinued operations, net of income taxes (0.01) — (0.01) (0.01) Net income attributable to GCP shareholders $ 0.10 $ 1.37 $ 0.26 $ 1.38 Diluted earnings (loss) per share: Income from continuing operations attributable to GCP shareholders $ 0.11 $ 1.36 $ 0.27 $ 1.39 Loss from discontinued operations, net of income taxes (0.01) — (0.01) (0.01) Net income attributable to GCP shareholders $ 0.10 $ 1.36 $ 0.26 $ 1.38

Operating Segment and Geograp_2

Operating Segment and Geographic Information (Tables)	9 Months Ended
Operating Segment and Geographic Information (Tables)	Sep. 30, 2021
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, 2021 2020 2021 2020 (in millions) Net Sales SCC $ 142.0 $ 138.3 $ 410.5 $ 379.6 SBM 107.6 110.1 315.3 280.9 Total net sales $ 249.6 $ 248.4 $ 725.8 $ 660.5 Segment Operating Income SCC $ 7.7 $ 18.8 $ 29.1 $ 37.7 SBM 20.9 25.6 60.2 51.3 Total Segment Operating Income $ 28.6 $ 44.4 $ 89.3 $ 89.0 Restructuring and Repositioning Expenses SCC $ 0.9 $ 0.6 $ 7.3 $ 3.2 SBM 2.2 0.2 6.3 1.1 Corporate 3.6 7.0 9.0 10.7 Total segment Restructuring and Repositioning Expenses $ 6.7 $ 7.8 $ 22.6 $ 15.0
Reconciliation of Operating Segment Data to Financial Statements	Total segment operating income for the three and nine months ended September 30, 2021 and 2020 is reconciled below to Income from continuing operations before income taxes presented in the accompanying unaudited Condensed Consolidated Statements of Operations. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (in millions) Total segment operating income $ 28.6 $ 44.4 $ 89.3 $ 89.0 Restructuring and repositioning expenses (6.7) (7.8) (22.6) (15.0) Interest expense, net (5.5) (5.3) (16.3) (15.1) Third-party and other acquisition-related costs (2.9) — (3.4) (0.7) Corporate costs (2.6) (7.1) (16.6) (19.7) Certain pension costs (1.5) (1.3) (4.4) (3.9) Shareholder activism and other related costs — (2.1) — (9.5) Gain on sale of corporate headquarters — 110.2 — 110.2 Net income attributable to noncontrolling interests — 0.2 0.2 0.4 Gain on Brazil tax recoveries — — 3.3 — Income from continuing operations before income taxes $ 9.4 $ 131.2 $ 29.5 $ 135.7
Net Sales by Geographic Area	The table below presents information related to the geographic areas in which GCP operates. Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020 (in millions) Net Sales United States $ 127.8 $ 132.5 $ 363.8 $ 351.8 Canada and Other 8.8 8.7 23.0 20.9 Total North America 136.6 141.2 386.8 372.7 Europe Middle East Africa 50.2 47.4 148.9 126.3 Asia Pacific 45.0 47.4 144.3 127.4 Latin America 17.8 12.4 45.8 34.1 Total $ 249.6 $ 248.4 $ 725.8 $ 660.5

