GCP Applied (GCP) 10-Q 5 Aug 21 2021 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2021	Jul. 29, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 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	62 Whittemore Avenue
Entity Address, City or Town	Cambridge
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02140-1623
City Area Code	617
Local Phone Number	876-1400
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	GCP
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		73,484,008
Entity Central Index Key	0001644440
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales		$ 253.4	$ 195.4	$ 476.2	$ 412.1
Cost of goods sold		160.3	118	296.6	251.9
Gross profit		93.1	77.4	179.6	160.2
Selling, general and administrative expenses		64.2	66	130.8	134.1
Research and development expenses		4.3	3.7	8.8	8.6
Interest expense and related financing costs		5.6	5	11.2	10.7
Repositioning expenses		0.5	1	1.8	3.7
Restructuring expenses and asset write offs		6.5	0.4	14.1	3.5
Other income, net		(5.5)	(2.7)	(7.2)	(4.9)
Total costs and expenses		75.6	73.4	159.5	155.7
Income from continuing operations before income taxes		17.5	4	20.1	4.5
Provision for income taxes		(7)	(4.6)	(8)	(3)
Income (loss) from continuing operations		10.5	(0.6)	12.1	1.5
Loss from discontinued operations, net of income taxes		(0.2)	0	(0.2)	(0.3)
Net income (loss)		10.3	(0.6)	11.9	1.2
Less: Net income attributable to noncontrolling interests		(0.1)	(0.1)	(0.2)	(0.2)
Net income (loss) attributable to GCP shareholders		10.2	(0.7)	11.7	1
Amounts Attributable to GCP Shareholders:
Income (loss) from continuing operations attributable to GCP shareholders		10.4	(0.7)	11.9	1.3
Loss from discontinued operations, net of income taxes		(0.2)	0	(0.2)	(0.3)
Net income (loss) attributable to GCP shareholders		$ 10.2	$ (0.7)	$ 11.7	$ 1
Basic earnings (loss) per share:
Income (loss) from continuing operations attributable to GCP shareholders (in usd per share)	[1]	$ 0.14	$ (0.01)	$ 0.16	$ 0.02
Loss from discontinued operations, net of income taxes (in usd per share)	[1]	0	0	0	0
Net income (loss) attributable to GCP shareholders (in usd per share)	[1],[2]	$ 0.14	$ (0.01)	$ 0.16	$ 0.01
Weighted average number of basic shares (in shares)	[1]	73.4	72.9	73.2	72.9
Diluted earnings (loss) per share:
Income (loss) from continuing operations attributable to GCP shareholders (in usd per share)	[1]	$ 0.14	$ (0.01)	$ 0.16	$ 0.02
Loss from discontinued operations, net of income taxes (in usd per share)	[1]	0	0	0	0
Net income (loss) attributable to GCP shareholders (in usd per share)	[1],[2]	$ 0.14	$ (0.01)	$ 0.16	$ 0.01
Weighted average number of diluted shares (in shares)	[1]	73.5	72.9	73.4	73
[1]	Dilutive effect is only applicable to the periods during which GCP generated net income from continuing operations.
[2]	Amounts may not sum due to rounding.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 10.3	$ (0.6)	$ 11.9	$ 1.2
Other comprehensive income (loss):
Defined benefit pension and other postretirement plans, net of income taxes	0.1	0	0.1	0.1
Currency translation adjustments, net of income taxes	4.9	4.9	(3.1)	(28.9)
(Loss) gain from hedging activities, net of income taxes	0	(0.1)	0	0.1
Total other comprehensive income (loss)	5	4.8	(3)	(28.7)
Comprehensive income (loss)	15.3	4.2	8.9	(27.5)
Less: Comprehensive income attributable to noncontrolling interests	(0.1)	(0.1)	(0.2)	(0.2)
Comprehensive income (loss) attributable to GCP shareholders	$ 15.2	$ 4.1	$ 8.7	$ (27.7)

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 488.9	$ 482.7
Trade accounts receivable, net of allowance for credit losses of $6.2 million and $7.0 million, respectively	167.7	169.4
Inventories, net	128.3	98.4
Other current assets	46.3	41.2
Total Current Assets	831.2	791.7
Properties and equipment, net	216.8	225.6
Operating lease right-of-use assets	35.1	40
Goodwill	214.5	215
Technology and other intangible assets, net	66.6	70.9
Deferred income taxes	11.2	9.6
Overfunded defined benefit pension plans	30.4	29.7
Other assets	33.4	35.1
Total Assets	1,439.2	1,417.6
Current Liabilities
Debt payable within one year	2.4	2.8
Operating lease obligations payable within one year	7.2	8
Accounts payable	107.4	87.8
Other current liabilities	116.7	125.8
Total Current Liabilities	233.7	224.4
Debt payable after one year	348.9	348.9
Income taxes payable	23.2	28.4
Deferred income taxes	16.7	14.9
Operating lease obligations	24.7	26.2
Unrecognized tax benefits	41.1	41
Underfunded and unfunded defined benefit pension plans	64.4	62.9
Other liabilities	16.8	16.8
Total Liabilities	769.5	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: 73,482,394 and 73,082,066, respectively	0.7	0.7
Paid-in capital	70.2	61.9
Accumulated earnings	722	710.3
Accumulated other comprehensive loss	(113.5)	(110.5)
Treasury stock	(12.3)	(10.7)
Total GCP's Shareholders' Equity	667.1	651.7
Noncontrolling interests	2.6	2.4
Total Stockholders' Equity	669.7	654.1
Total Liabilities and Stockholders' Equity	$ 1,439.2	$ 1,417.6

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for credit losses	$ 6.2	$ 7
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)	73,482,394	73,082,066

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Millions		Total	Common Stock	Treasury Stock		Additional Paid-in Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss	Non-Controlling Interests
Beginning balance (in shares) at Dec. 31, 2019	[1]		73,200,000	300,000
Beginning balance at Dec. 31, 2019		$ 541	$ 0.7	$ (8.6)		$ 53.4	$ 610.1	$ (117)	$ 2.4
Increase (Decrease) in Stockholders' Equity
Net income		1.2					1		0.2
Issuance of common stock in connection with stock plans (in shares)	[1]		100,000
Share-based compensation		2.8				2.8
Exercise of stock options	[1]	$ 0.7				0.7
Share repurchases (in shares)		17,300		100,000	[1],[2]
Share repurchases	[2]	$ (0.3)		$ (0.3)
Other comprehensive loss		(28.7)						(28.7)
Dividends and other changes in noncontrolling interest		(0.4)							(0.4)
Ending balance (in shares) at Jun. 30, 2020			73,300,000	400,000
Ending balance at Jun. 30, 2020		516.3	$ 0.7	$ (8.9)		56.9	611.1	(145.7)	2.2
Beginning balance (in shares) at Mar. 31, 2020			73,300,000	400,000
Beginning balance at Mar. 31, 2020		509.9	$ 0.7	$ (8.9)		54.3	611.8	(150.5)	2.5
Increase (Decrease) in Stockholders' Equity
Net income		(0.6)					(0.7)		0.1
Share-based compensation		2.3				2.3
Exercise of stock options		0.3				0.3
Other comprehensive loss		4.8						4.8
Dividends and other changes in noncontrolling interest		(0.4)							(0.4)
Ending balance (in shares) at Jun. 30, 2020			73,300,000	400,000
Ending balance at Jun. 30, 2020		516.3	$ 0.7	$ (8.9)		56.9	611.1	(145.7)	2.2
Beginning balance (in shares) at Dec. 31, 2020	[1]		73,500,000	400,000
Beginning balance at Dec. 31, 2020		654.1	$ 0.7	$ (10.7)		61.9	710.3	(110.5)	2.4
Increase (Decrease) in Stockholders' Equity
Net income		11.9					11.7		0.2
Issuance of common stock in connection with stock plans (in shares)	[1]		200,000
Share-based compensation	[3]	4				4
Exercise of stock options (in shares)	[1]		300,000
Exercise of stock options	[1]	$ 4.3				4.3
Share repurchases (in shares)		62,400		100,000	[1],[2]
Share repurchases	[2]	$ (1.6)		$ (1.6)
Other comprehensive loss		(3)						(3)
Ending balance (in shares) at Jun. 30, 2021	[1]		74,000,000	500,000
Ending balance at Jun. 30, 2021		669.7	$ 0.7	$ (12.3)		70.2	722	(113.5)	2.6
Beginning balance (in shares) at Mar. 31, 2021			73,700,000	500,000
Beginning balance at Mar. 31, 2021		650.6	$ 0.7	$ (11.4)		65.5	711.8	(118.5)	2.5
Increase (Decrease) in Stockholders' Equity
Net income		10.3					10.2		0.1
Issuance of common stock in connection with stock plans (in shares)			100,000
Share-based compensation		2.6				2.6
Exercise of stock options (in shares)			200,000
Exercise of stock options		2.1				2.1
Share repurchases (in shares)				0
Share repurchases		(0.9)		$ (0.9)
Other comprehensive loss		5						5
Ending balance (in shares) at Jun. 30, 2021	[1]		74,000,000	500,000
Ending balance at Jun. 30, 2021		$ 669.7	$ 0.7	$ (12.3)		$ 70.2	$ 722	$ (113.5)	$ 2.6
[1]	The par value of common shares issued may not be included in the table due to rounding. Total share amounts for common stock and treasury stock may not sum due to rounding.
[2]	Relates to shares withheld for tax payments on exercise of stock options and vesting of RSUs and PBUs. Refer to Note 14, “Stock Incentive Plans”, for further information.
[3]	During the six months ended June 30, 2021, $0.9 million of the stock-based compensation expense is included in "Restructuring expenses and asset write offs" related to accelerated vesting of stock options, RSUs and PBUs.

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total stock compensation (benefit) expense	$ 1.8	$ 1.5	$ 3.5	$ 2.3
2019 Phase 2 Plan
Total stock compensation (benefit) expense	$ 0.2		$ 0.9

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
Net income (loss)	$ 11.9	$ 1.2
Less: Loss from discontinued operations	(0.2)	(0.3)
Income from continuing operations	12.1	1.5
Reconciliation to net cash provided by operating activities:
Depreciation and amortization	22.4	22.7
Amortization of debt discount and financing costs	0.8	0.7
Stock-based compensation expense	2.5	2.3
Unrealized (gain) loss on foreign currency	(2.1)	1.6
Deferred income taxes	(1.6)	(5.4)
Loss on disposal of property and equipment	1.5	0.1
Changes in assets and liabilities, excluding effect of currency translation:
Trade accounts receivable	0.4	30.3
Inventories	(30.7)	(5.1)
Accounts payable	20.3	(13.5)
Pension assets and liabilities, net	1.8	1.6
Other assets and liabilities, net	(6.4)	(16.9)
Net cash provided by operating activities from continuing operations	21	19.9
Net cash used in operating activities from discontinued operations	(0.2)	(2.3)
Net cash provided by operating activities	20.8	17.6
INVESTING ACTIVITIES
Capital expenditures	(14.9)	(18.8)
Other investing activities	0.1	0.4
Net cash used in investing activities from continuing operations	(14.8)	(18.4)
FINANCING ACTIVITIES
Repayments under credit arrangements	(0.3)	0
Payments on finance lease obligations	(0.3)	(0.4)
Payments of tax withholding obligations related to employee equity awards	(1.6)	(0.3)
Proceeds from exercise of stock options	4.3	0.7
Payments of dividends to noncontrolling interests	0	(0.4)
Net cash provided by (used in) financing activities from continuing operations	2.1	(0.4)
Effect of currency exchange rate changes on cash and cash equivalents	(1.9)	(5.6)
Increase (decrease) in cash and cash equivalents	6.2	(6.8)
Cash and cash equivalents, beginning of period	482.7	325
Cash and cash equivalents, end of period	488.9	318.2
Supplemental disclosure of non-cash investing activities:
Property and equipment purchases unpaid and included in accounts payable	$ 5.5	$ 5.3

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies	6 Months Ended
	Jun. 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") manufactures and markets concrete admixtures and cement additives and supplies in-transit monitoring systems for concrete producers. Specialty Building Materials ("SBM") manufactures and markets sheet and liquid membrane systems that protect structures from water, air and vapor penetration, fireproofing and other products designed to protect the building envelope. Basis of Presentation The accompanying unaudited Consolidated Financial Statements are presented on a consolidated basis and include all of the accounts and operations of GCP and its majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The financial statements reflect the financial position, results of operations and cash flows of GCP in accordance with generally accepted accounting principles in the United States ("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 Consolidated Balance Sheet as of 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 six months ended June 30, 2021 are not necessarily indicative of the results of operations for the year ending December 31, 2021. Revisions of Previously Issued 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 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 consolidated financial statements were materially misstated. The Company concluded the errors were not material individually or in the aggregate to the previously issued consolidated financial statements. In accordance with ASC 250-10-S99-2, the Company has corrected these errors by revising previously filed unaudited quarterly consolidated financial statements for the three and six months ended June 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 consolidated financial statements for the three and six months ended June 30, 2020. Please refer to Note 18, “Revisions of Previously Issued 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 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 the evolving COVID-19 pandemic on the global economy, the Company's business, financial position and results of operations. GCP has made certain estimates within its financial statements related to the impact of COVID-19, including allowances for credit losses related to the estimated amount of receivables not expected to be collected and excess, obsolete or damaged inventories, future expected cash flows related to impairment assessments of goodwill and long-lived assets, incentive compensation accruals, contingent liabilities, and sales allowances related to volume rebates recognized based on anticipated sales volume. There may be changes to the Company's estimates in future periods due to uncertainty associated with the impact of COVID-19, the extent of which will depend largely on future developments, including new information which may emerge concerning the resurgence of the COVID-19 pandemic, as well as additional and unanticipated actions by government authorities to further contain the spread of COVID-19, 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 7, "Income Taxes," for details regarding estimates used in accounting for income tax matters, including unrecognized tax benefits. Reclassifications Certain amounts in prior period financial statements have been reclassified to conform to the current period presentation. Such reclassifications have not materially affected previously reported amounts. Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board ("FASB") amended Accounting Standards Codification ("ASC") 740, Income Taxes (issued under Accounting Standards Update ("ASU") 2019-12, Simplifying the Accounting for Income Taxes ). This amendment removes certain exceptions to the general principles of ASC 740, and clarifies and amends the existing guidance to improve consistent application. GCP adopted the guidance effective January 1, 2021. The adoption did not have a material impact on its results of operations, financial position and cash flows. Discontinued Operations On July 3, 2017 (the "Closing Date"), GCP completed the sale of its Darex Packaging Technologies ("Darex") business to Henkel AG & Co. KGaA (“Henkel”) for $1.06 billion in cash (the "Disposition"). The agreement with Henkel governing the Disposition (the “Amended Purchase Agreement”) 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 accompanying unaudited Consolidated Statements of Operations and unaudited Consolidated Statements of Cash Flows for all periods presented. Unless otherwise noted, the information throughout the Notes to the accompanying unaudited Consolidated Financial Statements pertains only to the continuing operations of GCP. Other During the three and six months ended June 30, 2021, except as discussed above, there were no material changes to the Company's significant accounting and financial reporting policies from those reflected in the Annual Report on Form 10-K for the year ended December 31, 2020. For further information with regard to the Company’s Significant Accounting Policies, please refer to Note 1, "Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies," to the Company’s Consolidated Financial Statements included in the 2020 Annual Report on Form 10-K.

Revenue from Lessor Arrangement

Revenue from Lessor Arrangements and Contracts with Customers	6 Months Ended
	Jun. 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 Specialty Construction Chemicals ("SCC") operating segment, as well as sheet and liquid membrane systems and other specialty products designed to protect the building envelope within its Specialty Building Materials ("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 arrangements within the SBM operating segment, the transfer of control takes place at a point in time when products are shipped to the customer. The Company generates revenue from long-term arrangements within its SCC operating segment, which generally consist of VERIFI ® and Ductilcrete sales arrangements. VERIFI ® sales arrangements involve installing equipment on the customers’ trucks and at their plants, as well as performing slump management and truck location tracking services. The Company recognizes lease and service revenue for these arrangements. Revenue generated from VERIFI® sales arrangements represented less than 10% of the Company's consolidated revenue during the three and six months ended June 30, 2021 and 2020. During the three months ended June 30, 2021 and 2020, the Company recognized lease revenue of $9.8 million and $9.1 million, respectively, and service revenue of $2.3 million and $1.6 million, respectively. During the six months ended June 30, 2021 and 2020, the Company recognized lease revenue of $19.2 million and $17.9 million, respectively, and service revenue of $4.3 million and $3.0 million, respectively. Lease revenue consists of dispenser lease revenue of $6.1 million and $6.4 million during the three months ended June 30, 2021 and 2020, respectively, and $12.2 million and $13.1 million during the six months ended June 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 Consolidated Statements of Operations. Revenue generated from Ductilcrete sales arrangements represented less than 10% of the Company's consolidated revenue during the three and six months ended June 30, 2021 and 2020. The Company’s revenue is principally recognized as goods and services are delivered and performance obligations are satisfied upon delivery. The Company has certain long-term arrangements resulting in remaining obligations for which the work has not been performed or has been partially performed. As of June 30, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations was $10.1 million, including the estimated transaction price to be earned as revenue over the remaining term of these contracts, which is generally one the SCC or SBM operating segments were not material as of June 30, 2021 and December 31, 2020. Additionally, the amounts recorded in the accompanying unaudited Consolidated Statements of Operations during the three and six months ended June 30, 2021 and 2020 related to changes in the contract assets and liabilities were not material. For further information on revenue recognition related to product sale arrangements, please refer to Note 2, "Revenue from Lessor Arrangements and Contracts with Customers", to the Company’s Consolidated Financial Statements included in the 2020 Annual Report on Form 10-K.

