W.R. Grace & Co. (GRA) 10-Q 7 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014
Document and Entity Information	'	'
Entity Registrant Name	'W R GRACE & CO	'
Entity Central Index Key	'0001045309	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	74,829,105
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (unaudited) (USD $)	3 Months Ended		6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net sales	$838	$802.80	$1,582.50	$1,512.70
Cost of goods sold	517.1	501.9	992.4	952.8
Gross profit	320.9	300.9	590.1	559.9
Selling, general and administrative expenses	144	142.1	280.8	275.4
Research and development expenses	20.3	16.6	40.8	33.5
Interest expense and related financing costs	11.1	10.9	22.3	21.4
Interest accretion on deferred payment obligations	13.6	0	21.8	0
Gain on termination of postretirement plans	-7.9	0	-7.9	0
Chapter 11 expenses, net of interest income	3	3.3	9.1	8.1
Equity in earnings of unconsolidated affiliate	-3.1	-9.2	-6.8	-14.3
Other expense, net	10.9	3.9	20.9	11.8
Total costs and expenses	191.9	167.6	381	335.9
Income before income taxes	129	133.3	209.1	224
Benefit from (provision for) income taxes	7.7	-42.5	-22.1	-73.8
Net income	136.7	90.8	187	150.2
Less: Net income attributable to noncontrolling interests	-0.5	-0.5	-0.7	-0.8
Net income attributable to W. R. Grace & Co. shareholders	$136.20	$90.30	$186.30	$149.40
Basic earnings per share:	'	'	'	'
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$1.79	$1.18	$2.44	$1.97
Weighted average number of basic shares	75.9	76.3	76.5	76
Diluted earnings per share:	'	'	'	'
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$1.77	$1.16	$2.40	$1.93
Weighted average number of diluted shares	76.8	77.6	77.5	77.4

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (unaudited) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$136.70	$90.80	$187	$150.20
Other comprehensive income (loss):	'	'	'	'
Defined benefit pension and other postretirement plans, net of income taxes	21.9	3.1	21.8	3.2
Currency translation adjustments	7.3	-16.9	5.2	-23.3
Gain (loss) from hedging activities, net of income taxes	-2.4	-0.8	-1.7	-0.4
Gain on securities available for sale	-0.6	0	-0.5	0
Total other comprehensive income (loss) attributable to noncontrolling interests	0	-0.4	0.1	-0.2
Total other comprehensive income	26.2	-15	24.9	-20.7
Comprehensive income	162.9	75.8	211.9	129.5
Less: comprehensive income attributable to noncontrolling interests	-0.5	-0.1	-0.8	-0.6
Comprehensive income attributable to W. R. Grace & Co. shareholders	$162.40	$75.70	$211.10	$128.90

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (unaudited) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES	'	'
Net income	$187	$150.20
Reconciliation to net cash (used for) provided by operating activities:	'	'
Depreciation and amortization	68	61.8
Equity in earnings of unconsolidated affiliate	-6.8	-14.3
Dividends received from unconsolidated affiliate	11.2	2.8
Chapter 11 expenses, net of interest income	9.1	8.1
Chapter 11 expenses paid	-20.7	-7.1
Asbestos and bankruptcy related charges, net	6.4	0
Cash paid to resolve contingencies subject to Chapter 11	-1,315.80	0
Provision for income taxes	22.1	73.8
Income taxes paid, net of refunds	-16.4	-26.9
Interest accretion on deferred payment obligations	21.8	0
Interest accrued on credit arrangements	4.2	0
Interest accrued on pre-petition liabilities subject to compromise	3.4	18.4
Pension and Other Postretirement Benefit Expense	11.5	16.1
Payments under defined benefit pension arrangements	-89.1	-58
Expenditures for environmental remediation	-7	-6.3
Changes in assets and liabilities, excluding effect of currency translation:	'	'
Trade accounts receivable	-57.4	-3.3
Inventories	-39.8	-37
Accounts payable	20.3	37.1
All other items, net	1.7	-45.1
Net cash provided by (used for) operating activities	-1,186.30	170.3
INVESTING ACTIVITIES	'	'
Capital expenditures	-81.5	-73.7
Transfer to restricted cash and cash equivalents	395.4	29.1
Payments to Acquire Businesses, Net of Cash Acquired	0	15.8
Payments for (Proceeds from) Short-term Investments	0	-500
Other investing activities	-1.6	2.3
Net cash used for investing activities	312.3	-558.1
FINANCING ACTIVITIES	'	'
Borrowings under credit arrangements	1,101.10	18.6
Repayments under credit arrangements	-662.2	-35.6
Proceeds from exercise of stock options	12.5	25.2
Payments of Financing Costs	23.9	0
Payments for Repurchase of Common Stock	-233.7	0
Other financing activities	1.1	1.8
Net cash (used for) provided by financing activities	194.9	10
Effect of currency exchange rate changes on cash and cash equivalents	-1.8	-16.7
Decrease in cash and cash equivalents	-680.9	-394.5
Cash and cash equivalents, beginning of period	964.8	1,336.90
Cash and cash equivalents, end of period	$283.90	$942.40

Consolidated_Balance_Sheets_un

Consolidated Balance Sheets (unaudited) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets	'	'
Cash and cash equivalents	$283.90	$964.80
Restricted cash and cash equivalents	0	395.4
Trade accounts receivable, less allowance of $6.4 (2013—$6.0)	539.9	481.8
Inventories	334.6	295.3
Deferred income taxes	215.3	58.1
Other current assets	92.3	99
Total Current Assets	1,466	2,294.40
Properties and equipment, net of accumulated depreciation and amortization of $1,921.7 (2013—$1,876.8)	835.2	829.9
Goodwill	467.7	457.5
Technology and other intangible assets, net	305.2	315.5
Deferred income taxes	619.9	845.9
Asbestos-related insurance	0	500
Overfunded defined benefit pension plans	45.7	16.7
Investment in unconsolidated affiliate	102.7	96.2
Other assets	61.4	40
Total Assets	3,903.80	5,396.10
Current Liabilities	'	'
Debt payable within one year	157.4	81.1
Accounts payable	311.5	262.5
PI warrant liability	490	0
Income tax contingencies	32.6	32
Other current liabilities	320.5	292
Total Current Liabilities	1,279.40	635.6
Debt payable after one year	916	29.6
Deferred payment obligations	616.3	0
Deferred income taxes	18.1	18.2
Liability for Uncertain Tax Positions, Noncurrent	19.4	5
Underfunded and unfunded defined benefit pension plans	343.1	299.6
Other liabilities	140.7	60.8
Total Liabilities Not Subject to Compromise	3,333	1,048.80
Liabilities Subject to Compromise-Note 2	'	'
Liabilities Subject to Compromise—Note 2	0	3,776.10
Total Liabilities	3,333	4,824.90
Commitments and Contingencies	'	'
Equity	'	'
Common stock issued, par value $0.01; 300,000,000 shares authorized; outstanding: 75,145,799 (2013—77,046,143)	0.8	0.8
Paid-in capital	541.4	533.4
Retained earnings	202.1	15.8
Treasury stock, at cost: shares: 2,301,449 (2013—0)	-220.3	0
Accumulated other comprehensive income	35.4	10.6
Total W. R. Grace & Co. Shareholders' Equity	559.4	560.6
Noncontrolling interests	11.4	10.6
Total Equity	570.8	571.2
Total Liabilities and Equity	$3,903.80	$5,396.10

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Trade accounts receivable, allowance	$6.40	$6
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment and Capitalized Computer Software, Total	$1,921.70	$1,876.80
Common stock issued, par value (in dollars per share)	$0.01	$0.01
Common stock issued, shares authorized	300,000,000	300,000,000
Common stock issued, shares outstanding	75,145,799	77,046,143
Treasury stock, shares	2,301,449	0

Consolidated_Statements_of_Equ

Consolidated Statements of Equity (unaudited) (USD $)	Total	Common Stock and Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interests
In Millions, unless otherwise specified
Balance at Dec. 31, 2012	$319.80	$537.30	($240.30)	($16.80)	$29.70	$9.90
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'
Net income	150.2	0	'	0	0	0.8
Net Income (Loss) Available to Common Stockholders, Basic	149.4	'	149.4	'	'	'
Payments for Repurchase of Common Stock	0	'	'	'	'	'
Stock plan activity	7.7	7.7	0	0	0	0
Stock Issued During Period, Value, Stock Options Exercised	25.2	13.3	0	11.9	0	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	0.8	0.8	0	0	0	0
Other comprehensive income	-20.7	0	0	0	-20.5	-0.2
Balance at Jun. 30, 2013	483	559.1	-90.9	-4.9	9.2	10.5
Balance at Dec. 31, 2013	571.2	534.2	15.8	0	10.6	10.6
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'
Net income	187	0	186.3	0	0	0.7
Net Income (Loss) Available to Common Stockholders, Basic	186.3	'	'	'	'	'
Payments for Repurchase of Common Stock	-233.7	0	0	-233.7	0	0
Stock plan activity	6.5	6.5	0	0	0	0
Stock Issued During Period, Value, Stock Options Exercised	12.5	-0.9	0	13.4	0	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	0.5	0.5	0	0	0	0
Shares issued	1.9	1.9	0	0	0	0
Other comprehensive income	24.9	0	0	0	24.8	0.1
Balance at Jun. 30, 2014	$570.80	$542.20	$202.10	($220.30)	$35.40	$11.40