Revisions of Previously Issue_2

Revisions of Previously Issued Consolidated Financial Statements (Tables)	9 Months Ended
	Sep. 30, 2021
Accounting Changes and Error Corrections [Abstract]
Schedule of Error Corrections and Prior Period Adjustments	GCP Applied Technologies Inc. Condensed Consolidated Statements of Operations (unaudited) Three Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions, except per share amounts) Net sales $ 248.4 $ — $ 248.4 Cost of goods sold 147.0 (0.4) 146.6 Gross profit 101.4 0.4 101.8 Selling, general and administrative expenses 65.2 (0.5) 64.7 Interest expense and related financing costs 5.6 — 5.6 Restructuring and reposition expenses 7.8 — 7.8 Gain on sale of corporate headquarters (110.2) — (110.2) Other expense, net 2.7 — 2.7 Total costs and expenses (28.9) (0.5) (29.4) Income from continuing operations before income taxes 130.3 0.9 131.2 Provision for income taxes (30.6) (0.4) (31.0) Income from continuing operations 99.7 0.5 100.2 Income from discontinued operations, net of income taxes (0.1) — (0.1) Net income 99.6 0.5 100.1 Less: Net income attributable to non-controlling interests (0.2) — (0.2) Net income attributable to GCP shareholders $ 99.4 $ 0.5 $ 99.9 Amounts Attributable to GCP Shareholders: Net income from continuing operations attributable to GCP shareholders $ 99.5 $ 0.5 $ 100.0 Loss from discontinued operations, net of income taxes (0.1) — (0.1) Net income attributable to GCP shareholders $ 99.4 $ 0.5 $ 99.9 Comprehensive income attributable to GCP shareholders $ 110.2 $ 0.5 $ 110.7 Basic earnings per share: Net income from continuing operations attributable to GCP shareholders $ 1.36 $ 0.01 $ 1.37 Loss from discontinued operations, net of income taxes — — — Net income attributable to GCP shareholders $ 1.36 $ 0.01 1.37 Weighted average number of basic shares 73.0 73.0 Diluted earnings per share: Income from continuing operations attributable to GCP shareholders $ 1.36 $ — $ 1.36 Loss from discontinued operations, net of income taxes — — — Net income attributable to GCP shareholders $ 1.36 $ — $ 1.36 Weighted average number of diluted shares 73.2 — 73.2 Nine Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions, except per share amounts) Net sales $ 660.5 $ — $ 660.5 Cost of goods sold 400.8 (2.3) 398.5 Gross profit 259.7 2.3 262.0 Selling, general and administrative expenses 199.0 (0.2) 198.8 Interest expense and related financing costs 16.3 — 16.3 Restructuring and reposition expenses 15.0 — 15.0 Gain on sale of corporate headquarters (110.2) — (110.2) Other expense, net 6.4 — 6.4 Total costs and expenses 126.5 (0.2) 126.3 Income from continuing operations before income taxes 133.2 2.5 135.7 Provision for income taxes (33.2) (0.8) (34.0) Income from continuing operations 100.0 1.7 101.7 Loss from discontinued operations, net of income taxes (0.4) — (0.4) Net income 99.6 1.7 101.3 Less: Net loss attributable to non-controlling interests (0.4) — (0.4) Net income attributable to GCP shareholders $ 99.2 $ 1.7 $ 100.9 Amounts Attributable to GCP Shareholders: Income from continuing operations attributable to GCP shareholders $ 99.6 $ 1.7 $ 101.3 Loss from discontinued operations, net of income taxes (0.4) — (0.4) Net income attributable to GCP shareholders $ 99.2 $ 1.7 $ 100.9 Comprehensive income attributable to GCP shareholders $ 81.3 $ 1.7 $ 83.0 Basic earnings per share: Income from continuing operations attributable to GCP shareholders $ 1.37 $ 0.02 $ 1.39 Loss from discontinued operations, net of income taxes (0.01) — (0.01) Net income attributable to GCP shareholders $ 1.36 $ 0.02 $ 1.38 Weighted average number of basic shares 72.9 72.9 Diluted earnings per share: Income from continuing operations attributable to GCP shareholders $ 1.36 $ 0.03 $ 1.39 Loss from discontinued operations, net of income taxes — (0.01) (0.01) Net income attributable to GCP shareholders $ 1.36 $ 0.02 $ 1.38 Weighted average number of diluted shares 73.1 73.1 GCP Applied Technologies Inc. Condensed Consolidated Statements of Stockholders’ Equity (unaudited) Three Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions) Balance, June 30, 2020 $ 515.2 $ 1.2 516.4 Net income 99.6 0.5 100.1 Share-based compensation 3.1 — 3.1 Exercise of stock options 0.4 — 0.4 Share repurchases (1.1) — (1.1) Dividends and other changes in non-controlling interest (0.1) — (0.1) Other comprehensive loss 10.8 — 10.8 Balance, September 30, 2020 $ 627.9 $ 1.7 $ 629.6 Nine Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions) Balance, December 31, 2019 $ 541.1 $ — $ 541.1 Net income 99.6 1.7 101.3 Share-based compensation 5.9 — 5.9 Exercise of stock options 1.1 — 1.1 Share repurchases (1.4) — (1.4) Dividends and other changes in non-controlling interest (0.5) — (0.5) Other comprehensive loss (17.9) — (17.9) Balance, September 30, 2020 $ 627.9 $ 1.7 $ 629.6 GCP Applied Technologies Inc. Condensed Consolidated Statements of Cash Flows (unaudited) Nine Months Ended September 30, 2020 Previously Reported Adjustments As Revised (in millions) OPERATING ACTIVITIES Net income $ 99.6 $ 1.7 $ 101.3 Less: Loss from discontinued operations (0.4) — (0.4) Income from continuing operations 100.0 1.7 101.7 Reconciliation to net cash provided by operating activities: Loss on disposal of property and equipment (109.7) — (109.7) Depreciation and amortization 34.5 — 34.5 Deferred income taxes 21.1 0.8 21.9 Stock-based compensation expense 3.8 — 3.8 Unrealized loss on foreign currency 2.7 — 2.7 Amortization of debt discount and financing costs 1.1 — 1.1 Changes in assets and liabilities, excluding effect of currency translation: Trade accounts receivable 8.6 — 8.6 Inventories 3.2 — 3.2 Accounts payable (3.9) — (3.9) Pension assets and liabilities, net (12.4) — (12.4) Other assets and liabilities, net 10.3 (2.5) 7.8 Net cash provided by operating activities from continuing operations 59.3 — 59.3 Net cash used in operating activities from discontinued operations (2.5) — (2.5) Net cash provided by operating activities 56.8 — 56.8 INVESTING ACTIVITIES Capital expenditures (28.0) — (28.0) Proceeds from sale of corporate headquarters, net of transaction costs 122.5 — 122.5 Other 0.4 — 0.4 Net cash provided by investing activities from continuing operations 94.9 — 94.9 FINANCING ACTIVITIES Borrowings under credit arrangements 1.5 — 1.5 Proceeds from exercise of stock options 1.1 — 1.1 Payments on finance lease obligations (0.6) — (0.6) Other (1.3) — (1.3) Net cash used in financing activities from continuing operations 0.7 — 0.7 Effect of currency exchange rate changes on cash and cash equivalents (4.0) — (4.0) Decrease in cash and cash equivalents 148.4 — 148.4 Cash and cash equivalents, beginning of period 325.0 — 325.0 Cash and cash equivalents, end of period $ 473.4 $ — $ 473.4

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021segment	Jul. 31, 2017USD ($)
Class of Stock [Line Items]
Number of operating segments \| segment	2
Disposed of by Sale \| Darex
Class of Stock [Line Items]
Consideration received \| $		$ 1,060

Revenue from Lessor Arrangeme_2

Revenue from Lessor Arrangements and Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net sales	$ 249.6	$ 248.4	$ 725.8	$ 660.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation	$ 9.6		$ 9.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 \| Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction	1 year		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 \| Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction	5 years		5 years
VERIFI Sales Arrangements
Accounts, Notes, Loans and Financing Receivable [Line Items]
Operating lease income	$ 10.1	9.9	$ 29.3	28.4
Service revenue	2.3	2.1	6.6	5.4
Net sales	$ 6.4	$ 6.6	$ 18.6	$ 19.6

