GCP Applied (GCP) 10-Q 9 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 02, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	GCP Applied Technologies Inc.
Entity Central Index Key	1,644,440
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		71,043,787
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net sales	$ 342.5	$ 389.7	$ 1,022.9	$ 1,086.1
Cost of goods sold	206.5	245.8	617.3	688
Gross profit	136	143.9	405.6	398.1
Selling, general and administrative expenses	75	72.9	220.4	217.5
Research and development expenses	5.9	5.6	17.1	16.8
Interest expense and related financing costs	18.8	0.3	49	1.1
Interest expense, net - related party	0	0.3	0	0.7
Loss in Venezuela	0	59.6	0	59.6
Other (income) expense, net	(0.5)	1.1	3.3	1.3
Total costs and expenses	104.9	142.1	305.5	306.9
Income before income taxes	31.1	1.8	100.1	91.2
Provision for income taxes	(9.6)	(16.8)	(29.8)	(58.2)
Net income (loss)	21.5	(15)	70.3	33
Less: net income attributable to noncontrolling interests	(0.2)	(0.3)	(0.9)	(0.6)
Net income (loss) attributable to GCP shareholders	$ 21.3	$ (15.3)	$ 69.4	$ 32.4
Basic earnings per share:
Net income (loss) attributable to GCP shareholders (in usd per share)	$ 0.30	$ (0.22)	$ 0.98	$ 0.46
Weighted average number of basic shares	71	70.5	70.8	70.5
Diluted earnings per share:
Net income (loss) attributable to GCP shareholders (in usd per share)	$ 0.30	$ (0.22)	$ 0.97	$ 0.46
Weighted average number of diluted shares	72.2	70.5	71.6	70.5
Repositioning
Restructuring expenses	$ 5.3	$ 0	$ 14.3	$ 0
Restructuring
Restructuring expenses	$ 0.4	$ 2.3	$ 1.4	$ 9.9

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 148.5	$ 98.6
Trade accounts receivable, less allowance of $5.9 (2015—$6.2)	244	203.6
Inventories	117.3	105.3
Other current assets	47	38.9
Total Current Assets	556.8	446.4
Properties and equipment, net	226.1	197.1
Goodwill	107.6	102.5
Technology and other intangible assets, net	34.8	33.3
Deferred income taxes	83.1	17.6
Overfunded defined benefit pension plans	24.4	26.1
Other assets	28.2	10.1
Total Assets	1,061	833.1
Current Liabilities
Debt payable within one year	23.2	25.7
Accounts payable	118.1	109
Loans payable - related party	0	42.3
Other current liabilities	133	125.5
Total Current Liabilities	274.3	302.5
Debt payable after one year	783.4	0
Deferred income taxes	9.1	8.7
Unrecognized tax benefits	11.6	5.2
Underfunded and unfunded defined benefit pension plans	82.8	34
Other liabilities	18.2	8.6
Total Liabilities	1,179.4	359
Commitments and Contingencies - Note 7
Stockholders' (Deficit) Equity
Net parent investment	0	598.3
Common stock issued, par value $0.01; 300,000,000 shares authorized; outstanding: 71,030,386	0.7	0
Accumulated earnings	3.6	0
Accumulated other comprehensive loss	(124.8)	(127.7)
Treasury stock	(1.8)	0
Total GCP's Shareholders' (Deficit) Equity	(122.3)	470.6
Noncontrolling interests	3.9	3.5
Total Stockholders' (Deficit) Equity	(118.4)	474.1
Total Liabilities and Stockholders' (Deficit) Equity	$ 1,061	$ 833.1

Consolidated Balance Sheets (u4

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Trade accounts receivable, allowance	$ 5.9	$ 6.2
Common stock issued, par value (in usd per share)	$ 0.01
Common stock, number of shares authorized	300,000,000
Common stock, number of shares outstanding	71,030,386

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 21.5	$ (15)	$ 70.3	$ 33
Other comprehensive income (loss):
Defined benefit pension and other postretirement plans, net of income taxes	0	0	(0.5)	0
Currency translation adjustments	3	(19.7)	3.5	(39.1)
(Loss) gain from hedging activities, net of income taxes	(0.1)	0.2	(0.1)	0.2
Total other comprehensive (loss) income attributable to noncontrolling interests	0	(0.5)	0.2	(0.3)
Total other comprehensive income (loss)	2.9	(20)	3.1	(39.2)
Comprehensive income (loss)	24.4	(35)	73.4	(6.2)
Less: Comprehensive (income) loss attributable to noncontrolling interests	(0.2)	0.2	(1.1)	(0.3)
Comprehensive income (loss) attributable to GCP shareholders	$ 24.2	$ (34.8)	$ 72.3	$ (6.5)

Consolidated Statements of (Def

Consolidated Statements of (Deficit) Equity (unaudited) - USD ($) $ in Millions	Total	Common Stock	Accumulated Earnings (Deficit)	Treasury Stock	Net Parent Investment	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning balance at Dec. 31, 2014	$ 607.4				$ 670.6	$ (66)	$ 2.8
Increase (Decrease) in Stockholders' Equity
Net income	33				32.4		0.6
Other comprehensive income (loss)	(39.2)					(38.9)	(0.3)
Net transfer (to) from parent	(96.1)				(96.1)
Ending balance at Sep. 30, 2015	505.1				606.9	(104.9)	3.1
Beginning balance at Dec. 31, 2015	474.1	$ 0	$ 0	$ 0	598.3	(127.7)	3.5
Increase (Decrease) in Stockholders' Equity
Net income	70.3		62.2		7.2		0.9
Other comprehensive income (loss)	3.1					2.9	0.2
Net transfer (to) from parent	(672.2)				(672.2)
Reclassification of net parent investment in connection with Separation	0	0.7	(67.4)		66.7
Share based compensation	4.7		4.7
Exercise of stock options	4.1		4.1
Treasury stock purchased under GCP 2016 Stock Incentive Plan	(1.8)			(1.8)
Noncontrolling interest dividend	(0.7)						(0.7)
Ending balance at Sep. 30, 2016	$ (118.4)	$ 0.7	$ 3.6	$ (1.8)	$ 0	$ (124.8)	$ 3.9

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES
Net income	$ 70.3	$ 33
Reconciliation to net cash provided by operating activities:
Depreciation and amortization	27	24.4
Amortization of debt discount and financing costs	2	0
Stock-based compensation expense	5	2.8
Gain on termination and curtailment of pension and other postretirement plans	(2.6)	0
Currency and other losses in Venezuela	4.2	73.2
Deferred income taxes	2.2	(7.3)
Excess tax benefits from stock-based compensation	0	(2.8)
Loss on disposal of property and equipment	0.5	3.9
Changes in assets and liabilities, excluding effect of currency translation:
Trade accounts receivable	(37)	(51.7)
Inventories	(10.9)	(13.2)
Accounts payable	9.4	17.1
Pension assets and liabilities, net	3.4	(0.6)
Other assets and liabilities, net	(0.5)	23.1
Net cash provided by operating activities	73	101.9
INVESTING ACTIVITIES
Capital expenditures	(33.3)	(26.2)
Receipt of payment on loan from related party	0	40
Other investing activities	0.5	0.4
Net cash (used in) provided by investing activities	(32.8)	14.2
FINANCING ACTIVITIES
Borrowings under credit arrangements	294.3	27.6
Repayments under credit arrangements	(30.7)	(41)
Borrowings under related party loans	0	2.1
Repayments under related party loans	0	(5.9)
Proceeds from issuance of bonds	525	0
Cash paid for debt financing costs	(18.2)	0
Share repurchase under GCP 2016 Stock Incentive Plan	(1.8)	0
Proceeds from exercise of stock options	3.8	0
Excess tax benefits from stock-based compensation	0	2.8
Noncontrolling interest dividend	(0.7)	0
Transfers to parent, net	(764.6)	(69.6)
Net cash provided by (used in) financing activities	7.1	(84)
Effect of currency exchange rate changes on cash and cash equivalents	2.6	(53.1)
Increase (decrease) in cash and cash equivalents	49.9	(21)
Cash and cash equivalents, beginning of period	98.6	120.9
Cash and cash equivalents, end of period	$ 148.5	$ 99.9

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies	9 Months Ended
	Sep. 30, 2016
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 On January 27, 2016, GCP entered into a Separation and Distribution Agreement pursuant to which Grace agreed to transfer its Grace Construction Products operating segment and the packaging technologies business, operated under the “Darex” name, of its Grace Materials Technologies operating segment to GCP (the "Separation"). The Separation occurred on February 3, 2016, by means of a pro rata distribution to Grace stockholders of all of the then-outstanding shares of Company common stock (the "Distribution"). Under the Distribution, one share of Company common stock was distributed for each share of Grace common stock held by Grace stockholders of record as of the close of business on January 27, 2016. No fractional shares were distributed. As a result of the Distribution, GCP is now an independent public company and its common stock is listed under the symbol "GCP" on the New York Stock Exchange. GCP is engaged in the production and sale of specialty construction chemicals, specialty building materials, and packaging products through three operating segments. Specialty Construction Chemicals ("SCC") manufactures and markets concrete admixtures and cement additives. 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. Darex Packaging Technologies ("Darex") manufactures and markets packaging materials for use in beverage and food containers, industrial containers and other consumer and industrial applications. Prior to the Separation, the Company operated as the Grace Construction Products operating segment and the Darex Packaging Technologies business of W.R. Grace & Co. The Separation was completed pursuant to various agreements with Grace related to the Separation. These agreements govern the relationship between GCP and Grace following the Separation and provided for the allocation of various assets, liabilities, rights and obligations. These agreements also include arrangements for transition services to be provided on a temporary basis by both parties. Basis of Presentation The financial statements for periods prior to the Separation have been prepared on a stand-alone basis and are derived from the consolidated financial statements and accounting records of Grace, as the Company's business operated as a combination of entities under common control of Grace. These financial statements reflect the historical basis and carrying values established when the Company was part of Grace. Subsequent to the Separation, the accompanying Consolidated Financial Statements are presented on a consolidated basis and include all of the accounts and operations of GCP and its majority-owned subsidiaries. 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 of America ("GAAP") and with the instructions to Form 10-Q and Article 10 of SEC Regulation S-X for interim financial information. The interim financial statements presented herein are unaudited and should be read in conjunction with the Combined Financial Statements presented in the Company's 2015 Annual Report on Form 10-K. Such 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 as discussed below. All significant intercompany accounts and transactions have been eliminated. The results of operations for the nine-month interim period ended September 30, 2016 are not necessarily indicative of the results of operations for the year ending December 31, 2016 . All transactions between GCP and Grace have been included in these financial statements. Prior to the Separation, all such transactions, other than intercompany loan transactions, are effectively considered to be settled for cash, in the Combined Financial Statements at the time the transactions were recorded . The intercompany loans payable to Grace and the related interest and cash flows, as presented in Note 3 are reflected as "Borrowings under related party loans" and "Repayments under related party loans" in the Statements of Cash Flows, as "Loans payable-related party" in the Balance Sheets and as "Interest expense, net-related party" in the Statements of Operations. Subsequent to the Separation, Grace is no longer a related party of the Company. Prior to the Separation, the financial statements included expenses of Grace allocated to GCP for certain functions provided by Grace, including, but not limited to, general corporate expenses related to finance, legal, information technology, human resources, communications, ethics and compliance, environment health and safety, supply chain, shared services, employee benefits and incentives, insurance and stock-based compensation. These expenses were allocated to GCP on the basis of direct usage when identifiable, with the remainder allocated on the basis of revenue, headcount or other measures. These cost allocations were included in selling, general and administrative expenses in the Statement of Operations. Most of these costs were included in segment operating income with only a portion included in corporate costs. Both GCP and Grace consider the basis on which the expenses have been allocated to be a reasonable reflection of the utilization of services provided to, or the benefit received by, GCP during the periods presented. Subsequent to the Separation, GCP has performed most of these functions using its own resources or purchased services. However, the remainder of these functions will continue to be provided by Grace under a transition services agreement, for a period generally up to 18 months from the Separation. See Note 12 for further description of the transition services agreement between GCP and Grace. Prior to the Separation, the financial statements also included the assets and liabilities that were historically held at the Grace corporate level but were specifically identifiable or otherwise pushed down to GCP. The cash and cash equivalents held by Grace at the corporate level were not specifically identifiable to GCP and therefore were not allocated to GCP for any of the periods presented. Prior to the Separation, cash and cash equivalents in the Balance Sheets represent primarily cash held locally by entities included in the financial statements. Third-party debt and the related interest expense of Grace were not allocated to GCP for any of the periods presented as GCP was not the legal obligor of the debt and the Grace borrowings were not directly attributable to GCP's business. The financial statements exclude all assets, liabilities, income, gains, costs and expenses reported by Grace related to asbestos and bankruptcy matters. Prior to the Separation, these matters were not allocated to GCP as Grace was the legal obligor for those liabilities and Grace is expected to pay all future liabilities and costs related to such matters as such matters were not historically managed by GCP. Grace retained full responsibility for these matters following the Separation and GCP has not indemnified Grace for any losses or payments associated with these matters. Prior to the Separation, Grace used a centralized approach to cash management and financing of its operations and Grace funded GCP's operating and investing activities as needed. Prior to the Separation, cash transfers to and from the cash management accounts of Grace are reflected in the Statements of Cash Flows as “Transfers (to) from parent, net.” Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses for the periods presented. Actual amounts could differ from those estimates, and the differences could be material. Changes in estimates are recorded in the period identified. GCP's accounting measurements that are most affected by management's estimates of future events are: • Contingent liabilities, which depend on an assessment of the probability of loss and an estimate of ultimate resolution cost, that may arise from circumstances such as legal disputes, environmental remediation, product liability claims, material commitments (see Note 7 to the Consolidated Financial Statements) and income taxes (see Note 4 to the Consolidated Financial Statements); • Pension and postretirement liabilities that depend on assumptions regarding participant life spans, future inflation, discount rates and total returns on invested funds (see Note 5 to the Consolidated Financial Statements); and • Realization values of net deferred tax assets, which depend on projections of future taxable income (see Note 4 to the Consolidated Financial Statements). 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. Certain amounts within "Net cash provided by operating activities" in the Company’s Consolidated Statement of Cash Flows for the nine months ended September 30, 2015 have been reclassified to conform to current period presentation. These reclassifications had no effect on the previously reported cash flows from operating, investing and financing activities. Income Tax As a global enterprise, GCP is subject to a complex array of tax regulations and must make assessments of applicable tax law and judgments in estimating its ultimate income tax liability. In the financial statements for periods prior to the Separation, income tax expense and tax balances were calculated using the separate return method as if GCP was a separate taxpayer, although GCP was included in tax returns filed by Grace. After the Separation, income tax expense and income tax balances represent GCP’s federal, state and foreign income taxes as an independent company. As a stand-alone entity, GCP will file tax returns on its own behalf and its deferred taxes and effective tax rate may not be comparable to those of historical periods prior to the Separation. See Note 4 for details regarding estimates used in accounting for income tax matters including unrecognized tax benefits. Stock-Based Compensation Expense Prior to the Separation, GCP was allocated stock-based compensation expense from Grace related to GCP employees receiving awards denominated in Grace equity instruments. In accordance with an employee matters agreement entered into between Grace and GCP on January 27, 2016 in connection with the Separation (the "Employee Matters Agreement"), previously outstanding stock-based compensation awards granted under Grace's equity compensation programs prior to the Separation and held by certain executives and employees of GCP and Grace were adjusted to reflect the impact of the Separation on these awards. To preserve the aggregate intrinsic value of these stock-based compensation awards, as measured immediately before and immediately after the Separation, each holder of Grace stock-based compensation awards generally received an adjusted award consisting of either (i) both a stock-based compensation award denominated in Grace equity as it existed subsequent to the Separation and a stock-based compensation award denominated in GCP equity or (ii) solely a stock-based compensation award denominated in the equity of the company at which the person was employed following the Separation. In the Separation, the determination as to which type of adjustment applied to a holder’s previously outstanding Grace award was based upon the type of stock-based compensation award that was to be adjusted and the date on which the award was originally granted under the Grace equity compensation programs prior to the Separation. Under the Employee Matters Agreement, GCP retains certain obligations related to all stock- and cash-settled stock-based compensation awards denominated in GCP equity, regardless of whether the holder is a GCP or Grace employee. Following the Separation, the Company records stock-based compensation expense for equity awards in accordance with authoritative accounting guidance. Currency Translation Assets and liabilities of foreign subsidiaries (other than those located in countries with highly inflationary economies) are translated into U.S. dollars at current exchange rates, while revenues, costs and expenses are translated at average exchange rates during each reporting period. The resulting currency translation adjustments are included in accumulated other comprehensive loss in the Consolidated Balance Sheets. The financial statements of any subsidiaries located in countries with highly inflationary economies are remeasured as if the functional currency were the U.S. dollar; the remeasurement creates translation adjustments that are reflected in net income in the Consolidated Statements of Operations. Effective January 1, 2010, GCP began to account for its Venezuela subsidiary as a highly inflationary economy. As a result, the functional currency of its Venezuelan subsidiary became the U.S. dollar; therefore, all translation adjustments are reflected in net income in the accompanying Consolidated Statements of Operations. The official exchange rate (CENCOEX) of 4.3 was used to remeasure GCP's financial statements from bolivars to U.S. dollars upon Venezuela's designation as a highly inflationary economy. On February 8, 2013, the Venezuelan government announced that, effective February 13, 2013, the official exchange rate of the bolivar to U.S. dollar would devalue from 4.3 to 6.3 . GCP continued to account for its results in Venezuela at the official exchange rate of 6.3 bolivars to one U.S. dollar until September 30, 2015. Based on developments in the third quarter of 2015, including changed expectations about GCP's ability to import raw materials into Venezuela at the official exchange rate and increased inflation, the Company determined that it was no longer appropriate to use the official exchange rate. Effective September 30, 2015, the Company began accounting for its results in Venezuela at the SIMADI rate. The Company recorded a pre-tax charge of $73.2 million in the third quarter of 2015 to reflect the devaluation of monetary assets and the impairment of non-monetary assets at the SIMADI rate of 199 bolivars to one U.S. dollar. We recorded $13.7 million of this amount related to inventory to cost of goods sold and $59.6 million related to other assets and liabilities as a separate line item in our Consolidated Statement of Operations, referred to as "Loss in Venezuela." In mid-February 2016, changes to the currency exchange systems were announced that eliminated the SICAD exchange rate and replaced the name SIMADI rate with DICOM, a floating exchange rate. The DICOM rate of 654 bolivars to one U.S. dollar at September 30, 2016 has increased approximately 230% from the rate at December 31, 2015. Accordingly, the Company has recorded a $4.2 million loss within "Other (income) expense, net" in its Consolidated Statement of Operations for the nine months ended September 30, 2016 to reflect the remeasurement of its Venezuela subsidiary's financial statements to U.S. dollars. Recently Issued Accounting Standards Statement of Cash Flows In August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Payments, which addresses eight specific cash flow presentation issues with the objective of reducing existing diversity in practice. ASU 2016-15 is effective for the Company on January 1, 2018 and requires a retrospective approach to adoption. GCP is currently evaluating the potential impact on its Consolidated Financial Statements and related disclosures. Revenue from Contracts with Customers In May 2016, the FASB issued ASU 2016-12, Narrow-Scope Improvements and Practical Expedients, which clarifies aspects of ASU 2014-09, Revenue from Contracts with Customers (Topic 606) , including non-cash consideration, and provides a practical expedient for reflecting contract modifications upon transition. The Company is currently evaluating the impact of adopting ASU 2016-12, which will occur in conjunction with its adoption of the new revenue recognition standard promulgated in Topic 606. ASU 2014-09 is effective for the Company on January 1, 2018, with early adoption permitted as of January 1, 2017, and requires either a retrospective or a modified retrospective approach to adoption. GCP is currently evaluating the available transition methods and the potential impact of the new revenue recognition standard on its Consolidated Financial Statements and related disclosures. In April 2016, the FASB issued ASU 2016-10, Identifying Performance Obligations and Licensing , which clarifies aspects of ASU 2014-09 pertaining to the identification of performance obligations and the licensing implementation guidance, while retaining the core principles for those areas. GCP is currently evaluating the impact of adopting ASU 2016-10, which will occur in conjunction with its adoption of Topic 606. In March 2016, the FASB issued ASU 2016-08, Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net) , which amends the principal-versus-agent implementation guidance in Topic 606 and will affect whether an entity reports revenue on a gross or net basis. GCP is currently evaluating the impact of adopting ASU 2016-08, which will occur in conjunction with its adoption of Topic 606. Leases In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) , which is intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The core principle of Topic 842 is that a lessee should recognize the assets and liabilities that arise from leases. A lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term, including optional payments where they are reasonably certain to occur. The amendments in this update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. GCP is currently evaluating the potential impact on its Consolidated Financial Statements and related disclosures. Recently Adopted Accounting Standards Accounting for Stock Compensation In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting . The updated standard is intended to simplify several areas of accounting for share-based compensation arrangements, including the income tax impact, classification on the statement of cash flows and forfeitures. The update requires that excess tax benefits and deficiencies be recorded in the income statement when the awards vest or are settled. It also eliminates the requirement that excess tax benefits be realized (reduce cash taxes payable) before being recognized. Previously, an entity could not recognize excess tax benefits if the tax deduction increased a net operating loss ("NOL") or tax credit carryforward. The updated standard no longer requires cash flows related to excess tax benefits to be presented as a financing activity separate from other income tax cash flows. The update also allows entities to repurchase more of an employee's shares for tax withholding purposes without triggering liability accounting, clarifies that all cash payments to taxing authorities made on an employee's behalf for withheld shares should be presented as a financing activity on the statement of cash flows, and provides for an accounting policy election to account for forfeitures as they occur. The update is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods, with early adoption permitted. GCP elected to early adopt this update in the 2016 third quarter and now recognizes excess tax benefits in the provision for income taxes rather than paid-in capital. Adoption of the update resulted in the recognition of excess tax benefits in the provision for income taxes of $0.8 million , $0.2 million and $0.9 million for the three month periods ended March 31, 2016, June 30, 2016 and September 30, 2016, respectively; $1.0 million for the six months ended June 30, 2016; and $1.9 million for the nine months ended September 30, 2016. GCP has elected to continue to estimate forfeitures expected to occur to determine the amount of compensation expense to be recognized each period. The presentation requirements for cash flows related to excess tax benefits resulted in an increase in cash provided by operating activities of $0.8 million and $1.0 million (with a corresponding reduction of cash provided by financing activities) for the three months ended March 31, 2016 and the six months ended June 30, 2016, respectively. The tables below summarize the effects of the adoption of this update on GCP's previously reported results for the 2016 first and second quarters and for the six months ended June 30, 2016. Consolidated Statement of Operations Three Months Ended March 31, 2016 Three Months Ended June 30, 2016 Six Months Ended June 30, 2016 (In millions, except per share amounts) Previously Reported Revised Effect of Change Previously Reported Revised Effect of Change Previously Reported Revised Effect of Change Provision for income taxes $ (8.4 ) $ (7.6 ) $ 0.8 $ (12.8 ) $ (12.6 ) $ 0.2 $ (21.2 ) $ (20.2 ) $ 1.0 Net income 17.4 18.2 0.8 30.4 30.6 0.2 47.8 48.8 1.0 Net income attributable to GCP shareholders 17.0 17.8 0.8 30.1 30.3 0.2 47.1 48.1 1.0 Basic earnings per share: Net income attributable to GCP shareholders $ 0.24 $ 0.25 $ 0.01 $ 0.43 $ 0.43 $ — $ 0.67 $ 0.68 $ 0.01 Diluted earnings per share: Net income attributable to GCP shareholders $ 0.24 $ 0.25 $ 0.01 $ 0.42 $ 0.42 $ — $ 0.66 $ 0.67 $ 0.01 Weighted average number of diluted shares 70.9 70.9 — 71.4 71.7 0.3 71.2 71.3 0.1 Consolidated Statement of Cash Flows Three Months Ended Six Months Ended (In millions) Previously Reported Revised Effect of Change Previously Reported Revised Effect of Change Net cash provided by operating activities $ 23.7 $ 24.5 $ 0.8 $ 52.0 $ 53.0 $ 1.0 Net cash provided by financing activities 15.6 14.8 (0.8 ) 9.2 8.2 (1.0 )