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies	6 Months Ended
	Jun. 30, 2014
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
	W. R. Grace & Co., through its subsidiaries, is engaged in specialty chemicals and specialty materials businesses on a global basis through three operating segments: Grace Catalysts Technologies, which includes catalysts and related products and technologies used in refining, petrochemical and other chemical manufacturing applications; Grace Materials Technologies, which includes packaging technologies and engineered materials used in consumer, industrial, coatings, and pharmaceutical applications; and Grace Construction Products, which includes specialty construction chemicals and specialty building materials used in commercial, infrastructure and residential construction.
	W. R. Grace & Co. conducts all of its business through a single wholly owned subsidiary, W. R. Grace & Co.-Conn. ("Grace-Conn."). Grace-Conn. owns all of the assets, properties and rights of W. R. Grace & Co. on a consolidated basis, either directly or through subsidiaries.
	As used in these notes, the term "Company" refers to W. R. Grace & Co. The term "Grace" refers to the Company and/or one or more of its subsidiaries and, in certain cases, their respective predecessors.
	Chapter 11 Proceedings    During 2000 and the first quarter of 2001, Grace experienced several adverse developments in its asbestos-related litigation, including: a significant increase in personal injury claims, higher than expected costs to resolve personal injury and certain property damage claims, and class action lawsuits alleging damages from Zonolite® Attic Insulation ("ZAI"), a former Grace attic insulation product.
	After a thorough review of these developments, Grace's Board of Directors concluded that a federal court-supervised bankruptcy process provided the best forum available to achieve fairness in resolving these claims and on April 2, 2001 (the "Filing Date"), Grace and 61 of its United States subsidiaries and affiliates filed voluntary petitions for reorganization (the "Filing") under Chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the District of Delaware (the "Bankruptcy Court").
	Under Chapter 11, Grace operated its businesses under court supervision while using the Chapter 11 process to develop and implement a plan for addressing the asbestos-related claims. In September 2008, Grace and other parties filed a joint plan of reorganization with the Bankruptcy Court to address all pending and future asbestos-related claims and all other pre-petition claims as outlined therein (as subsequently amended, the "Joint Plan"). Following the confirmation of the Joint Plan in 2011 by the Bankruptcy Court and in 2012 by a U.S. District Court, and the resolution of all appeals, Grace emerged from bankruptcy on February 3, 2014. (See Note 2 for Chapter 11 information.)
	Basis of Presentation    The interim Consolidated Financial Statements presented herein are unaudited and should be read in conjunction with the Consolidated Financial Statements presented in the Company's 2013 Annual Report on Form 10-K. Such interim Consolidated 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 six-month interim period ended June 30, 2014, are not necessarily indicative of the results of operations for the year ending December 31, 2014.
	Use of Estimates    The preparation of financial statements in conformity with U.S. generally accepted accounting principles (U.S. 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. Grace'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, such as asbestos-related matters and litigation (see Note 2), income taxes (see Note 6), and environmental remediation (see Note 9);
	•	Pension and postretirement liabilities that depend on assumptions regarding participant life spans, future inflation, discount rates and total returns on invested funds (see Note 7); and
	•	Realization values of net deferred tax assets, which depend on projections of future taxable income (see Note 6).
	Currency Translation    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. As a result of this currency devaluation, Grace incurred a charge to net income of $8.5 million in the 2013 first quarter. Of this amount, $1.6 million was included in segment operating income.
	Licensing Revenue Recognition    Grace typically bundles the license, the basic process design package, training, and software into one fixed price contract. The fixed price contract revenue is recognized on a straight-line basis over the period of performance of the contract, except for contingent revenue associated with a final performance guarantee. Revenue associated with the performance guarantee is considered contingent and therefore revenue is recognized when customer acceptance is obtained. Other services that are sold in connection with license arrangements generally qualify for separate accounting, with revenue recognized as earned.
	Reclassifications and Revisions    Certain amounts in prior years' Consolidated Financial Statements have been reclassified to conform to the current year presentation. Such reclassifications have not materially affected previously reported amounts in the Consolidated Financial Statements.
	Certain pension costs previously reported as a separate line item in the Consolidated Statements of Operations are now reported in "cost of goods sold" and in "selling, general and administrative expenses" based upon the functions of the employees to which the pension costs relate. Grace has revised its accounting such that a portion of the defined benefit pension expense has been and will continue to be capitalized into inventories prior to being reported in "cost of goods sold." Grace believes that the change in classification of defined benefit pension costs and the change to inventory capitalization are not material to all prior periods.
	Certain prior period amounts related to borrowings and repayments under credit arrangements reported as financing activities on the Consolidated Statements of Cash Flows have been revised. These amounts were originally presented on a net basis and are now being presented on a gross basis. Grace concluded that these revisions were not material to the prior-year Consolidated Financial Statements.
	Change in Accounting Principle Regarding Pension Benefits    During 2013, Grace changed its method of accounting for actuarial gains and losses relating to its global defined benefit pension plans to a more preferable method under U.S. GAAP. Grace's new method of accounting is referred to as "mark-to-market accounting" and includes immediate recognition of actuarial gains and losses in the period in which they occur. Under Grace's previous accounting method, such amounts were deferred and amortized. In addition, Grace will no longer update the balance sheet funded status of its pension plans each quarter for changes in discount rates and actual returns on assets, but rather will perform such update annually as of the end of each year. Should a significant event occur, Grace's pension obligation and plan assets would be remeasured at an interim period, and the gains or losses on remeasurement would be recognized in that period. This new accounting method was adopted in the 2013 fourth quarter, and retrospectively applied to Grace's financial results for all periods presented.
	Under mark-to-market accounting, Grace's pension costs consist of two elements: 1) ongoing costs recognized quarterly, which include service and interest costs, expected returns on plan assets, and amortization of prior service costs/credits; and 2) mark-to-market gains and losses recognized annually in the fourth quarter resulting from changes in actuarial assumptions, such as discount rates and the difference between actual and expected returns on plan assets.
	In order to better reflect the nature of pension costs in Grace's operating results, Grace also retrospectively revised the classification of defined benefit pension expense. See "Reclassifications and Revisions" above for further discussion related to these revisions.
	These changes have been reported through retrospective application of the new policies to all periods presented. The impacts of all adjustments made to the financial statements are summarized below:
	Consolidated Statements of Operations
		Three months ended June 30, 2013
	(In millions, except per share amounts)	Previously Reported			Revised			Effect of Change
	Cost of goods sold	$	499.5		$	501.9		$	2.4
	Gross profit	303.3			300.9			(2.4		)
	Selling, general and administrative expenses	137.6			142.1			4.5
	Defined benefit pension expense	18.1			—			(18.1		)
	Total costs and expenses	181.2			167.6			(13.6		)
	Income before income taxes	122.1			133.3			11.2
	Provision for income taxes	(38.8		)	(42.5		)	(3.7		)
	Net income	83.3			90.8			7.5
	Net income attributable to W. R. Grace & Co. shareholders	82.8			90.3			7.5
	Basic earnings per share
	Net income attributable to W. R. Grace & Co. shareholders	1.09			1.18			0.09
	Diluted earnings per share
	Net income attributable to W. R. Grace & Co. shareholders	1.07			1.16			0.09
		Six months ended June 30, 2013
	(In millions, except per share amounts)	Previously Reported			Revised			Effect of Change
	Cost of goods sold	$	945.6		$	952.8		$	7.2
	Gross profit	567.1			559.9			(7.2		)
	Selling, general and administrative expenses	266.5			275.4			8.9
	Defined benefit pension expense	36.7			—			(36.7		)
	Total costs and expenses	363.7			335.9			(27.8		)
	Income before income taxes	203.4			224			20.6
	Provision for income taxes	(66.9		)	(73.8		)	(6.9		)
	Net income	136.5			150.2			13.7
	Net income attributable to W. R. Grace & Co. shareholders	135.7			149.4			13.7
	Basic earnings per share
	Net income attributable to W. R. Grace & Co. shareholders	1.79			1.97			0.18
	Diluted earnings per share
	Net income attributable to W. R. Grace & Co. shareholders	1.75			1.93			0.18
	Consolidated Statements of Cash Flows
		Six months ended June 30, 2013
	(In millions)	Previously Reported			Revised			Effect of Change
	Cash flows from operating activities:
	Net income	$	136.5		$	150.2		$	13.7
	Provision for income taxes	66.9			73.8			6.9
	Defined benefit pension expense	36.7			16.1			(20.6		)
	Inventories	(39.5		)	(37.0		)	2.5
	All other items, net(1)	(47.7		)	(50.2		)	(2.5		)
	_______________________________________________________________________________
-1	Includes only those items which relate to the change in accounting method to mark-to-market accounting.
Consolidated Statements of Equity
	30-Jun-13
(In millions)	Previously Reported			Revised			Effect of Change
Retained earnings (Accumulated Deficit)
Beginning balance	$	395.2		$	(240.3	)	$	(635.5	)
Net income	135.7			149.4			13.7
Ending balance	530.9			(90.9		)	(621.8		)
Accumulated other comprehensive income (loss)
Beginning balance	$	(607.3	)	$	29.7		$	637
Other comprehensive income (loss)	45.8			(20.5		)	(66.3		)
Ending balance	(561.5		)	9.2			570.7
Total equity	$	534.1		$	483		$	(51.1	)
Consolidated Statements of Comprehensive Income
	Three months ended June 30, 2013
	Previously Reported			Revised			Effect of Change
Net income	$	83.3		$	90.8		$	7.5
Defined benefit pension and other postretirement plans, net of income taxes	33.3			3.1			(30.2		)
Currency translation adjustments	(16.8		)	(16.9		)	(0.1		)
Total other comprehensive income (loss)	15.3			(15.0		)	(30.3		)
Comprehensive income	98.6			75.8			(22.8		)
Comprehensive income attributable to W. R. Grace & Co. shareholders	98.5			75.7			(22.8		)
	Six months ended June 30, 2013
	Previously Reported			Revised			Effect of Change
Net income	$	136.5		$	150.2		$	13.7
Defined benefit pension and other postretirement plans, net of income taxes	69.5			3.2			(66.3		)
Currency translation adjustments	(23.3		)	(23.3		)	—
Total other comprehensive income (loss)	45.6			(20.7		)	(66.3		)
Comprehensive income	182.1			129.5			(52.6		)
Comprehensive income attributable to W. R. Grace & Co. shareholders	181.5			128.9			(52.6		)
Effect of New Accounting Standards    In July 2013, the FASB issued ASU 2013-11 "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists." This update is intended to improve the consistency surrounding the presentation of an unrecognized tax benefit when a net operating loss carryforward exists, requiring the unrecognized tax benefit to be presented as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The new requirements are effective for fiscal years beginning after December 15, 2013, and for interim periods within those fiscal years, with early adoption permitted. Grace adopted this standard for the 2014 first quarter, and it did not have a material effect on the Consolidated Financial Statements.
In May 2014, the FASB issued ASU 2014-09 "Revenue from Contracts with Customers." This update is intended to remove inconsistencies and weaknesses in revenue requirements; provide a more robust framework for addressing revenue issues; improve comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets; provide more useful information to users of financial statements through improved disclosure requirements; and simplify the preparation of financial statements by reducing the number of requirements to which an entity must refer. The new requirements are effective for fiscal years beginning after December 15, 2016, and for interim periods within those fiscal years, with early adoption not permitted. Grace will adopt this standard when it becomes applicable and is currently evaluating its effect on the Consolidated Financial Statements.