Inventories, net

Inventories, net	6 Months Ended
	Jun. 30, 2021
Inventory Disclosure [Abstract]
Inventories, net	Inventories, net The following is a summary of inventories presented in the accompanying unaudited Consolidated Balance Sheets at June 30, 2021 and December 31, 2020: (In millions) June 30, December 31, Raw materials $ 58.4 $ 41.3 In process 5.1 4.2 Finished products and other 64.8 52.9 Total inventories, net $ 128.3 $ 98.4 The "Finished products and other" category presented in the table above includes "other" inventories, which consist of finished products purchased rather than produced by GCP of $10.1 million

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 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. As of June 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 Consolidated Balance Sheets. Each contract has a notional amount of €10.0 million and matures annually starting on June 13, 2022 through June 13, 2025. During the three months ended June 30, 2021, GCP settled one contract with a notional amount of €10.0 million upon its maturity on June 14, 2021 and entered into a new contract with a notional amount of €10.0 million maturing on June 13, 2025. The forward contracts are designated and qualify as net investment hedges for which effectiveness is assessed based on the spot rate method. Please refer to Note 4, "Derivative Instruments", to the Company’s Consolidated Financial Statements included in the 2020 Annual Report on Form 10-K for further information on net investment hedges. The following table summarizes the fair value of the Company’s derivative instruments designated as net investment hedges as of June 30, 2021 and December 31, 2020: (In millions) June 30, 2021 December 31, 2020 Derivative assets (1) : Foreign exchange forward contracts $ 0.6 $ — Derivative liability (1) : Foreign exchange forward contracts $ (0.8) $ (1.8) __________________________ (1) The fair value of derivative instruments is measured based on expected future cash flows discounted at market interest rates using observable market inputs and classified as Level 2 within the fair value hierarchy. As of June 30, 2021, fair value of derivative assets of $0.3 million and $0.3 million, respectively, is recorded within "Other current assets" and "Other assets" in the accompanying unaudited Consolidated Balance Sheets, and fair value of derivative liability of $0.8 million is recorded within "Other Liabilities" in the accompanying unaudited Consolidated Balance Sheets. As of December 31, 2020, fair value of derivative liabilities of $0.4 million and $1.4 million, respectively, is recorded within "Other current liabilities" and "Other liabilities" in the accompanying unaudited Consolidated Balance Sheets. The following table summarizes the amounts recorded in the Company's accompanying unaudited Consolidated Statements of Operations and Consolidated Statements of Comprehensive Loss related to forward contracts designated as net investment hedges for the three and six months ended June 30, 2021 and 2020: Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 (In millions) Other Income, net Cumulative Translation Adjustments (1) Other Income, net Cumulative Translation Adjustments (1) Gains (losses) on foreign exchange forward contracts $ 0.2 $ (0.5) $ 0.2 $ (0.8) Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 (In millions) Other Income, net Cumulative Translation Adjustments (1) Other Income, net Cumulative Translation Adjustments (1) Gains on foreign exchange forward contracts $ 0.4 $ 0.9 $ 0.5 $ 0.5 (1) The amount is presented net of tax benefit (expense) of $0.1 million and ($0.3) million, respectively, for the three and six months ended June 30, 2021. The amount is presented net of tax benefit (expense) of $0.2 million and ($0.2) million, respectively, for the three and six months ended June 30, 2020.

Debt and Other Borrowings

Debt and Other Borrowings	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt and Other Borrowings	Debt and Other Borrowings Components of Debt and Other Borrowings The following is a summary of obligations under senior notes and other borrowings at June 30, 2021 and December 31, 2020: (In millions) June 30, December 31, 5.5% Senior Notes due in 2026, net of unamortized debt issuance costs of $3.1 million and $3.3 million, respectively, at June 30, 2021 and December 31, 2020 $ 346.9 $ 346.6 Revolving credit facility due 2023 (1) — — Other borrowings (2) 4.4 5.1 Total debt 351.3 351.7 Less: debt payable within one year 2.4 2.8 Debt payable after one year $ 348.9 $ 348.9 Weighted average interest rates on total debt obligations 5.5 % 5.5 % __________________________ (1) Represents borrowings under the Revolving Credit Facility with an aggregate available principal amount of $350.0 million as of June 30, 2021 and December 31, 2020. (2) Represents borrowings of $1.7 million and $2.1 million, respectively, at June 30, 2021 and December 31, 2020, under various lines of credit and other borrowings, primarily by non-U.S. subsidiaries, with a combined maximum borrowing amount of $45.1 million, as well as $2.7 million and $3.0 million, respectively, of finance lease obligations. The principal maturities of debt obligations outstanding, net of debt issuance costs, were as follows at June 30, 2021: (In millions) Amount Remainder of 2021 $ 2.1 2022 0.8 2023 0.7 2024 0.7 2025 0.1 Thereafter 346.9 Total debt $ 351.3 5.5% Senior Notes GCP's outstanding 5.5% Senior Notes have an aggregate principal amount of $350.0 million maturing on April 15, 2026. Interest on the 5.5% Senior Notes is payable semi-annually in arrears on April 15 and October 15 of each year. The Company made an interest payment of $9.6 million on April 15, 2021. The Indenture contains certain customary affirmative and negative covenants and events of default, as described in Note 8, "Debt and Other Borrowings," to the Company's Consolidated Financial Statements included in the 2020 Annual Report in the Form 10-K. The Company was in compliance with all covenants and conditions under the Indenture as of June 30, 2021. There are no events of default under the Indenture as of June 30, 2021. Credit Agreement As of June 30, 2021 and December 31, 2020, there were no outstanding borrowings on the Revolving Credit Facility. There were $2.6 million in outstanding letters of credit which resulted in available credit of $347.4 million as of June 30, 2021 and December 31, 2020. There were no interest payments on the Revolving Credit Facility during the three and six months ended June 30, 2021 and 2020. The Credit Agreement contains conditions that would require mandatory principal payments in advance of the maturity date of the Revolving Credit Facility, as well as certain customary affirmative and negative covenants and events of default, as described in Note 8, "Debt and Other Borrowings," to the Company's Consolidated Financial Statements included in the 2020 Annual Report in the Form 10-K. The Company was in compliance with all covenant terms as of June 30, 2021. There are no events of default as of June 30, 2021. Debt Issuance Costs GCP recognizes expenses directly associated with obtaining the Revolving Credit Facility as debt issuance costs which are presented within "Other assets" in the accompanying unaudited Consolidated Balance Sheets. Such costs are amortized over the term of the Revolving Credit Facility and included in “Interest expense and related financing costs” in the accompanying unaudited Consolidated Statements of Operations. As of June 30, 2021 and December 31, 2020, the remaining unamortized debt issuance costs related to the Revolving Credit Facility were $1.7 million and $2.2 million, respectively. Debt Fair Value The carrying amount and fair value of GCP's debt and other borrowings were as follows: June 30, 2021 December 31, 2020 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value 5.5% Senior Notes due in 2026 $ 346.9 $ 361.3 $ 346.6 $ 362.0 Other borrowings 4.4 4.4 5.1 5.1 Total debt $ 351.3 $ 365.7 $ 351.7 $ 367.1 Fair value is determined based on Level 2 inputs, including expected future cash flows (discounted at market interest rates), estimated current market prices, and quotes from financial institutions. As of June 30, 2021, the fair value was higher than the carrying amount due to higher bond market prices. The carrying amount represents the aggregate principal amount at maturity reduced by the unamortized debt issuance costs.

Lessee Arrangements

Lessee Arrangements	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Lessee Arrangements	Lessee Arrangements The Company leases manufacturing and office facilities, as well as certain vehicles and equipment under operating leases. The following table summarizes components of lease expense for the three and six months ended June 30, 2021 and 2020: Three months ended June 30, Six months ended June 30, (In millions) 2021 2020 2021 2020 Operating lease expense $ 4.1 $ 3.0 $ 8.4 $ 6.2 Variable lease expense 1.5 1.3 2.5 2.4 Short-term lease expense 0.5 0.8 1.2 1.4 Total lease expense $ 6.1 $ 5.1 $ 12.1 $ 10.0 The following table summarizes supplemental cash flow information related to leases during the six months ended June 30, 2021 and 2020: Six months ended June 30, (In millions) 2021 2020 Cash paid for operating lease liabilities, classified as operating cash flows $ 5.3 $ 6.2 Operating lease right of use assets obtained in exchange for new lease obligations 2.3 11.8

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes attributable to continuing operations during the three months ended June 30, 2021 and 2020 was an income tax expense of $7.0 million and $4.6 million, respectively, representing effective tax rates of 40.0% and 115.0%, respectively. Income taxes attributable to continuing operations during the six months ended June 30, 2021 and 2020 was an income tax expense of $8.0 million and $3.0 million, respectively, representing effective tax rates of 39.8% and 66.7%, 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 June 30, 2021, was due to income tax expense on the United Kingdom rate change of $2.9 million, non-deductible executive compensation and other expenses of $0.7 million, and foreign rate differential of $1.0 million, offset by income tax benefit on valuation releases of $1.2 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 June 30, 2020, was primarily due to the reversal of $3.2 million of tax benefit recognized during the three months ended March 31, 2020 related to the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”), and tax expense $0.4 million and $0.4 million, respectively, for unrecognized tax benefits and valuation allowances. The difference between the U.S. federal income tax rate of 21.0% and GCP’s overall income tax rate for the six months ended June 30, 2021, was due to income tax expense on the United Kingdom rate change of $2.9 million, non-deductible executive compensation and other expenses of $0.8 million, and foreign rate differential of $1.0 million, offset by income tax benefits on valuation releases of $1.2 million. The difference between the U.S. federal income tax rate of 21.0% and GCP's overall income tax rate for the six months ended June 30, 2020 was primarily due to a tax expense of $0.7 million and $1.0 million, respectively, for increases in unrecognized tax benefits and valuation allowances. 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 and six months ended June 30, 2021 GCP recognized an income tax benefit of $1.2 million for $1.4 million of valuation allowance release on deferred tax assets in France offset by $0.2 million valuation allowance increases. During the three months ended June 30, 2020, GCP recognized $0.4 million of income tax expense on valuation allowance increases. During the six months ended June 30, 2020, GCP recognized income tax expense of $1.0 million for valuation allowances recorded against deferred tax assets 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 16, "Related Party Transactions and Transactions with Grace" for further information on the Tax Sharing Agreement.

Pension Plans and Other Postret

Pension Plans and Other Postretirement Benefit Plans	6 Months Ended
	Jun. 30, 2021
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Pension Plans and Other Postretirement Benefit Plans	Pension Plans and Other Postretirement Benefit Plans Pension Plans GCP sponsors defined benefit pension plans, primarily in the U.S. and the U.K., in which GCP employees and former employees participate. GCP records an asset or a liability to recognize the funded status of these pension plans in its accompanying unaudited Consolidated Balance Sheets. The following table presents the funded status of GCP's overfunded, underfunded and unfunded defined pension plans: (In millions) June 30, 2021 December 31, 2020 Overfunded defined benefit pension plans $ 30.4 $ 29.7 Underfunded defined benefit pension plans (35.5) (33.3) Unfunded defined benefit pension plans (28.9) (29.6) Total underfunded and unfunded defined benefit pension plans (64.4) (62.9) Pension liabilities included in other current liabilities (1.3) (1.4) Net funded status $ (35.3) $ (34.6) Components of Net Periodic Benefit Cost The components of GCP's net periodic benefit cost for the three and six months ended June 30, 2021 and 2020 are as follows: Three Months Ended June 30, 2021 2020 Pension Pension (In millions) U.S. Non-U.S. Total U.S. Non-U.S. Total Service cost $ 1.6 $ 0.2 $ 1.8 $ 1.6 $ 0.2 $ 1.8 Interest cost 1.2 0.7 1.9 1.2 1.0 2.2 Expected return on plan assets (1.6) (0.7) (2.3) (1.7) (1.1) (2.8) Amortization of prior service cost — 0.1 0.1 — 0.1 0.1 Net periodic benefit cost (1) $ 1.2 $ 0.3 $ 1.5 $ 1.1 $ 0.2 $ 1.3 Six Months Ended June 30, 2021 2020 Pension Pension (In millions) U.S. Non-U.S. Total U.S. Non-U.S. Total Service cost $ 3.1 $ 0.5 $ 3.6 $ 3.1 $ 0.4 $ 3.5 Interest cost 2.4 1.4 3.8 2.5 2.1 4.6 Expected return on plan assets (3.1) (1.5) (4.6) (3.3) (2.3) (5.6) Amortization of prior service cost — 0.1 0.1 — 0.1 0.1 Net periodic benefit cost (1) $ 2.4 $ 0.5 $ 2.9 $ 2.3 $ 0.3 $ 2.6 ________________________________ (1) Service cost component of net periodic benefit cost is included in "Selling, general and administrative expenses" and "Cost of goods sold" in the accompanying unaudited Consolidated Statements of Operations. All other components of net periodic benefit costs are presented in "Other income, net," within the accompanying unaudited Consolidated Statements of Operations. Pension Contributions and Funding GCP intends to satisfy its funding obligations under the U.S. qualified pension plans and to comply with all of the requirements of the Employee Retirement Income Security Act of 1974, as amended ("ERISA"). For ERISA purposes, funded status is calculated on a different basis than under U.S. GAAP. GCP made contributions of $0.1 million and $0.3 million, respectively, to the U.S. pension plans during the three and six months ended June 30, 2021. GCP made contributions of $0.6 million and $0.7 million, respectively, to the U.S. pension plans during the three and six months ended June 30, 2020. GCP intends to fund non-U.S. pension plans based on applicable legal requirements, as well as actuarial and trustee recommendations. During the three and six months ended June 30, 2021, GCP contributed $0.5 million and $0.8 million, respectively, to these non-U.S. plans. During the three and six months ended June 30, 2020, GCP contributed $0.3 million and $0.8 million, respectively, to these non-U.S. plans. Defined Contribution Retirement Plan GCP sponsors a defined contribution retirement plan for its employees in the U.S. which is a qualified plan under section 401(k) of the U.S. tax code. Under this plan, GCP contributes an amount equal to 100% of employee contributions, up to 6% of an individual employee's salary or wages. Additionally, GCP contributes up to 2% of a full amount of applicable employee compensation subject to a three-year vesting requirement. Applicable employees include those beginning employment with GCP on or after January 1, 2018 who are not eligible to participate in the GCP Applied Technologies Inc. Retirement Plan for Salaried Employees, which was closed to new hires effective January 1, 2018. GCP's costs related to this benefit plan amounted to $1.3 million and $2.3 million, respectively, during the three and six months ended June 30, 2021 and $0.9 million and $2.2 million, respectively, during the three and six months ended June 30, 2020. These costs are included in "Selling, general and administrative expenses" and "Cost of goods sold" in the accompanying unaudited Consolidated Statements of Operations.

Other Balance Sheet Information

Other Balance Sheet Information	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Balance Sheet Information	Other Balance Sheet Information The following is a summary of other current assets at June 30, 2021 and December 31, 2020: (In millions) June 30, December 31, Other Current Assets: Non-trade receivables $ 21.4 $ 20.4 Prepaid expenses and other current assets 16.9 11.1 Income taxes receivable 8.0 9.7 Total other current assets $ 46.3 $ 41.2 The following is a summary of other current liabilities at June 30, 2021 and December 31, 2020: (In millions) June 30, December 31, Other Current Liabilities: Accrued customer volume rebates $ 18.5 $ 24.4 Accrued compensation (1) 23.1 25.0 Income taxes payable 7.9 7.1 Accrued interest 4.0 4.0 Pension liabilities 1.3 1.4 Restructuring liability 16.1 18.0 Other accrued liabilities 45.8 45.9 Total other current liabilities $ 116.7 $ 125.8 ________________________________ (1) Accrued compensation presented in the table above includes salaries and wages, as well as estimated amounts due under the annual employee incentive programs.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and ContingenciesGCP enters into certain purchase commitments and is a party to many contracts containing guarantees and indemnification obligations, as described in Note 12, "Commitments and Contingencies" to the Company's Consolidated Financial Statements included in the 2020 Annual Report in the Form 10-K. There have been no material changes to these commitments and obligations during the six months ended June 30, 2021, except as described below. Although the outcome of each of the matters related to loss contingencies and obligations cannot be predicted with certainty, GCP has assessed the risk and has made accounting estimates and disclosures as required under U.S. GAAP. Environmental Matters GCP is subject to loss contingencies resulting from extensive and evolving federal, state, local and foreign environmental laws and regulations relating to the generation, storage, handling, discharge, disposition and stewardship of hazardous wastes and other materials. GCP recognizes accrued liabilities for anticipated costs associated with response efforts if, based on the results of the assessment, it concluded that a probable liability has been incurred and the cost can be reasonably estimated. As of June 30, 2021 and December 31, 2020, GCP did not have any material environmental liabilities. GCP's environmental liabilities are reassessed whenever circumstances become better defined or response efforts and their costs can be better estimated. These liabilities are evaluated based on currently available information, including the progress of remedial investigations at each site, the current status of discussions with regulatory authorities regarding the method and extent of remediation at each site, existing technology, prior experience in contaminated site remediation and the apportionment of costs among potentially responsible parties. Financial Assurances Financial assurances have been established for a variety of purposes, including insurance, environmental matters and other matters. At June 30, 2021 and December 31, 2020, GCP had gross financial assurances issued and outstanding of $6.2 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 During the year ended December 31, 2019, the Superior Judicial Court of Brazil (the "Court") filed its final ruling in favor of GCP Brasil Industria e Comercio de Produtos Quimicos ("GCP Brazil") related to a claim as to whether a certain state value-added tax should be included in the calculation of federal gross receipts taxes. The ruling allows GCP Brazil the right to recover, through offset of federal tax liabilities, amounts collected by the government from May 2012 to September 2017, including interest. In the second quarter, the Court rendered favorable decisions granting GCP Brazil the right to recover $3.3 million of state value-added tax. During the three months ended June 30, 2021, the Company included the recovery in “Other income, net” in the accompanying unaudited Consolidated Statements of Operations. 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 3, 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. On March 30, 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 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 six months ended June 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 consolidated financial position, results of operations and cash flows in particular quarterly or annual periods.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Share Repurchase Program On July 30, 2020, the Board of Directors (the “Board”) of GCP authorized a program to repurchase up to $100 million of the Company’s common stock which is effective through July 30, 2022. Share repurchases under the program may be made from time to time at the Board's discretion through open market purchases or privately negotiated transactions in accordance with applicable federal securities laws, including Rule 10b-18 of the Exchange Act. The share repurchase program is subject to a periodic review by the Board and may be suspended periodically or discontinued at any time. The Company plans to fund repurchases from its existing cash balance. No shares were repurchased by the Company during the three and six months ended June 30, 2021. Stockholders' Equity Activity The following table summarizes the Company’s stockholders' equity activity during the three months ended June 30, 2021 and 2020. Common Stock Treasury Stock (In millions) Number of Shares (2) Par Value Number of Shares (2) Cost Additional Paid-in Capital Accumulated Earnings Accumulated Other Comprehensive Loss Non-Controlling Interests Total Stockholders' Equity Balance, March 31, 2020 73.3 $ 0.7 0.4 $ (8.9) $ 54.3 $ 611.8 $ (150.5) $ 2.5 $ 509.9 Net (loss) income — — — — — (0.7) — 0.1 (0.6) Share-based compensation — — — — 2.3 — — — 2.3 Exercise of stock options (2) — — — — 0.3 — — — 0.3 Other comprehensive income — — — — — — 4.8 — 4.8 Dividends and other changes in noncontrolling interest — — — — — — — (0.4) (0.4) Balance, June 30, 2020 73.3 $ 0.7 0.4 $ (8.9) $ 56.9 $ 611.1 $ (145.7) $ 2.2 $ 516.3 Balance, March 31, 2021 73.7 $ 0.7 0.5 $ (11.4) $ 65.5 $ 711.8 $ (118.5) $ 2.5 $ 650.6 Net income — — — — — 10.2 — 0.1 10.3 Issuance of common stock in connection with stock plans (2) 0.1 — — — — — — — — Share-based compensation — — — — 2.6 — — — 2.6 Exercise of stock options (2) 0.2 — — — 2.1 — — — 2.1 Share repurchases (1) — — — (0.9) — — — — (0.9) Other comprehensive income — — — — — — 5.0 — 5.0 Balance, June 30, 2021 74.0 $ 0.7 0.5 $ (12.3) $ 70.2 $ 722.0 $ (113.5) $ 2.6 $ 669.7 .________________________________ (1) Relates to shares withheld for tax payments on exercise of stock options and vesting of RSUs and PBUs. Refer to Note 14, “Stock Incentive Plans”, for further information