Inventories

Inventories	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories are stated at the lower of cost or market, GCP determines cost using the first-in, first-out ("FIFO") methodology. Inventories presented on GCP's Consolidated Balance Sheets consisted of the following: (In millions) September 30, December 31, Raw materials $ 46.7 $ 39.1 In process 6.4 6.2 Finished products and other 64.2 60.0 Total inventories $ 117.3 $ 105.3 Included above as "other" within "Finished products and other" are finished products purchased rather than produced by GCP of $10.2 million and $8.6 million as of September 30, 2016 and December 31, 2015 , respectively.

Debt and Other Financial Instru

Debt and Other Financial Instruments	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Debt and Other Financial Instruments	Debt and Other Financial Instruments Components of Debt (In millions) September 30, December 31, 9.5% Senior Notes due 2023, net of unamortized debt issuance costs of $7.5 at September 30, 2016 $ 517.5 $ — Term Loan due 2022, net of unamortized discount of $2.5 and unamortized debt issuance costs of $4.5 at September 30, 2016 (1) 266.6 — Related party — 42.3 Other borrowings (2) 22.5 25.7 Total debt 806.6 68.0 Less debt payable within one year 23.2 68.0 Debt payable after one year $ 783.4 $ — Weighted average interest rates on related party debt — % 3.3 % Weighted average interest rates on total debt 7.6 % 11.9 % __________________________ (1) Interest at LIBOR + 325 bps with a 75 bps LIBOR floor at September 30, 2016 . (2) Represents borrowings under various lines of credit and other borrowings, primarily by non-U.S. subsidiaries. The principal maturities of debt outstanding (net of unamortized discounts and debt issuance costs) at September 30, 2016 , were as follows: (In millions) 2016 $ 17.7 2017 6.4 2018 3.4 2019 3.4 2020 3.4 Thereafter 772.3 Total debt $ 806.6 Credit Agreement On February 3, 2016, GCP entered into a credit agreement (the “Credit Agreement”) that provides for new senior secured credit facilities (the “Credit Facilities”) in an aggregate principal amount of $525.0 million , consisting of: (a) term loan (the “Term Loan”) in an aggregate principal amount of $275.0 million maturing in 2022; and (b) $250.0 million revolving credit facility (the "Revolving Loan") due in 2021. The Term Loan principal balance is scheduled to be repaid in equal quarterly installments in aggregate annual amounts equal to 1.0% of the original principal amount. The Credit Agreement contains customary affirmative covenants, including, but not limited to (i) maintenance of legal existence and compliance with laws and regulations; (ii) delivery of consolidated financial statements and other information; (iii) payment of taxes; (iv) delivery of notices of defaults and certain other material events; and (v) maintenance of adequate insurance. The Credit Agreement also contains customary negative covenants, including but not limited to restrictions on (i) dividends on, and redemptions of, equity interests and other restricted payments; (ii) liens; (iii) loans and investments; (iv) the sale, transfer or disposition of assets and businesses; (vi) transactions with affiliates; and (vii) a maximum total leverage ratio. Certain debt covenants may restrict the entity's ability as it relates to dividends, acquisitions and other borrowings. The Credit Agreement contains conditions that would require mandatory principal payments in advance of the maturity date of the Term Loan and Revolving Credit Facility; the Company was in compliance with all terms as of September 30, 2016 . Events of default under the Credit Agreement include, but are not limited to: (i) failure to pay principal, interest, fees or other amounts under the Credit Agreement when due, taking into account any applicable grace period; (ii) any representation or warranty proving to have been incorrect in any material respect when made; (iii) failure to perform or observe covenants or other terms of the Credit Agreement subject to certain grace periods; (iv) a cross-default and cross-acceleration with certain other material debt; (v) bankruptcy events; (vi) certain defaults under ERISA; and (vii) the invalidity or impairment of security interests. There are no events of default as of September 30, 2016 . The Credit Facilities are secured on a first priority basis by a perfected security interest in, and mortgages on, substantially all tangible and intangible personal property and material fee-owned real property (including properties in Chicago, Illinois and Mount Pleasant, Tennessee) of the Company, a pledge of 100% of the equity of each material U.S. subsidiary of the Company and 65% of the equity of the United Kingdom holding company. On August 25, 2016, GCP refinanced the existing Credit Agreement with a syndicate of banks (the “Amended Credit Agreement”). The Amended Credit Agreement reduced the interest rate margins applicable to the Term Loan from base rate plus a margin of 3.5% or LIBOR plus a margin of 4.5% to a base rate plus a margin of 2.25% or LIBOR plus a margin of 3.25% at GCP’s option. The $274.3 million outstanding principal balance was replaced by a like aggregate $274.3 million principal balance with substantially similar terms to the Credit Agreement. In conjunction with the refinancing, the Company recognized accelerated amortization of $0.1 million for a portion of the associated previously deferred debt issuance costs and expensed $1.2 million of related third-party financing costs. These amounts are included in "Interest expense and related financing costs" in the Consolidated Statement of Operations for the three and nine months ended September 30, 2016. The interest rate per annum applicable to the Revolving Loan is equal to, at GCP’s option, either a base rate plus a margin ranging from 0.5% to 1.0% or LIBOR plus a margin ranging from 1.5% to 2.0% , in either case based upon the total leverage ratio of GCP and its restricted subsidiaries. GCP had no outstanding draws on the Revolving Loan as of September 30, 2016 ; however, the available credit under that facility was reduced to $244.0 million by approximately $6 million in outstanding letters of credit. Senior Notes On January 27, 2016, GCP issued $525.0 million aggregate principal amount of 9.5% Senior Notes due 2023 (the “Notes”). Interest is payable semi-annually in arrears on February 1 and August 1 of each year, commencing on August 1, 2016. The Notes were issued subject to covenants that limit the Company's and certain of its subsidiaries’ ability, subject to certain exceptions and qualifications, to (i) create or incur liens on assets, (ii) incur additional debt (iii) sell certain assets (iv) make certain investments and acquisitions, merge or sell or otherwise dispose of all or substantially all assets. During the first quarter 2016, GCP incurred debt issuance costs relating to issuance of the Notes, Term Loan, and Revolving Loan of $8.0 million , $5.0 million and $5.2 million , respectively. GCP deducted the debt issuance costs relating to the Notes and the Term Loan from the carrying amounts presented on its Consolidated Balance Sheet and is amortizing those costs over the terms of the underlying obligations. GCP classified debt issuance costs relating to the Revolving Loan in "Other assets" on its Consolidated Balance Sheet and is amortizing those costs over the term of the Revolving Loan. The unamortized portion of these costs as of September 30, 2016 was $4.5 million . During the first quarter 2016, GCP used certain proceeds from the Notes and Credit Facilities to fund a distribution to Grace in an amount of $750.0 million related to the Separation. Approximately $50 million was retained to meet operating requirements and to pay fees associated with the debt financing and other post-Separation costs. Related party debt of approximately $42 million and related interest was settled with Grace in connection with the Separation. Debt Fair Value At September 30, 2016 , the carrying amounts and fair values of GCP's debt were as follows: September 30, 2016 December 31, 2015 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value 9.5% Senior Notes due 2023 $ 517.5 $ 601.1 $ — $ — Term Loan due 2022 266.6 276.7 — — Other borrowings 22.5 22.5 68.0 68.0 Total debt $ 806.6 $ 900.3 $ 68.0 $ 68.0 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. The increase in fair value of the Notes since issuance was driven by favorable demands in the marketplace.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The income tax provision for the three months ended September 30, 2016 and 2015 was $9.6 million and $16.8 million , respectively, representing effective tax rates of 30.9% and 933.3% , respectively. The income tax provision for the nine months ended September 30, 2016 and 2015 was $29.8 million and $58.2 million , respectively, representing effective tax rates of 29.8% and 63.8% , respectively. The decrease in our effective tax rate for the three and nine months ended September 30, 2016 compared to the same period in 2015 was primarily due to a 2015 repatriation of foreign earnings and the nondeductible loss in Venezuela recorded in the third quarter of 2015. The early adoption of ASU 2016-09 in 2016 reduced the effective tax rate for the three months ended September 30, 2016 by 2.9 percentage points, or $0.9 million , and for the nine months ended September 30, 2016 by 1.9 percentage points, or $1.9 million . The effects of early adoption of ASU 2016-09 are further discussed in Note 1. As also discussed in Note 1, on February 3, 2016 the Separation of Grace and GCP was completed. In conjunction with the Separation, GCP has increased its deferred tax assets in the U.S. by approximately $77 million , which primarily relates to the step up in tax basis and transfer of a net pension liability. 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 the 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. As of September 30, 2016 , the Company has the intent and ability to indefinitely reinvest undistributed earnings of its foreign subsidiaries outside the United States. In 2015, Grace repatriated a total of $173.1 million of foreign earnings from foreign subsidiaries transferred to GCP pursuant to the Separation. Such amount was determined based on an analysis of each non-U.S. subsidiary's requirements for working capital, debt repayment and strategic initiatives. In 2015, on a stand-alone basis (see Basis of Presentation), GCP incurred $19.9 million in tax expense as a result of such repatriation, increasing the Company's 2015 effective tax rate by 15.9 percentage points when compared to the U.S. federal statutory rate. The tax effect of the repatriation is determined by several variables including the tax rate applicable to the entity making the distribution, the cumulative earnings and associated foreign taxes of the entity and the extent to which those earnings may have already been taxed in the U.S. GCP believes that the Separation is a one-time, non-recurring event and that recognition of deferred taxes of undistributed earnings during 2015 would not have occurred if not for the Separation. Subsequent to the Separation, GCP expects undistributed prior-year earnings of its foreign subsidiaries to remain permanently reinvested except in certain instances where repatriation of such earnings would result in minimal or no tax. GCP bases this assertion on: (1) the expectation that it will satisfy its U.S. cash obligations in the foreseeable future without requiring the repatriation of prior-year foreign earnings; (2) plans for significant and continued reinvestment of foreign earnings in organic and inorganic growth initiatives outside the U.S.; and (3) remittance restrictions imposed by local governments. GCP will continually analyze and evaluate its cash needs to determine the appropriateness of its indefinite reinvestment assertion. In connection with the Separation, GCP and Grace entered into various agreements that govern the relationship between the parties going forward, including a tax matters agreement (the "Tax Sharing Agreement"). Under the Tax Sharing Agreement, which was entered into on the distribution date, GCP and Grace will indemnify and hold each other harmless in accordance with the principles outlined therein.