Chapter_11_Information

Chapter 11 Information	6 Months Ended
	Jun. 30, 2014
Reorganizations [Abstract]	'
Chapter 11 Information	'
	Chapter 11 and Joint Plan of Reorganization
	On April 2, 2001, Grace and 61 of its United States subsidiaries and affiliates filed voluntary petitions for reorganization under Chapter 11 of the Bankruptcy Code. The cases were consolidated under case number 01-01139 (the "Chapter 11 Cases"). Grace's non-U.S. subsidiaries and certain of its U.S. subsidiaries were not included in the filing.
	In September 2008, Grace and other parties filed the Joint Plan with the Bankruptcy Court to address all pending and future asbestos-related claims and all other pre-petition claims as outlined therein. On January 31, 2011, the Bankruptcy Court issued an order (the "Confirmation Order") confirming the Joint Plan. On January 31, 2012, the United States District Court for the District of Delaware (the "District Court") issued an order affirming the Confirmation Order and confirming the Joint Plan in its entirety. On February 3, 2014 (the "Effective Date"), the U.S. Court of Appeals for the Third Circuit (the "Third Circuit") dismissed the sole remaining appeal challenging the Confirmation Order and the Joint Plan became effective.
	Under the Joint Plan, two asbestos trusts were established and funded under Section 524(g) of the Bankruptcy Code. The Confirmation Order contains a channeling injunction which provides that all pending and future asbestos-related personal injury claims and demands ("PI Claims") have been channeled for resolution to an asbestos personal injury trust (the "PI Trust") and all pending and future asbestos-related property damage claims and demands ("PD Claims"), including PD Claims related to Grace’s former attic insulation product ("ZAI PD Claims"), have been channeled to a separate asbestos property damage trust (the "PD Trust"). Canadian ZAI PD Claims have been channeled to a separate Canadian claims fund. The trusts are the sole recourse for holders of asbestos-related claims; the channeling injunctions prohibit holders of asbestos-related claims from asserting such claims directly against Grace.
	Under the terms of the Joint Plan, claims under the Chapter 11 Cases were satisfied as follows:
	Asbestos-Related Personal Injury Claims    Asbestos personal injury claimants allege adverse health effects from exposure to asbestos-containing products formerly manufactured by Grace.
	As of the Filing Date, 129,191 PI Claims were pending against Grace. Grace believes that a substantial number of additional PI Claims would have been received between the Filing Date and the Effective Date had such PI Claims not been stayed by the Bankruptcy Court.
	Under the Joint Plan, all PI Claims were channeled to the PI Trust for resolution. The PI Trust will use specified trust distribution procedures to satisfy allowed PI Claims.
	On the Effective Date, the PI Trust was funded with:
	•	$557.7 million in cash from Grace (includes $464.1 million of cash from Grace and $93.6 million of cash from insurance proceeds that were held in escrow);
	•	A warrant to acquire 10 million shares of Company common stock at an exercise price of $17.00 per share, expiring one year after the Effective Date (the "PI Warrant") (this obligation is expected to be settled in cash with the PI Trust as discussed below);
	•	Rights to all proceeds under all of Grace's insurance policies that are available for payment of PI Claims;
	•	$42.1 million in cash from a subsidiary of Fresenius AG, pursuant to the terms of a settlement agreement resolving asbestos-related, successor liability and fraudulent transfer claims against Fresenius; and
	•	$856.8 million in cash and 18 million shares of Sealed Air Corporation common stock paid by Cryovac, Inc., a wholly owned subsidiary of Sealed Air, pursuant to the terms of a settlement agreement resolving asbestos-related, successor liability and fraudulent transfer claims against Cryovac and Sealed Air.
	Grace is obligated to make deferred payments to the PI Trust of $110 million per year for 5 years beginning in 2019, and $100 million per year for 10 years beginning in 2024, which obligation is secured by the Company's obligation to issue 77,372,257 shares of Company common stock to the asbestos trusts in the event of default, subject to customary anti-dilution provisions. As described in Note 16, Grace has entered into an agreement to settle the deferred payment obligations to the PI Trust in exchange for a cash payment.
	The amounts that Grace will be obligated to pay to the PI Trust under the Joint Plan are fixed amounts. Grace is not obligated to make additional payments to the PI Trust beyond the payments described above.
	Asbestos-Related Property Damage Claims    The plaintiffs in asbestos property damage lawsuits generally seek to have the defendants pay for the cost of removing, containing or repairing the asbestos-containing materials in commercial and public buildings. Various factors can affect the merit and value of PD Claims, including legal defenses, product identification, the amount and type of product involved, the age, type, size and use of the building, the legal status of the claimant, the jurisdictional history of prior cases, the court in which the case is pending, and the difficulty of asbestos abatement, if necessary.
	Several class action lawsuits also were filed on behalf of homeowners alleging damage from ZAI. Based on Grace's investigation of the claims described in these lawsuits, and testing and analysis of this product by Grace and others, Grace believes that ZAI was and continues to be safe for its intended purpose and poses little or no threat to human health. The plaintiffs in the ZAI lawsuits dispute Grace's position on the safety of ZAI. In December 2006 the Bankruptcy Court issued an opinion and order holding that, although ZAI is contaminated with asbestos and can release asbestos fibers when disturbed, there is no unreasonable risk of harm from ZAI.
	At Grace's request, in July 2008, the Bankruptcy Court established a claims bar date for U.S. ZAI PD Claims and approved a related notice program that required any person with a U.S. ZAI PD Claim to submit an individual proof of claim no later than October 31, 2008. Approximately 17,960 U.S. ZAI PD Claims were filed prior to the October 31, 2008, claims bar date and, as of the Effective Date, an additional 1,310 U.S. ZAI PD Claims were filed.
	Under the Joint Plan, all PD Claims have been channeled to the PD Trust for resolution. The PD Trust contains two accounts, the PD Account and the ZAI PD Account. U.S. ZAI PD Claims are to be paid from the ZAI PD Account and non-ZAI PD Claims are to be paid from the PD Account. Canadian ZAI PD Claims are to be paid by a separate fund established in Canada. Each account has a separate trustee and the assets of the accounts may not be commingled.
	PD Account
	On the Effective Date, the PD Account of the PD Trust was funded with $39.9 million in cash from Grace and $111.4 million in cash from Cryovac and Fresenius to pay allowed non-ZAI PD Claims settled as of the Effective Date, and CDN$8.6 million in cash from Grace to fund the Canadian ZAI PD Claims fund.
	Following the Effective Date, unresolved non-ZAI PD Claims are to be litigated in the Bankruptcy Court and any future non-ZAI PD Claims are to be litigated in a federal district court, in each case pursuant to procedures to be approved by the Bankruptcy Court. To the extent any such PD Claims are determined to be allowed claims, they are to be paid in cash by the PD Trust. Grace is obligated to make a payment to the PD Trust every six months in the amount of any non-ZAI PD Claims allowed during the preceding six months plus interest (if applicable) and, except for the first six months, the amount of PD Trust expenses for the preceding six months (the "PD Obligation"). The aggregate amount to be paid under the PD Obligation is not capped and Grace may be obligated to make additional payments to the PD Account in respect of the PD Obligation. Grace has accrued for those unresolved non-ZAI PD Claims that it believes are probable and estimable. Grace has not accrued for other unresolved or unasserted non-ZAI PD Claims, as it does not believe that payment on any such claims is probable. As of June 30, 2014, Grace paid $0.4 million to the PD Trust since the Effective Date to fund the payment of two non-ZAI PD Claims that were filed in the Chapter 11 Cases but not resolved until after the Effective Date.
	On the Effective Date, the PD Trust contributed CDN$8.6 million to a separate Canadian ZAI PD Claims fund through which Canadian ZAI PD Claims are to be resolved. Grace has no continuing or contingent obligations to make additional payments into this fund.
	ZAI PD Account
	On the Effective Date, the ZAI PD Account was funded with $34.4 million in cash from Cryovac and Fresenius.
	Grace is obligated to make a payment of $30 million in cash to the ZAI PD Account on the third anniversary of the Effective Date, and Grace is obligated to make up to 10 contingent deferred payments of $8 million per year to the ZAI PD Account during the 20-year period beginning on the fifth anniversary of the Effective Date, with each such payment due only if the assets of the ZAI PD Account fall below $10 million during the preceding year. The amounts that Grace will be obligated to pay to the ZAI PD Account under the Joint Plan are capped amounts. Grace is not obligated to make additional payments to the PD Trust in respect of the ZAI PD Account beyond the payments described above. Grace has accrued for the $30 million payment due on the third anniversary of the Effective Date, but has not accrued for the 10 additional payments since Grace does not currently believe they are probable.
	The PD Trust is to resolve U.S. ZAI PD Claims that qualify for payment under specified trust distribution procedures by paying 55% of the claimed amount, but in no event is the PD Trust to pay more per claim than $4,125 (as adjusted for inflation each year after the fifth anniversary of the Effective Date).
	All payments to the PD Trust required after the Effective Date are secured by the Company's obligation to issue 77,372,257 shares of Company common stock to the asbestos trusts in the event of default, subject to customary anti-dilution provisions. Grace has the right to conduct annual audits of the books, records and claim processing procedures of the PD Trust.
	Asbestos-Related Liability    The recorded asbestos-related liability as of December 31, 2013, was $2,092.4 million, and was included in "liabilities subject to compromise" in the accompanying Consolidated Balance Sheets. The asbestos-related liability was settled at the recorded amount on the Effective Date, including payment of cash of $499.5 million at the Effective Date, issuance of deferred payment obligations of $594.5 million and the warrant of $490.0 million, and transfer of all cash and rights with respect to Grace's insurance policies that provide coverage for asbestos-related claims.
	The PI Trust deferred payment obligation of $110 million per year for 5 years beginning January 2, 2019, and of $100 million per year for 10 years beginning January 2, 2024, was recorded at fair value of $567 million on the Effective Date. The value of the deferred payment obligation was estimated based on (i) interest rates; (ii) the Company's credit standing and the payment period of the deferred payments; (iii) restrictive covenants and terms of the Company's other credit facilities; (iv) assessment of the risk of a default, which if default were to occur would require Grace to issue shares of Company common stock; and (v) the subordination provisions of the deferred payment agreement.
	Grace also recorded a deferred payment obligation of $27.5 million representing the present value of the $30 million payment due to the ZAI PD Account on February 3, 2017.
	The warrant to acquire 10 million shares of the Company's common stock for $17.00 per share was recorded at its estimated value of $490 million on the Effective Date based on the current trading range of Company common stock and other valuation factors.
	PI Warrant Settlement    In October 2012, Grace entered into an agreement with interested parties to settle the PI Warrant in cash during the one-year period after the Effective Date. Under the terms of the settlement agreement, Grace will repurchase the PI Warrant for a price equal to the average of the daily closing prices of Company common stock during the period commencing one day after the Effective Date and ending on the day prior to the date the PI Trust elects to sell the PI Warrant back to Grace, multiplied by 10 million (the number of shares issuable under the PI Warrant), less $170 million (the aggregate exercise price of the PI Warrant), provided that if the average of the daily closing prices is less than $54.50 per share, then the repurchase price would be $375 million, and if the average of the daily closing prices exceeds $66.00 per share, then the repurchase price would be $490 million. The settlement agreement is terminable by the PI Trust in the event a tender offer, or other proposed transaction that would result in a change in control of the Company, is announced during the one-year period after the Effective Date. In such event, the PI Warrant would be settled in shares of Company common stock.
	Other Claims    As provided for in the Joint Plan, Grace paid substantially all other allowed pre-petition claims in full on or within 10 days after the Effective Date. All allowed administrative claims and all allowed priority claims were paid in cash with interest as provided in the Joint Plan. Secured claims were paid in cash with interest or by reinstatement. Allowed general unsecured claims were paid in cash, including post-petition interest in accordance with the Joint Plan. The Joint Plan further provided that Grace, subject to certain non-bankruptcy limitations, satisfy all pension, retirement medical, and similar employee-related obligations and pay workers’ compensation claims.
	Unresolved Claims    The Bankruptcy Court established a claims bar date of March 31, 2003, for claims of general unsecured creditors, PD Claims (other than ZAI PD Claims) and medical monitoring claims related to asbestos. The bar date did not apply to PI Claims or claims related to ZAI PD Claims. Unresolved claims are to be addressed through the claims objection process and the dispute resolution procedures approved by the Bankruptcy Court. Medical monitoring claims have been channeled to the PI Trust.
	Grace believes that its recorded liabilities for unresolved claims represent a reasonable estimate of the ultimate allowable amount for such claims, where sufficient information is available to determine whether liability is probable and estimable. If it is ultimately determined that any amounts are owed on these claims, they are to be paid in full, with interest as required. While the ultimate outcome of these claims cannot be predicted with certainty, Grace believes that the resolution of these matters will not have a material adverse effect on its consolidated financial position, results of operations, or cash flows.
	After the Effective Date, all persons and entities generally are forever barred from asserting against Grace any claims or demands that are based upon any act or omission, transaction, or other activity, event or occurrence that occurred prior to the Effective Date, except as expressly provided in the Joint Plan.
	Effect on Company Common Stock    Under the Joint Plan holders of Company common stock as of the Effective Date retained their shares, but the interests of shareholders are subject to dilution in the event of default with respect to the deferred payment obligations to the PI Trust or the PD Trust under the Company's security obligation. As described in Note 16, Grace has entered into an agreement to settle the deferred payment obligations to the PI Trust in exchange for a cash payment.
	Debt Capital    As of December 31, 2013, all of the Debtors' pre-petition debt was in default due to the Filing. The accompanying December 31, 2013, Consolidated Balance Sheet reflects the classification of the Debtors' pre-petition debt within "liabilities subject to compromise." All debt subject to compromise was paid in full on the Effective Date. See Note 4 for a discussion of Grace's exit financing.
	Accounting Impact    The accompanying Consolidated Financial Statements have been prepared in accordance with ASC 852 "Reorganizations." ASC 852 requires that financial statements of debtors-in-possession be prepared on a going concern basis, which contemplates continuity of operations and realization of assets and liquidation of liabilities in the ordinary course of business.
	Pursuant to ASC 852, Grace's pre-petition and post-petition liabilities that were subject to compromise were required to be reported separately on the balance sheet at an estimate of the amount that would ultimately be allowed by the Bankruptcy Court. As of December 31, 2013, such pre-petition liabilities included fixed obligations (such as debt and contractual commitments), as well as estimates of costs related to contingent liabilities (such as asbestos-related litigation, environmental remediation and other claims). Obligations of Grace subsidiaries not covered by the Filing were required to be classified on the Consolidated Balance Sheets based upon maturity dates or the expected dates of payment. ASC 852 also requires separate reporting of certain expenses, realized gains and losses, and provisions for losses related to the Filing as reorganization items. Grace presents reorganization items as "Chapter 11 expenses, net of interest income," a separate caption in its Consolidated Statements of Operations.
	Grace's December 31, 2013, Consolidated Balance Sheet separately identifies the liabilities that were "subject to compromise" as a result of the Chapter 11 proceedings. In Grace's case, "liabilities subject to compromise" represented both pre-petition and post-petition liabilities as determined under U.S. GAAP. Changes to pre-petition liabilities subsequent to the Filing Date reflect: (1) cash payments under approved court orders; (2) the terms of the Joint Plan, as discussed above, including the accrual of interest on pre-petition debt and other fixed obligations; (3) accruals for employee-related programs; and (4) changes in estimates related to other pre-petition contingent liabilities.
	The table below sets forth the components of liabilities subject to compromise as of December 31, 2013:
	(In millions)	December 31,
		2013
	Asbestos-related contingencies	$	2,092.40
	Pre-petition bank debt plus accrued interest	1,100.00
	Environmental contingencies	134.5
	Unfunded special pension arrangements	129.4
	Income tax contingencies	76.6
	Postretirement benefits other than pension	57.2
	Drawn letters of credit plus accrued interest	37.8
	Accounts payable	34.3
	Retained obligations of divested businesses	29.9
	Other accrued liabilities	94.3
	Reclassification to current liabilities(1)	(10.3		)
	Total Liabilities Subject to Compromise	$	3,776.10
	_______________________________________________________________________________
	-1	As of December 31, 2013, $10.3 million of certain pension and postretirement benefit obligations subject to compromise have been presented in "other current liabilities" in the accompanying Consolidated Balance Sheets in accordance with ASC 715 "Compensation—Retirement Benefits."
	The unfunded special pension arrangements reflected above exclude non-U.S. pension plans and qualified U.S. pension plans that became underfunded subsequent to the Filing.
	Upon emergence from bankruptcy, Grace paid $1,340.6 million to settle certain liabilities subject to compromise. All other balances previously classified as liabilities subject to compromise have been reclassified as either current or long term liabilities based on maturity dates or expected dates of payment.
	Chapter 11 Expenses
	Three Months Ended June 30,						Six Months Ended June 30,
(In millions)	2014			2013			2014			2013
Legal and financial advisory fees	$	3		$	3.8		$	9.2		$	8.8
Interest income	—			(0.5		)	(0.1		)	(0.7		)
Chapter 11 expenses, net of interest income	$	3		$	3.3		$	9.1		$	8.1
Pursuant to ASC 852, interest income earned on the Debtors' cash balances while in bankruptcy was offset against Chapter 11 expenses.
Condensed Financial Information of the Debtors
W. R. Grace & Co.—Chapter 11 Filing Entities
Debtor-in-Possession Statement of Operations
(In millions) (Unaudited)	Six Months Ended
	June 30,
	2013
Net sales, including intercompany	$	720.3
Cost of goods sold, including intercompany, exclusive of depreciation and amortization shown separately below	444.1
Selling, general and administrative expenses	121
Depreciation and amortization	34.6
Chapter 11 expenses, net of interest income	8.1
Research and development expenses	18.8
Interest expense and related financing costs	18.6
Other income, net	(31.5		)
	613.7
Income before income taxes and equity in net income of non-filing entities	106.6
Provision for income taxes	(45.3		)
Income before equity in net income of non-filing entities	61.3
Equity in net income of non-filing entities	88.1
Net income attributable to W. R. Grace & Co. shareholders	$	149.4
W. R. Grace & Co.—Chapter 11 Filing Entities
Debtor-in-Possession Statement of Cash Flows
(In millions) (Unaudited)	Six Months Ended
	June 30,
	2013
Operating Activities
Net income attributable to W. R. Grace & Co. shareholders	$	149.4
Reconciliation to net cash provided by operating activities:
Depreciation and amortization	34.6
Equity in net income of non-filing entities	(88.1		)
Provision for income taxes	45.3
Income taxes paid, net of refunds	(3.4		)
Defined benefit pension expense	7.4
Payments under defined benefit pension arrangements	(52.8		)
Changes in assets and liabilities, excluding the effect of foreign currency translation:
Trade accounts receivable	(10.3		)
Inventories	(29.8		)
Accounts payable	16.8
All other items, net	14.4
Net cash provided by operating activities	83.5
Investing Activities
Capital expenditures	(39.9		)
Transfer to short-term investments	(500.0		)
Transfer to restricted cash and cash equivalents	5.1
Net cash used for investing activities	(534.8		)
Financing Activities
Borrowings under credit arrangements	—
Repayments under credit arrangements	(0.4		)
Proceeds from exercise of stock options	25.2
Net cash provided by financing activities	24.8
Net decrease in cash and cash equivalents	(426.5		)
Cash and cash equivalents, beginning of period	1,064.20
Cash and cash equivalents, end of period	$	637.7
W. R. Grace & Co.—Chapter 11 Filing Entities
Debtor-in-Possession Balance Sheet
(In millions) (Unaudited)	31-Dec-13
ASSETS
Current Assets
Cash and cash equivalents	$	585.1
Restricted cash and cash equivalents	340.5
Trade accounts receivable, net	149.7
Receivables from non-filing entities, net	173
Inventories	138.9
Other current assets	69.3
Total Current Assets	1,456.50
Properties and equipment, net	484.5
Goodwill	279.9
Technology and other intangible assets, net	249.1
Deferred income taxes	817.3
Asbestos-related insurance	500
Loans receivable from non-filing entities, net	283.8
Investment in non-filing entities	531.3
Investment in unconsolidated affiliate	96.2
Other assets	16.5
Total Assets	$	4,715.10
LIABILITIES AND EQUITY
Liabilities Not Subject to Compromise
Current liabilities	$	247.4
Underfunded defined benefit pension plans	52.2
Other liabilities	78.7
Total Liabilities Not Subject to Compromise	378.3
Liabilities Subject to Compromise	3,776.10
Total Liabilities	4,154.40
Total W. R. Grace & Co. Shareholders' Equity	560.6
Noncontrolling interests in Chapter 11 filing entities	0.1
Total Equity	560.7
Total Liabilities and Equity	$	4,715.10
This summary of the terms of various agreements does not purport to be complete and is qualified in its entirety by reference to the Joint Plan, the Confirmation Order, the Asbestos Trust Agreements, the Asbestos Insurance Transfer Agreement, the Deferred Payment Agreements, the Guarantee Agreements, the Share Issuance Agreement, the Warrant Agreement, the Warrant Implementation Letter, and the Warrant Registration Rights Agreement, which have been filed with the SEC.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories	'
	Inventories are stated at the lower of cost or market, and cost is determined using FIFO. Inventories consisted of the following at June 30, 2014, and December 31, 2013:
	(In millions)	June 30,		December 31,
		2014		2013
	Raw materials	$	90.6	$	69.7
	In process	48.9		41.8
	Finished products	162.7		152.4
	Other	32.4		31.4
		$	334.6	$	295.3

Debt

Debt	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Debt	'
	Components of Debt
	(In millions)	June 30,			December 31,
		2014			2013
	U.S. dollar term loan, net of unamortized discount of $2.2 at June 30, 2014	$	696		$	—
	Euro term loan, net of unamortized discount of $0.5 at June 30, 2014	203.2			—
	Revolving credit facility	50			—
	Debt payable—unconsolidated affiliate	30.1			28.8
	Other borrowings	94.1			81.9
	Total debt	1,073.40			110.7
	Less debt payable within one year	157.4			81.1
	Debt payable after one year	$	916		$	29.6
	Debt Subject to Compromise
	Bank borrowings	$	—		$	500
	Accrued interest on bank borrowings	—			471
	Default interest settlement	—			129
	Drawn letters of credit	—			26.7
	Accrued interest on drawn letters of credit	—			11.1
		$	—		$	1,137.80
	Weighted average interest rates on total debt	3.3		%	3.6		%
	At June 30, 2014, the fair value of Grace's debt payable approximated the recorded value of $1,073.4 million. Fair value is determined based on Level 2 inputs, including expected future cash flows (discounted at market interest rates), quotes from financial institutions and other appropriate valuation methodologies. Grace's debt subject to compromise was paid in full on the Effective Date.
	On the Effective Date, Grace entered into a Credit Agreement (the "Credit Agreement") in connection with its exit financing. The Credit Agreement provides for:
	(a)	a $700 million term loan due in 2021, with interest at LIBOR +225 bps with a 75 bps floor;
	(b)	a €150 million term loan due in 2021, with interest at EURIBOR +250 bps with a 75 bps floor;
	(c)	a $400 million revolving credit facility due in 2019, with interest at LIBOR +175 bps; and
	(d)	a $250 million delayed draw term loan facility available for 12 months, with amounts drawn due in 2021, with interest at LIBOR +225 bps with a 75 bps floor.
	The term loans will amortize in equal monthly installments in aggregate annual amounts equal to 1.00% of the original principal amount thereof.
	The Credit Agreement contains customary negative and affirmative covenants and events of default. To secure its obligations under the Credit Agreement, the Company has granted security interests in the shares of its Grace-Conn. and Alltech Associates subsidiaries, substantially all of its U.S. non-real estate assets and property, and certain U.S. real estate.
	This summary of the Credit Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of such agreement, a copy of which has been filed with the SEC.