Restructuring and Repositioning

Restructuring and Repositioning Expenses, Asset Write Offs	6 Months Ended
	Jun. 30, 2021
Restructuring and Related Activities [Abstract]
Restructuring and Repositioning Expenses, Asset Write Offs	Restructuring and Repositioning Expenses, Asset Write Offs GCP's Board approves all major restructuring and repositioning programs. Major restructuring programs may involve reorganizations, the discontinuation of significant product lines, the shutdown of significant facilities, or other major strategic initiatives. From time to time, GCP takes additional restructuring actions, including involuntary employee terminations that are not a part of a major program. Repositioning activities generally represent major strategic or transformational actions to enhance the value and performance of the Company, improve business efficiency or optimize the Company’s footprint. Repositioning expenses associated with the Plans discussed below, as well as a review of strategic, financial and operational alternatives, are primarily related to consulting, professional services, and other employee-related costs associated with the Company’s organizational realignment and advancing its technology strategy. Due to the scope and complexity of the Company’s repositioning activities, the range of estimated repositioning expenses and capital expenditures could increase or decrease and the timing of incurrence could change. 2021 Restructuring and Repositioning Plan (the “2021 Plan”) On March 30, 2021, the Board approved a business restructuring and repositioning plan (the “2021 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 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 30, 2022. 2019 Restructuring and Repositioning Plan (the “2019 Plan”) On February 22, 2019, the Board approved a business restructuring and repositioning plan (the “2019 Plan”). The 2019 Plan is focused on GCP’s global supply chain strategy, processes and execution, including its manufacturing, purchasing, logistics, and warehousing operations. The plan also addresses GCP’s service delivery model, primarily in North America, to streamline the Company’s pursuit of combined admixture and VERIFI ® opportunities. The program was substantially completed as of December 31, 2020. 2019 Phase 2 Restructuring and Repositioning Plan (the “2019 Phase 2 Plan") On July 31, 2019, the Board approved a business restructuring and repositioning plan to further optimize the design and footprint of the Company's global organization, primarily with respect to its general administration and business support functions, and streamline cross-functional activities (the “2019 Phase 2 Plan”). The 2019 Phase 2 Plan is expected to result in the net reduction of approximately 8%-10% of the Company's workforce. The program was substantially completed as of March 31, 2021. Please refer to Note 14, " Restructuring and Repositioning Expenses, Asset Write Offs" to the Company's Consolidated Financial Statements included in the 2020 Annual Report in the Form 10-K for further information on additional restructuring and repositioning programs not described above. The following table illustrates a summary of the charges incurred and planned in connection with restructuring and repositioning plans discussed above: (In millions) Severance/employee costs Asset Write Offs Other Associated Costs Total Restructuring Repositioning Total Costs Capital Expenditures 2021 Plan: (1) Estimated Total Costs $11-13 $8-9 $5 $24-27 $2 $26-29 $6 Cumulative Costs incurred to Date $9.8 $2.4 $1.1 $13.3 $0.5 $13.8 $— 2019 Plan: (2) Cumulative Costs incurred to Date $0.9 $0.9 $0.3 $2.1 $10.5 $12.6 $2.3 2019 Phase 2 Plan: (3) Cumulative Costs incurred to Date $25.9 $0.6 $— $26.5 $7.3 $33.8 $0.4 (1) As of June 30, 2021, the cumulative restructuring costs incurred under the 2021 Plan since its inception were $13.3 million, of which $5.9 million was related to the SCC segment, $3.7 million was related to the SBM segment, and $3.7 million was attributable to the corporate functions. (2) As of June 30, 2021, the cumulative restructuring costs incurred under the 2019 Plan since its inception were $2.1 million, of which $1.7 million was related to the SCC segment and $0.4 million was related to the SBM segment. (3) As of June 30, 2021, the cumulative restructuring costs recognized under the 2019 Phase 2 Plan since its inception were $26.5 million, of which $7.1 million was attributable to the SCC segment, $7.0 million was attributable to the SBM segment, and $12.4 million was attributable to the corporate functions. The following tables represent the repositioning expenses incurred and cash payments made under the Plans discussed above and other plans during each period: Three Months Ended June 30, 2021 (In millions) 2021 Plan 2019 Plan 2019 Plan Phase 2 Total Repositioning Expenses $ 0.5 $ — $ — $ 0.5 Cash Paid for Repositioning Expenses 0.3 — 0.6 0.9 Capital Expenditures — 0.1 — $ 0.1 Cash Paid for Capital Expenditures — 0.1 — 0.1 Six Months Ended June 30, 2021 (In millions) 2021 Plan 2019 Plan 2019 Plan Phase 2 Total Repositioning Expenses $ 0.5 $ — $ 1.3 $ 1.8 Cash Paid for Repositioning Expenses 0.3 — 2.0 2.3 Capital Expenditures — 0.2 — $ 0.2 Cash Paid for Capital Expenditures — 0.2 — 0.2 Three Months Ended June 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 0.2 $ 0.7 $ — $ 0.1 $ — $ 1.0 Cash Paid for Repositioning Expenses 1.2 1.3 0.8 — 0.2 3.5 Capital Expenditures 0.5 0.2 — 0.2 0.7 1.6 Cash Paid for Capital Expenditures 0.5 0.1 — 0.3 0.6 1.5 Six Months Ended June 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 1.6 $ 1.9 $ — $ 0.1 $ 0.1 $ 3.7 Cash Paid for Repositioning Expenses 4.5 2.8 1.0 — 0.2 8.5 Capital Expenditures 0.9 0.3 — 0.5 0.9 2.6 Cash Paid for Capital Expenditures 0.8 0.2 — 0.4 1.2 2.6 As of June 30, 2021 (In millions) 2021 Plan 2019 Plan 2019 Plan Phase 2 Cumulative Repositioning Expenses $ 0.5 $ 10.5 $ 7.3 Cumulative Cash Paid for Repositioning Expenses 0.3 10.5 7.1 Cumulative Capital Expenditure — 2.3 0.4 Cumulative Cash Paid for Capital Expenditures — 2.2 0.4 Restructuring Expenses and Asset Write Offs The following restructuring expenses and asset write offs were incurred under the Plans discussed above and other plans during each period: Three Months Ended June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 Severance and other employee costs $ 5.0 $ — $ 10.2 $ 1.9 Asset write offs 0.5 0.2 2.7 1.2 Other associated costs 1.0 0.2 1.2 0.4 Total restructuring expenses and asset write offs $ 6.5 $ 0.4 $ 14.1 $ 3.5 GCP incurred restructuring expenses and asset write offs related to its two operating segments and corporate functions as follows: Three Months Ended June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 SCC $ 3.1 $ 0.3 $ 6.0 $ 2.6 SBM 1.9 0.1 3.7 0.9 Corporate 1.5 — 4.4 — Total restructuring expenses and asset write offs from continuing operations $ 6.5 $ 0.4 $ 14.1 $ 3.5 Restructuring liabilities were $16.1 million and $18.0 million, respectively, as of June 30, 2021 and December 31, 2020. These liabilities are included within “Other current liabilities” in the accompanying unaudited Consolidated Balance Sheets. The following table summarizes the Company’s restructuring liability activity: 2021 Plan 2019 Plan 2019 Phase 2 Plan 2018 Plan (In millions) Severance and other employee costs Other Costs Severance and other employee costs Other Costs Severance and other employee costs Severance and other employee costs Total Balance, December 31, 2020 $ — $ — $ 0.1 $ 0.1 $ 17.3 $ 0.5 $ 18.0 Expense (1)(2) 4.5 — — — 0.2 — 4.7 Payments (0.2) — — — (5.7) — (5.9) Impact of foreign currency and other — — — — (0.1) — (0.1) Balance, March 31, 2021 $ 4.3 $ — $ 0.1 $ 0.1 $ 11.7 $ 0.5 $ 16.7 Expense (1) 5.3 0.9 — — (0.1) (0.3) 5.8 Payments (1.8) (0.4) — — (4.1) (0.1) (6.4) Balance, June 30, 2021 $ 7.8 $ 0.5 $ 0.1 $ 0.1 $ 7.5 $ 0.1 $ 16.1 ________________________________ (1) Asset write offs of $0.4 million and $2.5 million attributable to the corporate functions during the three and six months ended June 30, 2021 are related to the 2021 Plan. Additionally, as part of the 2019 Phase 2 Plan, GCP incurred $0.1 million of asset write offs attributable to the SBM segment during the three months ended and $0.1 million of asset write off attributable to the SCC segment during the six months ended June 30, 2021. These asset write offs are recorded with a corresponding reduction to "Properties and equipment, net" in the accompanying unaudited Consolidated Balance Sheets. These expenses are not recorded with a corresponding adjustment to the restructuring liability and therefore, are not included in the table above.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following tables present the pre-tax, tax benefit (expense), and after-tax components of GCP's other comprehensive loss for the three and six months ended June 30, 2021 and 2020: Three Months Ended June 30, 2021 (In millions) Pre-Tax Amount Tax Benefit After-Tax Amount Defined benefit pension and other postretirement plans $ 0.1 $ — $ 0.1 Currency translation adjustments (1) 4.8 0.1 4.9 Other comprehensive income attributable to GCP shareholders $ 4.9 $ 0.1 $ 5.0 Six Months Ended June 30, 2021 (In millions) Pre-Tax Amount Tax Expense After-Tax Amount Defined benefit pension and other postretirement plans $ 0.1 $ — $ 0.1 Currency translation adjustments (1) (2.8) (0.3) (3.1) Other comprehensive loss attributable to GCP shareholders $ (2.7) $ (0.3) $ (3.0) Three Months Ended June 30, 2020 (In millions) Pre-Tax Amount Tax Benefit After-Tax Amount Currency translation adjustments (1) $ 4.7 $ 0.2 $ 4.9 Loss from hedging activities (0.1) — (0.1) Other comprehensive income attributable to GCP shareholders $ 4.6 $ 0.2 $ 4.8 Six Months Ended June 30, 2020 (In millions) Pre-Tax Amount Tax Expense After-Tax Amount Defined benefit pension and other postretirement plans $ 0.1 $ — $ 0.1 Currency translation adjustments (1) (28.7) (0.2) (28.9) Gain from hedging activities 0.1 — 0.1 Other comprehensive loss attributable to GCP shareholders $ (28.5) $ (0.2) $ (28.7) _____________________ (1) Currency translation adjustments related to the net investment hedge are presented net of income taxes, as discussed in Note 4, "Derivative Instruments." The following tables present the changes in accumulated other comprehensive loss, net of tax, for the six months ended June 30, 2021 and 2020: (In millions) Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments Hedging Activities Total Balance, December 31, 2020 $ (3.1) $ (107.4) $ — $ (110.5) Other comprehensive income (loss) before reclassifications 0.1 (3.1) 0.1 (2.9) Amounts reclassified from accumulated other comprehensive loss — — (0.1) (0.1) Current-period other comprehensive income (loss) 0.1 (3.1) — (3.0) Balance, June 30, 2021 $ (3.0) $ (110.5) $ — $ (113.5) (In millions) Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments Hedging Activities Total Balance, December 31, 2019 $ (2.7) $ (114.2) $ (0.1) $ (117.0) Current period other comprehensive income (loss) 0.1 (28.9) 0.1 $ (28.7) Balance, June 30, 2020 $ (2.6) $ (143.1) $ — $ (145.7) Please refer to Note 8, "Pension Plans and Other Postretirement Benefit Plans," for a discussion of pension plans and other postretirement benefit plans.

Stock Incentive Plans

Stock Incentive Plans	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock Incentive Plans	Stock Incentive Plans Stock-Based Compensation Accounting GCP grants restricted stock units ("RSUs"), as well as 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. Please refer to Note 17, "Stock Incentive Plans" to the Company's Consolidated Financial Statements included in the 2020 Annual Report in the Form 10-K for further information on these awards. Total stock-based compensation expense included in "Income from continuing operations before income taxes" in the accompanying unaudited Consolidated Statements of Operations was $1.8 million and $3.5 million, respectively, during the three and six months ended June 30, 2021 and $1.5 million and $2.3 million, respectively, during the three and six months ended June 30, 2020. During the three and six months ended June 30, 2021, $0.2 million and $0.9 million, respectively, of the stock-based compensation expense is included in "Restructuring expenses and asset write offs" related to accelerated vesting of stock options and RSUs and PBUs, as described in Note 12, "Restructuring and Repositioning Expenses, Asset Write Offs". 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 six months ended June 30, 2021 and 2020, GCP withheld and retained approximately 62,400 shares and 17,300 shares, respectively, in a non-cash transaction with a cost of $0.9 million and $0.3 million, respectively, which were reflected as "Share Repurchases" in the accompanying unaudited Consolidated Statements of Stockholders' Equity. During the six months ended June 30, 2021 and 2020, cash payments for such tax withholding obligations were $1.6 million and $0.3 million, respectively. As of June 30, 2021, total unrecognized compensation expense of $1.5 million was related to stock options with market conditions and $7.4 million related to the RSU and PBU awards. Such expense is expected to be recognized over the remaining weighted-average service period of approximately 2.3 years for stock options with market conditions and 2.0 years for RSU and PBU awards. Stock Options Approximately 252,000 options were exercised during the six months ended June 30, 2021 with a weighted average exercise price of $17.17. Total intrinsic value of these options was approximately $2.2 million. There were no options granted during the six months ended June 30, 2021. Restricted Stock Units The following table sets forth the RSU activity for the six months ended June 30, 2021: RSU Activity Number Of Weighted Outstanding, December 31, 2020 305 $ 22.14 Less: RSUs settled (174) 22.56 Less: RSUs forfeited (16) 23.70 RSUs granted 121 25.97 RSUs outstanding, June 30, 2021 236 $ 23.72 Expected to vest as of June 30, 2021 232 $ 23.70 The weighted average grant date fair value of RSUs granted during the three months ended June 30, 2021 was $25.99. There were no RSUs granted during the three months ended June 30, 2020. The weighted average grant date fair value of RSUs granted during the six months ended June 30, 2021 and 2020 was $25.97 and $21.11, respectively. During the six months ended June 30, 2021 and 2020, GCP distributed 174,000 shares and 48,000 shares, respectively, to settle RSUs upon vesting. The fair value of RSUs vested during the six months ended June 30, 2021 and 2020 was $4.4 million and $1.0 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. 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, two 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 six months ended June 30, 2021 and 2020: Six Months Ended June 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 six months ended June 30, 2021: PBU Activity Number Of Weighted Outstanding, December 31, 2020 343 $ 28.10 Less: PBU's forfeited (161) 30.89 PBU's granted 92 27.28 Outstanding, June 30, 2021 274 $ 26.15

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 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 June 30, Six Months Ended June 30, (In millions, except per share amounts) 2021 2020 2021 2020 Numerators Income (loss) from continuing operations attributable to GCP shareholders $ 10.4 $ (0.7) $ 11.9 $ 1.3 Loss from discontinued operations, net of income taxes (0.2) — (0.2) (0.3) Net income (loss) attributable to GCP shareholders $ 10.2 $ (0.7) $ 11.7 $ 1.0 Denominators Weighted average common shares—basic calculation 73.4 72.9 73.2 72.9 Dilutive effect of employee stock awards (2) 0.1 — 0.2 0.1 Weighted average common shares—diluted calculation 73.5 72.9 73.4 73.0 Basic earnings (loss) per share: (2) Income (loss) from continuing operations attributable to GCP shareholders $ 0.14 $ (0.01) $ 0.16 $ 0.02 Loss from discontinued operations, net of income taxes $ — $ — $ — $ — Net income (loss) attributable to GCP shareholders (1) $ 0.14 $ (0.01) $ 0.16 $ 0.01 Diluted earnings (loss) per share: (2) Income (loss) from continuing operations attributable to GCP shareholders $ 0.14 $ (0.01) $ 0.16 $ 0.02 Loss from discontinued operations, net of income taxes $ — $ — $ — $ — Net income (loss) attributable to GCP shareholders (1) $ 0.14 $ (0.01) $ 0.16 $ 0.01 ________________________________ (1) Amounts may not sum due to rounding. (2) Dilutive effect is only applicable to the periods during which GCP generated net income from continuing operations. GCP uses the treasury stock method to compute diluted earnings (loss) per share. During the three and six months ended June 30, 2021, 0.6 million of such anti-dilutive stock awards were excluded from the computation of diluted earnings per share. During the three and six months ended June 30, 2020, 0.9 million and 0.8 million, respectively, of anti-dilutive stock awards were excluded from the computation of diluted earnings per share.

Related Party Transactions and

Related Party Transactions and Transactions with Grace	6 Months Ended
	Jun. 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 In connection with the Separation, the Company and Grace entered into a Tax Sharing Agreement which governs the parties’ respective rights, responsibilities and obligations with respect to tax liabilities and benefits, tax attributes, the preparation and filing of tax returns, the control of audits and other tax proceedings, as well as other matters regarding taxes. In general, and subject to the terms of the Tax Sharing Agreement, GCP is responsible for all U.S. federal, state and foreign taxes including any related interest, penalties or audit adjustments reportable on a GCP separate return (a return that does not include Grace or any of its subsidiaries). Grace is responsible for all U.S. federal, state and foreign income taxes including any related interest, penalties or audit adjustments reportable on a consolidated, combined or unitary return that includes Grace or any of its subsidiaries and GCP or any of its subsidiaries up to the Separation date. As of June 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 accompanying unaudited Consolidated Balance Sheets.