Restructuring and Repositioni_3

Restructuring and Repositioning Expenses - Restructuring Liability Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Beginning balance			$ 18.3
Additional accrual	$ 6.7	$ 7.8	22.6	$ 15
Payments			(21.7)
Other			(7)
Ending balance	12.2		12.2
Severance
Restructuring Reserve [Roll Forward]
Beginning balance			17.9
Additional accrual			10.3
Payments			(16.9)
Other			(0.1)
Ending balance	11.2		11.2
Asset Impairment
Restructuring Reserve [Roll Forward]
Beginning balance			0
Additional accrual			5.3
Payments			0
Other			(5.3)
Ending balance	0		0
Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance			0.4
Additional accrual			7
Payments			(4.8)
Other			(1.6)
Ending balance	$ 1		$ 1

Restructuring and Repositioni_4

Restructuring and Repositioning Expenses (Details) $ in Millions	Sep. 30, 2021USD ($)
Restructuring Plan and Repositioning Plan 2021
Restructuring Cost and Reserve [Line Items]
Cost to date	$ 20.4
Restructuring Plan and Repositioning Plan 2021 \| Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	32
Restructuring Plan and Repositioning Plan 2021 \| Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	35
Restructuring Plan and Repositioning Plan Phase 2 2019
Restructuring Cost and Reserve [Line Items]
Cost to date	34
Restructuring Plan and Repositioning Plan Phase 2 2019 \| Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	32
Restructuring Plan and Repositioning Plan Phase 2 2019 \| Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	37
Restructuring Plan and Repositioning Plan 2019
Restructuring Cost and Reserve [Line Items]
Cost to date	12.5
Restructuring Plan and Repositioning Plan 2019 \| Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	13
Restructuring Plan and Repositioning Plan 2019 \| Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	14
Severance \| Restructuring Plan and Repositioning Plan 2021
Restructuring Cost and Reserve [Line Items]
Cost to date	11.1
Severance \| Restructuring Plan and Repositioning Plan 2021 \| Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	13
Severance \| Restructuring Plan and Repositioning Plan 2021 \| Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	15
Severance \| Restructuring Plan and Repositioning Plan Phase 2 2019
Restructuring Cost and Reserve [Line Items]
Cost to date	25.9
Severance \| Restructuring Plan and Repositioning Plan Phase 2 2019 \| Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	25
Severance \| Restructuring Plan and Repositioning Plan Phase 2 2019 \| Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	29
Severance \| Restructuring Plan and Repositioning Plan 2019
Restructuring Cost and Reserve [Line Items]
Estimated costs	1
Cost to date	0.9
Asset Impairment \| Restructuring Plan and Repositioning Plan 2021
Restructuring Cost and Reserve [Line Items]
Cost to date	5
Asset Impairment \| Restructuring Plan and Repositioning Plan 2021 \| Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	8
Asset Impairment \| Restructuring Plan and Repositioning Plan 2021 \| Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	9
Asset Impairment \| Restructuring Plan and Repositioning Plan Phase 2 2019
Restructuring Cost and Reserve [Line Items]
Estimated costs	1
Cost to date	0.7
Asset Impairment \| Restructuring Plan and Repositioning Plan 2019
Restructuring Cost and Reserve [Line Items]
Estimated costs	1
Cost to date	0.9
Other Costs \| Restructuring Plan and Repositioning Plan 2021
Restructuring Cost and Reserve [Line Items]
Estimated costs	6
Cost to date	2.2
Other Costs \| Restructuring Plan and Repositioning Plan Phase 2 2019
Restructuring Cost and Reserve [Line Items]
Estimated costs	0
Cost to date	0
Other Costs \| Restructuring Plan and Repositioning Plan 2019
Restructuring Cost and Reserve [Line Items]
Cost to date	0.2
Other Costs \| Restructuring Plan and Repositioning Plan 2019 \| Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	0
Other Costs \| Restructuring Plan and Repositioning Plan 2019 \| Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	1
Repositioning \| Restructuring Plan and Repositioning Plan 2021
Restructuring Cost and Reserve [Line Items]
Estimated costs	5
Cost to date	2.1
Repositioning \| Restructuring Plan and Repositioning Plan Phase 2 2019
Restructuring Cost and Reserve [Line Items]
Cost to date	7.4
Repositioning \| Restructuring Plan and Repositioning Plan Phase 2 2019 \| Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	6
Repositioning \| Restructuring Plan and Repositioning Plan Phase 2 2019 \| Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	7
Repositioning \| Restructuring Plan and Repositioning Plan 2019
Restructuring Cost and Reserve [Line Items]
Estimated costs	11
Cost to date	$ 10.5

Restructuring and Repositioni_5

Restructuring and Repositioning Expenses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Aug. 31, 2021	Dec. 31, 2020	Jul. 31, 2019
Restructuring Cost and Reserve [Line Items]
Operating lease right-of-use asset	$ 51.8		$ 51.8		$ 19.5	$ 40
Operating lease obligations					$ 19.5
Restructuring and repositioning expenses	6.7	$ 7.8	22.6	$ 15
Share-based payment arrangement, expense	1.8	3.3	5.3	5.6
Restructuring Plan and Repositioning Plan 2021
Restructuring Cost and Reserve [Line Items]
Restructuring and repositioning expenses			20.4
Severance costs			11.1
Asset impairment charges			5
Share-based payment arrangement, expense			2.2
Restructuring Plan and Repositioning Plan 2021 \| Repositioning
Restructuring Cost and Reserve [Line Items]
Other restructuring costs			2.1
Restructuring Plan and Repositioning Plan Phase 2 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and repositioning expenses				11.6
Severance costs				9.4
Asset impairment charges				0.3
Share-based payment arrangement, expense	$ 0.1	$ 1.8	1.1	1.8
Expected reduction in workforce, percent							10.00%
Restructuring Plan and Repositioning Plan Phase 2 2019 \| Repositioning
Restructuring Cost and Reserve [Line Items]
Other restructuring costs				1.9
Restructuring Plan and Repositioning Plan Phase 2 2019 \| Repositioning \| Restructuring and Repositioning Expenses
Restructuring Cost and Reserve [Line Items]
Other restructuring costs			$ 2.4
Restructuring Plan and Repositioning Plan 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and repositioning expenses				3.1
Severance costs				0.2
Asset impairment charges				0.9
Other restructuring costs				0.3
Restructuring Plan and Repositioning Plan 2019 \| Repositioning
Restructuring Cost and Reserve [Line Items]
Other restructuring costs				$ 1.7