Fair_Value_Measurements_and_Ri

Fair Value Measurements and Risk	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements and Risk	'
	Fair Value Measurements and Risk
	Certain of Grace's assets and liabilities are reported at fair value on a gross basis. ASC 820 "Fair Value Measurements and Disclosures" defines fair value as the value that would be received at the measurement date in the principal or "most advantageous" market. Grace uses principal market data, whenever available, to value assets and liabilities that are required to be reported at fair value.
	Grace has identified the following financial assets and liabilities that are subject to the fair value analysis required by ASC 820:
	Fair Value of Debt and Other Financial Instruments
	See Note 4 for a discussion of the fair value of Grace's debt. At June 30, 2014, the recorded values of other financial instruments such as cash equivalents and trade receivables and payables approximated their fair values, based on the short-term maturities and floating rate characteristics of these instruments.
	Derivatives
	From time to time, Grace enters into commodity derivatives such as fixed-rate swaps or options with financial institutions to mitigate the risk of volatility of prices of natural gas or other commodities. Under fixed-rate swaps, Grace locks in a fixed rate with a financial institution for future purchases, purchases its commodity from a supplier at the prevailing market rate, and then settles with the bank for any difference in the rates, thereby "swapping" a variable rate for a fixed rate.
	The valuation of Grace's fixed-rate natural gas swaps was determined using a market approach, based on natural gas futures trading prices quoted on the New York Mercantile Exchange. Commodity fixed-rate swaps with maturities of not more than 12 months are used and designated as cash flow hedges of forecasted purchases of natural gas. The effective portion of the gain or loss on the commodity contracts is recorded in "accumulated other comprehensive income" and reclassified into income in the same period or periods that the underlying commodity purchase affects income. At June 30, 2014, there are no current open swap contracts.
	The valuation of Grace's natural gas call options was determined using a market approach, based on the strike price of the options and the natural gas futures trading prices quoted on the New York Mercantile Exchange. Commodity option contracts with maturities of not more than 24 months are used and designated as cash flow hedges of forecasted purchases of natural gas. Current open option contracts hedge forecasted transactions until June 2015. The effective portion of the gain or loss on the commodity contracts is recorded in "accumulated other comprehensive income" and reclassified into income in the same period or periods that the underlying purchases affect income. At June 30, 2014, the contract volume, or notional amount, of the commodity option contracts was 4.5 million MMBtu and the natural gas futures trading price of option contracts was less than the strike price.
	The valuation of Grace's fixed-rate aluminum swaps was determined using a market approach, based on aluminum futures trading prices quoted on the London Metal Exchange. Commodity fixed-rate swaps with maturities of not more than 12 months are used and designated as cash flow hedges of forecasted purchases of aluminum. Current open contracts hedge forecasted transactions until June 2015. The effective portion of the gain or loss on the commodity contracts is recorded in "accumulated other comprehensive income" and reclassified into income in the same period or periods that the underlying commodity purchase affects income. At June 30, 2014, the contract volume, or notional amount, of the commodity contracts was 1.5 million pounds with a total contract value of $1.2 million.
	Because Grace does business in over 40 countries and in more than 50 currencies, results are exposed to fluctuations in currency exchange rates. Grace seeks to minimize exposure to these fluctuations by matching sales in volatile currencies with expenditures in the same currencies, but it is not always possible to do so. From time to time Grace will use financial instruments such as currency forward contracts, options, or combinations of the two to reduce the risk of certain specific transactions. However, Grace does not have a policy of hedging all exposures, because management does not believe that such a level of hedging would be cost-effective.
	The valuation of Grace's currency exchange rate forward contracts is determined using both a market approach and an income approach. Inputs used to value currency exchange rate forward contracts consist of: (1) spot rates, which are quoted by various financial institutions; (2) forward points, which are primarily affected by changes in interest rates; and (3) discount rates used to present value future cash flows, which are based on the London Interbank Offered Rate (LIBOR) curve or overnight indexed swap rates.
	In November 2007, Grace purchased currency forward contracts to mitigate the effect of currency risk with respect to intercompany loans between its principal U.S. subsidiary and a German subsidiary. These derivatives were not designated as hedging instruments under ASC 815 "Derivatives and Hedging." These contracts were settled upon Grace's emergence from bankruptcy during the 2014 first quarter.
	Grace uses interest rate swaps designated as cash flow hedges to manage fluctuations in interest rates on variable rate debt. The effective portion of gains and losses on these interest rate cash flow hedges is recorded in "accumulated other comprehensive income" and reclassified into "interest expense and related financing costs" during the period in which the underlying interest payments occur.
	In connection with its emergence financing, Grace entered into an interest rate swap beginning on February 3, 2015, and maturing on February 3, 2020, fixing the interest on $250 million of Grace's term debt at a rate of 4.643%. The valuation of this interest rate swap is determined using both a market approach and an income approach, using prevailing market interest rates and discount rates to present value future cash flows based on the forward LIBOR yield curves.
	The following tables present the fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2014, and December 31, 2013:
		Fair Value Measurements at June 30, 2014, Using
	(In millions)	Total				Quoted Prices in Active Markets for Identical Assets or Liabilities				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets
	Currency derivatives	$	2.2			$	—			$	2.2	$	—
	Commodity derivatives	0.1				—				0.1		—
	Total Assets	$	2.3			$	—			$	2.3	$	—
	Liabilities
	Currency derivatives	$	0.2			$	—			$	0.2	$	—
	Interest rate derivatives	2.8				—				2.8		—
	Total Liabilities	$	3			$	—			$	3	$	—
		Fair Value Measurements at December 31, 2013, Using
	(In millions)	Total				Quoted Prices in Active Markets for Identical Assets or Liabilities				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets
	Currency derivatives	$	2.1			$	—			$	2.1	$	—
	Total Assets	$	2.1			$	—			$	2.1	$	—
	Liabilities
	Currency derivatives	$	6.9			$	—			$	6.9	$	—
	Commodity derivatives	0.1				—				0.1		—
	Total Liabilities	$	7			$	—			$	7	$	—
	The following tables present the location and fair values of derivative instruments included in the Consolidated Balance Sheets as of June 30, 2014, and December 31, 2013:
	30-Jun-14	Asset Derivatives						Liability Derivatives
	(In millions)	Balance Sheet		Fair Value				Balance Sheet		Fair Value
		Location						Location
	Derivatives designated as hedging instruments under ASC 815:
	Commodity contracts	Other current assets		$	0.1			Other current liabilities		$	—
	Currency contracts	Other current assets		1				Other current liabilities		—
	Interest rate contracts	Other current assets		—				Other current liabilities		1
	Currency contracts	Other assets		0.9				Other liabilities		—
	Interest rate contracts	Other assets		—				Other liabilities		1.8
	Derivatives not designated as hedging instruments under ASC 815:
	Currency contracts	Other current assets		0.3				Other current liabilities		0.2
	Currency contracts	Other assets		—				Other liabilities		—
	Total derivatives			$	2.3					$	3
	December 31, 2013	Asset Derivatives						Liability Derivatives
	(In millions)	Balance Sheet		Fair Value				Balance Sheet		Fair Value
		Location						Location
	Derivatives designated as hedging instruments under ASC 815:
	Commodity contracts	Other current assets		$	—			Other current liabilities		$	0.1
	Currency contracts	Other current assets		1				Other current liabilities		—
	Currency contracts	Other assets		1				Other liabilities		—
	Derivatives not designated as hedging instruments under ASC 815:
	Currency contracts	Other current assets		0.1				Other current liabilities		6.9
	Total derivatives			$	2.1					$	7
	The following tables present the location and amount of gains and losses on derivative instruments included in the Consolidated Statements of Operations or, when applicable, gains and losses initially recognized in other comprehensive income ("OCI") for the three and six months ended June 30, 2014 and 2013:
	Three Months Ended June 30, 2014	Amount of Gain or (Loss) Recognized in OCI on Derivatives				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from OCI into Income
(In millions)	(Effective Portion)			(Effective Portion)		(Effective Portion)
Derivatives in ASC 815 cash flow hedging relationships:
Interest rate contracts	$	(3.9	)		Interest expense		$	—
Currency contracts	(0.6		)		Other expense		(0.7		)
Commodity contracts	—				Cost of goods sold		(0.1		)
Total derivatives	$	(4.5	)				$	(0.8	)
					Location of Gain or (Loss) Recognized in Income on Derivatives		Amount of Gain or (Loss) Recognized in Income on Derivatives
Derivatives not designated as hedging instruments under ASC 815:
Currency contracts					Other expense		$	0.3
Six Months Ended June 30, 2014	Amount of Gain or (Loss) Recognized in OCI on Derivatives				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from OCI into Income
(In millions)	(Effective Portion)				(Effective Portion)		(Effective Portion)
Derivatives in ASC 815 cash flow hedging relationships:
Interest rate contracts	$	(2.9	)		Interest expense		$	—
Currency contracts	(0.1		)		Other expense		(0.2		)
Commodity contracts	0.4				Cost of goods sold		0.2
Total derivatives	$	(2.6	)				$	—
					Location of Gain or (Loss) Recognized in Income on Derivatives		Amount of Gain or (Loss) Recognized in Income on Derivatives
Derivatives not designated as hedging instruments under ASC 815:
Currency contracts					Other expense		$	4.8
Three Months Ended June 30, 2013	Amount of Gain or (Loss) Recognized in OCI on Derivatives				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from OCI into Income
(In millions)	(Effective Portion)				(Effective Portion)		(Effective Portion)
Derivatives in ASC 815 cash flow hedging relationships:
Currency contracts	$	1			Other expense		$	1
Currency contracts	—				Cost of goods sold		(0.2		)
Commodity contracts	(1.0		)		Cost of goods sold		0.5
Total derivatives	$	—					$	1.3
					Location of Gain or (Loss) Recognized in Income on Derivatives		Amount of Gain or (Loss) Recognized in Income on Derivatives
Derivatives not designated as hedging instruments under ASC 815:
Currency contracts					Other expense		$	(3.6	)
Six Months Ended June 30, 2013	Amount of Gain or (Loss) Recognized in OCI on Derivatives				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from OCI into Income
(In millions)	(Effective Portion)				(Effective Portion)		(Effective Portion)
Derivatives in ASC 815 cash flow hedging relationships:
Currency contracts	$	0.7			Other expense		$	0.8
Currency contracts	(0.2		)		Cost of goods sold		(0.1		)
Commodity contracts	(0.3		)		Cost of goods sold		0.2
Total derivatives	$	0.2					$	0.9
					Location of Gain or (Loss) Recognized in Income on Derivatives		Amount of Gain or (Loss) Recognized in Income on Derivatives
Derivatives not designated as hedging instruments under ASC 815:
Currency contracts					Other expense		$	4.1
Net Investment Hedges
Grace uses foreign currency denominated debt as nonderivative hedging instruments in certain net investment hedges. The effective portion of gains and losses attributable to these net investment hedges is recorded to "currency translation adjustments" within "accumulated other comprehensive income." Recognition in earnings of amounts previously recorded to "currency translation adjustments" is limited to circumstances such as complete or substantially complete liquidation of the net investment in the hedged foreign operation. During the second quarter, Grace designated the first €130 million of its €150 million term loan as a hedging instrument of its net investment in European subsidiaries.
The following tables present the location and amount of gains and losses on nonderivative instruments designated as net investment hedges. There were no reclassifications of the effective portion of net investment hedges out of OCI and into earnings for the periods presented in the tables below.
Three Months Ended June 30, 2014	Amount of Gain or (Loss) Recognized in OCI in Currency Translation Adjustments				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income
(In millions)	(Effective Portion)				(Ineffective Portion)		(Ineffective Portion)
Nonderivatives in ASC 815 net investment hedging relationships:
Foreign currency denominated debt	$	1.8			Not applicable		$	—
Total nonderivatives	$	1.8					$	—
Six Months Ended June 30, 2014	Amount of Gain or (Loss) Recognized in OCI in Currency Translation Adjustments				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income
(In millions)	(Effective Portion)				(Ineffective Portion)		(Ineffective Portion)
Nonderivatives in ASC 815 net investment hedging relationships:
Foreign currency denominated debt	$	1.8			Not applicable		$	—
Total nonderivatives	$	1.8					$	—
Credit Risk
Grace is exposed to credit risk in its trade accounts receivable. Customers in the petroleum refining and construction industries represent the greatest exposure. Grace's credit evaluation policies, relatively short collection terms and history of minimal credit losses mitigate credit risk exposures. Grace does not generally require collateral for its trade accounts receivable, but may require a bank letter of credit in certain instances, particularly when selling to customers in cash restricted countries.
Grace may also be exposed to credit risk in its derivatives contracts. Grace monitors counterparty credit risk and currently does not anticipate nonperformance by counterparties to its derivatives. Grace's derivative contracts are with internationally recognized commercial financial institutions.