Operating Segment and Geographi

Operating Segment and Geographic Information	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Operating Segment and Geographic Information	Operating Segment and Geographic Information GCP is engaged in the production and sale of specialty construction chemicals and specialty building materials through two operating segments. Specialty Construction Chemicals ("SCC") operating segment provides products, services and technologies to the concrete and cement industries, including concrete add-mixtures 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. Operating Segment Data The following table presents information related to GCP's operating segments: Three Months Ended June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 Net Sales Specialty Construction Chemicals $ 144.6 $ 115.9 $ 268.5 $ 241.3 Specialty Building Materials 108.8 79.5 207.7 170.8 Total net sales $ 253.4 $ 195.4 $ 476.2 $ 412.1 Segment Operating Income Specialty Construction Chemicals $ 15.3 $ 10.0 $ 21.4 $ 18.5 Specialty Building Materials 19.9 11.6 39.3 25.7 Total segment operating income $ 35.2 $ 21.6 $ 60.7 $ 44.2 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 six months ended June 30, 2021 and 2020 is reconciled below to "Income from continuing operations before income taxes" presented in the accompanying unaudited Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 Total segment operating income (1) $ 35.2 $ 21.6 $ 60.7 $ 44.2 Corporate costs (6.8) (6.3) (14.0) (12.2) Certain pension costs (1.5) (1.3) (2.9) (2.6) Shareholder activism and other related costs (2) — (3.8) — (7.4) Repositioning expenses (0.5) (1.0) (1.8) (3.7) Restructuring expenses and asset write offs (6.5) (0.4) (14.1) (3.5) Third-party and other acquisition-related costs (0.4) (0.2) (0.5) (0.7) Gain on Brazil tax recoveries 3.3 — 3.3 — Net income attributable to noncontrolling interests 0.1 0.1 0.2 0.2 Interest expense, net (5.4) (4.7) (10.8) (9.8) Income from continuing operations before income taxes $ 17.5 $ 4.0 $ 20.1 $ 4.5 __________________________ (1) Certain amounts related to COVID-19 costs have been reclassified between segments' operating income and corporate expenses that do not get allocated directly to the segments. Such reclassifications have not materially affected previously reported amounts. (2) Shareholder activism and other related costs consist primarily of professional fees incurred in connection with the actions by certain of GCP shareholders seeking changes in the composition of the Company's Board of Directors and nomination of candidates to stand for election at the 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 June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 Net Sales United States $ 123.9 $ 106.3 $ 236.0 $ 219.3 Canada and Other 8.2 6.0 14.2 12.2 Total North America 132.1 112.3 250.2 231.5 Europe Middle East Africa 54.1 34.6 98.7 78.9 Asia Pacific 52.6 39.7 99.3 80.0 Latin America 14.6 8.8 28.0 21.7 Total $ 253.4 $ 195.4 $ 476.2 $ 412.1

Revisions of Previously Issued

Revisions of Previously Issued Consolidated Financial Statements	6 Months Ended
	Jun. 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 as of and for the three and six months ended June 30, 2020. GCP Applied Technologies Inc. Consolidated Statements of Operations (unaudited) Three Months Ended June 30, 2020 (In millions, except per share amounts) As Previously Reported Adjustments As Revised Net sales $ 195.4 $ — $ 195.4 Cost of goods sold 119.0 (1.0) 118.0 Gross profit 76.4 1.0 77.4 Selling, general and administrative expenses 65.7 0.3 66.0 Research and development expenses 3.7 — 3.7 Interest expense and related financing costs 5.0 — 5.0 Repositioning expenses 1.0 — 1.0 Restructuring expenses and asset write offs 0.4 — 0.4 Other income, net (2.7) — (2.7) Total costs and expenses 73.1 0.3 73.4 Income from continuing operations before income taxes 3.3 0.7 4.0 Provision for income taxes (4.5) (0.1) (4.6) (Loss) income from continuing operations (1.2) 0.6 (0.6) Income from discontinued operations, net of income taxes — — — Net (loss) income (1.2) 0.6 (0.6) Less: Net income attributable to non-controlling interests (0.1) — (0.1) Net (loss) income attributable to GCP shareholders $ (1.3) $ 0.6 $ (0.7) Amounts Attributable to GCP Shareholders: Net (loss) income from continuing operations attributable to GCP shareholders (1.3) 0.6 $ (0.7) Loss from discontinued operations, net of income taxes — — — Net (loss) income attributable to GCP shareholders $ (1.3) $ 0.6 $ (0.7) Earnings (Loss) Per Share Attributable to GCP Shareholders Basic earnings (loss) per share: Net (loss) income from continuing operations attributable to GCP shareholders $ (0.02) $ 0.01 $ (0.01) Loss from discontinued operations, net of income taxes $ — $ — Net (loss) income attributable to GCP shareholders (1) $ (0.02) $ 0.01 $ (0.01) Weighted average number of basic shares 72.9 72.9 Diluted earnings (loss) per share: (Loss) income from continuing operations attributable to GCP shareholders $ (0.02) $ 0.01 $ (0.01) Loss from discontinued operations, net of income taxes $ — $ — Net (loss) income attributable to GCP shareholders (1) $ (0.02) $ 0.01 $ (0.01) Weighted average number of diluted shares 72.9 72.9 (1) Amounts may not sum due to rounding. Six Months Ended June 30, 2020 (In millions, except per share amounts) As Previously Reported Adjustments As Revised Net sales $ 412.1 $ — $ 412.1 Cost of goods sold 253.8 (1.9) 251.9 Gross profit 158.3 1.9 160.2 Selling, general and administrative expenses 133.8 0.3 134.1 Research and development expenses 8.6 — 8.6 Interest expense and related financing costs 10.7 — 10.7 Repositioning expenses 3.7 — 3.7 Restructuring expenses and asset write offs 3.5 — 3.5 Other income, net (4.9) — (4.9) Total costs and expenses 155.4 0.3 155.7 Income from continuing operations before income taxes 2.9 1.6 4.5 Provision for income taxes (2.6) (0.4) (3.0) Income from continuing operations 0.3 1.2 1.5 Loss from discontinued operations, net of income taxes (0.3) — (0.3) Net income — 1.2 1.2 Less: Net loss attributable to non-controlling interests (0.2) — (0.2) Net (loss) income attributable to GCP shareholders $ (0.2) $ 1.2 $ 1.0 Amounts Attributable to GCP Shareholders: Income from continuing operations attributable to GCP shareholders 0.1 $ 1.2 $ 1.3 Loss from discontinued operations, net of income taxes (0.3) — (0.3) Net (loss) income attributable to GCP shareholders $ (0.2) $ 1.2 $ 1.0 Earnings (Loss) Per Share Attributable to GCP Shareholders Basic earnings (loss) per share: Income from continuing operations attributable to GCP shareholders $ — $ 0.02 $ 0.02 Loss from discontinued operations, net of income taxes $ — $ — $ — Net income attributable to GCP shareholders (1) $ — $ 0.01 $ 0.01 Weighted average number of basic shares 72.9 — 72.9 Diluted earnings (loss) per share: Income from continuing operations attributable to GCP shareholders $ — $ 0.02 $ 0.02 Loss from discontinued operations, net of income taxes $ — $ — $ — Net income attributable to GCP shareholders (1) $ — $ 0.01 $ 0.01 Weighted average number of diluted shares 73.0 — 73.0 (1) Amounts may not sum due to rounding GCP Applied Technologies Inc. Consolidated Statements of Comprehensive Income (unaudited) Three Months Ended June 30, 2020 (In millions) As Previously Reported Adjustments As Revised Net (loss) income $ (1.2) $ 0.6 $ (0.6) Other comprehensive income: Currency translation adjustments, net of income taxes 4.9 — 4.9 Loss from hedging activities, net of income taxes (0.1) — (0.1) Total other comprehensive income 4.8 — 4.8 Comprehensive income 3.6 0.6 4.2 Less: Comprehensive loss attributable to noncontrolling interests (0.1) — (0.1) Comprehensive income attributable to GCP shareholders $ 3.5 $ 0.6 $ 4.1 Six Months Ended June 30, 2020 (In millions) As Previously Reported Adjustments As Revised Net income $ — $ 1.2 $ 1.2 Other comprehensive loss: Defined benefit pension and other postretirement plans, net of income taxes 0.1 — 0.1 Currency translation adjustments, net of income taxes (28.9) — (28.9) Gain from hedging activities, net of income taxes 0.1 — 0.1 Total other comprehensive loss (28.7) — (28.7) Comprehensive loss (28.7) 1.2 (27.5) Less: Comprehensive loss attributable to noncontrolling interests (0.2) — (0.2) Comprehensive income (loss) attributable to GCP shareholders $ (28.9) $ 1.2 $ (27.7) GCP Applied Technologies Inc. Consolidated Statements of Stockholders' Equity (unaudited) (In millions) As Previously Reported Adjustments As Revised Total Stockholders' Equity: Balance, December 31, 2019 $ 541.1 $ (0.1) $ 541.0 Net income — 1.2 1.2 Share-based compensation 2.8 — 2.8 Exercise of stock options 0.7 — 0.7 Share repurchases (0.3) — (0.3) Dividends and other changes in non-controlling interest (0.4) — (0.4) Other comprehensive loss (28.7) — (28.7) Balance, June 30, 2020 $ 515.2 $ 1.1 $ 516.3 GCP Applied Technologies Inc. Consolidated Statements of Cash Flows (unaudited) Six Months Ended June 30, 2020 (In millions) As Previously Reported Adjustments As Revised OPERATING ACTIVITIES Net income $ — $ 1.2 $ 1.2 Less: Loss from discontinued operations (0.3) — (0.3) Income from continuing operations 0.3 1.2 1.5 Reconciliation to net cash provided by operating activities: Depreciation and amortization 22.7 — 22.7 Amortization of debt discount and financing costs 0.7 — 0.7 Stock-based compensation expense 2.3 — 2.3 Unrealized loss on foreign currency 1.6 — 1.6 Deferred income taxes (5.8) 0.4 (5.4) Loss on disposal of property and equipment 0.1 — 0.1 Changes in assets and liabilities, excluding effect of currency translation: Trade accounts receivable 30.3 — 30.3 Inventories (5.1) — (5.1) Accounts payable (13.5) — (13.5) Pension assets and liabilities, net 1.6 — 1.6 Other assets and liabilities, net (15.3) (1.6) (16.9) Net cash provided by operating activities from continuing operations 19.9 — 19.9 Net cash used in operating activities from discontinued operations (2.3) — (2.3) Net cash provided by operating activities 17.6 — 17.6 INVESTING ACTIVITIES Capital expenditures (18.8) — (18.8) Other investing activities 0.4 — 0.4 Net cash used in investing activities (18.4) — (18.4) FINANCING ACTIVITIES Payments on finance lease obligations (0.4) — (0.4) Payments of tax withholding obligations related to employee equity awards (0.3) — (0.3) Proceeds from exercise of stock options 0.7 — 0.7 Payments of dividends to noncontrolling interests (0.4) — (0.4) Net cash used in financing activities from continuing operations (0.4) — (0.4) Effect of currency exchange rate changes on cash and cash equivalents (5.6) — (5.6) Decrease in cash and cash equivalents (6.8) — (6.8) Cash and cash equivalents, beginning of period 325.0 — 325.0 Cash and cash equivalents, end of period $ 318.2 $ — $ 318.2 Supplemental disclosure of non-cash investing activities: Property and equipment purchases unpaid and included in accounts payable $ 5.3 $ — $ 5.3

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Consolidated Financial Statements are presented on a consolidated basis and include all of the accounts and operations of GCP and its majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The financial statements reflect the financial position, results of operations and cash flows of GCP in accordance with generally accepted accounting principles in the United States ("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 Consolidated Balance Sheet as of 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 six months ended June 30, 2021 are not necessarily indicative of the results of operations for the year ending December 31, 2021.
Revisions of Previously Issued Consolidated Financial Statements	Revisions of Previously Issued 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 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 consolidated financial statements were materially misstated. The Company concluded the errors were not material individually or in the aggregate to the previously issued consolidated financial statements. In accordance with ASC 250-10-S99-2, the Company has corrected these errors by revising previously filed unaudited quarterly consolidated financial statements for the three and six months ended June 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 consolidated financial statements for the three and six months ended June 30, 2020. Please refer to Note 18, “Revisions of Previously Issued 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 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 the evolving COVID-19 pandemic on the global economy, the Company's business, financial position and results of operations. GCP has made certain estimates within its financial statements related to the impact of COVID-19, including allowances for credit losses related to the estimated amount of receivables not expected to be collected and excess, obsolete or damaged inventories, future expected cash flows related to impairment assessments of goodwill and long-lived assets, incentive compensation accruals, contingent liabilities, and sales allowances related to volume rebates recognized based on anticipated sales volume. There may be changes to the Company's estimates in future periods due to uncertainty associated with the impact of COVID-19, the extent of which will depend largely on future developments, including new information which may emerge concerning the resurgence of the COVID-19 pandemic, as well as additional and unanticipated actions by government authorities to further contain the spread of COVID-19, which may result in extended ongoing business disruptions.
Income Tax	Income Tax
Reclassifications	ReclassificationsCertain amounts in prior period financial statements have been reclassified to conform to the current period presentation. Such reclassifications have not materially affected previously reported amounts.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board ("FASB") amended Accounting Standards Codification ("ASC") 740, Income Taxes (issued under Accounting Standards Update ("ASU") 2019-12, Simplifying the Accounting for Income Taxes ). This amendment removes certain exceptions to the general principles of ASC 740, and clarifies and amends the existing guidance to improve consistent application. GCP adopted the guidance effective January 1, 2021. The adoption did not have a material impact on its results of operations, financial position and cash flows.

Inventories, net (Tables)

Inventories, net (Tables)	6 Months Ended
	Jun. 30, 2021
Inventory Disclosure [Abstract]
Schedule of Inventories	The following is a summary of inventories presented in the accompanying unaudited Consolidated Balance Sheets at June 30, 2021 and December 31, 2020: (In millions) June 30, December 31, Raw materials $ 58.4 $ 41.3 In process 5.1 4.2 Finished products and other 64.8 52.9 Total inventories, net $ 128.3 $ 98.4

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 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 as of June 30, 2021 and December 31, 2020: (In millions) June 30, 2021 December 31, 2020 Derivative assets (1) : Foreign exchange forward contracts $ 0.6 $ — Derivative liability (1) : Foreign exchange forward contracts $ (0.8) $ (1.8) __________________________ (1) The fair value of derivative instruments is measured based on expected future cash flows discounted at market interest rates using observable market inputs and classified as Level 2 within the fair value hierarchy. As of June 30, 2021, fair value of derivative assets of $0.3 million and $0.3 million, respectively, is recorded within "Other current assets" and "Other assets" in the accompanying unaudited Consolidated Balance Sheets, and fair value of derivative liability of $0.8 million is recorded within "Other Liabilities" in the accompanying unaudited Consolidated Balance Sheets. As of December 31, 2020, fair value of derivative liabilities of $0.4 million and $1.4 million, respectively, is recorded within "Other current liabilities" and "Other liabilities" in the accompanying unaudited Consolidated Balance Sheets.
Net Investment Hedges in Consolidated Statements of Operations and Comprehensive Loss	The following table summarizes the amounts recorded in the Company's accompanying unaudited Consolidated Statements of Operations and Consolidated Statements of Comprehensive Loss related to forward contracts designated as net investment hedges for the three and six months ended June 30, 2021 and 2020: Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 (In millions) Other Income, net Cumulative Translation Adjustments (1) Other Income, net Cumulative Translation Adjustments (1) Gains (losses) on foreign exchange forward contracts $ 0.2 $ (0.5) $ 0.2 $ (0.8) Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 (In millions) Other Income, net Cumulative Translation Adjustments (1) Other Income, net Cumulative Translation Adjustments (1) Gains on foreign exchange forward contracts $ 0.4 $ 0.9 $ 0.5 $ 0.5 (1) The amount is presented net of tax benefit (expense) of $0.1 million and ($0.3) million, respectively, for the three and six months ended June 30, 2021. The amount is presented net of tax benefit (expense) of $0.2 million and ($0.2) million, respectively, for the three and six months ended June 30, 2020.

Debt and Other Borrowings (Tabl

Debt and Other Borrowings (Tables)	6 Months Ended
	Jun. 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 June 30, 2021 and December 31, 2020: (In millions) June 30, December 31, 5.5% Senior Notes due in 2026, net of unamortized debt issuance costs of $3.1 million and $3.3 million, respectively, at June 30, 2021 and December 31, 2020 $ 346.9 $ 346.6 Revolving credit facility due 2023 (1) — — Other borrowings (2) 4.4 5.1 Total debt 351.3 351.7 Less: debt payable within one year 2.4 2.8 Debt payable after one year $ 348.9 $ 348.9 Weighted average interest rates on total debt obligations 5.5 % 5.5 % __________________________ (1) Represents borrowings under the Revolving Credit Facility with an aggregate available principal amount of $350.0 million as of June 30, 2021 and December 31, 2020. (2) Represents borrowings of $1.7 million and $2.1 million, respectively, at June 30, 2021 and December 31, 2020, under various lines of credit and other borrowings, primarily by non-U.S. subsidiaries, with a combined maximum borrowing amount of $45.1 million, as well as $2.7 million and $3.0 million, respectively, of finance lease obligations.
Principal Maturities of Debt and Finance Lease Obligations Outstanding	The principal maturities of debt obligations outstanding, net of debt issuance costs, were as follows at June 30, 2021: (In millions) Amount Remainder of 2021 $ 2.1 2022 0.8 2023 0.7 2024 0.7 2025 0.1 Thereafter 346.9 Total debt $ 351.3
Carrying Amounts and Fair Values of Debt Instruments	The carrying amount and fair value of GCP's debt and other borrowings were as follows: June 30, 2021 December 31, 2020 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value 5.5% Senior Notes due in 2026 $ 346.9 $ 361.3 $ 346.6 $ 362.0 Other borrowings 4.4 4.4 5.1 5.1 Total debt $ 351.3 $ 365.7 $ 351.7 $ 367.1

Lessee Arrangements (Tables)

Lessee Arrangements (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Lease Expense	The following table summarizes components of lease expense for the three and six months ended June 30, 2021 and 2020: Three months ended June 30, Six months ended June 30, (In millions) 2021 2020 2021 2020 Operating lease expense $ 4.1 $ 3.0 $ 8.4 $ 6.2 Variable lease expense 1.5 1.3 2.5 2.4 Short-term lease expense 0.5 0.8 1.2 1.4 Total lease expense $ 6.1 $ 5.1 $ 12.1 $ 10.0 The following table summarizes supplemental cash flow information related to leases during the six months ended June 30, 2021 and 2020: Six months ended June 30, (In millions) 2021 2020 Cash paid for operating lease liabilities, classified as operating cash flows $ 5.3 $ 6.2 Operating lease right of use assets obtained in exchange for new lease obligations 2.3 11.8

Pension Plans and Other Postr_2

Pension Plans and Other Postretirement Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2021
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Net Funded Status of Over-Funded, Underfunded, and Unfunded Pension Plans	The following table presents the funded status of GCP's overfunded, underfunded and unfunded defined pension plans: (In millions) June 30, 2021 December 31, 2020 Overfunded defined benefit pension plans $ 30.4 $ 29.7 Underfunded defined benefit pension plans (35.5) (33.3) Unfunded defined benefit pension plans (28.9) (29.6) Total underfunded and unfunded defined benefit pension plans (64.4) (62.9) Pension liabilities included in other current liabilities (1.3) (1.4) Net funded status $ (35.3) $ (34.6)
Components of Net Periodic Benefit Cost (Income)	Components of Net Periodic Benefit Cost The components of GCP's net periodic benefit cost for the three and six months ended June 30, 2021 and 2020 are as follows: Three Months Ended June 30, 2021 2020 Pension Pension (In millions) U.S. Non-U.S. Total U.S. Non-U.S. Total Service cost $ 1.6 $ 0.2 $ 1.8 $ 1.6 $ 0.2 $ 1.8 Interest cost 1.2 0.7 1.9 1.2 1.0 2.2 Expected return on plan assets (1.6) (0.7) (2.3) (1.7) (1.1) (2.8) Amortization of prior service cost — 0.1 0.1 — 0.1 0.1 Net periodic benefit cost (1) $ 1.2 $ 0.3 $ 1.5 $ 1.1 $ 0.2 $ 1.3 Six Months Ended June 30, 2021 2020 Pension Pension (In millions) U.S. Non-U.S. Total U.S. Non-U.S. Total Service cost $ 3.1 $ 0.5 $ 3.6 $ 3.1 $ 0.4 $ 3.5 Interest cost 2.4 1.4 3.8 2.5 2.1 4.6 Expected return on plan assets (3.1) (1.5) (4.6) (3.3) (2.3) (5.6) Amortization of prior service cost — 0.1 0.1 — 0.1 0.1 Net periodic benefit cost (1) $ 2.4 $ 0.5 $ 2.9 $ 2.3 $ 0.3 $ 2.6 ________________________________ (1) Service cost component of net periodic benefit cost is included in "Selling, general and administrative expenses" and "Cost of goods sold" in the accompanying unaudited Consolidated Statements of Operations. All other components of net periodic benefit costs are presented in "Other income, net," within the accompanying unaudited Consolidated Statements of Operations.