Pension Plans and Other Postret

Pension Plans and Other Postretirement Benefit Plans	9 Months Ended
	Sep. 30, 2016
Pension and Other Postretirement Benefit Expense [Abstract]
Pension Plans and Other Postretirement Benefit Plans	Pension Plans and Other Postretirement Benefit Plans Multiemployer Benefit Plans Prior to the Separation, Grace sponsored funded and unfunded defined benefit pension and other postretirement benefit plans in which GCP employees and employees from other Grace businesses participated in (the “Shared Plans”). These Shared Plans were accounted for as multiemployer benefit plans. Accordingly, GCP did not record an asset or liability to recognize the funded status of these Shared Plans in the Balance Sheet prior to the Separation. In the fourth quarter of 2015 , in preparation for the Separation, certain international pension plans were legally separated resulting in an approximate $4 million increase to net pension liabilities. GCP recorded the funded status for these international plans as of December 31, 2015 . During the first quarter of 2016, certain Shared Plans in the U.S. were legally separated, resulting in an approximate $44 million increase to net pension liabilities on the Consolidated Balance Sheet as of March 31, 2016. The funded status of these plans as of September 30, 2016 is included in the Net Funded Status table below. GCP’s allocated pension expense for the Shared Plans was $2.8 million for the nine months ended September 30, 2015 . The related expense for the nine months ended September 30, 2016 is included in the Components of Net Periodic Benefit Cost (Income) table below. Postretirement Benefits Other Than Pensions Grace provided postretirement life insurance benefits for retired employees of certain U.S. business units and certain divested business units. GCP’s allocated income for these postretirement life insurance benefits plan was $1.2 million for the nine months ended September 30, 2015 . In the first quarter of 2016, the postretirement life insurance benefits plan liability related to GCP employees who were participants in this plan at the time of Separation was legally transferred to GCP, resulting in an increase of $0.1 million to other liabilities. Additionally as part of the Separation, GCP assumed $0.8 million of prior service credit and $0.7 million of actuarial losses, both net of tax. During the second quarter of 2016 , GCP entered into an agreement to eliminate retiree life insurance benefits for one of its two remaining bargaining locations. This plan change was a negative plan amendment that resulted in a $1.0 million curtailment gain, which is recognized in operating income for the nine months ended September 30, 2016. Pension Plans GCP sponsors certain defined benefit pension plans, primarily in the U.S . and the United Kingdom in which GCP employees participate. GCP records an asset or liability to recognize the funded status of these pension plans in its Consolidated Balance Sheets. The Shared Plans that were legally separated during the first quarter of 2016, as discussed under "Multiemployer Benefit Plans" above, resulted in an approximate $44 million increase to pension liabilities as of March 31, 2016. Net funded status and net periodic benefit cost as of September 30, 2016 is shown below. The following table presents the funded status of GCP's overfunded, underfunded and unfunded defined pension plans: (In millions) September 30, December 31, Overfunded defined benefit pension plans $ 24.4 $ 26.1 Underfunded defined benefit pension plans (47.2 ) (8.0 ) Unfunded defined benefit pension plans (35.6 ) (26.0 ) Total underfunded and unfunded defined benefit pension plans (82.8 ) (34.0 ) Pension liabilities included in other current liabilities (1.2 ) (1.1 ) Net funded status $ (59.6 ) $ (9.0 ) Overfunded plans include several advance-funded plans for which the fair value of the plan assets exceeds the projected benefit obligation ("PBO"). This group of plans was overfunded by $24.4 million as of September 30, 2016 , and the overfunded status is reflected as assets in "Overfunded defined benefit pension plans" in the Consolidated Balance Sheets. Underfunded plans include a group of advance-funded plans that are underfunded on a PBO basis. Unfunded plans include several plans that are funded on a pay-as-you-go basis, and therefore, the entire PBO is unfunded. As of September 30, 2016 , the combined balance of $84.0 million for the underfunded and unfunded plans included as liabilities in the Consolidated Balance Sheets is comprised of current and non-current components of $1.2 million in "Other current liabilities" and $82.8 million in "Underfunded and unfunded defined benefit pension plans", respectively. During the third quarter of 2016 , GCP amended a pension plan at one non-U.S. location, resulting in a curtailment gain of $0.2 million . During the second quarter of 2016, GCP terminated a pension plan at one non-U.S. location, resulting in a curtailment gain of $1.4 million . For the nine months ended September 30, 2016, GCP recognized a total of $1.6 million in operating income relating to non-U.S. pension plan curtailment gains. Components of Net Periodic Benefit Cost (Income) Three Months Ended September 30, 2016 2015 Pension Other Post Pension Other Post (In millions) U.S. Non-U.S. U.S. Non-U.S. Service cost $ 1.6 $ 0.8 $ — $ 0.1 $ 0.8 $ — Interest cost 1.1 1.9 — 0.1 2.3 — Expected return on plan assets (1.2 ) (2.1 ) — (0.2 ) (2.8 ) — Amortization of net deferred actuarial loss — — 0.1 — — — Gain on termination and curtailment of pension and other postretirement plans — (0.2 ) — — — — Net periodic benefit cost (1) $ 1.5 $ 0.4 $ 0.1 $ — $ 0.3 $ — Nine Months Ended September 30, 2016 2015 Pension Other Post Pension Other Post (In millions) U.S. Non-U.S. U.S. Non-U.S. Service cost $ 4.6 $ 2.5 $ — $ 0.2 $ 2.3 $ — Interest cost 3.5 6.0 — 0.4 6.9 — Expected return on plan assets (3.7 ) (6.6 ) — (0.5 ) (8.3 ) — Amortization of prior service (credit) cost — (0.1 ) — 0.1 — Amortization of net deferred actuarial loss — — 0.1 — — — Gain on termination and curtailment of pension and other postretirement plans — (1.6 ) (1.0 ) — — — Net periodic benefit cost (income) (1) $ 4.4 $ 0.3 $ (1.0 ) $ 0.1 $ 1.0 $ — ___________________________________ (1) Includes expense that was allocated to Grace of $0.1 million for the nine months ended September 30, 2015 . Plan Contributions and Funding GCP intends to satisfy its funding obligations under the U.S. qualified pension plans and to comply with all of the requirements of the Employee Retirement Income Security Act of 1974, as amended ("ERISA"). For ERISA purposes, funded status is calculated on a different basis than under GAAP. In March 2016, GCP made an accelerated contribution to the trusts that hold assets of the U.S. qualified pension plans of approximately $1 million . GCP intends to fund non-U.S. pension plans based on applicable legal requirements as well as actuarial and trustee recommendations. Defined Contribution Retirement Plan As part of the Separation, GCP established a defined contribution retirement plan for its employees in the United States, similar in design to the Grace defined contribution retirement plan. This plan is qualified under section 401(k) of the U.S. tax code. Currently, GCP contributes an amount equal to 100% of employee contributions, up to 6% of an individual employee's salary or wages. GCP's costs included in selling, general and administrative expenses related to this benefit plan for the three and nine months ended September 30, 2016 were $1.2 million and $3.4 million compared with GCP's allocation of the total cost related to this benefit plan of $1.2 million and $3.8 million for the corresponding prior-year periods.

Other Balance Sheet Accounts

Other Balance Sheet Accounts	9 Months Ended
	Sep. 30, 2016
Payables and Accruals [Abstract]
Other Balance Sheet Accounts	Other Balance Sheet Accounts (In millions) September 30, December 31, Other Current Liabilities Customer volume rebates $ 28.7 $ 33.5 Accrued compensation (1) 37.0 27.1 Income tax payable (2) 14.8 23.3 Accrued interest 8.3 3.9 Pension liabilities 1.2 1.1 Other accrued liabilities 43.0 36.6 Total other current liabilities $ 133.0 $ 125.5 ________________________________ (1) Accrued compensation in the table above includes salaries and wages as well as estimated current amounts due under the annual and long-term incentive programs. (2) Income tax items above do not include amounts due from/to Grace, which are reflected in other assets on the accompanying Consolidated Balance Sheets.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities Purchase Commitments GCP uses purchase commitments to ensure supply and to minimize the volatility of certain key raw materials including lignins, polycarboxylates, amines and other materials. Such commitments are for quantities that GCP fully expects to use in its normal operations. Guarantees and Indemnification Obligations GCP is a party to many contracts containing guarantees and indemnification obligations. These contracts primarily consist of: • Product warranties with respect to certain products sold to customers in the ordinary course of business. These warranties typically provide that products will conform to specifications. GCP accrues a general warranty liability at the time of sale based on historical experience and on a transaction-specific basis according to individual facts and circumstances. Both the liability and annual expense related to product warranties are immaterial to the Consolidated Financial Statements. • Performance guarantees offered to customers. GCP has not established a liability for these arrangements based on past performance. • Contracts providing for the sale of a former business unit or product line in which GCP has agreed to indemnify the buyer against liabilities arising prior to the closing of the transaction, including environmental liabilities. • The Tax Sharing Agreement, which may require GCP, in certain circumstances, to indemnify Grace if the Separation, together with certain related transactions, does not qualify under Section 355 and certain other relevant provisions of the Internal Revenue Code (the "Code"). If GCP is required to indemnify Grace under the Tax Sharing Agreement, it could be subject to significant tax liabilities. 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 accrues for anticipated costs associated with response efforts where an assessment has indicated that a probable liability has been incurred and the cost can be reasonably estimated. As of September 30, 2016 , 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 and environmental matters and other matters. At September 30, 2016 , GCP had gross financial assurances issued and outstanding of $6.0 million , composed of standby letters of credit. Lawsuits and Investigations From time to time, GCP and its subsidiaries are parties to, or targets of, lawsuits, claims, investigations and proceedings which are managed and defended in the ordinary course of business. While GCP is unable to predict the outcome of these matters, it does not believe, based upon currently available facts, that the ultimate resolution of any of such pending matters will have a material adverse effect on its overall financial condition, results of operations or cash flows. Accounting for Contingencies Although the outcome of each of the matters discussed above cannot be predicted with certainty, GCP has assessed its risk and has made accounting estimates and disclosures as required under GAAP.

Restructuring and Repositioning

Restructuring and Repositioning Expenses	9 Months Ended
	Sep. 30, 2016
Restructuring and Related Activities [Abstract]
Restructuring and Repositioning Expenses	Restructuring and Repositioning Expenses Restructuring Expenses GCP's Board of Directors approves all major restructuring programs that may involve the discontinuance of significant product lines or the shutdown of significant facilities. From time to time, GCP takes additional restructuring actions, including involuntary terminations that are not part of a major program. GCP accounts for these costs, which are reflected in restructuring expense in its Consolidated Statements of Operations, in the period that the related liabilities are incurred. Restructuring expenses are excluded from segment operating income. For the third quarter of 2016 , GCP incurred $0.4 million ( $0.3 million in SCC and $ 0.1 million in SBM) of restructuring expenses, compared with $2.3 million ( $1.3 million in SCC, $0.4 million in SBM and $0.6 million in Darex) for the prior-year quarter. GCP incurred $1.4 million ( $0.8 million in SCC and $ 0.6 million in SBM) of restructuring expenses for the nine months ended September 30, 2016 , compared with $9.9 million ( $5.7 million in SCC, $ 2.7 million in SBM and $1.5 million in Darex) for the nine months ended September 30, 2015 . GCP had restructuring liabilities of $1.4 million as of September 30, 2016 and December 31, 2015 , related to severance actions taken during the periods. GCP expects to pay substantially all costs related to its current restructuring programs by December 31, 2016 . Restructuring Liability (In millions) Total Balance, December 31, 2015 $ 1.4 Accruals for severance 1.4 Payments (2.8 ) Impact of foreign currency and other 1.4 Balance, September 30, 2016 $ 1.4 Repositioning Expenses Post-Separation, GCP has incurred expenses related to its transition to a stand-alone public company. The Company expects to incur these repositioning expenses, ranging from $18.0 million to $20.0 million , within 18 months of the Separation. Repositioning expenses primarily relate to the following: • accounting, tax, legal and other professional costs pertaining to the Separation and establishment as a stand-alone public company; • costs relating to information technology systems and marketing expense for repackaging and re-branding; • employee-related costs that would not be incurred absent the Separation primarily relating to compensation, benefits, retention bonuses related to new or transitioning employees; and • recruitment and relocation costs associated with hiring and relocating employees. Due to the scope and complexity of these activities, the range of estimated repositioning expenses could increase or decrease and the timing of incurrence could change. For the three and nine months ended September 30, 2016 , GCP incurred repositioning expenses as follows: (In millions) Three Months Ended September 30, 2016 Nine Months Ended September 30, 2016 Professional fees $ 3.1 $ 7.3 Software and IT implementation fees 0.8 2.5 Employee-related costs 1.4 4.5 Total $ 5.3 $ 14.3 GCP accounts for these costs, which are reflected in repositioning expense in the accompanying Consolidated Statements of Operations, in the period incurred. Substantially all of these costs have been or are expected to be settled in cash. Total cash payments for the nine months ended September 30, 2016 were $14.7 million for professional fees and employee-related costs, $ 5.7 million for capital expenditures and $6.9 million for taxes.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following tables present the pre-tax, tax, and after-tax components of GCP's other comprehensive income (loss) for the three and nine months ended September 30, 2016 and 2015 : Three Months Ended September 30, 2016 Pre-Tax Amount Tax Benefit/ (Expense) After-Tax Amount (In millions) Defined benefit pension and other postretirement plans: Amortization of net actuarial gain 0.1 — 0.1 Other changes in funded status $ (0.1 ) $ — $ (0.1 ) Benefit plans, net — — — Currency translation adjustments 3.0 — 3.0 Loss from hedging activities (0.1 ) — (0.1 ) Other comprehensive income attributable to GCP shareholders $ 2.9 $ — $ 2.9 Nine Months Ended September 30, 2016 Pre-Tax Amount Tax Benefit/ (Expense) After-Tax Amount (In millions) Defined benefit pension and other postretirement plans: Amortization of net prior service credit $ (0.1 ) $ — $ (0.1 ) Amortization of net actuarial gain 0.1 — 0.1 Assumption of net prior service credit 1.2 (0.4 ) 0.8 Assumption of net actuarial loss (1.1 ) 0.4 (0.7 ) Other changes in funded status (0.9 ) 0.3 (0.6 ) Benefit plans, net (0.8 ) 0.3 (0.5 ) Currency translation adjustments 3.5 — 3.5 Loss from hedging activities (0.1 ) — (0.1 ) Other comprehensive income attributable to GCP shareholders $ 2.6 $ 0.3 $ 2.9 Three Months Ended September 30, 2015 Pre-Tax Amount Tax Benefit/ (Expense) After-Tax Amount (In millions) Currency translation adjustments $ (19.7 ) $ — $ (19.7 ) Gain from hedging activities 0.3 (0.1 ) 0.2 Other comprehensive loss attributable to GCP shareholders $ (19.4 ) $ (0.1 ) $ (19.5 ) Nine Months Ended September 30, 2015 Pre-Tax Amount Tax Benefit/ (Expense) After-Tax Amount (In millions) Defined benefit pension and other postretirement plans: Amortization of net prior service cost $ 0.1 $ (0.1 ) $ — Benefit plans, net 0.1 (0.1 ) — Currency translation adjustments (39.1 ) — (39.1 ) Gain from hedging activities 0.4 (0.2 ) 0.2 Other comprehensive loss attributable to GCP shareholders $ (38.6 ) $ (0.3 ) $ (38.9 ) The following tables present the changes in accumulated other comprehensive income (loss), net of tax, for the nine months ended September 30, 2016 and 2015 : Nine Months Ended September 30, 2016 Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments (Losses) Gains from Hedging Activities Total (In millions) Beginning balance $ 0.1 $ (127.8 ) $ — $ (127.7 ) Other comprehensive income (loss) before reclassifications — 3.5 (1.2 ) 2.3 Amounts reclassified from accumulated other comprehensive (loss) income (0.5 ) — 1.1 0.6 Net current-period other comprehensive (loss) income (0.5 ) 3.5 (0.1 ) 2.9 Ending balance $ (0.4 ) $ (124.3 ) $ (0.1 ) $ (124.8 ) Nine Months Ended September 30, 2015 Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments (Losses) Gains from Hedging Activities Total (In millions) Beginning balance $ (0.3 ) $ (65.5 ) $ (0.2 ) $ (66.0 ) Other comprehensive (loss) income before reclassifications — (39.1 ) 0.4 (38.7 ) Amounts reclassified from accumulated other comprehensive loss — — (0.2 ) (0.2 ) Net current-period other comprehensive (loss) income — (39.1 ) 0.2 (38.9 ) Ending balance $ (0.3 ) $ (104.6 ) $ — $ (104.9 ) GCP is a global enterprise operating in over 40 countries with local currency generally deemed to be the functional currency for accounting purposes. The currency translation adjustments reflect translation of the balance sheets valued in local currencies to the U.S. dollar as of the end of each period presented, and translation of revenues and expenses at average exchange rates for each period presented.