Income_Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	The annualized effective tax rate on 2014 forecasted income is estimated to be 25.3% as of June 30, 2014, compared with 28.5% for the year ended December 31, 2013. The decrease in the rate compared with the prior year primarily relates to higher discrete tax benefits in 2014, including a benefit for the release of prior uncertain tax positions.
	Grace has generally not paid U.S. Federal income taxes in cash in recent years since available tax deductions and credits have fully offset U.S. taxable income. At emergence from bankruptcy, Grace generated approximately $670 million in U.S. Federal net operating losses (NOLs), which were previously recorded as deferred tax assets for temporary differences, that will be available to reduce U.S. Federal taxable income in 2014 and future years. In addition, Grace expects to receive U.S. Federal income tax deductions upon settlement of the warrant held by the PI Trust and upon payment of the deferred payment obligations to the PI Trust and the PD Trust. As described in Note 16, Grace has entered into an agreement to settle the deferred payment obligations to the PI Trust in exchange for a cash payment of $632.0 million. This payment will increase Grace's NOLs when made. A significant portion of this amount has already been recorded as a deferred tax asset for temporary differences. Grace expects to carryforward most of its NOLs. Under U.S. Federal income tax law, a corporation is generally permitted to carryforward NOLs for a 20-year period for deduction against future taxable income.
	The following table summarizes the balance of deferred tax assets, net of deferred tax liabilities, at June 30, 2014, of $821.8 million:
		Deferred Tax Asset		Valuation Allowance			Net Deferred Tax Asset(2)
		(Net of Liabilities)
	United States—Federal(1)	$	729.4	$	(2.1	)	$	727.3
	United States—States(1)	70.6		(10.0		)	60.6
	Germany	26.4		—			26.4
	Other Foreign	7.8		(0.3		)	7.5
	Total	$	834.2	$	(12.4	)	$	821.8
	_______________________________________________________________________________
	-1	The U.S. Federal deductions generated at emergence of $670 million, the $490 million warrant settlement, and the $616 million present value of the deferred payment obligations as of June 30, 2014, account for a significant portion of the U.S. Federal and State deferred tax assets. The aforementioned settlement of the deferred payment obligations will increase Grace's NOLs by $632 million when paid.
	-2	The noncurrent deferred tax asset of $619.9 million reflected in the June 30, 2014, Consolidated Balance Sheet is net of $4.8 million of income tax contingencies related to these deferred tax assets.
	Grace will need to generate approximately $2,080 million of U.S. Federal taxable income by 2034 - 2035 (or approximately $100 million per year during the carryforward period) to fully realize the U.S. Federal and a majority of the U.S. State net deferred tax assets.
	The following table summarizes expiration dates in jurisdictions where we have, or will have, material tax loss carryforwards:
		Expiration Dates
	United States—Federal	2034 - 2035
	United States—States	2014 - 2035
	Brazil	Unlimited Carryforward
	Spain	2029 - 2030
	India	2015 - 2021
	In evaluating Grace's ability to realize its deferred tax assets, Grace 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 extended period of time over which the temporary differences become deductible and the carryforward and/or carryback periods available to Grace for tax reporting purposes in the related jurisdiction. In estimating future taxable income, Grace develops assumptions, including the amount of future federal, state and international pretax operating income that Grace can reasonably expect to generate, the reversal of temporary differences and the implementation of feasible and prudent tax planning strategies. Grace records a valuation allowance to reduce deferred tax assets to the amount that it believes is more likely than not to be realized.
	Based on the status of examinations in taxing jurisdictions and relevant statutes and regulatory guidance, Grace has recognized $59.6 million of benefits associated with prior uncertain tax positions. Grace believes it is reasonably possible that in the next 12 months the amount of the liability for unrecognized tax benefits could decrease by approximately $4 million.

Pension_Plans_and_Other_Postre

Pension Plans and Other Postretirement Benefit Plans	6 Months Ended
	Jun. 30, 2014
Pension and Other Postretirement Benefit Expense [Abstract]	'
Pension Plans and Other Postretirement Benefit Plans	'
	Pension Plans    The following table presents the funded status of Grace's fully-funded, underfunded, and unfunded pension plans:
	(In millions)	June 30,			December 31,
		2014			2013
	Overfunded defined benefit pension plans	$	45.7		$	16.7
	Underfunded defined benefit pension plans	(18.8		)	(66.2		)
	Unfunded defined benefit pension plans(1)	(324.3		)	(233.4		)
	Total underfunded and unfunded defined benefit pension plans	(343.1		)	(299.6		)
	Unfunded defined benefit pension plans included in liabilities subject to compromise(1)	—			(123.6		)
	Pension liabilities included in other current liabilities	(15.7		)	(15.0		)
	Net funded status	$	(313.1	)	$	(421.5	)
	_______________________________________________________________________________
	-1	At emergence, Grace paid approximately $27 million of the unfunded defined benefit pension plan liability included in liabilities subject to compromise and reclassified the remaining balance to unfunded defined benefit pension plans.
	Fully-funded plans include several advance-funded plans where the fair value of the plan assets exceeds the projected benefit obligation ("PBO"). This group of plans was overfunded by $45.7 million as of June 30, 2014, and the overfunded status is reflected as "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. The combined balance of the underfunded and unfunded plans was $358.8 million as of June 30, 2014.
	Postretirement Benefits Other Than Pensions  Grace has provided postretirement health care and life insurance benefits for retired employees of certain U.S. business units and certain divested business units. The postretirement medical plan provides various levels of benefits to employees hired before 1993 who retire from Grace after age 55 with at least 10 years of service. These plans are unfunded and Grace pays a portion of the costs of benefits under these plans as they are incurred. Grace applies ASC 715 to these plans, which requires that the future costs of postretirement health care and life insurance benefits be accrued over the employees' years of service. Actuarial gains and losses are recognized in the Consolidated Balance Sheets as a component of Shareholders’ Equity, with amortization of the net actuarial gains and losses that exceed 10 percent of the accumulated postretirement benefit obligation recognized each quarter in the Consolidated Statements of Operations over the average future service period of active employees.
	In June 2014, Grace announced plans to discontinue its postretirement medical plan for all U.S. employees effective October 31, 2014, and to reduce certain postretirement life insurance benefits. As a result of these actions, Grace recognized a gain of $41.9 million in other comprehensive income in the second quarter. Grace will amortize $39.5 million from accumulated other comprehensive income into the Consolidated Statement of Operations during the five-month period from June to October 2014. The $7.9 million gain recognized in the second quarter is reported as a separate line item in the Consolidated Statement of Operations.
	Components of Net Periodic Benefit Cost (Income)
		Three Months Ended June 30,
		2014									2013
		Pension						Other Post			Pension						Other Post
	(In millions)	U.S.			Non-U.S.			Retirement			U.S.			Non-U.S.			Retirement
	Service cost	$	5.9		$	2.8		$	0.1		$	6.3		$	2.7		$	—
	Interest cost	14.9			5.6			0.3			13.1			5.1			0.6
	Expected return on plan assets	(17.5		)	(3.9		)	—			(17.0		)	(3.5		)	—
	Amortization of prior service cost (credit)	0.2			—			(0.4		)	0.2			—			—
	Amortization of net deferred actuarial (gain) loss	—			—			(0.1		)	—			—			0.1
	Annual mark-to-market adjustment	—			—			—			—			—			—
	Gain on termination of postretirement plans	—			—			(7.9		)	—			—			—
	Net periodic benefit cost (income)	$	3.5		$	4.5		$	(8.0	)	$	2.6		$	4.3		$	0.7
		Six Months Ended June 30,
		2014									2013
		Pension						Other Post			Pension						Other Post
	(In millions)	U.S.			Non-U.S.			Retirement			U.S.			Non-U.S.			Retirement
	Service cost	$	11.8		$	5.5		$	0.1		$	12.6		$	5.4		$	0.1
	Interest cost	30.1			11.3			0.9			26			10.2			1.1
	Expected return on plan assets	(35.0		)	(7.8		)	—			(34.0		)	(7.0		)	—
	Amortization of prior service cost (credit)	0.4			—			(0.5		)	0.4			—			—
	Amortization of net deferred actuarial (gain) loss	—			—			(0.3		)	—			—			0.2
	Annual mark-to-market adjustment	(3.1		)	—			—			—			—			—
	Gain on termination of postretirement plans	—			—			(7.9		)	—			—			—
	Net periodic benefit cost (income)	$	4.2		$	9		$	(7.7	)	$	5		$	8.6		$	1.4
	At emergence, benefit payments of approximately $27 million were paid from a U.S. nonqualified pension plan in connection with Grace’s emergence from bankruptcy. As a result, that plan was remeasured as of March 1, 2014, using a discount rate of 4.43%. The remeasurement resulted in a mark-to-market gain of $3.1 million.
	Plan Contributions and Funding    Grace 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 ("ERISA"). For ERISA purposes, funded status is calculated on a different basis than under U.S. GAAP. In April 2014, Grace made an accelerated contribution to the trusts that hold assets of the U.S. qualified pension plans of approximately $75 million.
	Grace intends to fund non-U.S. pension plans based on applicable legal requirements and actuarial and trustee recommendations.
	Grace plans to pay benefits as they become due under the pay-as-you-go plans and to maintain compliance with federal funding laws for its U.S. qualified pension plans.
	Defined Contribution Retirement Plan    Grace sponsors a defined contribution retirement plan for its employees in the United States. This plan is qualified under section 401(k) of the U.S. tax code. Currently, Grace contributes an amount equal to 100% of employee contributions, up to 6% of an individual employee's salary or wages. Grace's costs related to this benefit plan for the three and six months ended June 30, 2014, were $3.3 million and $6.6 million compared with $3.4 million and $6.7 million for the corresponding prior-year periods.

Other_Balance_Sheet_Accounts

Other Balance Sheet Accounts	6 Months Ended
	Jun. 30, 2014
Other Balance Sheet Accounts	'
Other Balance Sheet Accounts	'
	(In millions)	June 30,		December 31,
		2014		2013
	Other Current Liabilities
	Accrued compensation	$	57.4	$	62.4
	Income tax payable	32.6		32
	Customer volume rebates	32.3		33.3
	Environmental contingencies	21.3		1.3
	Deferred revenue	15.8		14.3
	Pension liabilities	15.7		15
	Deferred tax liability	0.1		0.1
	Other accrued liabilities	145.3		133.6
		$	320.5	$	292
	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. Environmental contingencies and other accrued liabilities in the table above include certain amounts reclassified at emergence from liabilities subject to compromise.

Commitments_and_Contingent_Lia

Commitments and Contingent Liabilities	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingent Liabilities	'
	Commitments and Contingent Liabilities
	Asbestos-Related Liability    See Note 2 for a discussion of Grace's asbestos-related liability and future obligations and contingencies following the effectiveness of the Joint Plan.
	Environmental Remediation    Grace 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. Grace accrues for anticipated costs associated with investigative and remediation efforts where an assessment has indicated that a probable liability has been incurred and the cost can be reasonably estimated. These accruals do not take into account any discounting for the time value of money.
	Grace's environmental liabilities are reassessed whenever circumstances become better defined or remediation efforts and their costs can be better estimated. These liabilities are evaluated based on currently available information, including the progress of remedial investigation 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.
	Estimated Investigation and Remediation Costs
	At June 30, 2014, Grace's estimated liability for environmental investigation and remediation costs (non-asbestos and asbestos-related) totaled $58.6 million, compared with $135.9 million at December 31, 2013. These amounts are based on funding and/or remediation agreements in place and Grace's estimate of costs for sites not subject to a formal remediation plan for which sufficient information is available to estimate investigation and/or remediation costs. These amounts do not include environmental response costs for the Libby vermiculite mine area or certain vermiculite expansion facilities, which may be material but are not currently estimable. Due to these vermiculite-related matters, it is probable that Grace's actual investigation and remediation costs will exceed Grace's current estimates by material amounts. As of June 30, 2014, claim payments of $75.9 million were made in connection with Grace's emergence from Chapter 11. Net cash paid against previously established reserves for the six months ended June 30, 2014 and 2013, were $7.0 million and $6.3 million, respectively.
	Vermiculite-Related Matters
	Grace purchased a vermiculite mine in Libby, Montana, in 1963 and operated it until 1990. Vermiculite concentrate from the Libby mine was used in the manufacture of attic insulation and other products. Some of the vermiculite ore that was mined at the Libby mine contained naturally occurring asbestos. The U.S. Environmental Protection Agency (EPA) has investigated sites, including some owned by Grace, which used, stored or processed vermiculite concentrate from the Libby mine. EPA, Grace and/or other potentially responsible parties have conducted investigations and/or remedial actions at the mine and those sites identified by EPA as requiring remedial action.
	With respect to the Grace-owned Libby vermiculite mine and the surrounding area, EPA and Grace are engaged in a remedial investigation of these areas, and EPA will determine an appropriate cleanup standard.
	During 2010, EPA began reinvestigating certain facilities on a list of 105 facilities where vermiculite concentrate from the Libby mine may have been processed. Grace is cooperating with EPA on this reinvestigation. EPA has requested that Grace perform remediation at eight of these facilities. In 2011, Grace performed preliminary evaluations to estimate the cost of remediating these sites based on revised criteria and recorded an aggregate charge of $16.0 million. It is probable that EPA will request additional remediation at other facilities. Grace does not have sufficient information to identify either the sites that might require additional remediation or the cost of any additional remediation. Grace will continue to monitor EPA's reinvestigation of the remaining sites and assess any information received from EPA. A liability will be recorded in the future should Grace determine that an obligation is probable and reasonably estimable.
	Grace's total estimated liability for asbestos remediation studies and other estimable matters related to its former vermiculite operations in Libby, as well as the cost of remediation at vermiculite processing sites outside of Libby, at June 30, 2014, and December 31, 2013, was $15.8 million and $60.4 million, respectively, excluding interest where applicable. It is probable that Grace's ultimate liability will exceed current estimates by material amounts. Grace's current recorded liability will be adjusted as Grace receives new information and amounts become reasonably estimable.
	Non-Vermiculite-Related Matters
	At June 30, 2014, and December 31, 2013, Grace's estimated liability for remediation of sites not related to its former vermiculite mining and processing activities was $42.8 million and $75.5 million, respectively. This liability relates to Grace's current and former operations, including its share of liability for off-site disposal at facilities where it has been identified as a potentially responsible party. Grace's estimated liability is based upon regulatory requirements and environmental conditions at each site. As Grace receives new information its estimated liability may change materially.
	Purchase Commitments    Grace uses purchase commitments to ensure supply and to minimize the volatility of major components of direct manufacturing costs including natural gas, certain metals, rare earths, asphalt, amines and other materials. Such commitments are for quantities that Grace fully expects to use in its normal operations.
	Guarantees and Indemnification Obligations    Grace 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. Grace generally does not establish a liability for product warranty based on a percentage of sales or other formula. Grace accrues a warranty liability on a transaction-specific basis depending on the individual facts and circumstances related to each sale. Both the liability and annual expense related to product warranties are immaterial to the Consolidated Financial Statements.
	•	Licenses of intellectual property by Grace to third parties in which Grace has agreed to indemnify the licensee against third party infringement claims.
	•	Contracts providing for the sale of a former business unit or product line in which Grace has agreed to indemnify the buyer against liabilities arising prior to the closing of the transaction, including environmental liabilities.
	•	Guarantees of real property lease obligations of third parties, typically arising out of (a) leases entered into by former subsidiaries of Grace, or (b) the assignment or sublease of a lease by Grace to a third party.
	Financial Assurances    Financial assurances have been established for a variety of purposes, including insurance and environmental matters, trade-related commitments and other matters. At June 30, 2014, Grace had gross financial assurances issued and outstanding of $145.8 million, composed of $39.2 million of surety bonds issued by various insurance companies and $106.6 million of standby letters of credit and other financial assurances issued by various banks.
	Accounting for Contingencies    Although the outcome of each of the matters discussed above cannot be predicted with certainty, Grace has assessed its risk and has made accounting estimates as required under U.S. GAAP. Claims related to certain of the items discussed above were addressed as part of Grace's Chapter 11 proceedings. Accruals for such contingencies were included in "liabilities subject to compromise" in the accompanying December 31, 2013, Consolidated Balance Sheet.