Other Balance Sheet Informati_2

Other Balance Sheet Information (Tables)	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Other Current Assets	The following is a summary of other current assets at June 30, 2021 and December 31, 2020: (In millions) June 30, December 31, Other Current Assets: Non-trade receivables $ 21.4 $ 20.4 Prepaid expenses and other current assets 16.9 11.1 Income taxes receivable 8.0 9.7 Total other current assets $ 46.3 $ 41.2
Schedule of Other Current Liabilities	The following is a summary of other current liabilities at June 30, 2021 and December 31, 2020: (In millions) June 30, December 31, Other Current Liabilities: Accrued customer volume rebates $ 18.5 $ 24.4 Accrued compensation (1) 23.1 25.0 Income taxes payable 7.9 7.1 Accrued interest 4.0 4.0 Pension liabilities 1.3 1.4 Restructuring liability 16.1 18.0 Other accrued liabilities 45.8 45.9 Total other current liabilities $ 116.7 $ 125.8 ________________________________ (1) Accrued compensation presented in the table above includes salaries and wages, as well as estimated amounts due under the annual employee incentive programs.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Schedule of Stockholders' Equity	The following table summarizes the Company’s stockholders' equity activity during the three months ended June 30, 2021 and 2020. Common Stock Treasury Stock (In millions) Number of Shares (2) Par Value Number of Shares (2) Cost Additional Paid-in Capital Accumulated Earnings Accumulated Other Comprehensive Loss Non-Controlling Interests Total Stockholders' Equity Balance, March 31, 2020 73.3 $ 0.7 0.4 $ (8.9) $ 54.3 $ 611.8 $ (150.5) $ 2.5 $ 509.9 Net (loss) income — — — — — (0.7) — 0.1 (0.6) Share-based compensation — — — — 2.3 — — — 2.3 Exercise of stock options (2) — — — — 0.3 — — — 0.3 Other comprehensive income — — — — — — 4.8 — 4.8 Dividends and other changes in noncontrolling interest — — — — — — — (0.4) (0.4) Balance, June 30, 2020 73.3 $ 0.7 0.4 $ (8.9) $ 56.9 $ 611.1 $ (145.7) $ 2.2 $ 516.3 Balance, March 31, 2021 73.7 $ 0.7 0.5 $ (11.4) $ 65.5 $ 711.8 $ (118.5) $ 2.5 $ 650.6 Net income — — — — — 10.2 — 0.1 10.3 Issuance of common stock in connection with stock plans (2) 0.1 — — — — — — — — Share-based compensation — — — — 2.6 — — — 2.6 Exercise of stock options (2) 0.2 — — — 2.1 — — — 2.1 Share repurchases (1) — — — (0.9) — — — — (0.9) Other comprehensive income — — — — — — 5.0 — 5.0 Balance, June 30, 2021 74.0 $ 0.7 0.5 $ (12.3) $ 70.2 $ 722.0 $ (113.5) $ 2.6 $ 669.7 .________________________________ (1) Relates to shares withheld for tax payments on exercise of stock options and vesting of RSUs and PBUs. Refer to Note 14, “Stock Incentive Plans”, for further information

Restructuring and Repositioni_2

Restructuring and Repositioning Expenses, Asset Write Offs (Tables)	6 Months Ended
	Jun. 30, 2021
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Expenses	The following table illustrates a summary of the charges incurred and planned in connection with restructuring and repositioning plans discussed above: (In millions) Severance/employee costs Asset Write Offs Other Associated Costs Total Restructuring Repositioning Total Costs Capital Expenditures 2021 Plan: (1) Estimated Total Costs $11-13 $8-9 $5 $24-27 $2 $26-29 $6 Cumulative Costs incurred to Date $9.8 $2.4 $1.1 $13.3 $0.5 $13.8 $— 2019 Plan: (2) Cumulative Costs incurred to Date $0.9 $0.9 $0.3 $2.1 $10.5 $12.6 $2.3 2019 Phase 2 Plan: (3) Cumulative Costs incurred to Date $25.9 $0.6 $— $26.5 $7.3 $33.8 $0.4 (1) As of June 30, 2021, the cumulative restructuring costs incurred under the 2021 Plan since its inception were $13.3 million, of which $5.9 million was related to the SCC segment, $3.7 million was related to the SBM segment, and $3.7 million was attributable to the corporate functions. (2) As of June 30, 2021, the cumulative restructuring costs incurred under the 2019 Plan since its inception were $2.1 million, of which $1.7 million was related to the SCC segment and $0.4 million was related to the SBM segment. (3) As of June 30, 2021, the cumulative restructuring costs recognized under the 2019 Phase 2 Plan since its inception were $26.5 million, of which $7.1 million was attributable to the SCC segment, $7.0 million was attributable to the SBM segment, and $12.4 million was attributable to the corporate functions. The following tables represent the repositioning expenses incurred and cash payments made under the Plans discussed above and other plans during each period: Three Months Ended June 30, 2021 (In millions) 2021 Plan 2019 Plan 2019 Plan Phase 2 Total Repositioning Expenses $ 0.5 $ — $ — $ 0.5 Cash Paid for Repositioning Expenses 0.3 — 0.6 0.9 Capital Expenditures — 0.1 — $ 0.1 Cash Paid for Capital Expenditures — 0.1 — 0.1 Six Months Ended June 30, 2021 (In millions) 2021 Plan 2019 Plan 2019 Plan Phase 2 Total Repositioning Expenses $ 0.5 $ — $ 1.3 $ 1.8 Cash Paid for Repositioning Expenses 0.3 — 2.0 2.3 Capital Expenditures — 0.2 — $ 0.2 Cash Paid for Capital Expenditures — 0.2 — 0.2 Three Months Ended June 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 0.2 $ 0.7 $ — $ 0.1 $ — $ 1.0 Cash Paid for Repositioning Expenses 1.2 1.3 0.8 — 0.2 3.5 Capital Expenditures 0.5 0.2 — 0.2 0.7 1.6 Cash Paid for Capital Expenditures 0.5 0.1 — 0.3 0.6 1.5 Six Months Ended June 30, 2020 (In millions) 2019 Plan 2019 Plan Phase 2 Strategic Alternatives Plan 2018 Plan 2017 Plan Total Repositioning Expenses $ 1.6 $ 1.9 $ — $ 0.1 $ 0.1 $ 3.7 Cash Paid for Repositioning Expenses 4.5 2.8 1.0 — 0.2 8.5 Capital Expenditures 0.9 0.3 — 0.5 0.9 2.6 Cash Paid for Capital Expenditures 0.8 0.2 — 0.4 1.2 2.6 As of June 30, 2021 (In millions) 2021 Plan 2019 Plan 2019 Plan Phase 2 Cumulative Repositioning Expenses $ 0.5 $ 10.5 $ 7.3 Cumulative Cash Paid for Repositioning Expenses 0.3 10.5 7.1 Cumulative Capital Expenditure — 2.3 0.4 Cumulative Cash Paid for Capital Expenditures — 2.2 0.4 The following restructuring expenses and asset write offs were incurred under the Plans discussed above and other plans during each period: Three Months Ended June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 Severance and other employee costs $ 5.0 $ — $ 10.2 $ 1.9 Asset write offs 0.5 0.2 2.7 1.2 Other associated costs 1.0 0.2 1.2 0.4 Total restructuring expenses and asset write offs $ 6.5 $ 0.4 $ 14.1 $ 3.5 GCP incurred restructuring expenses and asset write offs related to its two operating segments and corporate functions as follows: Three Months Ended June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 SCC $ 3.1 $ 0.3 $ 6.0 $ 2.6 SBM 1.9 0.1 3.7 0.9 Corporate 1.5 — 4.4 — Total restructuring expenses and asset write offs from continuing operations $ 6.5 $ 0.4 $ 14.1 $ 3.5
Schedule of Restructuring Liability	The following table summarizes the Company’s restructuring liability activity: 2021 Plan 2019 Plan 2019 Phase 2 Plan 2018 Plan (In millions) Severance and other employee costs Other Costs Severance and other employee costs Other Costs Severance and other employee costs Severance and other employee costs Total Balance, December 31, 2020 $ — $ — $ 0.1 $ 0.1 $ 17.3 $ 0.5 $ 18.0 Expense (1)(2) 4.5 — — — 0.2 — 4.7 Payments (0.2) — — — (5.7) — (5.9) Impact of foreign currency and other — — — — (0.1) — (0.1) Balance, March 31, 2021 $ 4.3 $ — $ 0.1 $ 0.1 $ 11.7 $ 0.5 $ 16.7 Expense (1) 5.3 0.9 — — (0.1) (0.3) 5.8 Payments (1.8) (0.4) — — (4.1) (0.1) (6.4) Balance, June 30, 2021 $ 7.8 $ 0.5 $ 0.1 $ 0.1 $ 7.5 $ 0.1 $ 16.1 ________________________________ (1) Asset write offs of $0.4 million and $2.5 million attributable to the corporate functions during the three and six months ended June 30, 2021 are related to the 2021 Plan. Additionally, as part of the 2019 Phase 2 Plan, GCP incurred $0.1 million of asset write offs attributable to the SBM segment during the three months ended and $0.1 million of asset write off attributable to the SCC segment during the six months ended June 30, 2021. These asset write offs are recorded with a corresponding reduction to "Properties and equipment, net" in the accompanying unaudited Consolidated Balance Sheets. These expenses are not recorded with a corresponding adjustment to the restructuring liability and therefore, are not included in the table above.

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Schedule of Pre-tax, Tax, and After-tax Components of Other Comprehensive Loss	The following tables present the pre-tax, tax benefit (expense), and after-tax components of GCP's other comprehensive loss for the three and six months ended June 30, 2021 and 2020: Three Months Ended June 30, 2021 (In millions) Pre-Tax Amount Tax Benefit After-Tax Amount Defined benefit pension and other postretirement plans $ 0.1 $ — $ 0.1 Currency translation adjustments (1) 4.8 0.1 4.9 Other comprehensive income attributable to GCP shareholders $ 4.9 $ 0.1 $ 5.0 Six Months Ended June 30, 2021 (In millions) Pre-Tax Amount Tax Expense After-Tax Amount Defined benefit pension and other postretirement plans $ 0.1 $ — $ 0.1 Currency translation adjustments (1) (2.8) (0.3) (3.1) Other comprehensive loss attributable to GCP shareholders $ (2.7) $ (0.3) $ (3.0) Three Months Ended June 30, 2020 (In millions) Pre-Tax Amount Tax Benefit After-Tax Amount Currency translation adjustments (1) $ 4.7 $ 0.2 $ 4.9 Loss from hedging activities (0.1) — (0.1) Other comprehensive income attributable to GCP shareholders $ 4.6 $ 0.2 $ 4.8 Six Months Ended June 30, 2020 (In millions) Pre-Tax Amount Tax Expense After-Tax Amount Defined benefit pension and other postretirement plans $ 0.1 $ — $ 0.1 Currency translation adjustments (1) (28.7) (0.2) (28.9) Gain from hedging activities 0.1 — 0.1 Other comprehensive loss attributable to GCP shareholders $ (28.5) $ (0.2) $ (28.7) _____________________ (1) Currency translation adjustments related to the net investment hedge are presented net of income taxes, as discussed in Note 4, "Derivative Instruments."
Schedule of Changes of Accumulated Other Comprehensive Loss, Net of Tax	The following tables present the changes in accumulated other comprehensive loss, net of tax, for the six months ended June 30, 2021 and 2020: (In millions) Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments Hedging Activities Total Balance, December 31, 2020 $ (3.1) $ (107.4) $ — $ (110.5) Other comprehensive income (loss) before reclassifications 0.1 (3.1) 0.1 (2.9) Amounts reclassified from accumulated other comprehensive loss — — (0.1) (0.1) Current-period other comprehensive income (loss) 0.1 (3.1) — (3.0) Balance, June 30, 2021 $ (3.0) $ (110.5) $ — $ (113.5) (In millions) Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments Hedging Activities Total Balance, December 31, 2019 $ (2.7) $ (114.2) $ (0.1) $ (117.0) Current period other comprehensive income (loss) 0.1 (28.9) 0.1 $ (28.7) Balance, June 30, 2020 $ (2.6) $ (143.1) $ — $ (145.7)

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Summary of Restricted Stock Units Award Activity	The following table sets forth the RSU activity for the six months ended June 30, 2021: RSU Activity Number Of Weighted Outstanding, December 31, 2020 305 $ 22.14 Less: RSUs settled (174) 22.56 Less: RSUs forfeited (16) 23.70 RSUs granted 121 25.97 RSUs outstanding, June 30, 2021 236 $ 23.72 Expected to vest as of June 30, 2021 232 $ 23.70
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 six months ended June 30, 2021 and 2020: Six Months Ended June 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 six months ended June 30, 2021: PBU Activity Number Of Weighted Outstanding, December 31, 2020 343 $ 28.10 Less: PBU's forfeited (161) 30.89 PBU's granted 92 27.28 Outstanding, June 30, 2021 274 $ 26.15

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 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 June 30, Six Months Ended June 30, (In millions, except per share amounts) 2021 2020 2021 2020 Numerators Income (loss) from continuing operations attributable to GCP shareholders $ 10.4 $ (0.7) $ 11.9 $ 1.3 Loss from discontinued operations, net of income taxes (0.2) — (0.2) (0.3) Net income (loss) attributable to GCP shareholders $ 10.2 $ (0.7) $ 11.7 $ 1.0 Denominators Weighted average common shares—basic calculation 73.4 72.9 73.2 72.9 Dilutive effect of employee stock awards (2) 0.1 — 0.2 0.1 Weighted average common shares—diluted calculation 73.5 72.9 73.4 73.0 Basic earnings (loss) per share: (2) Income (loss) from continuing operations attributable to GCP shareholders $ 0.14 $ (0.01) $ 0.16 $ 0.02 Loss from discontinued operations, net of income taxes $ — $ — $ — $ — Net income (loss) attributable to GCP shareholders (1) $ 0.14 $ (0.01) $ 0.16 $ 0.01 Diluted earnings (loss) per share: (2) Income (loss) from continuing operations attributable to GCP shareholders $ 0.14 $ (0.01) $ 0.16 $ 0.02 Loss from discontinued operations, net of income taxes $ — $ — $ — $ — Net income (loss) attributable to GCP shareholders (1) $ 0.14 $ (0.01) $ 0.16 $ 0.01 ________________________________ (1) Amounts may not sum due to rounding. (2) Dilutive effect is only applicable to the periods during which GCP generated net income from continuing operations.