Debt - Components of Debt (Deta

Debt - Components of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Apr. 30, 2018
Debt Instrument [Line Items]
Total debt	$ 351.6	$ 351.7
Less: current portion of long-term debt	2.7	2.8
Long-term debt	$ 348.9	$ 348.9
Weighted average interest rates on total debt obligations	5.50%	5.50%
Revolving Credit Facility due 2023 \| Revolving Credit Facility Due 2023
Debt Instrument [Line Items]
Total debt		$ 0	$ 0
Senior Notes \| 5.5% Senior notes due in 2026
Debt Instrument [Line Items]
Total debt	$ 347.1	346.6
Stated interest rate	5.50%			5.50%
Other borrowings
Debt Instrument [Line Items]
Total debt	$ 4.5	$ 5.1

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($)	Apr. 15, 2021	Sep. 30, 2021	Dec. 31, 2020	Apr. 30, 2018
Debt Instrument [Line Items]
Letters of credit outstanding		$ 2,800,000
Finance lease obligations		2,500,000	$ 3,000,000
Non-US
Debt Instrument [Line Items]
Remaining borrowing capacity		$ 40,300,000
Senior Notes \| 5.5% Senior notes due in 2026
Debt Instrument [Line Items]
Aggregate principal amount				$ 350,000,000
Stated interest rate		5.50%		5.50%
Interest payment	$ 9,600,000
Unamortized debt issuance cost		$ 2,900,000
Long-term debt, fair value		358,200,000
Revolving Credit Facility \| Revolving Credit Facility Due 2023
Debt Instrument [Line Items]
Aggregate principal amount		350,000,000
Outstanding borrowings		0	$ 0
Letter of Credit
Debt Instrument [Line Items]
Revolving credit facility		$ 347,200,000

Derivative Instruments - Narrat

Derivative Instruments - Narrative (Details) € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2021EUR (€)derivative_instrument	Sep. 30, 2021USD ($)derivative_instrument
Derivative [Line Items]
Number of derivative contracts settled \| derivative_instrument	1
Forward Contracts
Derivative [Line Items]
Number of derivative instruments \| derivative_instrument	4	4
Aggregate notional amount \| €	€ 40
Forward contract maturing 2021
Derivative [Line Items]
Aggregate notional amount		$ 10
Forward contract maturing 2022
Derivative [Line Items]
Aggregate notional amount		10
Forward contract maturing 2023
Derivative [Line Items]
Aggregate notional amount		10
Forward contract maturing 2024
Derivative [Line Items]
Aggregate notional amount		10
Forward contract maturing 2025
Derivative [Line Items]
Aggregate notional amount	€ 10	$ 10

Derivative Instruments - Net In

Derivative Instruments - Net Investment Hedges in Balance Sheets (Details) - Forward Contracts - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative assets, current	$ 0.5	$ 0
Derivative assets, noncurrent	0.7	0
Derivative liability, current	0	0.4
Derivative liability, noncurrent	$ 0.4	$ 1.4

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Cumulative translation adjustments	$ (12.4)	$ 10.3	$ (15.2)	$ (18.4)
Income tax effect	0.2	(0.5)	0.5	(0.3)
Forward Contracts
Derivative [Line Items]
Gain recognized in the statements of operations and comprehensive income, net of tax	(0.2)	(0.2)	(0.6)	(0.8)
Cumulative translation adjustments	0.6	(1.8)	1.5	(1.3)
Income tax effect	$ (0.2)	$ 0.5	$ (0.5)	$ 0.3

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ 1.6	$ 31	$ 9.6	$ 34
Effective tax rate	17.00%	23.60%	32.50%	25.10%
Nondeductible expense, executive compensation and other	$ 0.8	$ 1.6	$ 1.8	$ 1.7
Effect of tax rates in foreign jurisdictions	0.3	1.5	1.5	1.5
Valuation allowance expense (benefit)	(1.4)	0.1	(2.9)	1
State tax expense due to sale of cambridge site		5.1		5.1
Tax Cuts and Jobs Act, change in tax rate, income tax benefit		5.2		5.5
Valuation allowance releases on foreign tax credit carryforwards	$ 1.1		1.1
UNITED KINGDOM
Income Tax Contingency [Line Items]
Effect of tax rates in foreign jurisdictions			2.9	$ 1
Valuation allowance expense (benefit)		$ 1
FRANCE
Income Tax Contingency [Line Items]
Valuation allowance, DTA decease			1.5
AUSTRALIA
Income Tax Contingency [Line Items]
Valuation allowance, DTA decease			$ 0.2

Pension and Postretirement Be_3

Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.7	$ 1.5	$ 4.8	$ 4.6
Interest cost	1.1	1.3	3.5	3.8
Expected return on plan assets	(1.5)	(1.6)	(4.6)	(4.9)
Amortization of prior service cost			0	0
Net periodic benefit cost	1.3	1.2	3.7	3.5
Non-US
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.3	0.3	0.8	0.7
Interest cost	0.7	1	2.1	3.1
Expected return on plan assets	(0.8)	(1.2)	(2.3)	(3.5)
Amortization of prior service cost			0.1	0.1
Net periodic benefit cost	$ 0.2	$ 0.1	$ 0.7	$ 0.4