Restructuring_Expenses_and_Rel

Restructuring Expenses and Related Asset Impairments	6 Months Ended
	Jun. 30, 2014
Restructuring and Related Activities [Abstract]	'
Restructuring Expenses and Related Asset Impairments	'
	In the second quarter, Grace incurred costs from restructuring actions as a result of changes in its business environment and business structure. Grace incurred $2.0 million ($0.5 million in Construction Products, $0.2 million in Catalysts Technologies, and $1.3 million in Corporate) of restructuring expenses during the second quarter, compared with $4.2 million during the prior-year quarter. These costs are not included in segment operating income. Substantially all costs related to the restructuring programs are expected to be paid by December 31, 2015.
	Also in the second quarter, Grace incurred an asset impairment charge of $9.7 million. The impairment charge related to the repositioning of the ready-mix process control solutions business that is part of the Construction Products operating segment.
	Restructuring Expenses and Asset Impairments	Three Months Ended June 30,					Six Months Ended June 30,
	(In millions)	2014			2013		2014		2013
	Restructuring expenses	$	2		$	4.2	$	2.7	$	5
	Asset impairments	9.7			0.1		9.7		0.1
	Total restructuring expenses and asset impairments	$	11.7		$	4.3	$	12.4	$	5.1
	Restructuring Liability	Total
	(In millions)
	Balance, December 31, 2013	$	4.4
	Accruals for severance and other costs	2.7
	Payments	(3.4		)
	Balance, June 30, 2014	$	3.7

Other_Income_Expense_net

Other (Income) Expense, net	6 Months Ended
	Jun. 30, 2014
Other Income and Expenses [Abstract]	'
Other (Income) Expense, net	'
	Components of other expense, net are as follows:
		Three Months Ended June 30,						Six Months Ended June 30,
	(In millions)	2014			2013			2014			2013
	Restructuring expenses and asset impairments	$	11.7		$	4.3		$	12.4		$	5.1
	Provision for environmental remediation	3.4			1.3			4.6			2.3
	Asbestos and bankruptcy-related charges, net	(2.4		)	—			6.4			—
	Interest income	(0.5		)	(0.1		)	(1.0		)	(0.3		)
	Currency transaction effects	0.4			1.2			0.7			0.8
	Net loss (gain) on sales of investments and disposals of assets	—			(1.2		)	0.7			(1.1		)
	Currency transaction loss in Venezuela	—			—			—			8.5
	Other miscellaneous income	(1.7		)	(1.6		)	(2.9		)	(3.5		)
	Total other expense, net	$	10.9		$	3.9		$	20.9		$	11.8

Other_Comprehensive_Income

Other Comprehensive Income	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Other Comprehensive Income	'
	The following tables present the pre-tax, tax, and after-tax components of Grace's other comprehensive income (loss) for the three and six months ended June 30, 2014 and 2013:
	Three Months Ended June 30, 2014	Pre-Tax Amount			Tax Benefit/ (Expense)			After-Tax Amount
	(In millions)
	Defined benefit pension and other postretirement plans:
	Net gain due to postretirement plan changes	$	41.9		$	(14.7	)	$	27.2
	Gain on termination of postretirement plans	(7.9		)	2.8			(5.1		)
	Amortization of net prior service credit included in net periodic benefit cost	(0.2		)	—			(0.2		)
	Amortization of net deferred actuarial gain included in net periodic benefit cost	(0.1		)	0.1			—
	Benefit plans, net	33.7			(11.8		)	21.9
	Currency translation adjustments	7.3			—			7.3
	Loss from hedging activities	(3.7		)	1.3			(2.4		)
	Loss on securities available for sale	(0.9		)	0.3			(0.6		)
	Other comprehensive income attributable to W. R. Grace & Co. shareholders	$	36.4		$	(10.2	)	$	26.2
	Six Months Ended June 30, 2014	Pre-Tax Amount			Tax Benefit/ (Expense)			After-Tax Amount
	(In millions)
	Defined benefit pension and other postretirement plans:
	Net gain due to postretirement plan changes	$	41.9		$	(14.7	)	$	27.2
	Gain on termination of postretirement plans	(7.9		)	2.8			(5.1		)
	Amortization of net prior service credit included in net periodic benefit cost	(0.1		)	—			(0.1		)
	Amortization of net deferred actuarial gain included in net periodic benefit cost	(0.3		)	0.1			(0.2		)
	Benefit plans, net	33.6			(11.8		)	21.8
	Currency translation adjustments	5.2			—			5.2
	Loss from hedging activities	(2.6		)	0.9			(1.7		)
	Loss on securities available for sale	(0.8		)	0.3			(0.5		)
	Other comprehensive income attributable to W. R. Grace & Co. shareholders	$	35.4		$	(10.6	)	$	24.8
	Three Months Ended June 30, 2013	Pre-Tax Amount			Tax Benefit/ (Expense)			After-Tax Amount
	(In millions)
	Defined benefit pension and other postretirement plans:
	Amortization of net prior service cost included in net periodic benefit cost	$	0.2		$	—		$	0.2
	Amortization of net deferred actuarial loss included in net periodic benefit cost	0.1			—			0.1
	Other changes in funded status	4.4			(1.6		)	2.8
	Benefit plans, net	4.7			(1.6		)	3.1
	Currency translation adjustments	(16.9		)	—			(16.9		)
	Loss from hedging activities	(1.3		)	0.5			(0.8		)
	Other comprehensive loss attributable to W. R. Grace & Co. shareholders	$	(13.5	)	$	(1.1	)	$	(14.6	)
	Six Months Ended June 30, 2013	Pre-Tax Amount			Tax Benefit/ (Expense)			After-Tax Amount
	(In millions)
	Defined benefit pension and other postretirement plans:
	Amortization of net prior service cost included in net periodic benefit cost	$	0.4		$	(0.1	)	$	0.3
	Amortization of net deferred actuarial loss included in net periodic benefit cost	0.2			(0.1		)	0.1
	Other changes in funded status	4.4			(1.6		)	2.8
	Benefit plans, net	5			(1.8		)	3.2
	Currency translation adjustments	(23.3		)	—			(23.3		)
	Loss from hedging activities	(0.7		)	0.3			(0.4		)
	Other comprehensive loss attributable to W. R. Grace & Co. shareholders	$	(19.0	)	$	(1.5	)	$	(20.5	)
	The following tables present the changes in accumulated other comprehensive income, net of tax, for the six months ended June 30, 2014 and 2013:
	Six Months Ended June 30, 2014	Defined Benefit Pension and Other Postretirement Plans			Currency Translation Adjustments			Gains and Losses from Hedging Activities			Unrealized Loss on Investment			Gain (Loss) on Securities Available for Sale			Total
	(In millions)
	Beginning balance	$	6.6		$	5.2		$	(0.5	)	$	(0.8	)	$	0.1		$	10.6
	Other comprehensive income (loss) before reclassifications	27.2			5.2			(1.7		)	—			(0.5		)	30.2
	Amounts reclassified from accumulated other comprehensive income	(5.4		)	—			—			—			—			(5.4		)
	Net current-period other comprehensive income (loss)	21.8			5.2			(1.7		)	—			(0.5		)	24.8
	Ending balance	$	28.4		$	10.4		$	(2.2	)	$	(0.8	)	$	(0.4	)	$	35.4
	Six Months Ended June 30, 2013	Defined Benefit Pension and Other Postretirement Plans			Currency Translation Adjustments			Gains and Losses from Hedging Activities			Unrealized Loss on Investment			Total
	(In millions)
	Beginning balance	$	2		$	28.8		$	(0.3	)	$	(0.8	)	$	29.7
	Other comprehensive income (loss) before reclassifications	2.8			(23.3		)	0.3			—			(20.2		)
	Amounts reclassified from accumulated other comprehensive income	0.4			—			(0.7		)	—			(0.3		)
	Net current-period other comprehensive income (loss)	3.2			(23.3		)	(0.4		)	—			(20.5		)
	Ending balance	$	5.2		$	5.5		$	(0.7	)	$	(0.8	)	$	9.2
	Grace 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 amount represents the adjustments necessary to translate the balance sheets valued in local currencies to the U.S. dollar as of the end of each period presented, and to translate revenues and expenses at average exchange rates for each period presented.
	See Note 5 for a discussion of hedging activities.
	See Note 7 for a discussion of pension plans and other postretirement benefit plans.

Earnings_Per_Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	The following table shows a reconciliation of the numerators and denominators used in calculating basic and diluted earnings per share.
		Three Months Ended June 30,				Six Months Ended June 30,
	(In millions, except per share amounts)	2014		2013		2014		2013
	Numerators
	Net income attributable to W. R. Grace & Co. shareholders	$	136.2	$	90.3	$	186.3	$	149.4
	Denominators
	Weighted average common shares—basic calculation	75.9		76.3		76.5		76
	Dilutive effect of employee stock options	0.9		1.3		1		1.4
	Weighted average common shares—diluted calculation	76.8		77.6		77.5		77.4
	Basic earnings per share	$	1.79	$	1.18	$	2.44	$	1.97
	Diluted earnings per share	$	1.77	$	1.16	$	2.4	$	1.93
	There were approximately 0.3 million and 0.1 million anti-dilutive options outstanding for the three and six months ended June 30, 2014. There were approximately 0.3 million and 0.2 million anti-dilutive options outstanding for the three and six months ended June 30, 2013. The effect of the warrant for 10 million shares issued under the Joint Plan, as discussed in Note 2, is not included in diluted earnings per share.
	On February 4, 2014, Grace announced that the Grace Board of Directors had authorized a share repurchase program of up to $500 million expected to be completed over the following 12 to 24 months at the discretion of management. During the six months ended June 30, 2014, Grace repurchased 2,437,294 shares of Company common stock for $233.7 million pursuant to the terms of the share repurchase program.

Operating_Segment_Information

Operating Segment Information	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Operating Segment Information	'
	Grace is a global producer of specialty chemicals and specialty materials. Grace manages its business through three operating segments: Grace Catalysts Technologies, Grace Materials Technologies, and Grace Construction Products. Grace Catalysts Technologies includes catalysts and related products and technologies used in refining, petrochemical and other chemical manufacturing applications. Grace's Advanced Refining Technologies (ART) joint venture is managed in this segment. ART is an unconsolidated affiliate, and Grace accounts for ART using the equity method as discussed in Note 15. Grace Materials Technologies includes packaging technologies and engineered materials, coatings and sealants used in consumer, industrial, and pharmaceutical applications. Grace Construction Products includes specialty construction chemicals and specialty building materials used in commercial, infrastructure and residential construction. Intersegment sales are eliminated in consolidation. The table below presents information related to Grace's operating segments. Only those corporate expenses directly related to the operating segments are allocated for reporting purposes. All remaining corporate items are reported separately and labeled as such.
	Grace excludes defined benefit pension expense from the calculation of segment operating income. Grace believes that the exclusion of defined benefit pension expense provides a better indicator of its operating segment performance as defined benefit pension expense is not managed at an operating segment level.
	Grace defines Adjusted EBIT (a non-GAAP financial measure) to be net income adjusted for interest income and expense, income taxes, costs related to Chapter 11, asbestos-related costs, restructuring expenses and asset impairments, pension costs other than service and interest costs, expected returns on plan assets, and amortization of prior service costs/credits, certain income and expense items related to divested businesses, product lines, and certain other investments and gains and losses on sales of businesses, product lines, and certain other investments. In the 2013 first quarter, Grace also adjusted for the currency transaction loss incurred on its Venezuelan cash balances of $6.9 million before taxes.
	Operating Segment Data
		Three Months Ended June 30,						Six Months Ended June 30,
	(In millions)	2014			2013			2014			2013
	Net Sales
	Catalysts Technologies	$	313.2		$	290.9		$	597.7		$	557.4
	Materials Technologies	236.1			228.7			455.9			443.6
	Construction Products	288.7			283.2			528.9			511.7
	Total	$	838		$	802.8		$	1,582.50		$	1,512.70
	Adjusted EBIT
	Catalysts Technologies segment operating income	$	97.5		$	93.8		$	168.7		$	171
	Materials Technologies segment operating income	49.7			44.8			95.2			89.1
	Construction Products segment operating income	45			45.3			70.4			68.1
	Corporate costs	(22.8		)	(23.7		)	(45.3		)	(44.5		)
	Gain on termination of postretirement plans related to current businesses	4.7			—			4.7			—
	Certain pension costs	(8.0		)	(6.9		)	(16.3		)	(13.6		)
	Total	$	166.1		$	153.3		$	277.4		$	270.1
	Corporate costs include corporate support function costs and other corporate costs such as professional fees, insurance premiums, and non-asbestos environmental remediation.
	Grace Adjusted EBIT for the three and six months ended June 30, 2014 and 2013, is reconciled below to income before income taxes presented in the accompanying Consolidated Statements of Operations.
	Reconciliation of Operating Segment Data to Financial Statements
		Three Months Ended June 30,						Six Months Ended June 30,
	(In millions)	2014			2013			2014			2013
	Grace Adjusted EBIT	$	166.1		$	153.3		$	277.4		$	270.1
	Costs related to Chapter 11	(3.0		)	(3.3		)	(9.3		)	(7.1		)
	Asbestos-related costs	(4.3		)	(2.1		)	(5.8		)	(4.2		)
	Asbestos and bankruptcy-related charges, net	2.4			—			(6.4		)	—
	Pension MTM adjustment and other related costs, net	—			—			4.8			(2.5		)
	Gain on termination of postretirement plans related to divested businesses	3.2			—			3.2			—
	Restructuring expenses and asset impairments	(11.7		)	(4.3		)	(12.4		)	(5.1		)
	Gain on sale of product line	0.2			—			0.2			—
	Income and expense items related to divested businesses	(0.2		)	—			(0.2		)	—
	Interest expense and related financing costs	(11.1		)	(10.9		)	(22.3		)	(21.4		)
	Interest accretion on deferred payment obligations	(13.6		)	—			(21.8		)	—
	Currency transaction loss on cash in Venezuela	—			—			—			(6.9		)
	Interest income	0.5			0.1			1			0.3
	Net income attributable to noncontrolling interests	0.5			0.5			0.7			0.8
	Income before income taxes	$	129		$	133.3		$	209.1		$	224
	The table below presents information related to the geographic areas in which Grace operates. Sales are attributed to geographic areas based on customer location.
	Geographic Area Data
		Three Months Ended June 30,						Six Months Ended June 30,
	(In millions)	2014			2013			2014			2013
	Net Sales
	United States	$	248		$	230		$	470.2		$	441.1
	Canada and Puerto Rico	21.6			17.9			38.2			33.5
	Total North America	269.6			247.9			508.4			474.6
	Europe Middle East Africa	288.7			288.1			558.4			542.5
	Asia Pacific	181.9			173.1			336.9			323.7
	Latin America	97.8			93.7			178.8			171.9
	Total	$	838		$	802.8		$	1,582.50		$	1,512.70

Unconsolidated_Affiliate

Unconsolidated Affiliate	6 Months Ended
	Jun. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
Unconsolidated Affiliate	'
	Unconsolidated Affiliate
	Grace accounts for its 50% ownership interest in ART using the equity method of accounting. Grace's investment in ART amounted to $102.7 million and $96.2 million as of June 30, 2014, and December 31, 2013, respectively, and the amount included in "equity in earnings of unconsolidated affiliate" in the accompanying Consolidated Statements of Operations totaled $3.1 million and $6.8 million for the three and six months ended June 30, 2014, compared with $9.2 million and $14.3 million for the three and six months ended June 30, 2013, respectively.
	Grace and ART transact business on a regular basis and maintain several agreements in order to support the joint venture. These agreements are treated as related party activities with an unconsolidated affiliate. The table below presents summary financial data related to transactions between Grace and ART.
		Three Months Ended June 30,				Six Months Ended June 30,
	(In millions)	2014		2013		2014		2013
	Grace sales of catalysts to ART	$	64.5	$	52.1	$	130	$	105
	Charges for fixed costs, research and development and selling, general and administrative services to ART	7.1		7.1		14.6		15.5
	Grace and Chevron provide lines of credit in the amount of $15.0 million each at a commitment fee of 0.1% of the credit amount. These agreements expire on February 27, 2015. No amounts were outstanding at June 30, 2014, and December 31, 2013.