Operating Segment and Geograp_2

Operating Segment and Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Schedule of Operating Segment Data	The following table presents information related to GCP's operating segments: Three Months Ended June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 Net Sales Specialty Construction Chemicals $ 144.6 $ 115.9 $ 268.5 $ 241.3 Specialty Building Materials 108.8 79.5 207.7 170.8 Total net sales $ 253.4 $ 195.4 $ 476.2 $ 412.1 Segment Operating Income Specialty Construction Chemicals $ 15.3 $ 10.0 $ 21.4 $ 18.5 Specialty Building Materials 19.9 11.6 39.3 25.7 Total segment operating income $ 35.2 $ 21.6 $ 60.7 $ 44.2
Reconciliation of Operating Segment Data to Financial Statements	Total segment operating income for the three and six months ended June 30, 2021 and 2020 is reconciled below to "Income from continuing operations before income taxes" presented in the accompanying unaudited Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 Total segment operating income (1) $ 35.2 $ 21.6 $ 60.7 $ 44.2 Corporate costs (6.8) (6.3) (14.0) (12.2) Certain pension costs (1.5) (1.3) (2.9) (2.6) Shareholder activism and other related costs (2) — (3.8) — (7.4) Repositioning expenses (0.5) (1.0) (1.8) (3.7) Restructuring expenses and asset write offs (6.5) (0.4) (14.1) (3.5) Third-party and other acquisition-related costs (0.4) (0.2) (0.5) (0.7) Gain on Brazil tax recoveries 3.3 — 3.3 — Net income attributable to noncontrolling interests 0.1 0.1 0.2 0.2 Interest expense, net (5.4) (4.7) (10.8) (9.8) Income from continuing operations before income taxes $ 17.5 $ 4.0 $ 20.1 $ 4.5 __________________________ (1) Certain amounts related to COVID-19 costs have been reclassified between segments' operating income and corporate expenses that do not get allocated directly to the segments. Such reclassifications have not materially affected previously reported amounts. (2) Shareholder activism and other related costs consist primarily of professional fees incurred in connection with the actions by certain of GCP shareholders seeking changes in the composition of the Company's Board of Directors and nomination of candidates to stand for election at the 2020 Annual Shareholders' Meeting, as well as other related matters.
Net Sales by Geographic Area	The table below presents information related to the geographic areas in which GCP operates. Three Months Ended June 30, Six Months Ended June 30, (In millions) 2021 2020 2021 2020 Net Sales United States $ 123.9 $ 106.3 $ 236.0 $ 219.3 Canada and Other 8.2 6.0 14.2 12.2 Total North America 132.1 112.3 250.2 231.5 Europe Middle East Africa 54.1 34.6 98.7 78.9 Asia Pacific 52.6 39.7 99.3 80.0 Latin America 14.6 8.8 28.0 21.7 Total $ 253.4 $ 195.4 $ 476.2 $ 412.1

Revisions of Previously Issue_2

Revisions of Previously Issued Consolidated Financial Statements (Tables)	6 Months Ended
	Jun. 30, 2021
Accounting Changes and Error Corrections [Abstract]
Schedule of Error Corrections and Prior Period Adjustments	GCP Applied Technologies Inc. Consolidated Statements of Operations (unaudited) Three Months Ended June 30, 2020 (In millions, except per share amounts) As Previously Reported Adjustments As Revised Net sales $ 195.4 $ — $ 195.4 Cost of goods sold 119.0 (1.0) 118.0 Gross profit 76.4 1.0 77.4 Selling, general and administrative expenses 65.7 0.3 66.0 Research and development expenses 3.7 — 3.7 Interest expense and related financing costs 5.0 — 5.0 Repositioning expenses 1.0 — 1.0 Restructuring expenses and asset write offs 0.4 — 0.4 Other income, net (2.7) — (2.7) Total costs and expenses 73.1 0.3 73.4 Income from continuing operations before income taxes 3.3 0.7 4.0 Provision for income taxes (4.5) (0.1) (4.6) (Loss) income from continuing operations (1.2) 0.6 (0.6) Income from discontinued operations, net of income taxes — — — Net (loss) income (1.2) 0.6 (0.6) Less: Net income attributable to non-controlling interests (0.1) — (0.1) Net (loss) income attributable to GCP shareholders $ (1.3) $ 0.6 $ (0.7) Amounts Attributable to GCP Shareholders: Net (loss) income from continuing operations attributable to GCP shareholders (1.3) 0.6 $ (0.7) Loss from discontinued operations, net of income taxes — — — Net (loss) income attributable to GCP shareholders $ (1.3) $ 0.6 $ (0.7) Earnings (Loss) Per Share Attributable to GCP Shareholders Basic earnings (loss) per share: Net (loss) income from continuing operations attributable to GCP shareholders $ (0.02) $ 0.01 $ (0.01) Loss from discontinued operations, net of income taxes $ — $ — Net (loss) income attributable to GCP shareholders (1) $ (0.02) $ 0.01 $ (0.01) Weighted average number of basic shares 72.9 72.9 Diluted earnings (loss) per share: (Loss) income from continuing operations attributable to GCP shareholders $ (0.02) $ 0.01 $ (0.01) Loss from discontinued operations, net of income taxes $ — $ — Net (loss) income attributable to GCP shareholders (1) $ (0.02) $ 0.01 $ (0.01) Weighted average number of diluted shares 72.9 72.9 (1) Amounts may not sum due to rounding. Six Months Ended June 30, 2020 (In millions, except per share amounts) As Previously Reported Adjustments As Revised Net sales $ 412.1 $ — $ 412.1 Cost of goods sold 253.8 (1.9) 251.9 Gross profit 158.3 1.9 160.2 Selling, general and administrative expenses 133.8 0.3 134.1 Research and development expenses 8.6 — 8.6 Interest expense and related financing costs 10.7 — 10.7 Repositioning expenses 3.7 — 3.7 Restructuring expenses and asset write offs 3.5 — 3.5 Other income, net (4.9) — (4.9) Total costs and expenses 155.4 0.3 155.7 Income from continuing operations before income taxes 2.9 1.6 4.5 Provision for income taxes (2.6) (0.4) (3.0) Income from continuing operations 0.3 1.2 1.5 Loss from discontinued operations, net of income taxes (0.3) — (0.3) Net income — 1.2 1.2 Less: Net loss attributable to non-controlling interests (0.2) — (0.2) Net (loss) income attributable to GCP shareholders $ (0.2) $ 1.2 $ 1.0 Amounts Attributable to GCP Shareholders: Income from continuing operations attributable to GCP shareholders 0.1 $ 1.2 $ 1.3 Loss from discontinued operations, net of income taxes (0.3) — (0.3) Net (loss) income attributable to GCP shareholders $ (0.2) $ 1.2 $ 1.0 Earnings (Loss) Per Share Attributable to GCP Shareholders Basic earnings (loss) per share: Income from continuing operations attributable to GCP shareholders $ — $ 0.02 $ 0.02 Loss from discontinued operations, net of income taxes $ — $ — $ — Net income attributable to GCP shareholders (1) $ — $ 0.01 $ 0.01 Weighted average number of basic shares 72.9 — 72.9 Diluted earnings (loss) per share: Income from continuing operations attributable to GCP shareholders $ — $ 0.02 $ 0.02 Loss from discontinued operations, net of income taxes $ — $ — $ — Net income attributable to GCP shareholders (1) $ — $ 0.01 $ 0.01 Weighted average number of diluted shares 73.0 — 73.0 (1) Amounts may not sum due to rounding GCP Applied Technologies Inc. Consolidated Statements of Comprehensive Income (unaudited) Three Months Ended June 30, 2020 (In millions) As Previously Reported Adjustments As Revised Net (loss) income $ (1.2) $ 0.6 $ (0.6) Other comprehensive income: Currency translation adjustments, net of income taxes 4.9 — 4.9 Loss from hedging activities, net of income taxes (0.1) — (0.1) Total other comprehensive income 4.8 — 4.8 Comprehensive income 3.6 0.6 4.2 Less: Comprehensive loss attributable to noncontrolling interests (0.1) — (0.1) Comprehensive income attributable to GCP shareholders $ 3.5 $ 0.6 $ 4.1 Six Months Ended June 30, 2020 (In millions) As Previously Reported Adjustments As Revised Net income $ — $ 1.2 $ 1.2 Other comprehensive loss: Defined benefit pension and other postretirement plans, net of income taxes 0.1 — 0.1 Currency translation adjustments, net of income taxes (28.9) — (28.9) Gain from hedging activities, net of income taxes 0.1 — 0.1 Total other comprehensive loss (28.7) — (28.7) Comprehensive loss (28.7) 1.2 (27.5) Less: Comprehensive loss attributable to noncontrolling interests (0.2) — (0.2) Comprehensive income (loss) attributable to GCP shareholders $ (28.9) $ 1.2 $ (27.7) GCP Applied Technologies Inc. Consolidated Statements of Stockholders' Equity (unaudited) (In millions) As Previously Reported Adjustments As Revised Total Stockholders' Equity: Balance, December 31, 2019 $ 541.1 $ (0.1) $ 541.0 Net income — 1.2 1.2 Share-based compensation 2.8 — 2.8 Exercise of stock options 0.7 — 0.7 Share repurchases (0.3) — (0.3) Dividends and other changes in non-controlling interest (0.4) — (0.4) Other comprehensive loss (28.7) — (28.7) Balance, June 30, 2020 $ 515.2 $ 1.1 $ 516.3 GCP Applied Technologies Inc. Consolidated Statements of Cash Flows (unaudited) Six Months Ended June 30, 2020 (In millions) As Previously Reported Adjustments As Revised OPERATING ACTIVITIES Net income $ — $ 1.2 $ 1.2 Less: Loss from discontinued operations (0.3) — (0.3) Income from continuing operations 0.3 1.2 1.5 Reconciliation to net cash provided by operating activities: Depreciation and amortization 22.7 — 22.7 Amortization of debt discount and financing costs 0.7 — 0.7 Stock-based compensation expense 2.3 — 2.3 Unrealized loss on foreign currency 1.6 — 1.6 Deferred income taxes (5.8) 0.4 (5.4) Loss on disposal of property and equipment 0.1 — 0.1 Changes in assets and liabilities, excluding effect of currency translation: Trade accounts receivable 30.3 — 30.3 Inventories (5.1) — (5.1) Accounts payable (13.5) — (13.5) Pension assets and liabilities, net 1.6 — 1.6 Other assets and liabilities, net (15.3) (1.6) (16.9) Net cash provided by operating activities from continuing operations 19.9 — 19.9 Net cash used in operating activities from discontinued operations (2.3) — (2.3) Net cash provided by operating activities 17.6 — 17.6 INVESTING ACTIVITIES Capital expenditures (18.8) — (18.8) Other investing activities 0.4 — 0.4 Net cash used in investing activities (18.4) — (18.4) FINANCING ACTIVITIES Payments on finance lease obligations (0.4) — (0.4) Payments of tax withholding obligations related to employee equity awards (0.3) — (0.3) Proceeds from exercise of stock options 0.7 — 0.7 Payments of dividends to noncontrolling interests (0.4) — (0.4) Net cash used in financing activities from continuing operations (0.4) — (0.4) Effect of currency exchange rate changes on cash and cash equivalents (5.6) — (5.6) Decrease in cash and cash equivalents (6.8) — (6.8) Cash and cash equivalents, beginning of period 325.0 — 325.0 Cash and cash equivalents, end of period $ 318.2 $ — $ 318.2 Supplemental disclosure of non-cash investing activities: Property and equipment purchases unpaid and included in accounts payable $ 5.3 $ — $ 5.3

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021segment	Jul. 03, 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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net sales	$ 253.4	$ 195.4	$ 476.2	$ 412.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, remaining performance obligation	$ 10.1		$ 10.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | 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]: 2021-07-01 | 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	$ 9.8	9.1	$ 19.2	17.9
Service revenue	2.3	1.6	4.3	3
Net sales	$ 6.1	$ 6.4	$ 12.2	$ 13.1

Inventories, net (Details)

Inventories, net (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Inventory [Line Items]
Raw materials	$ 58.4	$ 41.3
In process	5.1	4.2
Finished products and other	64.8	52.9
Total inventories, net	128.3	98.4
Finished Products Purchased
Inventory [Line Items]
Finished products and other	$ 10.1	$ 9.1

Derivative Instruments - Narrat

Derivative Instruments - Narrative (Details) € in Millions	Jun. 30, 2021EUR (€)derivative_instrument
Foreign exchange forward contracts
Derivative [Line Items]
Number of derivative instruments | derivative_instrument	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

Derivative Instruments - Net In

Derivative Instruments - Net Investment Hedges in Balance Sheets (Details) - Foreign exchange forward contracts - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative assets	$ 0.6	$ 0
Derivative liability	(0.8)	(1.8)
Derivative assets, current	0.3
Derivative assets, noncurrent	$ 0.3
Derivative liability, current		0.4
Derivative liability, noncurrent		$ 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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative [Line Items]
Gains (losses) on foreign exchange forward contracts - cumulative translation adjustments, net of tax benefit	$ 4.9	$ 4.9	$ (3.1)	$ (28.9)
Foreign exchange forward contracts
Derivative [Line Items]
Gains (losses) on foreign exchange forward contracts - other income, net	0.2	0.2	0.4	0.5
Gains (losses) on foreign exchange forward contracts - cumulative translation adjustments, net of tax benefit	(0.5)	(0.8)	0.9	0.5
Gain on foreign exchange forward contracts - cumulative translation adjustments, tax (benefit) expense	$ 0.1	$ 0.2	$ 0.3	$ 0.2

Debt and Other Borrowings - Com

Debt and Other Borrowings - Components of Debt (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 351,300,000	$ 351,700,000
Less: debt payable within one year	2,400,000	2,800,000
Debt payable after one year	$ 348,900,000	$ 348,900,000
Weighted average interest rates on total debt obligations	5.50%	5.50%
Finance lease obligations	$ 2,700,000	$ 3,000,000
Senior Notes | 5.5% Senior notes due in 2026
Debt Instrument [Line Items]
Stated interest rate	5.50%
Unamortized debt issuance cost	$ 3,100,000	3,300,000
Total debt	346,900,000	346,600,000
Revolving credit facility due 2023 | Revolving credit facility
Debt Instrument [Line Items]
Unamortized debt issuance cost	1,700,000	2,200,000
Total debt	0	0
Aggregate available principal amount	350,000,000	350,000,000
Other borrowings
Debt Instrument [Line Items]
Total debt	4,400,000	5,100,000
Lines of credit and other borrowings
Debt Instrument [Line Items]
Total debt	1,700,000	$ 2,100,000
Aggregate available principal amount	$ 45,100,000

Debt and Other Borrowings - Pri

Debt and Other Borrowings - Principal Maturities of Debt Outstanding (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Remainder of 2021	$ 2.1
2022	0.8
2023	0.7
2024	0.7
2025	0.1
Thereafter	346.9
Total debt	$ 351.3	$ 351.7

Debt and Other Borrowings - Nar

Debt and Other Borrowings - Narrative (Details) - USD ($)	Apr. 15, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Senior Notes | 5.5% Senior Notes due in 2026
Debt Instrument [Line Items]
Stated interest rate		5.50%
Aggregate principal amount		$ 350,000,000
Interest payment	$ 9,600,000
Unamortized debt issuance cost		3,100,000		$ 3,300,000
Line of Credit
Debt Instrument [Line Items]
Available credit		347,400,000		347,400,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings		0		0
Interest payments		0	$ 0
Unamortized debt issuance cost		1,700,000		2,200,000
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Outstanding borrowings		$ 2,600,000		$ 2,600,000

Debt and Other Borrowings - Car

Debt and Other Borrowings - Carrying Amounts and Fair Values of Debt Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
5.5% Senior Notes due in 2026 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.50%
Carrying Amount
Debt Instrument [Line Items]
Long-term debt, fair value	$ 351.3	$ 351.7
Carrying Amount | Other borrowings
Debt Instrument [Line Items]
Long-term debt, fair value	4.4	5.1
Carrying Amount | 5.5% Senior Notes due in 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	346.9	346.6
Fair Value
Debt Instrument [Line Items]
Long-term debt, fair value	365.7	367.1
Fair Value | Other borrowings
Debt Instrument [Line Items]
Long-term debt, fair value	4.4	5.1
Fair Value | 5.5% Senior Notes due in 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	$ 361.3	$ 362

Lessee Arrangements - Lease Exp

Lessee Arrangements - Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease expense	$ 4.1	$ 3	$ 8.4	$ 6.2
Variable lease expense	1.5	1.3	2.5	2.4
Short-term lease expense	0.5	0.8	1.2	1.4
Total lease expense	$ 6.1	$ 5.1	$ 12.1	$ 10

Lessee Arrangements - Supplemen

Lessee Arrangements - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Jul. 31, 2020
Lessee, Lease, Description [Line Items]
Cash paid for operating lease liabilities, classified as operating cash flows	$ 5.3	$ 6.2
Operating lease right of use assets obtained in exchange for new lease obligations	2.3	$ 11.8
Operating lease right-of-use assets	$ 35.1		$ 40
IQHQ, L.P
Lessee, Lease, Description [Line Items]
Lease term				18 months
Operating lease right-of-use assets				$ 8.6

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Contingency [Line Items]
Provision for income taxes	$ 7	$ 4.6	$ 8	$ 3
Effective tax rate	40.00%	115.00%	(39.80%)	66.70%
Effect of tax rates in foreign jurisdictions	$ 1		$ 1
Nondeductible expense, executive compensation and other	0.7		0.8
Valuation allowance expense (benefit)	1.2	$ 0.4	1.2	$ 1
Net expenses due to 2017 Tax Act		3.2
Tax expense on unrecognized tax benefits		$ 0.4		$ 0.7
FRANCE
Income Tax Contingency [Line Items]
Valuation allowance expense (benefit)	1.2		1.4
Valuation allowance, DTA increase			0.2
UNITED KINGDOM
Income Tax Contingency [Line Items]
Effect of tax rates in foreign jurisdictions	$ 2.9		$ 2.9

Pension Plans and Other Postr_3

Pension Plans and Other Postretirement Benefit Plans - Net Funded Status of Over-Funded, Underfunded, and Unfunded Pension Plans (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Pension plans and other postretirement benefit plans
Overfunded defined benefit pension plans	$ 30.4	$ 29.7
Underfunded and unfunded defined benefit pension plans	(64.4)	(62.9)
Pension Plans
Pension plans and other postretirement benefit plans
Overfunded defined benefit pension plans	30.4	29.7
Underfunded and unfunded defined benefit pension plans	(64.4)	(62.9)
Pension liabilities included in other current liabilities	(1.3)	(1.4)
Net funded status	(35.3)	(34.6)
Underfunded defined benefit pension plans | Pension Plans
Pension plans and other postretirement benefit plans
Underfunded and unfunded defined benefit pension plans	(35.5)	(33.3)
Unfunded defined benefit pension plans | Pension Plans
Pension plans and other postretirement benefit plans
Underfunded and unfunded defined benefit pension plans	$ (28.9)	$ (29.6)

Pension Plans and Other Postr_4

Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.8	$ 1.8	$ 3.6	$ 3.5
Interest cost	1.9	2.2	3.8	4.6
Expected return on plan assets	(2.3)	(2.8)	(4.6)	(5.6)
Amortization of prior service cost	0.1	0.1	0.1	0.1
Net periodic benefit cost	1.5	1.3	2.9	2.6
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1.6	1.6	3.1	3.1
Interest cost	1.2	1.2	2.4	2.5
Expected return on plan assets	(1.6)	(1.7)	(3.1)	(3.3)
Amortization of prior service cost	0	0	0	0
Net periodic benefit cost	1.2	1.1	2.4	2.3
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.2	0.2	0.5	0.4
Interest cost	0.7	1	1.4	2.1
Expected return on plan assets	(0.7)	(1.1)	(1.5)	(2.3)
Amortization of prior service cost	0.1	0.1	0.1	0.1
Net periodic benefit cost	$ 0.3	$ 0.2	$ 0.5	$ 0.3

Pension Plans and Other Postr_5

Pension Plans and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	Jan. 01, 2018	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension plans and other postretirement benefit plans
Defined contribution plan, percentage that the employer contributes of employee contributions under 401(k) plan				100.00%
Defined contribution plan, maximum percentage of employee compensation match by employer to defined contribution plan				6.00%
Defined contribution plan, additional maximum percentage of employee compensation match by employer to defined contribution plan	2.00%
Defined contribution plan, vesting requirement	3 years
Defined contribution plan, costs		$ 1.3	$ 0.9	$ 2.3	$ 2.2
Pension Plans | United States
Pension plans and other postretirement benefit plans
Employer contributions		0.1	0.6	0.3	0.7
Pension Plans | Non-U.S.
Pension plans and other postretirement benefit plans
Employer contributions		$ 0.5	$ 0.3	$ 0.8	$ 0.8

Other Balance Sheet Informati_3

Other Balance Sheet Information - Other Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Other Current Assets:
Non-trade receivables	$ 21.4	$ 20.4
Prepaid expenses and other current assets	16.9	11.1
Income taxes receivable	8	9.7
Total other current assets	$ 46.3	$ 41.2

Other Balance Sheet Informati_4

Other Balance Sheet Information - Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Other Current Liabilities:
Accrued customer volume rebates	$ 18.5		$ 24.4
Accrued compensation	23.1		25
Income taxes payable	7.9		7.1
Accrued interest	4		4
Pension liabilities	1.3		1.4
Restructuring liability	16.1	$ 16.7	18
Other accrued liabilities	45.8		45.9
Total other current liabilities	$ 116.7		$ 125.8