Other Balance Sheet Informati_3

Other Balance Sheet Information - Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 58.5	$ 41.3
In process	5.4	4.2
Finished products and other	66.1	52.9
Total inventories	$ 130	$ 98.4

Other Balance Sheet Informati_4

Other Balance Sheet Information - Other Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Non-trade receivables	$ 21.3	$ 20.4
Prepaid expenses and other current assets	17.3	11.1
Income taxes receivable	11.8	9.7
Total other current assets	$ 50.4	$ 41.2

Other Balance Sheet Informati_5

Other Balance Sheet Information - Other Assets, Noncurrent (Details) - USD ($) $ in Millions	Sep. 30, 2021	Aug. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating lease right-of-use asset	$ 51.8	$ 19.5	$ 40
Defined benefit pension plans	29.6		29.7
Deferred income taxes	9.6		9.6
Other assets	30.7		35.1
Other assets	$ 121.7		$ 114.4

Other Balance Sheet Informati_6

Other Balance Sheet Information - Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation	$ 21.2	$ 25
Accrued customer volume rebates	21.6	24.4
Restructuring liability	12.2	18.3
Operating lease obligations	8	8
Income taxes payable	5.5	7.1
Accrued interest	8.8	4
Pension liabilities	1.3	1.4
Other accrued liabilities	47.8	45.6
Total other current liabilities	$ 126.4	$ 133.8

Other Balance Sheet Informati_7

Other Balance Sheet Information - Other Noncurrent Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating lease obligations	$ 42.4	$ 26.2
Deferred income taxes	16.3	14.9
Other liabilities	15.6	16.8
Other liabilities	$ 74.3	$ 57.9

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	Mar. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Damages of approximately	$ 11
Claim amount of approximately	16
Net of contractual deductible	$ 5
Gain on brazil tax recoveries, net		$ 3.3
Amended Credit Agreement \| Standby Letter of Credit
Loss Contingencies [Line Items]
Gross financial assurances issued and outstanding			$ 6.3	$ 6.8

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance		$ 516.4	$ 654.1	$ 541.1
Net current-period other comprehensive (loss) income	$ (12.5)	10.8	(15.5)	(17.9)
Ending balance	666.7	$ 629.6	666.7	$ 629.6
Accumulated other Comprehensive Loss
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(113.5)		(110.5)
Ending balance	(126)		(126)
Currency Translation Adjustments
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(110.5)		(107.4)
Net current-period other comprehensive (loss) income	(12.6)		(15.7)
Ending balance	(123.1)		(123.1)
Pension Plans
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(3)		(3.1)
Net current-period other comprehensive (loss) income	0		0.1
Ending balance	(3)		(3)
Hedging Activities
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	0		0
Net current-period other comprehensive (loss) income	0.1		0.1
Ending balance	$ 0.1		$ 0.1

Stock Incentive Plans - Narrati

Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation (benefit) expense	$ 1.8	$ 3.3	$ 5.3	$ 5.6
Share repurchases (in shares)			65,200	62,200
Share repurchases			$ 1.6	$ 1.4
Fair value of awards vested			4.6	$ 3.4
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense related to the RSU and PBU awards	$ 1.5		$ 1.5
Unrecognized stock-based compensation expense for stock options, period of recognition			2 years
Exercise of stock options (in shares)			269,000
Weighted average exercise price (in usd per share)	$ 17.16		$ 17.16
Intrinsic value of all options exercised			$ 2.3
Restricted Stock Units (RSUs) and Performance Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense related to the RSU and PBU awards	$ 6.1		$ 6.1
Unrecognized stock-based compensation expense for stock options, period of recognition			1 year 6 months
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)			$ 25.81	$ 21.13
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, settlements in period			182,000	151,000
Performance Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in usd per share)			$ 27.17	$ 22.43
Award vesting period			2 years
Cumulative on cash flow target metric			33.30%
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%
Restructuring Plan and Repositioning Plan Phase 2 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation (benefit) expense	$ 0.1	$ 1.8	$ 1.1	$ 1.8

Stock Incentive Plans - Restric

Stock Incentive Plans - Restricted Stock Units Award Activity (Details) - Restricted Stock Units (RSUs) - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares)	305
Granted (in shares)	129
Settled (in shares)	(182)	(151)
Forfeited (in shares)	(18)
Outstanding, ending balance (in shares)	234
RSUs expected to vest (in shares)	231
Weighted Average Grant Date Fair Value
Outstanding, beginning balance (in usd per share)	$ 22.14
Granted (in usd per share)	25.81	$ 21.13
Settled (in usd per share)	22.54
Forfeited (in used per share)	23.99
Outstanding, ending balance (in usd per share)	23.74
RSUs expected to vest (in usd per share)	$ 23.72

Stock Incentive Plans - PBUs, V

Stock Incentive Plans - PBUs, Valuation Assumptions (Details) - Performance Based Units	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Term (Remaining Performance Period)	1 year 9 months 21 days	2 years 10 months 6 days
Expected volatility	51.48%	29.85%
Risk-free interest rate	14.00%	121.00%
Expected dividends	0.00%	0.00%
Median correlation coefficient of constituents	54.00%	54.01%

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, 2021	Sep. 30, 2020
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares)	343
Granted (in shares)	97
Forfeited (in shares)	(165)
Outstanding, ending balance (in shares)	275
Weighted Average Grant Date Fair Value
Outstanding, beginning balance (in usd per share)	$ 28.10
Granted (in usd per share)	27.17	$ 22.43
Forfeited (in used per share)	30.80
Outstanding, ending balance (in usd per share)	$ 26.13

Related Party Transactions an_2

Related Party Transactions and Transactions with Grace (Details) - W.R. Grace & Co. - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Due from related parties, noncurrent	$ 1.8	$ 1.8
Due to related parties, current	$ 1	$ 1