Subsequent_Event_Subsequent_Ev

Subsequent Event Subsequent Event (Notes)	6 Months Ended
	Jun. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events [Text Block]	'
	Subsequent Event
	As described in Note 2, pursuant to the Joint Plan, Grace has entered into an agreement with the PI Trust (the "Deferred Payment Agreement (PI)") that provides for deferred payments to the PI Trust of $110 million per year for 5 years beginning in 2019 and $100 million per year for 10 years beginning in 2024 and an agreement with the PI Trust and the PD Trust (the "Share Issuance Agreement") that secures such obligation and certain obligations to the PD Trust by obligating the Company to issue 77,372,257 shares of Company common stock in the event of default of such obligations.
	On August 1, 2014, Grace and the PI Trust entered into an Obligation Termination Agreement (the "Termination Agreement") to terminate all of the obligations of Grace under the Deferred Payment Agreement (PI) and, as applicable to the PI Trust, the Share Issuance Agreement, for a cash payment of $632.0 million (the "Consideration") to be paid at a subsequent closing. The closing of the transactions set forth in the Termination Agreement is to be no later than three business days after Grace receives the proceeds of a financing to fund the consideration but in no event later than October 31, 2014, subject to the satisfaction of certain closing conditions. Grace’s obligation to consummate the transactions set forth in the Termination Agreement is not subject to the receipt of the proceeds of any financing. As a result of the Termination Agreement, Grace expects to record accelerated interest accretion of approximately $30 million in the 2014 third quarter.

Summary_of_Significant_Account

Summary of Significant Accounting and Financial Reporting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Use of Estimates	'
	Use of Estimates    The preparation of financial statements in conformity with U.S. generally accepted accounting principles (U.S. 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. Grace'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, such as asbestos-related matters and litigation (see Note 2), income taxes (see Note 6), and environmental remediation (see Note 9);
	•	Pension and postretirement liabilities that depend on assumptions regarding participant life spans, future inflation, discount rates and total returns on invested funds (see Note 7); and
	•	Realization values of net deferred tax assets, which depend on projections of future taxable income (see Note 6).
Revenue Recognition, Services, Licensing Fees	'
	Licensing Revenue Recognition    Grace typically bundles the license, the basic process design package, training, and software into one fixed price contract. The fixed price contract revenue is recognized on a straight-line basis over the period of performance of the contract, except for contingent revenue associated with a final performance guarantee. Revenue associated with the performance guarantee is considered contingent and therefore revenue is recognized when customer acceptance is obtained. Other services that are sold in connection with license arrangements generally qualify for separate accounting, with revenue recognized as earned.
New Accounting Standards, Policy	'
	Effect of New Accounting Standards    In July 2013, the FASB issued ASU 2013-11 "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists." This update is intended to improve the consistency surrounding the presentation of an unrecognized tax benefit when a net operating loss carryforward exists, requiring the unrecognized tax benefit to be presented as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The new requirements are effective for fiscal years beginning after December 15, 2013, and for interim periods within those fiscal years, with early adoption permitted. Grace adopted this standard for the 2014 first quarter, and it did not have a material effect on the Consolidated Financial Statements.
	In May 2014, the FASB issued ASU 2014-09 "Revenue from Contracts with Customers." This update is intended to remove inconsistencies and weaknesses in revenue requirements; provide a more robust framework for addressing revenue issues; improve comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets; provide more useful information to users of financial statements through improved disclosure requirements; and simplify the preparation of financial statements by reducing the number of requirements to which an entity must refer. The new requirements are effective for fiscal years beginning after December 15, 2016, and for interim periods within those fiscal years, with early adoption not permitted. Grace will adopt this standard when it becomes applicable and is currently evaluating its effect on the Consolidated Financial Statements.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Tables)	6 Months Ended
	Jun. 30, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	'
	These changes have been reported through retrospective application of the new policies to all periods presented. The impacts of all adjustments made to the financial statements are summarized below:
	Consolidated Statements of Operations
		Three months ended June 30, 2013
	(In millions, except per share amounts)	Previously Reported			Revised			Effect of Change
	Cost of goods sold	$	499.5		$	501.9		$	2.4
	Gross profit	303.3			300.9			(2.4		)
	Selling, general and administrative expenses	137.6			142.1			4.5
	Defined benefit pension expense	18.1			—			(18.1		)
	Total costs and expenses	181.2			167.6			(13.6		)
	Income before income taxes	122.1			133.3			11.2
	Provision for income taxes	(38.8		)	(42.5		)	(3.7		)
	Net income	83.3			90.8			7.5
	Net income attributable to W. R. Grace & Co. shareholders	82.8			90.3			7.5
	Basic earnings per share
	Net income attributable to W. R. Grace & Co. shareholders	1.09			1.18			0.09
	Diluted earnings per share
	Net income attributable to W. R. Grace & Co. shareholders	1.07			1.16			0.09
		Six months ended June 30, 2013
	(In millions, except per share amounts)	Previously Reported			Revised			Effect of Change
	Cost of goods sold	$	945.6		$	952.8		$	7.2
	Gross profit	567.1			559.9			(7.2		)
	Selling, general and administrative expenses	266.5			275.4			8.9
	Defined benefit pension expense	36.7			—			(36.7		)
	Total costs and expenses	363.7			335.9			(27.8		)
	Income before income taxes	203.4			224			20.6
	Provision for income taxes	(66.9		)	(73.8		)	(6.9		)
	Net income	136.5			150.2			13.7
	Net income attributable to W. R. Grace & Co. shareholders	135.7			149.4			13.7
	Basic earnings per share
	Net income attributable to W. R. Grace & Co. shareholders	1.79			1.97			0.18
	Diluted earnings per share
	Net income attributable to W. R. Grace & Co. shareholders	1.75			1.93			0.18
	Consolidated Statements of Cash Flows
		Six months ended June 30, 2013
	(In millions)	Previously Reported			Revised			Effect of Change
	Cash flows from operating activities:
	Net income	$	136.5		$	150.2		$	13.7
	Provision for income taxes	66.9			73.8			6.9
	Defined benefit pension expense	36.7			16.1			(20.6		)
	Inventories	(39.5		)	(37.0		)	2.5
	All other items, net(1)	(47.7		)	(50.2		)	(2.5		)
	_______________________________________________________________________________
	-1	Includes only those items which relate to the change in accounting method to mark-to-market accounting.
	Consolidated Statements of Equity
		30-Jun-13
	(In millions)	Previously Reported			Revised			Effect of Change
	Retained earnings (Accumulated Deficit)
	Beginning balance	$	395.2		$	(240.3	)	$	(635.5	)
	Net income	135.7			149.4			13.7
	Ending balance	530.9			(90.9		)	(621.8		)
	Accumulated other comprehensive income (loss)
	Beginning balance	$	(607.3	)	$	29.7		$	637
	Other comprehensive income (loss)	45.8			(20.5		)	(66.3		)
	Ending balance	(561.5		)	9.2			570.7
	Total equity	$	534.1		$	483		$	(51.1	)
	Consolidated Statements of Comprehensive Income
		Three months ended June 30, 2013
		Previously Reported			Revised			Effect of Change
	Net income	$	83.3		$	90.8		$	7.5
	Defined benefit pension and other postretirement plans, net of income taxes	33.3			3.1			(30.2		)
	Currency translation adjustments	(16.8		)	(16.9		)	(0.1		)
	Total other comprehensive income (loss)	15.3			(15.0		)	(30.3		)
	Comprehensive income	98.6			75.8			(22.8		)
Comprehensive income attributable to W. R. Grace & Co. shareholders	98.5			75.7			(22.8		)
	Six months ended June 30, 2013
	Previously Reported			Revised			Effect of Change
Net income	$	136.5		$	150.2		$	13.7
Defined benefit pension and other postretirement plans, net of income taxes	69.5			3.2			(66.3		)
Currency translation adjustments	(23.3		)	(23.3		)	—
Total other comprehensive income (loss)	45.6			(20.7		)	(66.3		)
Comprehensive income	182.1			129.5			(52.6		)
Comprehensive income attributable to W. R. Grace & Co. shareholders	181.5			128.9			(52.6		)

Chapter_11_Information_Tables

Chapter 11 Information (Tables)	6 Months Ended
	Jun. 30, 2014
Reorganizations [Abstract]	'
Components of liabilities subject to compromise	'
	The table below sets forth the components of liabilities subject to compromise as of December 31, 2013:
	(In millions)	December 31,
		2013
	Asbestos-related contingencies	$	2,092.40
	Pre-petition bank debt plus accrued interest	1,100.00
	Environmental contingencies	134.5
	Unfunded special pension arrangements	129.4
	Income tax contingencies	76.6
	Postretirement benefits other than pension	57.2
	Drawn letters of credit plus accrued interest	37.8
	Accounts payable	34.3
	Retained obligations of divested businesses	29.9
	Other accrued liabilities	94.3
	Reclassification to current liabilities(1)	(10.3		)
	Total Liabilities Subject to Compromise	$	3,776.10
	_______________________________________________________________________________
	-1	As of December 31, 2013, $10.3 million of certain pension and postretirement benefit obligations subject to compromise have been presented in "other current liabilities" in the accompanying Consolidated Balance Sheets in accordance with ASC 715 "Compensation—Retirement Benefits."
Chapter 11 Expenses	'
	Chapter 11 Expenses
		Three Months Ended June 30,						Six Months Ended June 30,
	(In millions)	2014			2013			2014			2013
	Legal and financial advisory fees	$	3		$	3.8		$	9.2		$	8.8
	Interest income	—			(0.5		)	(0.1		)	(0.7		)
	Chapter 11 expenses, net of interest income	$	3		$	3.3		$	9.1		$	8.1
Debtor-in-Possession Statements of Operations	'
	W. R. Grace & Co.—Chapter 11 Filing Entities
	Debtor-in-Possession Statement of Operations
	(In millions) (Unaudited)	Six Months Ended
		June 30,
		2013
	Net sales, including intercompany	$	720.3
	Cost of goods sold, including intercompany, exclusive of depreciation and amortization shown separately below	444.1
	Selling, general and administrative expenses	121
	Depreciation and amortization	34.6
	Chapter 11 expenses, net of interest income	8.1
	Research and development expenses	18.8
	Interest expense and related financing costs	18.6
	Other income, net	(31.5		)
		613.7
	Income before income taxes and equity in net income of non-filing entities	106.6
	Provision for income taxes	(45.3		)
	Income before equity in net income of non-filing entities	61.3
	Equity in net income of non-filing entities	88.1
	Net income attributable to W. R. Grace & Co. shareholders	$	149.4
Debtor-in-Possession Statements of Cash Flows	'
	W. R. Grace & Co.—Chapter 11 Filing Entities
	Debtor-in-Possession Statement of Cash Flows
	(In millions) (Unaudited)	Six Months Ended
		June 30,
		2013
	Operating Activities
	Net income attributable to W. R. Grace & Co. shareholders	$	149.4
	Reconciliation to net cash provided by operating activities:
	Depreciation and amortization	34.6
	Equity in net income of non-filing entities	(88.1		)
	Provision for income taxes	45.3
	Income taxes paid, net of refunds	(3.4		)
	Defined benefit pension expense	7.4
	Payments under defined benefit pension arrangements	(52.8		)
	Changes in assets and liabilities, excluding the effect of foreign currency translation:
	Trade accounts receivable	(10.3		)
	Inventories	(29.8		)
	Accounts payable	16.8
	All other items, net	14.4
	Net cash provided by operating activities	83.5
	Investing Activities
	Capital expenditures	(39.9		)
	Transfer to short-term investments	(500.0		)
	Transfer to restricted cash and cash equivalents	5.1
	Net cash used for investing activities	(534.8		)
	Financing Activities
	Borrowings under credit arrangements	—
	Repayments under credit arrangements	(0.4		)
	Proceeds from exercise of stock options	25.2
	Net cash provided by financing activities	24.8
	Net decrease in cash and cash equivalents	(426.5		)
	Cash and cash equivalents, beginning of period	1,064.20
	Cash and cash equivalents, end of period	$	637.7
Debtor-in-Possession Balance Sheets	'
	W. R. Grace & Co.—Chapter 11 Filing Entities
	Debtor-in-Possession Balance Sheet
	(In millions) (Unaudited)	31-Dec-13
	ASSETS
	Current Assets
	Cash and cash equivalents	$	585.1
	Restricted cash and cash equivalents	340.5
	Trade accounts receivable, net	149.7
	Receivables from non-filing entities, net	173
	Inventories	138.9
	Other current assets	69.3
	Total Current Assets	1,456.50
	Properties and equipment, net	484.5
	Goodwill	279.9
	Technology and other intangible assets, net	249.1
	Deferred income taxes	817.3
	Asbestos-related insurance	500
	Loans receivable from non-filing entities, net	283.8
	Investment in non-filing entities	531.3
	Investment in unconsolidated affiliate	96.2
	Other assets	16.5
	Total Assets	$	4,715.10
	LIABILITIES AND EQUITY
	Liabilities Not Subject to Compromise
	Current liabilities	$	247.4
	Underfunded defined benefit pension plans	52.2
	Other liabilities	78.7
	Total Liabilities Not Subject to Compromise	378.3
	Liabilities Subject to Compromise	3,776.10
	Total Liabilities	4,154.40
	Total W. R. Grace & Co. Shareholders' Equity	560.6
	Noncontrolling interests in Chapter 11 filing entities	0.1
	Total Equity	560.7
	Total Liabilities and Equity	$	4,715.10