Stock Incentive Plans

Stock Incentive Plans	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans	Stock Incentive Plans GCP has provided certain key employees equity awards in the form of stock options, performance-based units (“PBUs”) and restricted share units (“RSUs”) under the GCP 2016 Stock Incentive Plan, which was adopted at Separation. Certain employees and members of the Board of Directors are eligible to receive stock-based compensation, including stock, stock options, RSUs, and PBUs. Total cash and non-cash stock-based compensation cost included in the Consolidated Statements of Operations is $2.0 million for the three months ended September 30, 2016 and $0.9 million for the three months ended September 30, 2015 . Total cash and non-cash stock-based compensation cost included in the Consolidated Statements of Operations is $5.6 million for the nine months ended September 30, 2016 and $2.8 million for the nine months ended September 30, 2015 . Stock-based compensation expense prior to the Separation was allocated to GCP based on the portion of Grace’s equity compensation programs in which GCP employees participated. In accordance with the Employee Matters Agreement, previously outstanding stock-based compensation awards granted under Grace’s equity compensation programs prior to the Separation and held by certain executives and employees of GCP and Grace were adjusted to reflect the impact of the Separation on these awards. To preserve the aggregate intrinsic value of Grace awards held prior to the Separation, as measured immediately before and immediately after the Separation, each holder of Grace stock-based compensation awards generally received an adjusted award consisting of either (i) both a stock-based compensation award denominated in Grace equity as it existed subsequent to the Separation and a stock-based compensation award denominated in GCP equity or (ii) solely a stock-based compensation award denominated in the equity of the company at which the person was employed following the Separation. In the Separation, the determination as to which type of adjustment applied to a holder’s previously outstanding Grace award was based upon the type of stock-based compensation award that was to be adjusted and the date on which the award was originally granted under the Grace equity compensation programs prior to the Separation. Adjusted awards consisting of stock-based compensation awards denominated in GCP equity are considered issued under the GCP 2016 Stock Incentive Plan. These adjusted awards generally will be subject to the same vesting conditions and other terms that applied to the original Grace award to which these adjusted awards relate, before the Separation. Under the Employee Matters Agreement, GCP is obligated to settle all of the stock-based compensation awards denominated in GCP equity, regardless of whether the holders are employees of GCP or Grace. Likewise, Grace is obligated to settle all of the stock-based compensation awards denominated in Grace shares, regardless of whether the holders are employees of GCP or Grace. As a result, GCP has recorded a liability for cash-settled awards held by Grace employees. The adjustment of the original Grace awards that resulted in the issuance of GCP stock-based compensation awards resulted in an immaterial charge in the first quarter of 2016. In accordance with certain provisions of the GCP 2016 Stock Incentive Plan, GCP repurchases shares issued to certain holders of GCP awards in order to fulfill statutory tax withholding requirements for the employee. In the nine months ended September 30, 2016 , GCP repurchased approximately 96,270 shares under these provisions. These purchases are reflected as "Treasury stock purchased under 2016 Stock Incentive Plan" in the Consolidated Statement of (Deficit) Equity. As of September 30, 2016 , 1,641,952 shares of common stock were available for issuance under the GCP 2016 Stock Incentive Plan. Stock Options Stock options are non-qualified and are set at exercise prices not less than 100% of the market value on the date of grant (market value is the average of the high price and low price from that trading day). Stock option awards that relate to Grace stock options originally granted prior to the Separation have a contractual term of five years from the original date of grant. Stock option awards granted post-Separation have a contractual term of seven years from the original date of grant. Generally, stock options vest in substantially equal amounts each year over three years from the date of grant. GCP values stock options using the Black-Scholes option pricing model, which was developed for use in estimating the fair value of traded options. The risk-free rate is based on the U.S. Treasury yield curve published as of the grant date, with maturities approximating the expected term of the options. GCP estimates the expected term of the options according to the simplified method as allowed by FASB Accounting Standards Codification ("ASC") Topic No. 718-20, Awards Classified as Equity, whereby the average between the vesting period and contractual term is used. GCP estimated the expected volatility using an industry peer group. The following summarizes GCP's assumptions for estimating the fair value of stock options granted during 2016 : Assumptions used to calculate expense for stock option Nine Months Ended September 30, 2016 Risk-free interest rate 0.93 - 1.24% Average life of options (years) 4 - 5 Volatility 29.6 – 33.2% Dividend yield — Average fair value per stock option $4.88 The following table summarizes GCP stock option activity for the nine months ended September 30, 2016 : Stock Option Activity Number Of Weighted Weighted Aggregated Outstanding, December 31, 2015 — $ — Converted on February 3, 2016 2,236 14.36 Options exercised 757 9.68 Options forfeited 5 18.95 Options granted 748 17.18 Outstanding, September 30, 2016 2,222 16.90 3.81 $ 25,131 Exercisable September 30, 2016 945 $ 15.42 2.00 12,077 The aggregate intrinsic values in the table above represent the total pre-tax intrinsic value (the difference between GCP's closing stock price on the last trading day of September 30, 2016 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their in-the-money options at period end. The amount changes based on the fair market value of GCP's stock. The intrinsic value of all options exercised in the nine-month period ended September 30, 2016 was $8.7 million . Total unrecognized stock-based compensation expense for stock options outstanding at September 30, 2016 , was $2.5 million and the weighted-average period over which this expense will be recognized is approximately 1.3 years. Restricted Stock Units and Performance Based Units Upon Separation, certain previously outstanding RSUs and PBUs granted under Grace's equity compensation programs prior to the Separation were adjusted, in accordance with the Employee Matters Agreement, such that holders of these original Grace RSUs and PBUs received RSUs denominated in GCP equity. RSUs generally vest over a three year period, with vesting in substantially equal amounts each year over three years and some vesting 100% after the third year from the date of grant. A smaller number of RSUs were designated as sign-on awards and used for purposes of attracting key employees and to cover outstanding awards from a prior employer and vest 100% after two years . GCP’s RSU activity for the nine months ended September 30, 2016 is as follows: RSU Activity Number Of Weighted Outstanding, December 31, 2015 — $ — Converted on February 3, 2016 265 17.00 RSUs settled 31 16.90 RSUs granted 323 17.11 RSUs outstanding, September 30, 2016 557 $ 17.07 During the nine months ended September 30, 2016 , GCP distributed 25,000 shares and $0.5 million of cash to settle RSUs. GCP expects that approximately 41% of the 80,621 RSUs vesting in 2016 , none of the 68,211 RSUs vesting in 2017, 37% of the 162,707 RSUs vesting in 2018 and none of the 245,176 RSUs vesting in 2019, will be settled in cash, with the remaining percentages of these RSUs to be settled in GCP stock. During the nine months ended September 30, 2016 , GCP granted 155,501 PBUs under the GCP 2016 Stock Incentive Plan to Company employees. These awards vest on February 2019 subject to continued employment through the payment date, and have a weighted average grant date fair value of $17.04 . GCP anticipates that 100% of the PBUs will be settled in GCP common stock upon vesting. PBUs granted in 2016 are based on a three year cumulative adjusted earnings per share measure. The number of shares ultimately provided to an employee who received a 2016 PBU grant will be based on Company performance against this measure, and can range from 0% to 200% of the target number of shares granted based upon the level of achievement of this measure. The awards will be settled in 2019 once actual performance against the measure, which is measured over fiscal years 2016 -2018, is certified by the Compensation Committee. PBUs and RSUs are recorded at fair value at the date of grant. The common stock-settled portion of each such award is considered an equity award, with the stock compensation expense being determined based on GCP’s stock price on the grant date. The cash settled portion of the award is considered a liability award with the liability being remeasured each reporting period based on GCP’s then current stock price. PBU stock-and cash-settled awards are remeasured each reporting period based on the expected payout of the award, which may range from 0% to 200% of the targets for such awards; therefore, these portions of the awards are subject to volatility until the payout is finally determined at the end of the performance period. As of September 30, 2016 , $7.9 million of total unrecognized compensation expense related to the RSU and PBU awards is expected to be recognized over the remaining weighted-average service period of 1.7 years.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table shows a reconciliation of the numerators and denominators used in calculating basic and diluted earnings (loss) per share: Three Months Ended September 30, Nine Months Ended September 30, (In millions, except per share amounts) 2016 2015 2016 2015 Numerators Net income (loss) attributable to GCP shareholders $ 21.3 $ (15.3 ) $ 69.4 $ 32.4 Denominators Weighted average common shares—basic calculation 71.0 70.5 70.8 70.5 Dilutive effect of employee stock awards 1.2 — 0.8 — Weighted average common shares—diluted calculation 72.2 70.5 71.6 70.5 Basic earnings (loss) per share $ 0.30 $ (0.22 ) $ 0.98 $ 0.46 Diluted earnings (loss) per share $ 0.30 $ (0.22 ) $ 0.97 $ 0.46 The computation of basic and diluted earnings (loss) per common share is calculated assuming the number of shares of GCP common stock outstanding on February 3, 2016 had been outstanding at the beginning of each period presented. For periods prior to the Separation, it is assumed that there are no dilutive equity instruments as there were no equity awards in GCP outstanding prior to the Separation. See Note 1 for further discussion of the Separation. There were approximately 0.2 million anti-dilutive options and 0.1 million anti-dilutive RSUs outstanding on a weighted average basis for the nine months ended September 30, 2016 , respectively. There were no anti-dilutive options or anti-dilutive RSU's outstanding on a weighted-average basis for the three months ended September 30, 2016 . During the nine months ended September 30, 2016 , GCP repurchased 96,270 shares of Company common stock for $1.8 million , respectively, in connection with its equity compensation programs.

Related Party Transactions and

Related Party Transactions and Transactions with Grace	9 Months Ended
	Sep. 30, 2016
Related Party Transactions [Abstract]
Related Party Transactions and Transactions with Grace	Related Party Transactions and Transactions with Grace Related Parties 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. Allocation of General Corporate Expenses Prior to the Separation, the financial statements included expense allocations for certain functions provided by Grace as well as other Grace employees not solely dedicated to GCP, including, but not limited to, general corporate expenses related to finance, legal, information technology, human resources, communications, ethics and compliance, shared services, employee benefits and incentives and stock-based compensation. These expenses were allocated to GCP on the basis of direct usage when identifiable, with the remainder allocated on the basis of revenue, headcount or other measures. The expense allocations from Grace prior to the Separation included costs associated with defined benefit pension and other postretirement benefit plans (the “Shared Plans”) sponsored by Grace in which certain of GCP's employees participated. GCP accounted for such Shared Plans as multiemployer benefit plans. Accordingly, GCP did not record an asset or liability to recognize the funded status of the Shared Plans. As part of the Separation, Grace has split certain Shared Plans and transferred the assets and liabilities of such plans related to GCP employees to GCP. The expense allocations were determined on a basis that GCP considered to be a reasonable reflection of the utilization of or benefit received by GCP for the services provided by Grace. The allocations may not, however, reflect the expense GCP would have incurred as an independent company for the periods presented. Between January 1, 2016 and the Separation, GCP was allocated $ 2.0 million of general corporate expense, which is primarily included within "Selling, general and administrative expenses" in the accompanying Statement of Operations for the nine months ended September 30, 2016 . During the nine months ended September 30, 2015 Grace allocated $40.2 million of general corporate expenses to GCP. For the three months ended September 30, 2016 , GCP was not allocated any general corporate expense, compared with $ 13.3 million for the three months ended September 30, 2015 . Transition Services Agreement In connection with the Separation, the Company entered into a transition services agreement pursuant to which GCP and Grace provide various services to each other on a temporary, transitional basis. The services provided by Grace to GCP include information technology, treasury, tax administration, accounting, financial reporting, human resources and other services. Following the Separation, Grace will continue to provide some of these services on a transitional basis, generally for a period of up to 18 months from the date of Separation. Tax Sharing Agreement The Tax Sharing Agreement 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, and 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 (and 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); and Grace is responsible for all U.S. federal, state and foreign income taxes (and 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. As of the balance sheet date, GCP has included $7.0 million of indemnified receivables ( $2.5 million in other current assets and $4.5 million in other assets). In addition, the Tax Sharing Agreement imposes certain restrictions on GCP and its subsidiaries (including restrictions on share issuances, business combinations, sales of assets and similar transactions) that are designed to preserve the qualification of the Distribution, together with certain related transactions, under Section 355 and certain other relevant provisions of the Code. The Tax Sharing Agreement provides special rules that allocate tax liabilities in the event the Distribution, together with certain related transactions, does not so qualify. In general, under the Tax Sharing Agreement, each party is expected to be responsible for any taxes imposed on, and certain related amounts payable by, GCP or Grace that arise from the failure of the Distribution and certain related transactions, to qualify under Section 355 and certain other relevant provisions of the Code, to the extent that the failure to so qualify is attributable to actions, events or transactions relating to such party’s respective stock, assets or business, or a breach of the relevant representations or covenants made by such party in the Tax Sharing Agreement. Parent Company Equity Net transfers to parent are included within net parent investment on the Consolidated Statements of (Deficit) Equity. The components of the net transfers to parent as of September 30, 2016 and 2015 are as follows: Nine Months Ended September 30, (In millions) 2016 2015 Cash pooling and general financing activities $ (685.1 ) $ (237.5 ) GCP expenses funded by parent 6.6 43.0 Corporate costs allocations 2.0 40.2 Provision for income taxes 4.3 58.2 Total net transfers to parent (672.2 ) (96.1 ) Other, net (92.4 ) 26.5 Transfers to parent, net per Consolidated Statements of Cash Flows $ (764.6 ) $ (69.6 ) Other, net includes the non-cash transfer from parent of approximately $44 million of net pension liabilities, approximately $23 million of fixed assets and the non-cash transfer of approximately $42 million of related-party debt, deferred tax items and other items. As discussed in Note 3, GCP used proceeds from the Notes and Credit Facilities to fund a distribution to Grace in an amount of $750.0 million related to the Separation. This distribution is reflected as a component of transfers to parent in the table above.