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	Mar. 30, 2021	Dec. 31, 2019	Jun. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Gain on brazil tax recoveries, net		$ 3.3
Damages of approximately	$ 11
Claim amount of approximately	16
Net of contractual deductible	$ 5
Amended Credit Agreement | Standby Letter of Credit
Loss Contingencies [Line Items]
Gross financial assurances issued and outstanding			$ 6.2	$ 6.8

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jul. 30, 2020
Equity [Abstract]
Share repurchase program, authorized amount			$ 100
Stock repurchased (in shares)	0	0

Stockholders' Equity - Changes

Stockholders' Equity - Changes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021		Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020		Jul. 30, 2020
Increase (Decrease) in Stockholders' Equity
Beginning balance	$ 650.6		$ 509.9	$ 654.1		$ 541
Net income (loss)	10.3		(0.6)	11.9		1.2
Share-based compensation	2.6		2.3	4	[1]	2.8
Exercise of stock options	2.1		0.3	$ 4.3	[2]	$ 0.7	[2]
Share repurchases (in shares)				62,400		17,300
Share repurchases	(0.9)			$ (1.6)	[3]	$ (0.3)	[3]
Current period other comprehensive income (loss)	5		4.8	(3)		(28.7)
Dividends and other changes in noncontrolling interest			(0.4)			(0.4)
Ending balance	$ 669.7		$ 516.3	$ 669.7		$ 516.3
Share repurchase program, authorized amount								$ 100
Stock repurchased (in shares)	0			0
Common Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance (in shares)	73,700,000		73,300,000	73,500,000	[2]	73,200,000	[2]
Beginning balance	$ 0.7		$ 0.7	$ 0.7		$ 0.7
Issuance of common stock in connection with stock plans (in shares)	100,000			200,000	[2]	100,000	[2]
Exercise of stock options (in shares)	200,000			300,000	[2]
Ending balance (in shares)	74,000,000	[2]	73,300,000	74,000,000	[2]	73,300,000
Ending balance	$ 0.7		$ 0.7	$ 0.7		$ 0.7
Treasury Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance (in shares)	500,000		400,000	400,000	[2]	300,000	[2]
Beginning balance	$ (11.4)		$ (8.9)	$ (10.7)		$ (8.6)
Share repurchases (in shares)	0			100,000	[2],[3]	100,000	[2],[3]
Share repurchases	$ (0.9)			$ (1.6)	[3]	$ (0.3)	[3]
Ending balance (in shares)	500,000	[2]	400,000	500,000	[2]	400,000
Ending balance	$ (12.3)		$ (8.9)	$ (12.3)		$ (8.9)
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity
Beginning balance	65.5		54.3	61.9		53.4
Share-based compensation	2.6		2.3	4	[1]	2.8
Exercise of stock options	2.1		0.3	4.3	[2]	0.7	[2]
Ending balance	70.2		56.9	70.2		56.9
Accumulated Earnings
Increase (Decrease) in Stockholders' Equity
Beginning balance	711.8		611.8	710.3		610.1
Net income (loss)	10.2		(0.7)	11.7		1
Ending balance	722		611.1	722		611.1
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity
Beginning balance	(118.5)		(150.5)	(110.5)		(117)
Current period other comprehensive income (loss)	5		4.8	(3)		(28.7)
Ending balance	(113.5)		(145.7)	(113.5)		(145.7)
Non-Controlling Interests
Increase (Decrease) in Stockholders' Equity
Beginning balance	2.5		2.5	2.4		2.4
Net income (loss)	0.1		0.1	0.2		0.2
Dividends and other changes in noncontrolling interest			(0.4)			(0.4)
Ending balance	$ 2.6		$ 2.2	$ 2.6		$ 2.2
[1]	During the six months ended June 30, 2021, $0.9 million of the stock-based compensation expense is included in "Restructuring expenses and asset write offs" related to accelerated vesting of stock options, RSUs and PBUs.
[2]	The par value of common shares issued may not be included in the table due to rounding. Total share amounts for common stock and treasury stock may not sum due to rounding.
[3]	Relates to shares withheld for tax payments on exercise of stock options and vesting of RSUs and PBUs. Refer to Note 14, “Stock Incentive Plans”, for further information.

Restructuring and Repositioni_3

Restructuring and Repositioning Expenses, Asset Write Offs - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)segment	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Jul. 31, 2019
Restructuring Cost and Reserve [Line Items]
Number of operating segments | segment	2
Restructuring liability | $	$ 16.1	$ 16.7	$ 18
Minimum
Restructuring Cost and Reserve [Line Items]
Expected reduction in workforce, percent				8.00%
Maximum
Restructuring Cost and Reserve [Line Items]
Expected reduction in workforce, percent				10.00%

Restructuring and Repositioni_4

Restructuring and Repositioning Expenses, Asset Write Offs - Estimated and Actual Costs (Details) $ in Millions	Jun. 30, 2021USD ($)
2021 Plan
Restructuring Cost and Reserve [Line Items]
Estimated capital expenditures	$ 6
Cost to date	13.8
Capital expenditures to date	0
2021 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	26
2021 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	29
2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	12.6
Capital expenditures to date	2.3
2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	33.8
Capital expenditures to date	0.4
Severance/employee costs | 2021 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	9.8
Severance/employee costs | 2021 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	11
Severance/employee costs | 2021 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	13
Severance/employee costs | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	0.9
Severance/employee costs | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	25.9
Asset Write Offs | 2021 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	2.4
Asset Write Offs | 2021 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	8
Asset Write Offs | 2021 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	9
Asset Write Offs | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	0.9
Asset Write Offs | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	0.6
Other Associated Costs | 2021 Plan
Restructuring Cost and Reserve [Line Items]
Estimated costs	5
Cost to date	1.1
Other Associated Costs | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	0.3
Other Associated Costs | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	0
Total Restructuring | 2021 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	13.3
Total Restructuring | 2021 Plan | Specialty Construction Chemicals
Restructuring Cost and Reserve [Line Items]
Cost to date	5.9
Total Restructuring | 2021 Plan | Specialty Building Materials
Restructuring Cost and Reserve [Line Items]
Cost to date	3.7
Total Restructuring | 2021 Plan | Corporate Function
Restructuring Cost and Reserve [Line Items]
Cost to date	3.7
Total Restructuring | 2021 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated costs	24
Total Restructuring | 2021 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated costs	27
Total Restructuring | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	2.1
Total Restructuring | 2019 Plan | Specialty Construction Chemicals
Restructuring Cost and Reserve [Line Items]
Cost to date	1.7
Total Restructuring | 2019 Plan | Specialty Building Materials
Restructuring Cost and Reserve [Line Items]
Cost to date	0.4
Total Restructuring | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	26.5
Total Restructuring | 2019 Phase 2 Plan | Specialty Construction Chemicals
Restructuring Cost and Reserve [Line Items]
Cost to date	7.1
Total Restructuring | 2019 Phase 2 Plan | Specialty Building Materials
Restructuring Cost and Reserve [Line Items]
Cost to date	7
Total Restructuring | 2019 Phase 2 Plan | Corporate Function
Restructuring Cost and Reserve [Line Items]
Cost to date	12.4
Repositioning
Restructuring Cost and Reserve [Line Items]
Estimated costs	2
Repositioning | 2021 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	0.5
Capital expenditures to date	0.3
Repositioning | 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	10.5
Capital expenditures to date	10.5
Repositioning | 2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cost to date	7.3
Capital expenditures to date	$ 7.1

Restructuring and Repositioni_5

Restructuring and Repositioning Expenses, Asset Write Offs - Repositioning and Restructuring (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 5.8	$ 4.7
Cash paid	6.4	$ 5.9
2021 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.5			$ 0.5
Cash paid	0.3			0.3
2021 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0			0
Cash paid	0			0
2019 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0		$ 0.2	0	$ 1.6
Cash paid	0		1.2	0	4.5
2019 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.1		0.5	0.2	0.9
Cash paid	0.1		0.5	0.2	0.8
2019 Plan Phase 2, Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0		0.7	1.3	1.9
Cash paid	0.6		1.3	2	2.8
2019 Plan Phase 2, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0		0.2	0	0.3
Cash paid	0		0.1	0	0.2
Strategic Alternatives Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			0		0
Cash paid			0.8		1
Strategic Alternatives, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			0		0
Cash paid			0		0
2018 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			0.1		0.1
Cash paid			0		0
2018 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			0.2		0.5
Cash paid			0.3		0.4
2017 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			0		0.1
Cash paid			0.2		0.2
2017 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			0.7		0.9
Cash paid			0.6		1.2
Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.5		1	1.8	3.7
Cash paid	0.9		3.5	2.3	8.5
Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.1		1.6	0.2	2.6
Cash paid	$ 0.1		$ 1.5	$ 0.2	$ 2.6

Restructuring and Repositioni_6

Restructuring and Repositioning Expenses, Asset Write Offs - Cumulative (Details) $ in Millions	Jun. 30, 2021USD ($)
2021 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	$ 13.8
Capital expenditures to date	0
2021 Plan, Repositioning | Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	0.5
Capital expenditures to date	0.3
2021 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Cost to date	0
Capital expenditures to date	0
2019 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	12.6
Capital expenditures to date	2.3
2019 Plan, Repositioning | Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	10.5
Capital expenditures to date	10.5
2019 Plan, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Cost to date	2.3
Capital expenditures to date	2.2
2019 Phase 2 Plan, Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	33.8
Capital expenditures to date	0.4
2019 Phase 2 Plan, Repositioning | Repositioning
Restructuring Cost and Reserve [Line Items]
Cost to date	7.3
Capital expenditures to date	7.1
2019 Plan Phase 2, Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Cost to date	0.4
Capital expenditures to date	$ 0.4

Restructuring and Repositioni_7

Restructuring and Repositioning Expenses, Asset Write Offs - Restructuring Expenses and Asset Write Offs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring and Related Activities [Abstract]
Severance and other employee costs	$ 5	$ 0	$ 10.2	$ 1.9
Asset write offs	0.5	0.2	2.7	1.2
Other associated costs	1	0.2	1.2	0.4
Total restructuring expenses and asset write offs	$ 6.5	$ 0.4	$ 14.1	$ 3.5

Restructuring and Repositioni_8

Restructuring and Repositioning Expenses, Asset Write Offs - Restructuring Costs by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses and asset write offs from continuing operations	$ 6.5	$ 0.4	$ 14.1	$ 3.5
Operating Segments | SCC
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses and asset write offs from continuing operations	3.1	0.3	6	2.6
Operating Segments | SBM
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses and asset write offs from continuing operations	1.9	0.1	3.7	0.9
Corporate
Restructuring Cost and Reserve [Line Items]
Total restructuring expenses and asset write offs from continuing operations	$ 1.5	$ 0	$ 4.4	$ 0

Restructuring and Repositioni_9

Restructuring and Repositioning Expenses, Asset Write Offs - Restructuring Liability (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Beginning balance	$ 16.7	$ 18		$ 18
Expense	5.8	4.7
Payments	(6.4)	(5.9)
Impact of foreign currency and other		(0.1)
Ending balance	16.1	16.7		16.1
Total stock compensation (benefit) expense	1.8		$ 1.5	3.5	$ 2.3
2021 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	4.3	0		0
Expense	5.3	4.5
Payments	(1.8)	(0.2)
Impact of foreign currency and other		0
Ending balance	7.8	4.3		7.8
2021 Plan | Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance	0	0		0
Expense	0.9	0
Payments	(0.4)	0
Impact of foreign currency and other		0
Ending balance	0.5	0		0.5
2021 Plan | Asset Write Offs
Restructuring Reserve [Roll Forward]
Expense	0.4			2.5
2019 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.1	0.1		0.1
Expense	0	0
Payments	0	0
Impact of foreign currency and other		0
Ending balance	0.1	0.1		0.1
2019 Plan | Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.1	0.1		0.1
Expense	0	0
Payments	0	0
Impact of foreign currency and other		0
Ending balance	0.1	0.1		0.1
2019 Plan | Asset Write Offs | Specialty Construction Chemicals
Restructuring Reserve [Roll Forward]
Expense	0.1			0.1
2019 Phase 2 Plan
Restructuring Reserve [Roll Forward]
Total stock compensation (benefit) expense	0.2			0.9
2019 Phase 2 Plan | Corporate Function
Restructuring Reserve [Roll Forward]
Expense				0.7
2019 Phase 2 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	11.7	17.3		17.3
Expense	(0.1)	0.2
Payments	(4.1)	(5.7)
Impact of foreign currency and other		(0.1)
Ending balance	7.5	11.7		7.5
2018 Plan
Restructuring Reserve [Roll Forward]
Expense			0.1		0.1
Payments			$ 0		$ 0
2018 Plan | Severance and other employee costs
Restructuring Reserve [Roll Forward]
Beginning balance	0.5	0.5		0.5
Expense	(0.3)	0
Payments	(0.1)	0
Impact of foreign currency and other		0
Ending balance	$ 0.1	$ 0.5		$ 0.1

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) - Components of Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	$ 4.9	$ 4.6	$ (2.7)	$ (28.5)
Tax Benefit	0.1	0.2	(0.3)	(0.2)
Total other comprehensive income (loss)	5	4.8	(3)	(28.7)
Defined benefit pension and other postretirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	0.1		0.1	0.1
Tax Benefit	0		0	0
Total other comprehensive income (loss)	0.1		0.1	0.1
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount	4.8	4.7	(2.8)	(28.7)
Tax Benefit	0.1	0.2	(0.3)	(0.2)
Total other comprehensive income (loss)	$ 4.9	4.9	$ (3.1)	(28.9)
Loss from hedging activities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax Amount		(0.1)		0.1
Tax Benefit		0		0
Total other comprehensive income (loss)		$ (0.1)		$ 0.1

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) - Changes in AOCI, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	$ 650.6	$ 509.9	$ 654.1	$ 541
Other comprehensive income (loss) before reclassifications			(2.9)
Amounts reclassified from accumulated other comprehensive loss			(0.1)
Current period other comprehensive income (loss)	5	4.8	(3)	(28.7)
Ending balance	669.7	516.3	669.7	516.3
Defined Benefit Pension and Other Postretirement Plans
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			(3.1)	(2.7)
Other comprehensive income (loss) before reclassifications			0.1
Amounts reclassified from accumulated other comprehensive loss			0
Current period other comprehensive income (loss)	0.1		0.1	0.1
Ending balance	(3)	(2.6)	(3)	(2.6)
Currency Translation Adjustments
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			(107.4)	(114.2)
Other comprehensive income (loss) before reclassifications			(3.1)
Amounts reclassified from accumulated other comprehensive loss			0
Current period other comprehensive income (loss)			(3.1)	(28.9)
Ending balance	(110.5)	(143.1)	(110.5)	(143.1)
Hedging Activities
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			0	(0.1)
Other comprehensive income (loss) before reclassifications			0.1
Amounts reclassified from accumulated other comprehensive loss			(0.1)
Current period other comprehensive income (loss)			0	0.1
Ending balance	0	0	0	0
Total
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(118.5)	(150.5)	(110.5)	(117)
Current period other comprehensive income (loss)	5	4.8	(3)	(28.7)
Ending balance	$ (113.5)	$ (145.7)	$ (113.5)	$ (145.7)

Stock Incentive Plans - Narrati

Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation (benefit) expense	$ 1.8	$ 1.5	$ 3.5	$ 2.3
Share repurchases (in shares)			62,400	17,300
Share repurchases			$ 0.9	$ 0.3
Cash payments for tax withholding obligations			$ 1.6	0.3
Grants in period (in shares)			0
Fair value of awards vested			$ 4.4	$ 1
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 3 months 18 days
Exercise of stock options (in shares)			252,000
Weighted average exercise price (in usd per share)	$ 17.17		$ 17.17
Intrinsic value of all options exercised			$ 2.2
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	$ 7.4		$ 7.4
Unrecognized stock-based compensation expense for stock options, period of recognition			2 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period (in shares)		0	121,000
Weighted average grant date fair value (in usd per share)	$ 25.99		$ 25.97	$ 21.11
Amount settled in period (in shares)			174,000	48,000
Performance Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period (in shares)			92,000
Weighted average grant date fair value (in usd per share)			$ 27.28	$ 22.41
Share-based compensation granted period			2 years
Cumulative on cash flow target metric			33.30%
Performance period			2 years
Share-based compensation approved by board during the period			2 years
Award vesting period			2 years
Performance Based Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout, percent of target			0.00%
Performance Based Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout, percent of target			200.00%
2019 Phase 2 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation (benefit) expense	$ 0.2		$ 0.9

Stock Incentive Plans - Restric

Stock Incentive Plans - Restricted Stock Units Award Activity (Details) - Restricted Stock Units (RSUs) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares)			305,000
Settled (in shares)			(174,000)
Forfeited (in shares)			(16,000)
Granted (in shares)		0	121,000
Outstanding, ending balance (in shares)	236,000		236,000
RSUs expected to vest (in shares)	232,000		232,000
Weighted Average Grant Date Fair Value
Outstanding, beginning balance (in usd per share)			$ 22.14
Settled (in usd per share)			22.56
Forfeited (in used per share)			23.70
Granted (in usd per share)	$ 25.99		25.97	$ 21.11
Outstanding, ending balance (in usd per share)	23.72		23.72
RSUs expected to vest (in usd per share)	$ 23.70		$ 23.70

Stock Incentive Plans - PBUs, V

Stock Incentive Plans - PBUs, Valuation Assumptions (Details) - Performance Based Units	6 Months Ended
	Jun. 30, 2021	Jun. 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	0.14%	1.21%
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	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares)	343
Forfeited (in shares)	(161)
Granted (in shares)	92
Outstanding, ending balance (in shares)	274
Weighted Average Grant Date Fair Value
Outstanding, beginning balance (in usd per share)	$ 28.10
Forfeited (in used per share)	30.89
Granted (in usd per share)	27.28	$ 22.41
Outstanding, ending balance (in usd per share)	$ 26.15

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerators
Income (loss) from continuing operations attributable to GCP shareholders		$ 10.4	$ (0.7)	$ 11.9	$ 1.3
Loss from discontinued operations, net of income taxes		(0.2)	0	(0.2)	(0.3)
Net income (loss) attributable to GCP shareholders		$ 10.2	$ (0.7)	$ 11.7	$ 1
Denominators
Weighted average common shares—basic calculation (in shares)	[1]	73.4	72.9	73.2	72.9
Dilutive effect of employee stock awards (in shares)		0.1	0	0.2	0.1
Weighted average common shares—diluted calculation (in shares)	[1]	73.5	72.9	73.4	73
Basic earnings (loss) per share:
Income (loss) from continuing operations attributable to GCP shareholders (in usd per share)	[1]	$ 0.14	$ (0.01)	$ 0.16	$ 0.02
Loss from discontinued operations, net of income taxes (in usd per share)	[1]	0	0	0	0
Net income (loss) attributable to GCP shareholders (in usd per share)	[1],[2]	0.14	(0.01)	0.16	0.01
Diluted earnings (loss) per share
Income (loss) from continuing operations attributable to GCP shareholders (in usd per share)	[1]	0.14	(0.01)	0.16	0.02
Loss from discontinued operations, net of income taxes (in usd per share)	[1]	0	0	0	0
Net income (loss) attributable to GCP shareholders (in usd per share)	[1],[2]	$ 0.14	$ (0.01)	$ 0.16	$ 0.01
Antidilutive securities excluded from computation of earnings per share, treasury stock method (in shares)		0.6	0.9	0.6	0.8
[1]	Dilutive effect is only applicable to the periods during which GCP generated net income from continuing operations.
[2]	Amounts may not sum due to rounding.