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerators
Net income from continuing operations attributable to GCP shareholders	$ 7.8	$ 100	$ 19.7	$ 101.3
Loss from discontinued operations, net of income taxes	(0.1)	(0.1)	(0.3)	(0.4)
Net income attributable to GCP shareholders	$ 7.7	$ 99.9	$ 19.4	$ 100.9
Denominators
Weighted average common shares—basic calculation (in shares)	73.5	73	73.3	72.9
Dilutive effect of employee stock awards (in shares)	0.1	0.2	0.2	0.2
Weighted average common shares—diluted calculation (in shares)	73.6	73.2	73.5	73.1
Basic earnings (loss) per share:
Income from continuing operations attributable to GCP shareholders (in usd per share)	$ 0.11	$ 1.37	$ 0.27	$ 1.39
Loss from discontinued operations, net of income taxes (in usd per share)	(0.01)	0	(0.01)	(0.01)
Net income attributable to GCP shareholders (in usd per share)	0.10	1.37	0.26	1.38
Diluted earnings (loss) per share
Income from continuing operations attributable to GCP shareholders (in usd per share)	0.11	1.36	0.27	1.39
Loss from discontinued operations, net of income taxes (in usd per share)	(0.01)	0	(0.01)	(0.01)
Net income attributable to GCP shareholders (in usd per share)	$ 0.10	$ 1.36	$ 0.26	$ 1.38
Antidilutive securities excluded from computation of earnings per share, treasury stock method (in shares)	0.6	0.6	0.5	0.6

Operating Segment and Geograp_3

Operating Segment and Geographic Information - Schedule of Operating Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 249.6	$ 248.4	$ 725.8	$ 660.5
Segment Operating Income	(75.1)	29.4	(234.6)	(126.3)
Restructuring and repositioning expenses	6.7	7.8	22.6	15
Operating Segments
Segment Reporting Information [Line Items]
Net sales	249.6	248.4	725.8	660.5
Segment Operating Income	28.6	44.4	89.3	89
Corporate
Segment Reporting Information [Line Items]
Restructuring and repositioning expenses	3.6	7	9	10.7
SCC \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	142	138.3	410.5	379.6
Segment Operating Income	7.7	18.8	29.1	37.7
Restructuring and repositioning expenses	0.9	0.6	7.3	3.2
SBM \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	107.6	110.1	315.3	280.9
Segment Operating Income	20.9	25.6	60.2	51.3
Restructuring and repositioning expenses	$ 2.2	$ 0.2	$ 6.3	$ 1.1

Operating Segment and Geograp_4

Operating Segment and Geographic Information - Reconciliation of Segment Data to Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total segment operating income	$ (75.1)	$ 29.4	$ (234.6)	$ (126.3)
Restructuring and repositioning expenses		(7.8)		(15)
Corporate costs	(59.2)	(64.7)	(190)	(198.8)
Gain on sale of corporate headquarters	0	110.2	0	110.2
Net income attributable to noncontrolling interests	0	0.2	0.2	0.4
Income from continuing operations before income taxes	9.4	131.2	29.5	135.7
Operating Segments
Segment Reporting Information [Line Items]
Total segment operating income	28.6	44.4	89.3	89
Corporate
Segment Reporting Information [Line Items]
Corporate costs	(2.6)	(7.1)	(16.6)	(19.7)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Restructuring and repositioning expenses	(6.7)	(7.8)	(22.6)	(15)
Interest expense, net	(5.5)	(5.3)	(16.3)	(15.1)
Third-party and other acquisition-related costs	(2.9)	0	(3.4)	(0.7)
Certain pension costs	(1.5)	(1.3)	(4.4)	(3.9)
Shareholder activism and other related costs	0	(2.1)	0	(9.5)
Gain on sale of corporate headquarters	0	110.2	0	110.2
Net income attributable to noncontrolling interests	0	0.2	0.2	0.4
Gain on Brazil tax recoveries	$ 0	$ 0	$ 3.3	$ 0

Operating Segment and Geograp_5

Operating Segment and Geographic Information - Geographic Area Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 249.6	$ 248.4	$ 725.8	$ 660.5
Total North America
Segment Reporting Information [Line Items]
Net sales	136.6	141.2	386.8	372.7
United States
Segment Reporting Information [Line Items]
Net sales	127.8	132.5	363.8	351.8
Canada and Other
Segment Reporting Information [Line Items]
Net sales	8.8	8.7	23	20.9
Europe Middle East Africa
Segment Reporting Information [Line Items]
Net sales	50.2	47.4	148.9	126.3
Asia Pacific
Segment Reporting Information [Line Items]
Net sales	45	47.4	144.3	127.4
Latin America
Segment Reporting Information [Line Items]
Net sales	$ 17.8	$ 12.4	$ 45.8	$ 34.1