Operating Segment Information

Operating Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Operating Segment Information	Operating Segment Information GCP is engaged in the production and sale of specialty construction chemicals, specialty building materials and packaging products through three operating segments. Specialty Construction Chemicals manufactures and markets concrete admixtures and cement additives. Specialty Building Materials 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. Darex Packaging Technologies manufactures and markets packaging materials for use in beverage and food containers, industrial containers and other consumer and industrial applications. The table below presents information related to GCP's operating segments. Only those corporate expenses directly related to the operating segments are allocated for reporting purposes. GCP excludes certain functional costs, impacts of foreign exchange (related primarily to Venezuela) and other corporate costs such as certain performance-based incentive compensation and public company costs from segment operating income. GCP also excludes certain ongoing defined benefit pension costs recognized quarterly, which include service and interest costs, the effect of expected returns on plan assets and amortization of prior service costs/credits, from the calculation of segment operating income. GCP believes that the exclusion of certain corporate costs and pension costs provides a better indicator of its operating segment performance as such costs are not managed at an operating segment level. Corporate costs and certain pension costs excluded from segment operating income were $9.2 million and $7.2 million and $29.5 million and $20.3 million for the three and nine months ended September 30, 2016 and 2015, respectively. Operating Segment Data Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2016 2015 2016 2015 Net Sales Specialty Construction Chemicals $ 162.8 $ 201.9 $ 466.6 $ 534.2 Specialty Building Materials 100.6 102.0 318.5 297.6 Darex Packaging Technologies 79.1 85.8 237.8 254.3 Total $ 342.5 $ 389.7 $ 1,022.9 $ 1,086.1 Segment Operating Income Specialty Construction Chemicals segment operating income $ 23.2 $ 37.2 $ 53.7 $ 66.9 Specialty Building Materials segment operating income 25.6 26.7 88.9 73.3 Darex Packaging Technologies segment operating income 15.9 20.9 51.2 56.0 Total segment operating income $ 64.7 $ 84.8 $ 193.8 $ 196.2 Reconciliation of Operating Segment Data to Financial Statements Total segment operating income for the three and nine months ended September 30, 2016 and 2015 , is reconciled below to income before income taxes presented in the accompanying Consolidated Statements of Operations. Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2016 2015 2016 2015 Total segment operating income $ 64.7 $ 84.8 $ 193.8 $ 196.2 Corporate costs (7.1 ) (5.9 ) (23.2 ) (16.5 ) Certain pension costs (2.1 ) (1.3 ) $ (6.3 ) $ (3.8 ) Currency and other financial losses in Venezuela — (73.2 ) — (73.2 ) Repositioning expenses (5.3 ) — (14.3 ) — Restructuring expenses (0.4 ) (2.3 ) (1.4 ) (9.9 ) Pension MTM adjustment and other related costs, net — — (2.7 ) (0.5 ) Gain on termination and curtailment of pension and other postretirement plans 0.2 — 2.6 — Third-party acquisition-related costs (0.3 ) — (0.3 ) — Net income attributable to noncontrolling interests 0.2 0.3 0.9 0.6 Other financing costs (1.2 ) — (1.2 ) — Interest expense, net (17.6 ) (0.6 ) (47.8 ) (1.7 ) Income before income taxes $ 31.1 $ 1.8 $ 100.1 $ 91.2 Geographic Area Data The table below presents information related to the geographic areas in which GCP operates. Sales are attributed to geographic areas based on customer location. Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2016 2015 2016 2015 Net Sales United States $ 134.6 $ 133.0 $ 402.7 $ 378.3 Canada and Puerto Rico 9.2 8.6 25.2 22.9 Total North America 143.8 141.6 427.9 401.2 Europe Middle East Africa 79.5 88.9 249.3 260.7 Asia Pacific 81.9 83.3 242.6 248.6 Latin America 37.3 75.9 103.1 175.6 Total $ 342.5 $ 389.7 $ 1,022.9 $ 1,086.1

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Acquisitions	Acquisitions On August 9, 2016, GCP acquired the intellectual property and related assets of Sensocrete, a Canadian technology company in the ready mix concrete industry. This acquisition did not have a material effect on the Company's financial statements for the periods presented.

Subsequent Event

Subsequent Event	9 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On November 9, 2016, GCP acquired 100% of the stock of Halex Corporation for approximately $47 million in cash. Halex is a supplier of specialty moisture barrier flooring underlayment products, seam tapes and accessories with annual net sales of approximately $45 million . The business will be included within GCP’s Specialty Building Materials operating segment. The acquisition purchase price, subject to normal and customary purchase price adjustments, was partially funded by a $25 million draw on the Company's revolving credit facility. Due to the timing of the acquisition, the Company has not yet finalized the purchase price allocation in accordance with ASC 805, “ Business Combinations. ”

Basis of Presentation and Sum23

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies (Policies)	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The financial statements for periods prior to the Separation have been prepared on a stand-alone basis and are derived from the consolidated financial statements and accounting records of Grace, as the Company's business operated as a combination of entities under common control of Grace. These financial statements reflect the historical basis and carrying values established when the Company was part of Grace. Subsequent to the Separation, the accompanying Consolidated Financial Statements are presented on a consolidated basis and include all of the accounts and operations of GCP and its majority-owned subsidiaries. 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 of America ("GAAP") and with the instructions to Form 10-Q and Article 10 of SEC Regulation S-X for interim financial information.
Principles of Combination	The interim financial statements presented herein are unaudited and should be read in conjunction with the Combined Financial Statements presented in the Company's 2015 Annual Report on Form 10-K. Such 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 as discussed below. All significant intercompany accounts and transactions have been eliminated. The results of operations for the nine-month interim period ended September 30, 2016 are not necessarily indicative of the results of operations for the year ending December 31, 2016 . All transactions between GCP and Grace have been included in these financial statements. Prior to the Separation, all such transactions, other than intercompany loan transactions, are effectively considered to be settled for cash, in the Combined Financial Statements at the time the transactions were recorded . The intercompany loans payable to Grace and the related interest and cash flows, as presented in Note 3 are reflected as "Borrowings under related party loans" and "Repayments under related party loans" in the Statements of Cash Flows, as "Loans payable-related party" in the Balance Sheets and as "Interest expense, net-related party" in the Statements of Operations. Subsequent to the Separation, Grace is no longer a related party of the Company. Prior to the Separation, the financial statements included expenses of Grace allocated to GCP for certain functions provided by Grace, including, but not limited to, general corporate expenses related to finance, legal, information technology, human resources, communications, ethics and compliance, environment health and safety, supply chain, shared services, employee benefits and incentives, insurance and stock-based compensation. These expenses were allocated to GCP on the basis of direct usage when identifiable, with the remainder allocated on the basis of revenue, headcount or other measures. These cost allocations were included in selling, general and administrative expenses in the Statement of Operations. Most of these costs were included in segment operating income with only a portion included in corporate costs. Both GCP and Grace consider the basis on which the expenses have been allocated to be a reasonable reflection of the utilization of services provided to, or the benefit received by, GCP during the periods presented. Subsequent to the Separation, GCP has performed most of these functions using its own resources or purchased services. However, the remainder of these functions will continue to be provided by Grace under a transition services agreement, for a period generally up to 18 months from the Separation. See Note 12 for further description of the transition services agreement between GCP and Grace. Prior to the Separation, the financial statements also included the assets and liabilities that were historically held at the Grace corporate level but were specifically identifiable or otherwise pushed down to GCP. The cash and cash equivalents held by Grace at the corporate level were not specifically identifiable to GCP and therefore were not allocated to GCP for any of the periods presented. Prior to the Separation, cash and cash equivalents in the Balance Sheets represent primarily cash held locally by entities included in the financial statements. Third-party debt and the related interest expense of Grace were not allocated to GCP for any of the periods presented as GCP was not the legal obligor of the debt and the Grace borrowings were not directly attributable to GCP's business. The financial statements exclude all assets, liabilities, income, gains, costs and expenses reported by Grace related to asbestos and bankruptcy matters. Prior to the Separation, these matters were not allocated to GCP as Grace was the legal obligor for those liabilities and Grace is expected to pay all future liabilities and costs related to such matters as such matters were not historically managed by GCP. Grace retained full responsibility for these matters following the Separation and GCP has not indemnified Grace for any losses or payments associated with these matters. Prior to the Separation, Grace used a centralized approach to cash management and financing of its operations and Grace funded GCP's operating and investing activities as needed. Prior to the Separation, cash transfers to and from the cash management accounts of Grace are reflected in the Statements of Cash Flows as “Transfers (to) from parent, net.”
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses for the periods presented. Actual amounts could differ from those estimates, and the differences could be material. Changes in estimates are recorded in the period identified. GCP's accounting measurements that are most affected by management's estimates of future events are: • Contingent liabilities, which depend on an assessment of the probability of loss and an estimate of ultimate resolution cost, that may arise from circumstances such as legal disputes, environmental remediation, product liability claims, material commitments (see Note 7 to the Consolidated Financial Statements) and income taxes (see Note 4 to the Consolidated Financial Statements); • Pension and postretirement liabilities that depend on assumptions regarding participant life spans, future inflation, discount rates and total returns on invested funds (see Note 5 to the Consolidated Financial Statements); and • Realization values of net deferred tax assets, which depend on projections of future taxable income (see Note 4 to the Consolidated Financial Statements).
Reclassifications and Revisions	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. Certain amounts within "Net cash provided by operating activities" in the Company’s Consolidated Statement of Cash Flows for the nine months ended September 30, 2015 have been reclassified to conform to current period presentation. These reclassifications had no effect on the previously reported cash flows from operating, investing and financing activities.
Income Tax	Income Tax As a global enterprise, GCP is subject to a complex array of tax regulations and must make assessments of applicable tax law and judgments in estimating its ultimate income tax liability. In the financial statements for periods prior to the Separation, income tax expense and tax balances were calculated using the separate return method as if GCP was a separate taxpayer, although GCP was included in tax returns filed by Grace. After the Separation, income tax expense and income tax balances represent GCP’s federal, state and foreign income taxes as an independent company. As a stand-alone entity, GCP will file tax returns on its own behalf and its deferred taxes and effective tax rate may not be comparable to those of historical periods prior to the Separation. See Note 4 for details regarding estimates used in accounting for income tax matters including unrecognized tax benefits.
Stock-Based Compensation Expense	Stock-Based Compensation Expense Prior to the Separation, GCP was allocated stock-based compensation expense from Grace related to GCP employees receiving awards denominated in Grace equity instruments. In accordance with an employee matters agreement entered into between Grace and GCP on January 27, 2016 in connection with the Separation (the "Employee Matters Agreement"), previously outstanding stock-based compensation awards granted under Grace's equity compensation programs prior to the Separation and held by certain executives and employees of GCP and Grace were adjusted to reflect the impact of the Separation on these awards. To preserve the aggregate intrinsic value of these stock-based compensation awards, as measured immediately before and immediately after the Separation, each holder of Grace stock-based compensation awards generally received an adjusted award consisting of either (i) both a stock-based compensation award denominated in Grace equity as it existed subsequent to the Separation and a stock-based compensation award denominated in GCP equity or (ii) solely a stock-based compensation award denominated in the equity of the company at which the person was employed following the Separation. In the Separation, the determination as to which type of adjustment applied to a holder’s previously outstanding Grace award was based upon the type of stock-based compensation award that was to be adjusted and the date on which the award was originally granted under the Grace equity compensation programs prior to the Separation. Under the Employee Matters Agreement, GCP retains certain obligations related to all stock- and cash-settled stock-based compensation awards denominated in GCP equity, regardless of whether the holder is a GCP or Grace employee. Following the Separation, the Company records stock-based compensation expense for equity awards in accordance with authoritative accounting guidance.
Currency Translation	Currency Translation Assets and liabilities of foreign subsidiaries (other than those located in countries with highly inflationary economies) are translated into U.S. dollars at current exchange rates, while revenues, costs and expenses are translated at average exchange rates during each reporting period. The resulting currency translation adjustments are included in accumulated other comprehensive loss in the Consolidated Balance Sheets. The financial statements of any subsidiaries located in countries with highly inflationary economies are remeasured as if the functional currency were the U.S. dollar; the remeasurement creates translation adjustments that are reflected in net income in the Consolidated Statements of Operations. Effective January 1, 2010, GCP began to account for its Venezuela subsidiary as a highly inflationary economy. As a result, the functional currency of its Venezuelan subsidiary became the U.S. dollar; therefore, all translation adjustments are reflected in net income in the accompanying Consolidated Statements of Operations. The official exchange rate (CENCOEX) of 4.3 was used to remeasure GCP's financial statements from bolivars to U.S. dollars upon Venezuela's designation as a highly inflationary economy. On February 8, 2013, the Venezuelan government announced that, effective February 13, 2013, the official exchange rate of the bolivar to U.S. dollar would devalue from 4.3 to 6.3 . GCP continued to account for its results in Venezuela at the official exchange rate of 6.3 bolivars to one U.S. dollar until September 30, 2015. Based on developments in the third quarter of 2015, including changed expectations about GCP's ability to import raw materials into Venezuela at the official exchange rate and increased inflation, the Company determined that it was no longer appropriate to use the official exchange rate. Effective September 30, 2015, the Company began accounting for its results in Venezuela at the SIMADI rate. The Company recorded a pre-tax charge of $73.2 million in the third quarter of 2015 to reflect the devaluation of monetary assets and the impairment of non-monetary assets at the SIMADI rate of 199 bolivars to one U.S. dollar. We recorded $13.7 million of this amount related to inventory to cost of goods sold and $59.6 million related to other assets and liabilities as a separate line item in our Consolidated Statement of Operations, referred to as "Loss in Venezuela." In mid-February 2016, changes to the currency exchange systems were announced that eliminated the SICAD exchange rate and replaced the name SIMADI rate with DICOM, a floating exchange rate.
Recently Issued Accounting Standards	Recently Issued Accounting Standards Statement of Cash Flows In August 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Payments, which addresses eight specific cash flow presentation issues with the objective of reducing existing diversity in practice. ASU 2016-15 is effective for the Company on January 1, 2018 and requires a retrospective approach to adoption. GCP is currently evaluating the potential impact on its Consolidated Financial Statements and related disclosures. Revenue from Contracts with Customers In May 2016, the FASB issued ASU 2016-12, Narrow-Scope Improvements and Practical Expedients, which clarifies aspects of ASU 2014-09, Revenue from Contracts with Customers (Topic 606) , including non-cash consideration, and provides a practical expedient for reflecting contract modifications upon transition. The Company is currently evaluating the impact of adopting ASU 2016-12, which will occur in conjunction with its adoption of the new revenue recognition standard promulgated in Topic 606. ASU 2014-09 is effective for the Company on January 1, 2018, with early adoption permitted as of January 1, 2017, and requires either a retrospective or a modified retrospective approach to adoption. GCP is currently evaluating the available transition methods and the potential impact of the new revenue recognition standard on its Consolidated Financial Statements and related disclosures. In April 2016, the FASB issued ASU 2016-10, Identifying Performance Obligations and Licensing , which clarifies aspects of ASU 2014-09 pertaining to the identification of performance obligations and the licensing implementation guidance, while retaining the core principles for those areas. GCP is currently evaluating the impact of adopting ASU 2016-10, which will occur in conjunction with its adoption of Topic 606. In March 2016, the FASB issued ASU 2016-08, Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net) , which amends the principal-versus-agent implementation guidance in Topic 606 and will affect whether an entity reports revenue on a gross or net basis. GCP is currently evaluating the impact of adopting ASU 2016-08, which will occur in conjunction with its adoption of Topic 606. Leases In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) , which is intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The core principle of Topic 842 is that a lessee should recognize the assets and liabilities that arise from leases. A lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term, including optional payments where they are reasonably certain to occur. The amendments in this update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. GCP is currently evaluating the potential impact on its Consolidated Financial Statements and related disclosures. Recently Adopted Accounting Standards Accounting for Stock Compensation In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting . The updated standard is intended to simplify several areas of accounting for share-based compensation arrangements, including the income tax impact, classification on the statement of cash flows and forfeitures.