Related Party Transactions an_2

Related Party Transactions and Transactions with Grace (Details) - W.R. Grace & Co. - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Other Assets
Related Party Transaction [Line Items]
Indemnified receivables, tax	$ 1.8
Other Current Liabilities
Related Party Transaction [Line Items]
Indemnified payables, tax		$ 1

Operating Segment and Geograp_3

Operating Segment and Geographic Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2021segment
Segment Reporting [Abstract]
Number of operating segments	2

Operating Segment and Geograp_4

Operating Segment and Geographic Information - Schedule of Operating Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Sales
Net sales	$ 253.4	$ 195.4	$ 476.2	$ 412.1
Segment Operating Income
Operating income	35.2	21.6	60.7	44.2
Specialty Construction Chemicals
Net Sales
Net sales	144.6	115.9	268.5	241.3
Segment Operating Income
Operating income	15.3	10	21.4	18.5
Specialty Building Materials
Net Sales
Net sales	108.8	79.5	207.7	170.8
Segment Operating Income
Operating income	$ 19.9	$ 11.6	$ 39.3	$ 25.7

Operating Segment and Geograp_5

Operating Segment and Geographic Information - Reconciliation of Segment Data to Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total segment operating income	$ 35.2	$ 21.6	$ 60.7	$ 44.2
Corporate costs	(64.2)	(66)	(130.8)	(134.1)
Repositioning expenses	(0.5)	(1)	(1.8)	(3.7)
Restructuring expenses and asset write offs	(6.5)	(0.4)	(14.1)	(3.5)
Net income attributable to noncontrolling interests	0.1	0.1	0.2	0.2
Income from continuing operations before income taxes	17.5	4	20.1	4.5
Operating Segments
Segment Reporting Information [Line Items]
Total segment operating income	35.2	21.6	60.7	44.2
Corporate
Segment Reporting Information [Line Items]
Corporate costs	(6.8)	(6.3)	(14)	(12.2)
Restructuring expenses and asset write offs	(1.5)	0	(4.4)	0
Segment Reconciling Items
Segment Reporting Information [Line Items]
Certain pension costs	(1.5)	(1.3)	(2.9)	(2.6)
Shareholder activism and other related costs	0	(3.8)	0	(7.4)
Repositioning expenses	(0.5)	(1)	(1.8)	(3.7)
Restructuring expenses and asset write offs	(6.5)	(0.4)	(14.1)	(3.5)
Third-party and other acquisition-related costs	(0.4)	(0.2)	(0.5)	(0.7)
Gain on Brazil tax recoveries	3.3	0	3.3	0
Net income attributable to noncontrolling interests	0.1	0.1	0.2	0.2
Interest expense, net	$ (5.4)	$ (4.7)	$ (10.8)	$ (9.8)

Operating Segment and Geograp_6

Operating Segment and Geographic Information - Geographic Area Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 253.4	$ 195.4	$ 476.2	$ 412.1
Total North America
Segment Reporting Information [Line Items]
Net sales	132.1	112.3	250.2	231.5
United States
Segment Reporting Information [Line Items]
Net sales	123.9	106.3	236	219.3
Canada and Other
Segment Reporting Information [Line Items]
Net sales	8.2	6	14.2	12.2
Europe Middle East Africa
Segment Reporting Information [Line Items]
Net sales	54.1	34.6	98.7	78.9
Asia Pacific
Segment Reporting Information [Line Items]
Net sales	52.6	39.7	99.3	80
Latin America
Segment Reporting Information [Line Items]
Net sales	$ 14.6	$ 8.8	$ 28	$ 21.7

Revisions of Previously Issue_3

Revisions of Previously Issued Consolidated Financial Statements - Statements of Operations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		$ 253.4	$ 195.4	$ 476.2	$ 412.1
Cost of goods sold		160.3	118	296.6	251.9
Gross profit		93.1	77.4	179.6	160.2
Selling, general and administrative expenses		64.2	66	130.8	134.1
Research and development expenses		4.3	3.7	8.8	8.6
Interest expense and related financing costs		5.6	5	11.2	10.7
Repositioning expenses		0.5	1	1.8	3.7
Restructuring expenses and asset write offs		6.5	0.4	14.1	3.5
Other income, net		(5.5)	(2.7)	(7.2)	(4.9)
Total costs and expenses		75.6	73.4	159.5	155.7
Income from continuing operations before income taxes		17.5	4	20.1	4.5
Provision for income taxes		(7)	(4.6)	(8)	(3)
Income (loss) from continuing operations		10.5	(0.6)	12.1	1.5
Loss from discontinued operations, net of income taxes		(0.2)	0	(0.2)	(0.3)
Net income (loss)		10.3	(0.6)	11.9	1.2
Less: Net income attributable to noncontrolling interests		(0.1)	(0.1)	(0.2)	(0.2)
Net income (loss) attributable to GCP shareholders		10.2	(0.7)	11.7	1
Amounts Attributable to GCP Shareholders:
Income (loss) from continuing operations attributable to GCP shareholders		10.4	(0.7)	11.9	1.3
Loss from discontinued operations, net of income taxes		(0.2)	0	(0.2)	(0.3)
Net income (loss) attributable to GCP shareholders		$ 10.2	$ (0.7)	$ 11.7	$ 1
Basic earnings (loss) per share:
Net (loss) income from continuing operations attributable to GCP shareholders (in usd per share)	[1]	$ 0.14	$ (0.01)	$ 0.16	$ 0.02
Loss from discontinued operations, net of income taxes (in usd per share)	[1]	0	0	0	0
Net income (loss) attributable to GCP shareholders (in usd per share)	[1],[2]	$ 0.14	$ (0.01)	$ 0.16	$ 0.01
Weighted average number of basic shares (in shares)	[1]	73.4	72.9	73.2	72.9
Diluted earnings (loss) per share:
Income (loss) from continuing operations attributable to GCP shareholders (in usd per share)	[1]	$ 0.14	$ (0.01)	$ 0.16	$ 0.02
Loss from discontinued operations, net of income taxes (in usd per share)	[1]	0	0	0	0
Net income (loss) attributable to GCP shareholders (in usd per share)	[1],[2]	$ 0.14	$ (0.01)	$ 0.16	$ 0.01
Weighted average number of diluted shares (in shares)	[1]	73.5	72.9	73.4	73
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales			$ 195.4		$ 412.1
Cost of goods sold			119		253.8
Gross profit			76.4		158.3
Selling, general and administrative expenses			65.7		133.8
Research and development expenses			3.7		8.6
Interest expense and related financing costs			5		10.7
Repositioning expenses			1		3.7
Restructuring expenses and asset write offs			0.4		3.5
Other income, net			(2.7)		(4.9)
Total costs and expenses			73.1		155.4
Income from continuing operations before income taxes			3.3		2.9
Provision for income taxes			(4.5)		(2.6)
Income (loss) from continuing operations			(1.2)		0.3
Loss from discontinued operations, net of income taxes			0		(0.3)
Net income (loss)			(1.2)		0
Less: Net income attributable to noncontrolling interests			(0.1)		(0.2)
Net income (loss) attributable to GCP shareholders			(1.3)		(0.2)
Amounts Attributable to GCP Shareholders:
Income (loss) from continuing operations attributable to GCP shareholders			(1.3)		0.1
Loss from discontinued operations, net of income taxes			0		(0.3)
Net income (loss) attributable to GCP shareholders			$ (1.3)		$ (0.2)
Basic earnings (loss) per share:
Net (loss) income from continuing operations attributable to GCP shareholders (in usd per share)			$ (0.02)		$ 0
Loss from discontinued operations, net of income taxes (in usd per share)			0		0
Net income (loss) attributable to GCP shareholders (in usd per share)			$ (0.02)		$ 0
Weighted average number of basic shares (in shares)			72.9		72.9
Diluted earnings (loss) per share:
Income (loss) from continuing operations attributable to GCP shareholders (in usd per share)			$ (0.02)		$ 0
Loss from discontinued operations, net of income taxes (in usd per share)			0		0
Net income (loss) attributable to GCP shareholders (in usd per share)			$ (0.02)		$ 0
Weighted average number of diluted shares (in shares)			72.9		73
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales			$ 0		$ 0
Cost of goods sold			(1)		(1.9)
Gross profit			1		1.9
Selling, general and administrative expenses			0.3		0.3
Research and development expenses			0		0
Interest expense and related financing costs			0		0
Repositioning expenses			0		0
Restructuring expenses and asset write offs			0		0
Other income, net			0		0
Total costs and expenses			0.3		0.3
Income from continuing operations before income taxes			0.7		1.6
Provision for income taxes			(0.1)		(0.4)
Income (loss) from continuing operations			0.6		1.2
Loss from discontinued operations, net of income taxes			0		0
Net income (loss)			0.6		1.2
Less: Net income attributable to noncontrolling interests			0		0
Net income (loss) attributable to GCP shareholders			0.6		1.2
Amounts Attributable to GCP Shareholders:
Income (loss) from continuing operations attributable to GCP shareholders			0.6		1.2
Loss from discontinued operations, net of income taxes			0		0
Net income (loss) attributable to GCP shareholders			$ 0.6		$ 1.2
Basic earnings (loss) per share:
Net (loss) 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
Net income (loss) attributable to GCP shareholders (in usd per share)			$ 0.01		$ 0.01
Weighted average number of basic shares (in shares)					0
Diluted earnings (loss) per share:
Income (loss) 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
Net income (loss) attributable to GCP shareholders (in usd per share)			$ 0.01		$ 0.01
Weighted average number of diluted shares (in shares)					0
[1]	Dilutive effect is only applicable to the periods during which GCP generated net income from continuing operations.
[2]	Amounts may not sum due to rounding.

Revisions of Previously Issue_4

Revisions of Previously Issued Consolidated Financial Statements - Consolidated Statements of Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ 10.3	$ (0.6)	$ 11.9	$ 1.2
Other comprehensive income:
Defined benefit pension and other postretirement plans, net of income taxes	0.1	0	0.1	0.1
Currency translation adjustments, net of income taxes	4.9	4.9	(3.1)	(28.9)
(Loss) gain from hedging activities, net of income taxes	0	(0.1)	0	0.1
Total other comprehensive income (loss)	5	4.8	(3)	(28.7)
Comprehensive income (loss)	15.3	4.2	8.9	(27.5)
Less: Comprehensive income attributable to noncontrolling interests	(0.1)	(0.1)	(0.2)	(0.2)
Comprehensive income (loss) attributable to GCP shareholders	$ 15.2	4.1	$ 8.7	(27.7)
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		(1.2)		0
Other comprehensive income:
Defined benefit pension and other postretirement plans, net of income taxes				0.1
Currency translation adjustments, net of income taxes		4.9		(28.9)
(Loss) gain from hedging activities, net of income taxes		(0.1)		0.1
Total other comprehensive income (loss)		4.8		(28.7)
Comprehensive income (loss)		3.6		(28.7)
Less: Comprehensive income attributable to noncontrolling interests		(0.1)		(0.2)
Comprehensive income (loss) attributable to GCP shareholders		3.5		(28.9)
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		0.6		1.2
Other comprehensive income:
Defined benefit pension and other postretirement plans, net of income taxes				0
Currency translation adjustments, net of income taxes		0		0
(Loss) gain from hedging activities, net of income taxes		0		0
Total other comprehensive income (loss)		0		0
Comprehensive income (loss)		0.6		1.2
Less: Comprehensive income attributable to noncontrolling interests		0		0
Comprehensive income (loss) attributable to GCP shareholders		$ 0.6		$ 1.2

Revisions of Previously Issue_5

Revisions of Previously Issued Consolidated Financial Statements - Consolidated Statements of Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Beginning balance	$ 650.6	$ 509.9	$ 654.1		$ 541
Net income (loss)	10.3	(0.6)	11.9		1.2
Share-based compensation	2.6	2.3	4	[1]	2.8
Exercise of stock options	2.1	0.3	4.3	[2]	0.7	[2]
Share repurchases	(0.9)		(1.6)	[3]	(0.3)	[3]
Dividends and other changes in non-controlling interest					(0.4)
Other comprehensive loss	5	4.8	(3)		(28.7)
Ending balance	$ 669.7	516.3	$ 669.7		516.3
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Beginning balance					541.1
Net income (loss)		(1.2)			0
Share-based compensation					2.8
Exercise of stock options					0.7
Share repurchases					(0.3)
Dividends and other changes in non-controlling interest					(0.4)
Other comprehensive loss		4.8			(28.7)
Ending balance		515.2			515.2
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Beginning balance					(0.1)
Net income (loss)		0.6			1.2
Share-based compensation					0
Exercise of stock options					0
Share repurchases					0
Dividends and other changes in non-controlling interest					0
Other comprehensive loss		0			0
Ending balance		$ 1.1			$ 1.1
[1]	During the six months ended June 30, 2021, $0.9 million of the stock-based compensation expense is included in "Restructuring expenses and asset write offs" related to accelerated vesting of stock options, RSUs and PBUs.
[2]	The par value of common shares issued may not be included in the table due to rounding. Total share amounts for common stock and treasury stock may not sum due to rounding.
[3]	Relates to shares withheld for tax payments on exercise of stock options and vesting of RSUs and PBUs. Refer to Note 14, “Stock Incentive Plans”, for further information.

Revisions of Previously Issue_6

Revisions of Previously Issued Consolidated Financial Statements - Consolidated Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
Net income (loss)	$ 10.3	$ (0.6)	$ 11.9	$ 1.2
Less: Loss from discontinued operations	(0.2)	0	(0.2)	(0.3)
Income from continuing operations	$ 10.5	(0.6)	12.1	1.5
Reconciliation to net cash provided by operating activities:
Depreciation and amortization			22.4	22.7
Amortization of debt discount and financing costs			0.8	0.7
Stock-based compensation expense			2.5	2.3
Unrealized (gain) loss on foreign currency			(2.1)	1.6
Deferred income taxes			(1.6)	(5.4)
Loss on disposal of property and equipment			1.5	0.1
Changes in assets and liabilities, excluding effect of currency translation:
Trade accounts receivable			0.4	30.3
Inventories			(30.7)	(5.1)
Accounts payable			20.3	(13.5)
Pension assets and liabilities, net			1.8	1.6
Other assets and liabilities, net			(6.4)	(16.9)
Net cash provided by operating activities from continuing operations			21	19.9
Net cash used in operating activities from discontinued operations			(0.2)	(2.3)
Net cash provided by operating activities			20.8	17.6
INVESTING ACTIVITIES
Capital expenditures			(14.9)	(18.8)
Other investing activities			0.1	0.4
Net cash used in investing activities			(14.8)	(18.4)
FINANCING ACTIVITIES
Payments on finance lease obligations			(0.3)	(0.4)
Payments of tax withholding obligations related to employee equity awards			(1.6)	(0.3)
Proceeds from exercise of stock options			4.3	0.7
Payments of dividends to noncontrolling interests				(0.4)
Net cash provided by (used in) financing activities from continuing operations			2.1	(0.4)
Effect of currency exchange rate changes on cash and cash equivalents				(5.6)
Increase (decrease) in cash and cash equivalents			$ 6.2	(6.8)
Cash and cash equivalents, beginning of period				325
Cash and cash equivalents, end of period		318.2		318.2
Supplemental disclosure of non-cash investing activities:
Property and equipment purchases unpaid and included in accounts payable				5.3
As Previously Reported
OPERATING ACTIVITIES
Net income (loss)		(1.2)		0
Less: Loss from discontinued operations		0		(0.3)
Income from continuing operations		(1.2)		0.3
Reconciliation to net cash provided by operating activities:
Depreciation and amortization				22.7
Amortization of debt discount and financing costs				0.7
Stock-based compensation expense				2.3
Unrealized (gain) loss on foreign currency				1.6
Deferred income taxes				(5.8)
Loss on disposal of property and equipment				0.1
Changes in assets and liabilities, excluding effect of currency translation:
Trade accounts receivable				30.3
Inventories				(5.1)
Accounts payable				(13.5)
Other assets and liabilities, net				(15.3)
Net cash provided by operating activities from continuing operations				19.9
Net cash used in operating activities from discontinued operations				(2.3)
Net cash provided by operating activities				17.6
INVESTING ACTIVITIES
Capital expenditures				(18.8)
Other investing activities				0.4
Net cash used in investing activities				(18.4)
FINANCING ACTIVITIES
Payments on finance lease obligations				(0.4)
Payments of tax withholding obligations related to employee equity awards				(0.3)
Proceeds from exercise of stock options				0.7
Payments of dividends to noncontrolling interests				(0.4)
Net cash provided by (used in) financing activities from continuing operations				(0.4)
Effect of currency exchange rate changes on cash and cash equivalents				(5.6)
Increase (decrease) in cash and cash equivalents				(6.8)
Cash and cash equivalents, beginning of period				325
Cash and cash equivalents, end of period		318.2		318.2
Supplemental disclosure of non-cash investing activities:
Property and equipment purchases unpaid and included in accounts payable				5.3
Adjustments
OPERATING ACTIVITIES
Net income (loss)		0.6		1.2
Less: Loss from discontinued operations		0		0
Income from continuing operations		0.6		1.2
Reconciliation to net cash provided by operating activities:
Depreciation and amortization				0
Amortization of debt discount and financing costs				0
Stock-based compensation expense				0
Unrealized (gain) loss on foreign currency				0
Deferred income taxes				0.4
Loss on disposal of property and equipment				0
Changes in assets and liabilities, excluding effect of currency translation:
Trade accounts receivable				0
Inventories				0
Accounts payable				0
Pension assets and liabilities, net				0
Other assets and liabilities, net				(1.6)
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
Other investing activities				0
Net cash used in investing activities				0
FINANCING ACTIVITIES
Payments on finance lease obligations				0
Payments of tax withholding obligations related to employee equity awards				0
Proceeds from exercise of stock options				0
Payments of dividends to noncontrolling interests				0
Net cash provided by (used in) financing activities from continuing operations				0
Effect of currency exchange rate changes on cash and cash equivalents				0
Increase (decrease) in cash and cash equivalents				0
Cash and cash equivalents, beginning of period				0
Cash and cash equivalents, end of period		$ 0		0
Supplemental disclosure of non-cash investing activities:
Property and equipment purchases unpaid and included in accounts payable				$ 0