Revisions of Previously Issue_3

Revisions of Previously Issued Consolidated Financial Statements - Condensed Consolidated Statements of Operations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales	$ 249.6	$ 248.4	$ 725.8	$ 660.5
Cost of goods sold	165.1	146.6	461.7	398.5
Gross profit	84.5	101.8	264.1	262
Selling, general and administrative expenses	59.2	64.7	190	198.8
Interest expense and related financing costs	5.6	5.6	16.8	16.3
Restructuring Costs and Asset Impairment Charges		7.8		15
Gain on sale of corporate headquarters	0	(110.2)	0	(110.2)
Other expense, net	3.6	2.7	5.2	6.4
Total costs (income)	75.1	(29.4)	234.6	126.3
Income from continuing operations before income taxes	9.4	131.2	29.5	135.7
Income tax expense	(1.6)	(31)	(9.6)	(34)
Income from continuing operations	7.8	100.2	19.9	101.7
Loss from discontinued operations, net of income taxes	(0.1)	(0.1)	(0.3)	(0.4)
Net income	7.7	100.1	19.6	101.3
Less: Net income attributable to noncontrolling interests	0	(0.2)	(0.2)	(0.4)
Net income attributable to GCP shareholders	7.7	99.9	19.4	100.9
Amounts Attributable to GCP Shareholders:
Net income from continuing operations attributable to GCP shareholders	7.8	100	19.7	101.3
Loss from discontinued operations, net of income taxes	(0.1)	(0.1)	(0.3)	(0.4)
Net income attributable to GCP shareholders	7.7	99.9	19.4	100.9
Comprehensive (loss) income attributable to GCP shareholders	$ (4.8)	$ 110.7	$ 3.9	$ 83
Basic earnings per share:
Net income from continuing operations attributable to GCP shareholders (in usd per share)	$ 0.11	$ 1.37	$ 0.27	$ 1.39
Loss from discontinued operations, net of income taxes (in usd per share)	(0.01)	0	(0.01)	(0.01)
Net income attributable to GCP shareholders (in usd per share)	$ 0.10	$ 1.37	$ 0.26	$ 1.38
Weighted average number of basic shares (in shares)	73.5	73	73.3	72.9
Diluted earnings per share:
Income from continuing operations attributable to GCP shareholders (in usd per share)	$ 0.11	$ 1.36	$ 0.27	$ 1.39
Loss from discontinued operations, net of income taxes (in usd per share)	(0.01)	0	(0.01)	(0.01)
Net income attributable to GCP shareholders (in usd per share)	$ 0.10	$ 1.36	$ 0.26	$ 1.38
Weighted average number of diluted shares (in shares)	73.6	73.2	73.5	73.1
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		$ 248.4		$ 660.5
Cost of goods sold		147		400.8
Gross profit		101.4		259.7
Selling, general and administrative expenses		65.2		199
Interest expense and related financing costs		5.6		16.3
Restructuring Costs and Asset Impairment Charges		7.8		15
Gain on sale of corporate headquarters		(110.2)		(110.2)
Other expense, net		2.7		6.4
Total costs (income)		(28.9)		126.5
Income from continuing operations before income taxes		130.3		133.2
Income tax expense		(30.6)		(33.2)
Income from continuing operations		99.7		100
Loss from discontinued operations, net of income taxes		(0.1)		(0.4)
Net income		99.6		99.6
Less: Net income attributable to noncontrolling interests		(0.2)		(0.4)
Net income attributable to GCP shareholders		99.4		99.2
Amounts Attributable to GCP Shareholders:
Net income from continuing operations attributable to GCP shareholders		99.5		99.6
Loss from discontinued operations, net of income taxes		(0.1)		(0.4)
Net income attributable to GCP shareholders		99.4		99.2
Comprehensive (loss) income attributable to GCP shareholders		$ 110.2		$ 81.3
Basic earnings per share:
Net income from continuing operations attributable to GCP shareholders (in usd per share)		$ 1.36		$ 1.37
Loss from discontinued operations, net of income taxes (in usd per share)		0		(0.01)
Net income attributable to GCP shareholders (in usd per share)		$ 1.36		$ 1.36
Weighted average number of basic shares (in shares)		73		72.9
Diluted earnings per share:
Income from continuing operations attributable to GCP shareholders (in usd per share)		$ 1.36		$ 1.36
Loss from discontinued operations, net of income taxes (in usd per share)		0		0
Net income attributable to GCP shareholders (in usd per share)		$ 1.36		$ 1.36
Weighted average number of diluted shares (in shares)		73.2		73.1
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		$ 0		$ 0
Cost of goods sold		(0.4)		(2.3)
Gross profit		0.4		2.3
Selling, general and administrative expenses		(0.5)		(0.2)
Interest expense and related financing costs		0		0
Restructuring Costs and Asset Impairment Charges		0		0
Gain on sale of corporate headquarters		0		0
Other expense, net		0		0
Total costs (income)		(0.5)		(0.2)
Income from continuing operations before income taxes		0.9		2.5
Income tax expense		(0.4)		(0.8)
Income from continuing operations		0.5		1.7
Loss from discontinued operations, net of income taxes		0		0
Net income		0.5		1.7
Less: Net income attributable to noncontrolling interests		0		0
Net income attributable to GCP shareholders		0.5		1.7
Amounts Attributable to GCP Shareholders:
Net income from continuing operations attributable to GCP shareholders		0.5		1.7
Loss from discontinued operations, net of income taxes		0		0
Net income attributable to GCP shareholders		0.5		1.7
Comprehensive (loss) income attributable to GCP shareholders		$ 0.5		$ 1.7
Basic earnings per share:
Net income from continuing operations attributable to GCP shareholders (in usd per share)		$ 0.01		$ 0.02
Loss from discontinued operations, net of income taxes (in usd per share)		0		0
Net income attributable to GCP shareholders (in usd per share)		0.01		$ 0.02
Weighted average number of basic shares (in shares)
Diluted earnings per share:
Income from continuing operations attributable to GCP shareholders (in usd per share)		0		$ 0.03
Loss from discontinued operations, net of income taxes (in usd per share)		0		(0.01)
Net income attributable to GCP shareholders (in usd per share)		$ 0		$ 0.02
Weighted average number of diluted shares (in shares)		0

Revisions of Previously Issue_4

Revisions of Previously Issued Consolidated Financial Statements - Condensed Consolidated Statements of Stockholders’ Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Beginning balance		$ 516.4	$ 654.1	$ 541.1
Net income	$ 7.7	100.1	19.6	101.3
Share-based compensation		3.1		5.9
Exercise of stock options		0.4		1.1
Share repurchases		(1.1)		(1.4)
Dividends and other changes in non-controlling interest		(0.1)		(0.5)
Other comprehensive (loss) income	(12.5)	10.8	(15.5)	(17.9)
Ending balance	$ 666.7	629.6	$ 666.7	629.6
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Beginning balance		515.2		541.1
Net income		99.6		99.6
Share-based compensation		3.1		5.9
Exercise of stock options		0.4		1.1
Share repurchases		(1.1)		(1.4)
Dividends and other changes in non-controlling interest		(0.1)		(0.5)
Other comprehensive (loss) income		10.8		(17.9)
Ending balance		627.9		627.9
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Beginning balance		1.2		0
Net income		0.5		1.7
Share-based compensation		0		0
Exercise of stock options		0		0
Share repurchases		0		0
Dividends and other changes in non-controlling interest		0		0
Other comprehensive (loss) income		0		0
Ending balance		$ 1.7		$ 1.7