Basis of Presentation and Sum24

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies (Tables)	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of the Effects of the Early Adoption	The tables below summarize the effects of the adoption of this update on GCP's previously reported results for the 2016 first and second quarters and for the six months ended June 30, 2016. Consolidated Statement of Operations Three Months Ended March 31, 2016 Three Months Ended June 30, 2016 Six Months Ended June 30, 2016 (In millions, except per share amounts) Previously Reported Revised Effect of Change Previously Reported Revised Effect of Change Previously Reported Revised Effect of Change Provision for income taxes $ (8.4 ) $ (7.6 ) $ 0.8 $ (12.8 ) $ (12.6 ) $ 0.2 $ (21.2 ) $ (20.2 ) $ 1.0 Net income 17.4 18.2 0.8 30.4 30.6 0.2 47.8 48.8 1.0 Net income attributable to GCP shareholders 17.0 17.8 0.8 30.1 30.3 0.2 47.1 48.1 1.0 Basic earnings per share: Net income attributable to GCP shareholders $ 0.24 $ 0.25 $ 0.01 $ 0.43 $ 0.43 $ — $ 0.67 $ 0.68 $ 0.01 Diluted earnings per share: Net income attributable to GCP shareholders $ 0.24 $ 0.25 $ 0.01 $ 0.42 $ 0.42 $ — $ 0.66 $ 0.67 $ 0.01 Weighted average number of diluted shares 70.9 70.9 — 71.4 71.7 0.3 71.2 71.3 0.1 Consolidated Statement of Cash Flows Three Months Ended Six Months Ended (In millions) Previously Reported Revised Effect of Change Previously Reported Revised Effect of Change Net cash provided by operating activities $ 23.7 $ 24.5 $ 0.8 $ 52.0 $ 53.0 $ 1.0 Net cash provided by financing activities 15.6 14.8 (0.8 ) 9.2 8.2 (1.0 )

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories presented on GCP's Consolidated Balance Sheets consisted of the following: (In millions) September 30, December 31, Raw materials $ 46.7 $ 39.1 In process 6.4 6.2 Finished products and other 64.2 60.0 Total inventories $ 117.3 $ 105.3

Debt and Other Financial Inst26

Debt and Other Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Components of Debt	Components of Debt (In millions) September 30, December 31, 9.5% Senior Notes due 2023, net of unamortized debt issuance costs of $7.5 at September 30, 2016 $ 517.5 $ — Term Loan due 2022, net of unamortized discount of $2.5 and unamortized debt issuance costs of $4.5 at September 30, 2016 (1) 266.6 — Related party — 42.3 Other borrowings (2) 22.5 25.7 Total debt 806.6 68.0 Less debt payable within one year 23.2 68.0 Debt payable after one year $ 783.4 $ — Weighted average interest rates on related party debt — % 3.3 % Weighted average interest rates on total debt 7.6 % 11.9 % __________________________ (1) Interest at LIBOR + 325 bps with a 75 bps LIBOR floor at September 30, 2016 . (2) Represents borrowings under various lines of credit and other borrowings, primarily by non-U.S. subsidiaries.
Principal Maturities of Debt Outstanding	The principal maturities of debt outstanding (net of unamortized discounts and debt issuance costs) at September 30, 2016 , were as follows: (In millions) 2016 $ 17.7 2017 6.4 2018 3.4 2019 3.4 2020 3.4 Thereafter 772.3 Total debt $ 806.6
Carrying Amounts and Fair Values of Debt Instruments	At September 30, 2016 , the carrying amounts and fair values of GCP's debt were as follows: September 30, 2016 December 31, 2015 (In millions) Carrying Amount Fair Value Carrying Amount Fair Value 9.5% Senior Notes due 2023 $ 517.5 $ 601.1 $ — $ — Term Loan due 2022 266.6 276.7 — — Other borrowings 22.5 22.5 68.0 68.0 Total debt $ 806.6 $ 900.3 $ 68.0 $ 68.0

Pension Plans and Other Postr27

Pension Plans and Other Postretirement Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2016
Pension and Other Postretirement Benefit Expense [Abstract]
Net Funded Status of Over-Funded, Underfunded, and Unfunded Pension Plans	The following table presents the funded status of GCP's overfunded, underfunded and unfunded defined pension plans: (In millions) September 30, December 31, Overfunded defined benefit pension plans $ 24.4 $ 26.1 Underfunded defined benefit pension plans (47.2 ) (8.0 ) Unfunded defined benefit pension plans (35.6 ) (26.0 ) Total underfunded and unfunded defined benefit pension plans (82.8 ) (34.0 ) Pension liabilities included in other current liabilities (1.2 ) (1.1 ) Net funded status $ (59.6 ) $ (9.0 )
Components of Net Periodic Benefit Cost (Income)	Components of Net Periodic Benefit Cost (Income) Three Months Ended September 30, 2016 2015 Pension Other Post Pension Other Post (In millions) U.S. Non-U.S. U.S. Non-U.S. Service cost $ 1.6 $ 0.8 $ — $ 0.1 $ 0.8 $ — Interest cost 1.1 1.9 — 0.1 2.3 — Expected return on plan assets (1.2 ) (2.1 ) — (0.2 ) (2.8 ) — Amortization of net deferred actuarial loss — — 0.1 — — — Gain on termination and curtailment of pension and other postretirement plans — (0.2 ) — — — — Net periodic benefit cost (1) $ 1.5 $ 0.4 $ 0.1 $ — $ 0.3 $ — Nine Months Ended September 30, 2016 2015 Pension Other Post Pension Other Post (In millions) U.S. Non-U.S. U.S. Non-U.S. Service cost $ 4.6 $ 2.5 $ — $ 0.2 $ 2.3 $ — Interest cost 3.5 6.0 — 0.4 6.9 — Expected return on plan assets (3.7 ) (6.6 ) — (0.5 ) (8.3 ) — Amortization of prior service (credit) cost — (0.1 ) — 0.1 — Amortization of net deferred actuarial loss — — 0.1 — — — Gain on termination and curtailment of pension and other postretirement plans — (1.6 ) (1.0 ) — — — Net periodic benefit cost (income) (1) $ 4.4 $ 0.3 $ (1.0 ) $ 0.1 $ 1.0 $ — ___________________________________ (1) Includes expense that was allocated to Grace of $0.1 million for the nine months ended September 30, 2015 .

Other Balance Sheet Accounts (T

Other Balance Sheet Accounts (Tables)	9 Months Ended
	Sep. 30, 2016
Payables and Accruals [Abstract]
Schedule of Other Current Liabilities	(In millions) September 30, December 31, Other Current Liabilities Customer volume rebates $ 28.7 $ 33.5 Accrued compensation (1) 37.0 27.1 Income tax payable (2) 14.8 23.3 Accrued interest 8.3 3.9 Pension liabilities 1.2 1.1 Other accrued liabilities 43.0 36.6 Total other current liabilities $ 133.0 $ 125.5 ________________________________ (1) Accrued compensation in the table above includes salaries and wages as well as estimated current amounts due under the annual and long-term incentive programs. (2) Income tax items above do not include amounts due from/to Grace, which are reflected in other assets on the accompanying Consolidated Balance Sheets.

Restructuring and Repositioni29

Restructuring and Repositioning Expenses (Tables)	9 Months Ended
	Sep. 30, 2016
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Liability	Restructuring Liability (In millions) Total Balance, December 31, 2015 $ 1.4 Accruals for severance 1.4 Payments (2.8 ) Impact of foreign currency and other 1.4 Balance, September 30, 2016 $ 1.4
Schedule of Repositioning Expenses	For the three and nine months ended September 30, 2016 , GCP incurred repositioning expenses as follows: (In millions) Three Months Ended September 30, 2016 Nine Months Ended September 30, 2016 Professional fees $ 3.1 $ 7.3 Software and IT implementation fees 0.8 2.5 Employee-related costs 1.4 4.5 Total $ 5.3 $ 14.3

Other Comprehensive Income (L30

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Schedule of Pre-tax, Tax, and After-tax Components of Other Comprehensive Income (Loss)	The following tables present the pre-tax, tax, and after-tax components of GCP's other comprehensive income (loss) for the three and nine months ended September 30, 2016 and 2015 : Three Months Ended September 30, 2016 Pre-Tax Amount Tax Benefit/ (Expense) After-Tax Amount (In millions) Defined benefit pension and other postretirement plans: Amortization of net actuarial gain 0.1 — 0.1 Other changes in funded status $ (0.1 ) $ — $ (0.1 ) Benefit plans, net — — — Currency translation adjustments 3.0 — 3.0 Loss from hedging activities (0.1 ) — (0.1 ) Other comprehensive income attributable to GCP shareholders $ 2.9 $ — $ 2.9 Nine Months Ended September 30, 2016 Pre-Tax Amount Tax Benefit/ (Expense) After-Tax Amount (In millions) Defined benefit pension and other postretirement plans: Amortization of net prior service credit $ (0.1 ) $ — $ (0.1 ) Amortization of net actuarial gain 0.1 — 0.1 Assumption of net prior service credit 1.2 (0.4 ) 0.8 Assumption of net actuarial loss (1.1 ) 0.4 (0.7 ) Other changes in funded status (0.9 ) 0.3 (0.6 ) Benefit plans, net (0.8 ) 0.3 (0.5 ) Currency translation adjustments 3.5 — 3.5 Loss from hedging activities (0.1 ) — (0.1 ) Other comprehensive income attributable to GCP shareholders $ 2.6 $ 0.3 $ 2.9 Three Months Ended September 30, 2015 Pre-Tax Amount Tax Benefit/ (Expense) After-Tax Amount (In millions) Currency translation adjustments $ (19.7 ) $ — $ (19.7 ) Gain from hedging activities 0.3 (0.1 ) 0.2 Other comprehensive loss attributable to GCP shareholders $ (19.4 ) $ (0.1 ) $ (19.5 ) Nine Months Ended September 30, 2015 Pre-Tax Amount Tax Benefit/ (Expense) After-Tax Amount (In millions) Defined benefit pension and other postretirement plans: Amortization of net prior service cost $ 0.1 $ (0.1 ) $ — Benefit plans, net 0.1 (0.1 ) — Currency translation adjustments (39.1 ) — (39.1 ) Gain from hedging activities 0.4 (0.2 ) 0.2 Other comprehensive loss attributable to GCP shareholders $ (38.6 ) $ (0.3 ) $ (38.9 )
Schedule of Changes of Accumulated Other Comprehensive Income (Loss), Net of Tax	The following tables present the changes in accumulated other comprehensive income (loss), net of tax, for the nine months ended September 30, 2016 and 2015 : Nine Months Ended September 30, 2016 Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments (Losses) Gains from Hedging Activities Total (In millions) Beginning balance $ 0.1 $ (127.8 ) $ — $ (127.7 ) Other comprehensive income (loss) before reclassifications — 3.5 (1.2 ) 2.3 Amounts reclassified from accumulated other comprehensive (loss) income (0.5 ) — 1.1 0.6 Net current-period other comprehensive (loss) income (0.5 ) 3.5 (0.1 ) 2.9 Ending balance $ (0.4 ) $ (124.3 ) $ (0.1 ) $ (124.8 ) Nine Months Ended September 30, 2015 Defined Benefit Pension and Other Postretirement Plans Currency Translation Adjustments (Losses) Gains from Hedging Activities Total (In millions) Beginning balance $ (0.3 ) $ (65.5 ) $ (0.2 ) $ (66.0 ) Other comprehensive (loss) income before reclassifications — (39.1 ) 0.4 (38.7 ) Amounts reclassified from accumulated other comprehensive loss — — (0.2 ) (0.2 ) Net current-period other comprehensive (loss) income — (39.1 ) 0.2 (38.9 ) Ending balance $ (0.3 ) $ (104.6 ) $ — $ (104.9 )

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Assumptions for Estimating the Fair Value of Stock Options	The following summarizes GCP's assumptions for estimating the fair value of stock options granted during 2016 : Assumptions used to calculate expense for stock option Nine Months Ended September 30, 2016 Risk-free interest rate 0.93 - 1.24% Average life of options (years) 4 - 5 Volatility 29.6 – 33.2% Dividend yield — Average fair value per stock option $4.88
Summary of Stock Option Activity	The following table summarizes GCP stock option activity for the nine months ended September 30, 2016 : Stock Option Activity Number Of Weighted Weighted Aggregated Outstanding, December 31, 2015 — $ — Converted on February 3, 2016 2,236 14.36 Options exercised 757 9.68 Options forfeited 5 18.95 Options granted 748 17.18 Outstanding, September 30, 2016 2,222 16.90 3.81 $ 25,131 Exercisable September 30, 2016 945 $ 15.42 2.00 12,077
Summary of Restricted Stock Units Award Activity	GCP’s RSU activity for the nine months ended September 30, 2016 is as follows: RSU Activity Number Of Weighted Outstanding, December 31, 2015 — $ — Converted on February 3, 2016 265 17.00 RSUs settled 31 16.90 RSUs granted 323 17.11 RSUs outstanding, September 30, 2016 557 $ 17.07

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Reconciliation of the Numerators and Denominators Used in Calculating Basic and Diluted Earnings Per Share	The following table shows a reconciliation of the numerators and denominators used in calculating basic and diluted earnings (loss) per share: Three Months Ended September 30, Nine Months Ended September 30, (In millions, except per share amounts) 2016 2015 2016 2015 Numerators Net income (loss) attributable to GCP shareholders $ 21.3 $ (15.3 ) $ 69.4 $ 32.4 Denominators Weighted average common shares—basic calculation 71.0 70.5 70.8 70.5 Dilutive effect of employee stock awards 1.2 — 0.8 — Weighted average common shares—diluted calculation 72.2 70.5 71.6 70.5 Basic earnings (loss) per share $ 0.30 $ (0.22 ) $ 0.98 $ 0.46 Diluted earnings (loss) per share $ 0.30 $ (0.22 ) $ 0.97 $ 0.46

Related Party Transactions an33

Related Party Transactions and Transactions with Grace (Tables)	9 Months Ended
	Sep. 30, 2016
Related Party Transactions [Abstract]
Components of Net Transfers to Parent	The components of the net transfers to parent as of September 30, 2016 and 2015 are as follows: Nine Months Ended September 30, (In millions) 2016 2015 Cash pooling and general financing activities $ (685.1 ) $ (237.5 ) GCP expenses funded by parent 6.6 43.0 Corporate costs allocations 2.0 40.2 Provision for income taxes 4.3 58.2 Total net transfers to parent (672.2 ) (96.1 ) Other, net (92.4 ) 26.5 Transfers to parent, net per Consolidated Statements of Cash Flows $ (764.6 ) $ (69.6 )

Operating Segment Information (

Operating Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Schedule of Operating Segment Data	Operating Segment Data Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2016 2015 2016 2015 Net Sales Specialty Construction Chemicals $ 162.8 $ 201.9 $ 466.6 $ 534.2 Specialty Building Materials 100.6 102.0 318.5 297.6 Darex Packaging Technologies 79.1 85.8 237.8 254.3 Total $ 342.5 $ 389.7 $ 1,022.9 $ 1,086.1 Segment Operating Income Specialty Construction Chemicals segment operating income $ 23.2 $ 37.2 $ 53.7 $ 66.9 Specialty Building Materials segment operating income 25.6 26.7 88.9 73.3 Darex Packaging Technologies segment operating income 15.9 20.9 51.2 56.0 Total segment operating income $ 64.7 $ 84.8 $ 193.8 $ 196.2
Reconciliation of Operating Segment Data to Financial Statements	Total segment operating income for the three and nine months ended September 30, 2016 and 2015 , is reconciled below to income before income taxes presented in the accompanying Consolidated Statements of Operations. Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2016 2015 2016 2015 Total segment operating income $ 64.7 $ 84.8 $ 193.8 $ 196.2 Corporate costs (7.1 ) (5.9 ) (23.2 ) (16.5 ) Certain pension costs (2.1 ) (1.3 ) $ (6.3 ) $ (3.8 ) Currency and other financial losses in Venezuela — (73.2 ) — (73.2 ) Repositioning expenses (5.3 ) — (14.3 ) — Restructuring expenses (0.4 ) (2.3 ) (1.4 ) (9.9 ) Pension MTM adjustment and other related costs, net — — (2.7 ) (0.5 ) Gain on termination and curtailment of pension and other postretirement plans 0.2 — 2.6 — Third-party acquisition-related costs (0.3 ) — (0.3 ) — Net income attributable to noncontrolling interests 0.2 0.3 0.9 0.6 Other financing costs (1.2 ) — (1.2 ) — Interest expense, net (17.6 ) (0.6 ) (47.8 ) (1.7 ) Income before income taxes $ 31.1 $ 1.8 $ 100.1 $ 91.2
Schedule of Geographic Area Data	The table below presents information related to the geographic areas in which GCP operates. Sales are attributed to geographic areas based on customer location. Three Months Ended September 30, Nine Months Ended September 30, (In millions) 2016 2015 2016 2015 Net Sales United States $ 134.6 $ 133.0 $ 402.7 $ 378.3 Canada and Puerto Rico 9.2 8.6 25.2 22.9 Total North America 143.8 141.6 427.9 401.2 Europe Middle East Africa 79.5 88.9 249.3 260.7 Asia Pacific 81.9 83.3 242.6 248.6 Latin America 37.3 75.9 103.1 175.6 Total $ 342.5 $ 389.7 $ 1,022.9 $ 1,086.1

Basis of Presentation and Sum35

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies - Narrative (Details)	Feb. 03, 2016shares	Sep. 30, 2016segment
Class of Stock [Line Items]
Number of operating segments | segment		3
Maximum | W.R. Grace & Co.
Class of Stock [Line Items]
Transition period	18 months
Common Stock
Class of Stock [Line Items]
Number of GCP shares distributed for every share held by Grace stockholders | shares	1

Basis of Presentation and Sum36

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies - Currency Translation (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Feb. 13, 2013	Feb. 08, 2013	Jan. 01, 2010
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]
Foreign currency exchange rate, translation	654,290,000		654,290,000
Loss in Venezuela	$ 0	$ 59.6	$ 0	$ 59.6
Increase in currency exchange rate, in percentage	230.00%		230.00%
Other (Income) Expense, Net
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]
Foreign currency loss			$ 4.2
Venezuela
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]
Pre-tax charge reflect the devaluation of monetary assets and the impairment of non-monetary assets		$ 73.2
Venezuela | Bolivar
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]
Exchange rate used to remeasure financial statements upon Venezuela's designation as a highly inflationary economy					6.3	4.3	4.3
Foreign currency exchange rate, translation		199		199
Inventories
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]
Devaluation of monetary assets and liabilities		$ 13.7		$ 13.7

Basis of Presentation and Sum37

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies - Accounting for Stock Compensation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit	$ 0.9	$ 0.2	$ 0.8		$ 1	$ 1.9
Increase in cash provided by operating activities			24.5		53	73	$ 101.9
Decrease in cash provided by financing activities			(14.8)		(8.2)	(7.1)	84
Provision for income taxes	9.6	(12.6)	(7.6)	$ 16.8	(20.2)	29.8	58.2
Net income	21.5	30.6	18.2	(15)	48.8	70.3	33
Net income attributable to GCP shareholders	$ 21.3	$ 30.3	$ 17.8	$ (15.3)	$ 48.1	$ 69.4	$ 32.4
Basic earnings per share:
Net income (loss) attributable to GCP shareholders (in usd per share)	$ 0.30	$ 0.43	$ 0.25	$ (0.22)	$ 0.68	$ 0.98	$ 0.46
Diluted earnings per share:
Net income (loss) attributable to GCP shareholders (in usd per share)	$ 0.30	$ 0.42	$ 0.25	$ (0.22)	$ 0.67	$ 0.97	$ 0.46
Weighted average number of diluted shares	72.2	71.7	70.9	70.5	71.3	71.6	70.5
Net cash provided by operating activities			$ 24.5		$ 53	$ 73	$ 101.9
Net cash provided by financing activities			14.8		8.2	$ 7.1	$ (84)
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in cash provided by operating activities			0.8		1
Decrease in cash provided by financing activities			0.8		1
Diluted earnings per share:
Net cash provided by operating activities			0.8		1
Net cash provided by financing activities			(0.8)		(1)
Previously Reported | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in cash provided by operating activities			23.7		52
Decrease in cash provided by financing activities			(15.6)		(9.2)
Provision for income taxes		$ (12.8)	(8.4)		(21.2)
Net income		30.4	17.4		47.8
Net income attributable to GCP shareholders		$ 30.1	$ 17		$ 47.1
Basic earnings per share:
Net income (loss) attributable to GCP shareholders (in usd per share)		$ 0.43	$ 0.24		$ 0.67
Diluted earnings per share:
Net income (loss) attributable to GCP shareholders (in usd per share)		$ 0.42	$ 0.24		$ 0.66
Weighted average number of diluted shares		71.4	70.9		71.2
Net cash provided by operating activities			$ 23.7		$ 52
Net cash provided by financing activities			15.6		9.2
Effect of Change | Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in cash provided by operating activities			0.8		1
Decrease in cash provided by financing activities			0.8		1
Provision for income taxes		$ 0.2	0.8		1
Net income		0.2	0.8		1
Net income attributable to GCP shareholders		$ 0.2	$ 0.8		$ 1
Basic earnings per share:
Net income (loss) attributable to GCP shareholders (in usd per share)		$ 0	$ 0.01		$ 0.01
Diluted earnings per share:
Net income (loss) attributable to GCP shareholders (in usd per share)		$ 0	$ 0.01		$ 0.01
Weighted average number of diluted shares		0.3	0		0.1
Net cash provided by operating activities			$ 0.8		$ 1
Net cash provided by financing activities			$ (0.8)		$ (1)

Inventories - Schedule of Inven

Inventories - Schedule of Inventory (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 46.7	$ 39.1
In process	6.4	6.2
Finished products and other	64.2	60
Total inventories	$ 117.3	$ 105.3

Inventories - Narrative (Detail

Inventories - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Inventory [Line Items]
Finished products purchased	$ 64.2	$ 60
Finished Products Purchased
Inventory [Line Items]
Finished products purchased	$ 10.2	$ 8.6

Debt and Other Financial Inst40

Debt and Other Financial Instruments - Components of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 806.6	$ 68
Less debt payable within one year	23.2	68
Debt payable after one year	$ 783.4	$ 0
Weighted average interest rates	7.60%	11.90%
Senior Notes
Debt Instrument [Line Items]
Total debt	$ 517.5	$ 0
Term Loan
Debt Instrument [Line Items]
Total debt	266.6	0
Related Party
Debt Instrument [Line Items]
Total debt	$ 0	$ 42.3
Weighted average interest rates	0.00%	3.30%
Other Borrowings
Debt Instrument [Line Items]
Total debt	$ 22.5	$ 25.7

Debt and Other Financial Inst41

Debt and Other Financial Instruments - Components of Debt (Additional Information) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Jan. 27, 2016
Senior Notes
Debt Instrument [Line Items]
Stated interest rate	9.50%	9.50%
Unamortized debt issuance cost	$ 7.5
Term Loan
Debt Instrument [Line Items]
Unamortized debt issuance cost	4.5
Unamortized discount	$ 2.5
Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	325.00%
Variable interest rate, floor	75.00%

Debt and Other Financial Inst42

Debt and Other Financial Instruments - Principal Maturities of Debt Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
2,016	$ 17.7
2,017	6.4
2,018	3.4
2,019	3.4
2,020	3.4
Thereafter	772.3
Total debt	$ 806.6	$ 68

Debt and Other Financial Inst43

Debt and Other Financial Instruments - Narrative (Details) - USD ($)	Aug. 25, 2016	Aug. 24, 2016	Feb. 03, 2016	Mar. 31, 2016	Sep. 30, 2016	Jan. 27, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Distribution to Grace related to the Separation				$ 750,000,000
Debt proceeds retained to meet operating requirements and to pay fees associated with the Separation				50,000,000
Long-term debt					$ 806,600,000		$ 68,000,000
United States
Debt Instrument [Line Items]
Pledged equity to credit facilities, percentage			100.00%
United Kingdom
Debt Instrument [Line Items]
Pledged equity to credit facilities, percentage			65.00%
Term Loan
Debt Instrument [Line Items]
Long-term debt					$ 266,600,000		0
Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate					325.00%
Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount						$ 525,000,000
Stated interest rate					9.50%	9.50%
Debt issuance costs, gross				8,000,000
Long-term debt					$ 517,500,000		0
Related Party
Debt Instrument [Line Items]
Long-term debt					0		$ 42,300,000
Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 525,000,000
Secured Debt | Term Loan
Debt Instrument [Line Items]
Aggregate principal amount			$ 275,000,000
Annual amortization of debt, as percentage of original amount			1.00%
Outstanding draws on revolving loans	$ 274,300,000	$ 274,300,000
Accelerated amortization of debt issuance costs	100,000
Third party financing costs	$ 1,200,000
Debt issuance costs, gross				5,000,000
Secured Debt | Term Loan | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%	3.50%
Secured Debt | Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.25%	4.50%
Secured Debt | Revolving Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 250,000,000
Outstanding draws on revolving loans					0
Available credit under revolving loans					244,000,000
Outstanding letters of credit					6,000,000
Line of credit debt issuance costs, gross				$ 5,200,000
Line of credit, unamortized debt issuance costs					$ 4,500,000
Secured Debt | Revolving Credit | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					0.50%
Secured Debt | Revolving Credit | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					1.00%
Secured Debt | Revolving Credit | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					1.50%
Secured Debt | Revolving Credit | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					2.00%

Debt and Other Financial Inst44

Debt and Other Financial Instruments - Carrying Amounts and Fair Values of Debt Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2016	Jan. 27, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Carrying Amount	$ 806.6		$ 68
Level 2 Inputs
Debt Instrument [Line Items]
Fair Value	900.3		68
Senior Notes
Debt Instrument [Line Items]
Carrying Amount	$ 517.5		0
Stated interest rate	9.50%	9.50%
Senior Notes | Level 2 Inputs
Debt Instrument [Line Items]
Fair Value	$ 601.1		0
Term Loan
Debt Instrument [Line Items]
Carrying Amount	266.6		0
Term Loan | Level 2 Inputs
Debt Instrument [Line Items]
Fair Value	276.7		0
Other Borrowings
Debt Instrument [Line Items]
Carrying Amount	22.5		68
Other Borrowings | Level 2 Inputs
Debt Instrument [Line Items]
Fair Value	$ 22.5		$ 68

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 9.6	$ (12.6)	$ (7.6)	$ 16.8	$ (20.2)	$ 29.8	$ 58.2
Effective tax rate	(30.90%)			(933.30%)		(29.80%)	(63.80%)
Reduction in effective tax rate (percent)	2.90%					1.90%
Excess tax benefit	$ 0.9	$ 0.2	0.8		$ 1	$ 1.9
Increase in deferred tax assets in the US in conjunction with the Separation			$ 77
Repatriated foreign earnings from foreign subsidiaries transferred to GCP pursuant to the Separation								$ 173.1
Repatriation of foreign earnings, tax expense								$ 19.9
Repatriation of foreign earnings, effective tax rate								15.90%

Pension Plans and Other Postr46

Pension Plans and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended					9 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Feb. 03, 2016
Pension plans and other postretirement benefit plans
Gain on termination and curtailment of pension and other postretirement plans							$ 2.6	$ 0
Overfunded defined benefit pension plans		$ 24.4			$ 26.1		$ 24.4
Defined contribution retirement plan
Percentage that the employer contributes of employee contributions under 401(k) plan							100.00%
Maximum percentage of employee compensation match by employer to defined contribution plan							6.00%
Costs related to defined contribution retirement plan		1.2				$ 1.2	$ 3.4	3.8
Shared Plans
Pension plans and other postretirement benefit plans
Allocated pension expense								2.8
Postretirement Life Insurance Plans
Pension plans and other postretirement benefit plans
Increase to net pension liabilities				$ 0.1
Allocated income								1.2
Prior service credit assumed as part of acquisition, net of tax									$ 0.8
Actuarial losses, net of tax									$ 0.7
Gain on termination and curtailment of pension and other postretirement plans		1
Pension Plans
Pension plans and other postretirement benefit plans
Increase to net pension liabilities				$ 44	4
Overfunded defined benefit pension plans		24.4			26.1		24.4
Combined balance of underfunded and unfunded plans included as liabilities		84					84
Pension liabilities included in other current liabilities		1.2			1.1		1.2
Underfunded and unfunded defined benefit pension plans		82.8			$ 34		82.8
Non-U.S.
Pension plans and other postretirement benefit plans
Gain on termination and curtailment of pension and other postretirement plans		0.2	$ 1.4			0	1.6	0
U.S.
Pension plans and other postretirement benefit plans
Gain on termination and curtailment of pension and other postretirement plans		$ 0				$ 0	$ 0	$ 0
Accelerated contribution to the trusts	$ 1

Pension Plans and Other Postr47

Pension Plans and Other Postretirement Benefit Plans - Net Funded Status of Over-Funded, Underfunded, and Unfunded Pension Plans (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Pension plans and other postretirement benefit plans
Overfunded defined benefit pension plans	$ 24.4	$ 26.1
Underfunded defined benefit pension plans	(82.8)	(34)
Pension Plans
Pension plans and other postretirement benefit plans
Overfunded defined benefit pension plans	24.4	26.1
Underfunded defined benefit pension plans	(47.2)	(8)
Unfunded defined benefit pension plans	(35.6)	(26)
Total underfunded and unfunded defined benefit pension plans	(82.8)	(34)
Pension liabilities included in other current liabilities	(1.2)	(1.1)
Net funded status	$ (59.6)	$ (9)

Pension Plans and Other Postr48

Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Gain on termination and curtailment of pension and other postretirement plans				$ (2.6)	$ 0
W.R. Grace
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (income)					0.1
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.6		$ 0.1	4.6	0.2
Interest cost	1.1		0.1	3.5	0.4
Expected return on plan assets	(1.2)		(0.2)	(3.7)	(0.5)
Amortization of prior service (credit) cost				0	0
Amortization of net deferred actuarial loss	0		0	0	0
Gain on termination and curtailment of pension and other postretirement plans	0		0	0	0
Net periodic benefit cost (income)	1.5		0	4.4	0.1
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.8		0.8	2.5	2.3
Interest cost	1.9		2.3	6	6.9
Expected return on plan assets	(2.1)		(2.8)	(6.6)	(8.3)
Amortization of prior service (credit) cost					0.1
Amortization of net deferred actuarial loss	0		0	0	0
Gain on termination and curtailment of pension and other postretirement plans	(0.2)	$ (1.4)	0	(1.6)	0
Net periodic benefit cost (income)	0.4		0.3	0.3	1
Other Post Retirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0		0	0	0
Interest cost	0		0	0	0
Expected return on plan assets	0		0	0	0
Amortization of prior service (credit) cost				(0.1)	0
Amortization of net deferred actuarial loss	0.1		0	0.1	0
Gain on termination and curtailment of pension and other postretirement plans	0		0	(1)	0
Net periodic benefit cost (income)	$ 0.1		$ 0	$ (1)	$ 0

Other Balance Sheet Accounts (D

Other Balance Sheet Accounts (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Other Current Liabilities
Customer volume rebates	$ 28.7	$ 33.5
Accrued compensation	37	27.1
Income tax payable	14.8	23.3
Accrued interest	8.3	3.9
Pension liabilities	1.2	1.1
Other accrued liabilities	43	36.6
Total other current liabilities	$ 133	$ 125.5

Commitments and Contingent Li50

Commitments and Contingent Liabilities (Details) $ in Millions	Sep. 30, 2016USD ($)
Standby Letter of Credit
Loss Contingencies [Line Items]
Gross financial assurances issued and outstanding	$ 6

Restructuring and Repositioni51

Restructuring and Repositioning Expenses - Narrative (Details) - USD ($) $ in Millions	Feb. 03, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Changes in Business Environment and Structure
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		$ 0.4	$ 2.3	$ 1.4	$ 9.9
Restructuring liabilities		1.4		1.4		$ 1.4
Total cash payments for repositioning costs				2.8
Changes in Business Environment and Structure | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities		1.4		1.4		$ 1.4
Changes in Business Environment and Structure | SCC
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		0.3	1.3	0.8	5.7
Changes in Business Environment and Structure | SBM
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		0.1	0.4	0.6	2.7
Changes in Business Environment and Structure | Darex
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			0.6		1.5
Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		$ 5.3	$ 0	14.3	$ 0
Estimated period for transition expenses to be incurred	18 months
Repositioning | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated transition expenses	$ 18
Repositioning | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated transition expenses	$ 20
Repositioning | Professional Fees and Employee-Related Costs
Restructuring Cost and Reserve [Line Items]
Total cash payments for repositioning costs				14.7
Repositioning | Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Total cash payments for repositioning costs				5.7
Repositioning | Taxes
Restructuring Cost and Reserve [Line Items]
Total cash payments for repositioning costs				$ 6.9

Restructuring and Repositioni52

Restructuring and Repositioning Expenses - Restructuring Liability (Details) - Changes in Business Environment and Structure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Liability (In millions)
Balance, December 31, 2015			$ 1.4
Accruals for severance	$ 0.4	$ 2.3	1.4	$ 9.9
Payments			(2.8)
Impact of foreign currency and other			1.4
Balance, September 30, 2016	$ 1.4		$ 1.4

Restructuring and Repositioni53

Restructuring and Repositioning Expenses - Repositioning Expenses (Details) - Repositioning - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 5.3	$ 0	$ 14.3	$ 0
Professional fees
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3.1		7.3
Software and IT implementation fees
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.8		2.5
Employee-related costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 1.4		$ 4.5