Revisions of Previously Issue_5

Revisions of Previously Issued Consolidated Financial Statements - Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES
Net income attributable to GCP shareholders	$ 7.7	$ 100.1	$ 19.6	$ 101.3
Loss from discontinued operations, net of income taxes	(0.1)	(0.1)	(0.3)	(0.4)
Income from continuing operations	7.8	100.2	19.9	101.7
Reconciliation to net cash provided by operating activities:
Loss (gain) on disposal of property and equipment			0.8	(109.7)
Depreciation and amortization			33.7	34.5
Deferred income taxes			(5.7)	21.9
Stock-based compensation expense			4.4	3.8
Unrealized loss on foreign currency			2.3	2.7
Amortization of debt discount and financing costs			1.1	1.1
Changes in assets and liabilities, excluding effect of currency translation
Trade accounts receivable			(4.2)	8.6
Inventories			(34.4)	3.2
Accounts payable			5.4	(3.9)
Pension and postretirement plans, net			3	(12.4)
Other assets and liabilities, net			(0.5)	7.8
Net cash provided by operating activities from continuing operations			25.8	59.3
Net cash used in operating activities from discontinued operations			(0.3)	(2.5)
Net cash provided by operating activities			25.5	56.8
INVESTING ACTIVITIES
Capital expenditures			(23.9)	(28)
Proceeds from sale of corporate headquarters, net of transaction costs			0	122.5
Other investing activities			0.1	0.4
Net cash (used in) provided by investing activities from continuing operations			(23.8)	94.9
FINANCING ACTIVITIES
Borrowings under credit arrangements			0.5	1.5
Proceeds from exercise of stock options			4.6	1.1
Payments on finance lease obligations			(0.5)	(0.6)
Other financing activities			(0.7)	(1.3)
Net cash provided by financing activities from continuing operations			2.2	0.7
Effect of currency exchange rate changes on cash and cash equivalents			(5.1)	(4)
(Decrease) increase in cash and cash equivalents			(1.2)	148.4
Cash and cash equivalents, beginning of period			482.7	325
Cash and cash equivalents, end of period	$ 481.5	473.4	$ 481.5	473.4
Previously Reported
OPERATING ACTIVITIES
Net income attributable to GCP shareholders		99.6		99.6
Loss from discontinued operations, net of income taxes		(0.1)		(0.4)
Income from continuing operations		99.7		100
Reconciliation to net cash provided by operating activities:
Loss (gain) on disposal of property and equipment				(109.7)
Depreciation and amortization				34.5
Deferred income taxes				21.1
Stock-based compensation expense				3.8
Unrealized loss on foreign currency				2.7
Amortization of debt discount and financing costs				1.1
Changes in assets and liabilities, excluding effect of currency translation
Trade accounts receivable				8.6
Inventories				3.2
Accounts payable				(3.9)
Pension and postretirement plans, net				(12.4)
Other assets and liabilities, net				10.3
Net cash provided by operating activities from continuing operations				59.3
Net cash used in operating activities from discontinued operations				(2.5)
Net cash provided by operating activities				56.8
INVESTING ACTIVITIES
Capital expenditures				(28)
Proceeds from sale of corporate headquarters, net of transaction costs				122.5
Other investing activities				0.4
Net cash (used in) provided by investing activities from continuing operations				94.9
FINANCING ACTIVITIES
Borrowings under credit arrangements				1.5
Proceeds from exercise of stock options				1.1
Payments on finance lease obligations				(0.6)
Other financing activities				(1.3)
Net cash provided by financing activities from continuing operations				0.7
Effect of currency exchange rate changes on cash and cash equivalents				(4)
(Decrease) increase in cash and cash equivalents				148.4
Cash and cash equivalents, beginning of period				325
Cash and cash equivalents, end of period		473.4		473.4
Adjustments
OPERATING ACTIVITIES
Net income attributable to GCP shareholders		0.5		1.7
Loss from discontinued operations, net of income taxes		0		0
Income from continuing operations		0.5		1.7
Reconciliation to net cash provided by operating activities:
Loss (gain) on disposal of property and equipment				0
Depreciation and amortization				0
Deferred income taxes				0.8
Stock-based compensation expense				0
Unrealized loss on foreign currency				0
Amortization of debt discount and financing costs				0
Changes in assets and liabilities, excluding effect of currency translation
Trade accounts receivable				0
Inventories				0
Accounts payable				0
Pension and postretirement plans, net				0
Other assets and liabilities, net				(2.5)
Net cash provided by operating activities from continuing operations				0
Net cash used in operating activities from discontinued operations				0
Net cash provided by operating activities				0
INVESTING ACTIVITIES
Capital expenditures				0
Proceeds from sale of corporate headquarters, net of transaction costs				0
Other investing activities				0
Net cash (used in) provided by investing activities from continuing operations				0
FINANCING ACTIVITIES
Borrowings under credit arrangements				0
Proceeds from exercise of stock options				0
Payments on finance lease obligations				0
Other financing activities				0
Net cash provided by financing activities from continuing operations				0
Effect of currency exchange rate changes on cash and cash equivalents				0
(Decrease) increase in cash and cash equivalents				0
Cash and cash equivalents, beginning of period				0
Cash and cash equivalents, end of period		$ 0		$ 0