Other Comprehensive Income (L54

Other Comprehensive Income (Loss) - Pre-Tax, Tax, and After-Tax Components of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
After-Tax Amount
Total other comprehensive income (loss)	$ 2.9	$ (20)	$ 3.1	$ (39.2)
Other comprehensive income attributable to GCP shareholders
Pre-Tax Amount
Other comprehensive income (loss), pre-tax	2.9	(19.4)	2.6	(38.6)
Tax Benefit/ (Expense)
Other comprehensive income (loss), tax	0	(0.1)	0.3	(0.3)
After-Tax Amount
Amortization of net prior service cost included in net periodic benefit cost, after-tax			(0.6)	0.2
Assumption of net prior service credit and net actuarial loss, after-tax			2.3	(38.7)
Total other comprehensive income (loss)	2.9	(19.5)	2.9	(38.9)
Amortization of net prior service credit
Pre-Tax Amount
Amortization of net prior service cost included in net periodic benefit cost, pre-tax				0.1
Assumption of net prior service credit and net actuarial loss, pre-tax			(0.1)
Tax Benefit/ (Expense)
Amortization of net prior service cost included in net periodic benefit cost, tax				(0.1)
Assumption of net prior service credit and net actuarial loss, tax			0
After-Tax Amount
Amortization of net prior service cost included in net periodic benefit cost, after-tax				0
Assumption of net prior service credit and net actuarial loss, after-tax			(0.1)
Amortization of net actuarial gain
Pre-Tax Amount
Assumption of net prior service credit and net actuarial loss, pre-tax	0.1		0.1
Tax Benefit/ (Expense)
Assumption of net prior service credit and net actuarial loss, tax	0		0
After-Tax Amount
Assumption of net prior service credit and net actuarial loss, after-tax	0.1		0.1
Assumption of net prior service credit
Pre-Tax Amount
Assumption of net prior service credit and net actuarial loss, pre-tax			1.2
Tax Benefit/ (Expense)
Assumption of net prior service credit and net actuarial loss, tax			(0.4)
After-Tax Amount
Assumption of net prior service credit and net actuarial loss, after-tax			0.8
Assumption of net actuarial loss
Pre-Tax Amount
Assumption of net prior service credit and net actuarial loss, pre-tax			(1.1)
Tax Benefit/ (Expense)
Assumption of net prior service credit and net actuarial loss, tax			0.4
After-Tax Amount
Assumption of net prior service credit and net actuarial loss, after-tax			(0.7)
Other changes in funded status
Pre-Tax Amount
Assumption of net prior service credit and net actuarial loss, pre-tax	(0.1)		(0.9)
Tax Benefit/ (Expense)
Assumption of net prior service credit and net actuarial loss, tax	0		0.3
After-Tax Amount
Assumption of net prior service credit and net actuarial loss, after-tax	(0.1)		(0.6)
Benefit plans, net
Pre-Tax Amount
Other comprehensive income (loss), pre-tax	0		(0.8)	0.1
Tax Benefit/ (Expense)
Other comprehensive income (loss), tax	0		0.3	(0.1)
After-Tax Amount
Amortization of net prior service cost included in net periodic benefit cost, after-tax			0.5	0
Assumption of net prior service credit and net actuarial loss, after-tax			0	0
Total other comprehensive income (loss)	0		(0.5)	0
Currency translation adjustments
Pre-Tax Amount
Other comprehensive income (loss), pre-tax	3	(19.7)	3.5	(39.1)
Tax Benefit/ (Expense)
Other comprehensive income (loss), tax	0	0	0	0
After-Tax Amount
Amortization of net prior service cost included in net periodic benefit cost, after-tax			0	0
Assumption of net prior service credit and net actuarial loss, after-tax			3.5	(39.1)
Total other comprehensive income (loss)	3	(19.7)	3.5	(39.1)
Gain (loss) from hedging activities
Pre-Tax Amount
Other comprehensive income (loss), pre-tax	(0.1)	0.3	(0.1)	0.4
Tax Benefit/ (Expense)
Other comprehensive income (loss), tax	0	(0.1)	0	(0.2)
After-Tax Amount
Amortization of net prior service cost included in net periodic benefit cost, after-tax			(1.1)	0.2
Assumption of net prior service credit and net actuarial loss, after-tax			(1.2)	0.4
Total other comprehensive income (loss)	$ (0.1)	$ 0.2	$ (0.1)	$ 0.2

Other Comprehensive Income (L55

Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)country	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)country	Sep. 30, 2015USD ($)
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			$ 474.1	$ 607.4
Total other comprehensive income (loss)	$ 2.9	$ (20)	3.1	(39.2)
Ending balance	$ (118.4)	505.1	$ (118.4)	505.1
Number of countries in which entity operates, more than | country	40		40
Defined Benefit Pension and Other Postretirement Plans
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			$ 0.1	(0.3)
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive (loss) income			(0.5)	0
Total other comprehensive income (loss)	$ 0		(0.5)	0
Ending balance	(0.4)	(0.3)	(0.4)	(0.3)
Currency Translation Adjustments
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			(127.8)	(65.5)
Other comprehensive income (loss) before reclassifications			3.5	(39.1)
Amounts reclassified from accumulated other comprehensive (loss) income			0	0
Total other comprehensive income (loss)	3	(19.7)	3.5	(39.1)
Ending balance	(124.3)	(104.6)	(124.3)	(104.6)
(Losses) Gains from Hedging Activities
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			0	(0.2)
Other comprehensive income (loss) before reclassifications			(1.2)	0.4
Amounts reclassified from accumulated other comprehensive (loss) income			1.1	(0.2)
Total other comprehensive income (loss)	(0.1)	0.2	(0.1)	0.2
Ending balance	(0.1)	0	(0.1)	0
Total
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance			(127.7)	(66)
Other comprehensive income (loss) before reclassifications			2.3	(38.7)
Amounts reclassified from accumulated other comprehensive (loss) income			0.6	(0.2)
Total other comprehensive income (loss)	2.9	(19.5)	2.9	(38.9)
Ending balance	$ (124.8)	$ (104.9)	$ (124.8)	$ (104.9)

Stock Incentive Plans - Narrati

Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 03, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total cash and non-cash stock-based compensation cost		$ 2	$ 0.9	$ 5.6	$ 2.8
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares repurchased				96,270
Total unrecognized compensation expense related to the RSU and PBU awards		7.9		$ 7.9
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, exercise price, percent of market value on the date of grant				100.00%
Stock option awards, contractual term				5 years
Award vesting period	3 years
Intrinsic value of all options exercised				$ 8.7
Unrecognized stock-based compensation expense for stock options		$ 2.5		$ 2.5
Unrecognized stock-based compensation expense for stock options, period of recognition				1 year 3 months 18 days
Stock Option | Vesting 1, Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.33%
Stock Option | Vesting 1, Year 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.33%
Stock Option | Vesting 1, Year 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.33%
Stock Option | W.R. Grace
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards, contractual term	7 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Fully vested awards settled in shares				25,000
Fully vested awards settled in cash				$ 0.5
Percent of units expected to settle in cash, vesting in 2016		41.00%		41.00%
Shares vesting in 2016		80,621		80,621
Percent of units expected to settle in cash, vesting in 2017		0.00%		0.00%
Shares vesting in 2017		68,211		68,211
Percent of units expected to settle in cash, vesting in 2018		37.00%		37.00%
Shares vesting in 2018		162,707		162,707
Percent of units expected to settle in cash, vesting in 2019		0.00%		0.00%
Shares vesting in 2019		245,176		245,176
Awards granted (in shares)				323,000
Weighted average grant date fair value (in usd per share)				$ 17.11
Restricted Stock Units (RSUs) | Vesting 1, Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.33%
Restricted Stock Units (RSUs) | Vesting 1, Year 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.33%
Restricted Stock Units (RSUs) | Vesting 1, Year 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.33%
Restricted Stock Units (RSUs) | Vesting 2, Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	0.00%
Restricted Stock Units (RSUs) | Vesting 2, Year 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	0.00%
Restricted Stock Units (RSUs) | Vesting 2, Year 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	100.00%
Sign-On Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Award vesting percentage	100.00%
Restricted Stock Units (RSUs) and Performance Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense for stock options, period of recognition				1 year 8 months 12 days
2016 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares repurchased				96,270
Number of shares of common stock available for issuance		1,641,952		1,641,952
2016 Stock Incentive Plan | Performance Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)				155,501
Weighted average grant date fair value (in usd per share)				$ 17.04
Percent of units expected to settle in common stock		100.00%		100.00%
Performance period				3 years
2016 Stock Incentive Plan | Performance Based Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout, percent of target				0.00%
2016 Stock Incentive Plan | Performance Based Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout, percent of target				200.00%

Stock Incentive Plans - Expense

Stock Incentive Plans - Expenses Related to Stock Options Granted, Valuation Assumptions (Details) - Stock Option	9 Months Ended
	Sep. 30, 2016$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	0.93%
Risk-free interest rate, maximum	1.24%
Volatility, minimum	29.60%
Volatility, maximum	33.20%
Dividend yield	0.00%
Average fair value per stock option (in usd per share)	$ 4.88
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average life of options (years)	4 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average life of options (years)	5 years

Stock Incentive Plans - Stock O

Stock Incentive Plans - Stock Option Activity (Details) - Stock Option $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)$ / sharesshares
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares) | shares	0
Converted on February 3, 2016 (in shares) | shares	2,236
Options exercised (in shares) | shares	757
Options forfeited (in shares) | shares	5
Options granted (in shares) | shares	748
Outstanding, end balance (in shares) | shares	2,222
Exercisable, end of period (in shares) | shares	945
Weighted Average Exercise Price
Outstanding, beginning balance (in usd per share) | $ / shares	$ 0
Converted on February 3, 2016 (in usd per share) | $ / shares	14.36
Options exercised (in usd per share) | $ / shares	9.68
Options forfeited (in usd per share) | $ / shares	18.95
Options granted (in usd per share) | $ / shares	17.18
Outstanding, ending balance (in usd per share) | $ / shares	16.90
Exercisable, end of period (in usd per share) | $ / shares	$ 15.42
Other Disclosures
Outstanding, weighted-average remaining contractual term	3 years 9 months 22 days
Exercisable, weighted-average remaining contractual term	2 years
Outstanding, aggregated intrinsic value | $	$ 25,131
Exercisable, aggregated intrinsic value | $	$ 12,077

Stock Incentive Plans - Restric

Stock Incentive Plans - Restricted Stock Units Award Activity (Details) - Restricted Stock Units (RSUs) shares in Thousands	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares) | shares	0
Converted on February 3, 2016 (in shares) | shares	265
RSUs settled (in shares) | shares	31
RSUs granted (in shares) | shares	323
RSUs outstanding, ending balance (in shares) | shares	557
Weighted Average Grant Date Fair Value
Outstanding, beginning balance (in usd per share) | $ / shares	$ 0
Converted on February 3, 2016 (in usd per share) | $ / shares	17
RSUs settled (in usd per share) | $ / shares	16.90
RSUs granted (in usd per share) | $ / shares	17.11
RSUs outstanding, ending balance (in usd per share) | $ / shares	$ 17.07

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Numerators
Net income (loss) attributable to GCP shareholders	$ 21.3	$ 30.3	$ 17.8	$ (15.3)	$ 48.1	$ 69.4	$ 32.4
Denominators
Weighted average common shares—basic calculation	71,000,000			70,500,000		70,800,000	70,500,000
Dilutive effect of employee stock awards (in shares)	1,200,000			0		800,000	0
Weighted average common shares—diluted calculation	72,200,000	71,700,000	70,900,000	70,500,000	71,300,000	71,600,000	70,500,000
Basic earnings (loss) per share (in usd per share)	$ 0.30	$ 0.43	$ 0.25	$ (0.22)	$ 0.68	$ 0.98	$ 0.46
Diluted earnings (loss) per share (in usd per share)	$ 0.30	$ 0.42	$ 0.25	$ (0.22)	$ 0.67	$ 0.97	$ 0.46
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares repurchased in connection with equity compensation programs						96,270
Value of common stock repurchased in connection with equity compensation programs						$ 1.8
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0					100,000
Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0					200,000

Related Party Transactions an61

Related Party Transactions and Transactions with Grace - Related Party Expenses and Agreements (Details) - W.R. Grace & Co. - USD ($)	Feb. 03, 2016	Feb. 03, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Related Party Transaction [Line Items]
Allocated general corporate expenses		$ 2,000,000	$ 0	$ 13,300,000		$ 40,200,000
Indemnified receivables, tax					$ 7,000,000
Maximum
Related Party Transaction [Line Items]
Transition period	18 months
Other current assets
Related Party Transaction [Line Items]
Indemnified receivables, tax					2,500,000
Other noncurrent assets
Related Party Transaction [Line Items]
Indemnified receivables, tax					$ 4,500,000

Related Party Transactions an62

Related Party Transactions and Transactions with Grace - Parent Company Equity (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Related Party Transaction [Line Items]
Total net transfers to parent		$ (672.2)	$ (96.1)
Distribution to Grace related to the Separation	$ 750
W.R. Grace & Co.
Related Party Transaction [Line Items]
Total net transfers to parent		(672.2)	(96.1)
Other, net		(92.4)	26.5
Transfers to parent, net per Consolidated Statements of Cash Flows		(764.6)	(69.6)
W.R. Grace & Co. | Cash pooling and general financing activities
Related Party Transaction [Line Items]
Total net transfers to parent		(685.1)	(237.5)
W.R. Grace & Co. | GCP expenses funded by parent
Related Party Transaction [Line Items]
Total net transfers to parent		6.6	43
W.R. Grace & Co. | Corporate costs allocations
Related Party Transaction [Line Items]
Total net transfers to parent		2	40.2
W.R. Grace & Co. | Provision for income taxes
Related Party Transaction [Line Items]
Total net transfers to parent		4.3	$ 58.2
W.R. Grace & Co. | Net pension liabilities
Related Party Transaction [Line Items]
Other, net		(44)
W.R. Grace & Co. | Fixed assets
Related Party Transaction [Line Items]
Other, net		(23)
W.R. Grace & Co. | Related party debt, deferred tax, and other
Related Party Transaction [Line Items]
Other, net		$ (42)

Operating Segment Information -

Operating Segment Information - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)segment	Sep. 30, 2015USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			3
Corporate costs and pension costs excluded from segment operating income | $	$ 9.2	$ 7.2	$ 29.5	$ 20.3

Operating Segment Information64

Operating Segment Information - Schedule of Operating Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Sales
Net sales	$ 342.5	$ 389.7	$ 1,022.9	$ 1,086.1
Segment Operating Income
Total segment operating income	64.7	84.8	193.8	196.2
Operating Segments
Segment Operating Income
Total segment operating income	64.7	84.8	193.8	196.2
Operating Segments | Specialty Construction Chemicals
Net Sales
Net sales	162.8	201.9	466.6	534.2
Segment Operating Income
Operating income	23.2	37.2	53.7	66.9
Operating Segments | Specialty Building Materials
Net Sales
Net sales	100.6	102	318.5	297.6
Segment Operating Income
Operating income	25.6	26.7	88.9	73.3
Operating Segments | Darex Packaging Technologies
Net Sales
Net sales	79.1	85.8	237.8	254.3
Segment Operating Income
Operating income	$ 15.9	$ 20.9	$ 51.2	$ 56

Operating Segment Information65

Operating Segment Information - Reconciliation of Operating Segment Data to Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total segment operating income	$ 64.7	$ 84.8	$ 193.8	$ 196.2
Corporate costs	(75)	(72.9)	(220.4)	(217.5)
Currency and other financial losses in Venezuela			(4.2)	(73.2)
Gain on termination and curtailment of pension and other postretirement plans			2.6	0
Net income attributable to noncontrolling interests	0.2	0.3	0.9	0.6
Income before income taxes	31.1	1.8	100.1	91.2
Repositioning
Segment Reporting Information [Line Items]
Restructuring expenses	(5.3)	0	(14.3)	0
Changes in Business Environment and Structure
Segment Reporting Information [Line Items]
Restructuring expenses	(0.4)	(2.3)	(1.4)	(9.9)
Operating Segments
Segment Reporting Information [Line Items]
Total segment operating income	64.7	84.8	193.8	196.2
Corporate
Segment Reporting Information [Line Items]
Corporate costs	(7.1)	(5.9)	(23.2)	(16.5)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Certain pension costs	(2.1)	(1.3)	(6.3)	(3.8)
Currency and other financial losses in Venezuela	0	(73.2)	0	(73.2)
Pension MTM adjustment and other related costs, net	0	0	(2.7)	(0.5)
Gain on termination and curtailment of pension and other postretirement plans	0.2	0	2.6	0
Third-party acquisition-related costs	(0.3)	0	(0.3)	0
Net income attributable to noncontrolling interests	0.2	0.3	0.9	0.6
Other financing costs	(1.2)	0	(1.2)	0
Interest expense, net	(17.6)	(0.6)	(47.8)	(1.7)
Segment Reconciling Items | Repositioning
Segment Reporting Information [Line Items]
Restructuring expenses	(5.3)	0	(14.3)	0
Segment Reconciling Items | Changes in Business Environment and Structure
Segment Reporting Information [Line Items]
Restructuring expenses	$ (0.4)	$ (2.3)	$ (1.4)	$ (9.9)

Operating Segment Information66

Operating Segment Information - Geographic Area Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net sales	$ 342.5	$ 389.7	$ 1,022.9	$ 1,086.1
Total North America
Segment Reporting Information [Line Items]
Net sales	143.8	141.6	427.9	401.2
United States
Segment Reporting Information [Line Items]
Net sales	134.6	133	402.7	378.3
Canada and Puerto Rico
Segment Reporting Information [Line Items]
Net sales	9.2	8.6	25.2	22.9
Europe Middle East Africa
Segment Reporting Information [Line Items]
Net sales	79.5	88.9	249.3	260.7
Asia Pacific
Segment Reporting Information [Line Items]
Net sales	81.9	83.3	242.6	248.6
Latin America
Segment Reporting Information [Line Items]
Net sales	$ 37.3	$ 75.9	$ 103.1	$ 175.6

Subsequent Event (Details)

Subsequent Event (Details) - Subsequent Event $ in Millions	Nov. 09, 2016USD ($)
Halex Corporation
Subsequent Event [Line Items]
Percentage of stock acquired	100.00%
Cash payment to acquire business	$ 47
Annual net sales of Halex	45
Secured Debt | Revolving Credit
Subsequent Event [Line Items]
Proceeds from lines of credit	$ 25