Inventories_Tables

Inventories (Tables)	6 Months Ended
	Jun. 30, 2014
Inventory Disclosure [Abstract]	'
Schedule of inventories	'
	(In millions)	June 30,		December 31,
		2014		2013
	Raw materials	$	90.6	$	69.7
	In process	48.9		41.8
	Finished products	162.7		152.4
	Other	32.4		31.4
		$	334.6	$	295.3

Debt_Tables

Debt (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Disclosure of debt	'
	Components of Debt
	(In millions)	June 30,			December 31,
		2014			2013
	U.S. dollar term loan, net of unamortized discount of $2.2 at June 30, 2014	$	696		$	—
	Euro term loan, net of unamortized discount of $0.5 at June 30, 2014	203.2			—
	Revolving credit facility	50			—
	Debt payable—unconsolidated affiliate	30.1			28.8
	Other borrowings	94.1			81.9
	Total debt	1,073.40			110.7
	Less debt payable within one year	157.4			81.1
	Debt payable after one year	$	916		$	29.6
	Debt Subject to Compromise
	Bank borrowings	$	—		$	500
	Accrued interest on bank borrowings	—			471
	Default interest settlement	—			129
	Drawn letters of credit	—			26.7
	Accrued interest on drawn letters of credit	—			11.1
		$	—		$	1,137.80
	Weighted average interest rates on total debt	3.3		%	3.6		%

Fair_Value_Measurements_and_Ri1

Fair Value Measurements and Risk (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of assets and liabilities measured at fair value on a recurring basis	'
	The following tables present the fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2014, and December 31, 2013:
		Fair Value Measurements at June 30, 2014, Using
	(In millions)	Total				Quoted Prices in Active Markets for Identical Assets or Liabilities				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets
	Currency derivatives	$	2.2			$	—			$	2.2	$	—
	Commodity derivatives	0.1				—				0.1		—
	Total Assets	$	2.3			$	—			$	2.3	$	—
	Liabilities
	Currency derivatives	$	0.2			$	—			$	0.2	$	—
	Interest rate derivatives	2.8				—				2.8		—
	Total Liabilities	$	3			$	—			$	3	$	—
		Fair Value Measurements at December 31, 2013, Using
	(In millions)	Total				Quoted Prices in Active Markets for Identical Assets or Liabilities				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets
	Currency derivatives	$	2.1			$	—			$	2.1	$	—
	Total Assets	$	2.1			$	—			$	2.1	$	—
	Liabilities
	Currency derivatives	$	6.9			$	—			$	6.9	$	—
	Commodity derivatives	0.1				—				0.1		—
	Total Liabilities	$	7			$	—			$	7	$	—
Schedule of the location and fair values of derivative instruments included in the Consolidated Balance Sheets	'
	The following tables present the location and fair values of derivative instruments included in the Consolidated Balance Sheets as of June 30, 2014, and December 31, 2013:
	30-Jun-14	Asset Derivatives						Liability Derivatives
	(In millions)	Balance Sheet		Fair Value				Balance Sheet		Fair Value
		Location						Location
	Derivatives designated as hedging instruments under ASC 815:
	Commodity contracts	Other current assets		$	0.1			Other current liabilities		$	—
	Currency contracts	Other current assets		1				Other current liabilities		—
	Interest rate contracts	Other current assets		—				Other current liabilities		1
	Currency contracts	Other assets		0.9				Other liabilities		—
	Interest rate contracts	Other assets		—				Other liabilities		1.8
	Derivatives not designated as hedging instruments under ASC 815:
	Currency contracts	Other current assets		0.3				Other current liabilities		0.2
	Currency contracts	Other assets		—				Other liabilities		—
	Total derivatives			$	2.3					$	3
	December 31, 2013	Asset Derivatives						Liability Derivatives
	(In millions)	Balance Sheet		Fair Value				Balance Sheet		Fair Value
		Location						Location
	Derivatives designated as hedging instruments under ASC 815:
	Commodity contracts	Other current assets		$	—			Other current liabilities		$	0.1
	Currency contracts	Other current assets		1				Other current liabilities		—
	Currency contracts	Other assets		1				Other liabilities		—
	Derivatives not designated as hedging instruments under ASC 815:
	Currency contracts	Other current assets		0.1				Other current liabilities		6.9
	Total derivatives			$	2.1					$	7
Schedule of the location and amount of gains and losses on derivative instruments included in the Consolidated Statements of Operations, or initially recognized in other comprehensive income (loss) ("OCI"), when applicable	'
	The following tables present the location and amount of gains and losses on nonderivative instruments designated as net investment hedges. There were no reclassifications of the effective portion of net investment hedges out of OCI and into earnings for the periods presented in the tables below.
	Three Months Ended June 30, 2014	Amount of Gain or (Loss) Recognized in OCI in Currency Translation Adjustments				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income
	(In millions)	(Effective Portion)				(Ineffective Portion)		(Ineffective Portion)
	Nonderivatives in ASC 815 net investment hedging relationships:
	Foreign currency denominated debt	$	1.8			Not applicable		$	—
	Total nonderivatives	$	1.8					$	—
	Six Months Ended June 30, 2014	Amount of Gain or (Loss) Recognized in OCI in Currency Translation Adjustments				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income
	(In millions)	(Effective Portion)				(Ineffective Portion)		(Ineffective Portion)
	Nonderivatives in ASC 815 net investment hedging relationships:
	Foreign currency denominated debt	$	1.8			Not applicable		$	—
	Total nonderivatives	$	1.8					$	—
	The following tables present the location and amount of gains and losses on derivative instruments included in the Consolidated Statements of Operations or, when applicable, gains and losses initially recognized in other comprehensive income ("OCI") for the three and six months ended June 30, 2014 and 2013:
	Three Months Ended June 30, 2014	Amount of Gain or (Loss) Recognized in OCI on Derivatives				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from OCI into Income
	(In millions)	(Effective Portion)				(Effective Portion)		(Effective Portion)
	Derivatives in ASC 815 cash flow hedging relationships:
	Interest rate contracts	$	(3.9	)		Interest expense		$	—
	Currency contracts	(0.6		)		Other expense		(0.7		)
	Commodity contracts	—				Cost of goods sold		(0.1		)
	Total derivatives	$	(4.5	)				$	(0.8	)
						Location of Gain or (Loss) Recognized in Income on Derivatives		Amount of Gain or (Loss) Recognized in Income on Derivatives
	Derivatives not designated as hedging instruments under ASC 815:
	Currency contracts					Other expense		$	0.3
	Six Months Ended June 30, 2014	Amount of Gain or (Loss) Recognized in OCI on Derivatives				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from OCI into Income
	(In millions)	(Effective Portion)				(Effective Portion)		(Effective Portion)
	Derivatives in ASC 815 cash flow hedging relationships:
	Interest rate contracts	$	(2.9	)		Interest expense		$	—
	Currency contracts	(0.1		)		Other expense		(0.2		)
	Commodity contracts	0.4				Cost of goods sold		0.2
	Total derivatives	$	(2.6	)				$	—
						Location of Gain or (Loss) Recognized in Income on Derivatives		Amount of Gain or (Loss) Recognized in Income on Derivatives
	Derivatives not designated as hedging instruments under ASC 815:
	Currency contracts					Other expense		$	4.8
	Three Months Ended June 30, 2013	Amount of Gain or (Loss) Recognized in OCI on Derivatives				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from OCI into Income
	(In millions)	(Effective Portion)				(Effective Portion)		(Effective Portion)
	Derivatives in ASC 815 cash flow hedging relationships:
	Currency contracts	$	1			Other expense		$	1
	Currency contracts	—				Cost of goods sold		(0.2		)
	Commodity contracts	(1.0		)		Cost of goods sold		0.5
	Total derivatives	$	—					$	1.3
						Location of Gain or (Loss) Recognized in Income on Derivatives		Amount of Gain or (Loss) Recognized in Income on Derivatives
	Derivatives not designated as hedging instruments under ASC 815:
	Currency contracts					Other expense		$	(3.6	)
	Six Months Ended June 30, 2013	Amount of Gain or (Loss) Recognized in OCI on Derivatives				Location of Gain or (Loss) Reclassified from Accumulated OCI into Income		Amount of Gain or (Loss) Reclassified from OCI into Income
	(In millions)	(Effective Portion)				(Effective Portion)		(Effective Portion)
	Derivatives in ASC 815 cash flow hedging relationships:
	Currency contracts	$	0.7			Other expense		$	0.8
	Currency contracts	(0.2		)		Cost of goods sold		(0.1		)
	Commodity contracts	(0.3		)		Cost of goods sold		0.2
	Total derivatives	$	0.2					$	0.9
						Location of Gain or (Loss) Recognized in Income on Derivatives		Amount of Gain or (Loss) Recognized in Income on Derivatives
	Derivatives not designated as hedging instruments under ASC 815:
	Currency contracts					Other expense		$	4.1

Income_Taxes_Tables

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2014
Net Deferred Tax Assets by Country [Line Items]	'
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	'
	The following table summarizes the balance of deferred tax assets, net of deferred tax liabilities, at June 30, 2014, of $821.8 million:
		Deferred Tax Asset		Valuation Allowance			Net Deferred Tax Asset(2)
		(Net of Liabilities)
	United States—Federal(1)	$	729.4	$	(2.1	)	$	727.3
	United States—States(1)	70.6		(10.0		)	60.6
	Germany	26.4		—			26.4
	Other Foreign	7.8		(0.3		)	7.5
	Total	$	834.2	$	(12.4	)	$	821.8
	_______________________________________________________________________________
	-1	The U.S. Federal deductions generated at emergence of $670 million, the $490 million warrant settlement, and the $616 million present value of the deferred payment obligations as of June 30, 2014, account for a significant portion of the U.S. Federal and State deferred tax assets. The aforementioned settlement of the deferred payment obligations will increase Grace's NOLs by $632 million when paid.
	-2	The noncurrent deferred tax asset of $619.9 million reflected in the June 30, 2014, Consolidated Balance Sheet is net of $4.8 million of income tax contingencies related to these deferred tax assets.

Income_Taxes_Income_Taxes_Tabl

Income Taxes Income Taxes (Tables 2)	6 Months Ended
	Jun. 30, 2014
Operating Loss Carryforwards [Line Items]	'
Summary of Operating Loss Carryforwards [Table Text Block]	'
	The following table summarizes expiration dates in jurisdictions where we have, or will have, material tax loss carryforwards:
		Expiration Dates
	United States—Federal	2034 - 2035
	United States—States	2014 - 2035
	Brazil	Unlimited Carryforward
	Spain	2029 - 2030
	India	2015 - 2021

Pension_Plans_and_Other_Postre1

Pension Plans and Other Postretirement Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2014
Pension and Other Postretirement Benefit Expense [Abstract]	'
Net funded status of fully funded, underfunded, and unfunded pension plans	'
	Pension Plans    The following table presents the funded status of Grace's fully-funded, underfunded, and unfunded pension plans:
	(In millions)	June 30,			December 31,
		2014			2013
	Overfunded defined benefit pension plans	$	45.7		$	16.7
	Underfunded defined benefit pension plans	(18.8		)	(66.2		)
	Unfunded defined benefit pension plans(1)	(324.3		)	(233.4		)
	Total underfunded and unfunded defined benefit pension plans	(343.1		)	(299.6		)
	Unfunded defined benefit pension plans included in liabilities subject to compromise(1)	—			(123.6		)
	Pension liabilities included in other current liabilities	(15.7		)	(15.0		)
	Net funded status	$	(313.1	)	$	(421.5	)
Components of net periodic benefit cost (income)	'
	Components of Net Periodic Benefit Cost (Income)
		Three Months Ended June 30,
		2014									2013
		Pension						Other Post			Pension						Other Post
	(In millions)	U.S.			Non-U.S.			Retirement			U.S.			Non-U.S.			Retirement
	Service cost	$	5.9		$	2.8		$	0.1		$	6.3		$	2.7		$	—
	Interest cost	14.9			5.6			0.3			13.1			5.1			0.6
	Expected return on plan assets	(17.5		)	(3.9		)	—			(17.0		)	(3.5		)	—
	Amortization of prior service cost (credit)	0.2			—			(0.4		)	0.2			—			—
	Amortization of net deferred actuarial (gain) loss	—			—			(0.1		)	—			—			0.1
	Annual mark-to-market adjustment	—			—			—			—			—			—
	Gain on termination of postretirement plans	—			—			(7.9		)	—			—			—
	Net periodic benefit cost (income)	$	3.5		$	4.5		$	(8.0	)	$	2.6		$	4.3		$	0.7
		Six Months Ended June 30,
		2014									2013
		Pension						Other Post			Pension						Other Post
	(In millions)	U.S.			Non-U.S.			Retirement			U.S.			Non-U.S.			Retirement
	Service cost	$	11.8		$	5.5		$	0.1		$	12.6		$	5.4		$	0.1
	Interest cost	30.1			11.3			0.9			26			10.2			1.1
	Expected return on plan assets	(35.0		)	(7.8		)	—			(34.0		)	(7.0		)	—
	Amortization of prior service cost (credit)	0.4			—			(0.5		)	0.4			—			—
	Amortization of net deferred actuarial (gain) loss	—			—			(0.3		)	—			—			0.2
	Annual mark-to-market adjustment	(3.1		)	—			—			—			—			—
	Gain on termination of postretirement plans	—			—			(7.9		)	—			—			—
	Net periodic benefit cost (income)	$	4.2		$	9		$	(7.7	)	$	5		$	8.6		$	1.4

Other_Balance_Sheet_Accounts_T

Other Balance Sheet Accounts (Tables)	6 Months Ended
	Jun. 30, 2014
Other Balance Sheet Accounts	'
Schedule of other balance sheet accounts	'
	(In millions)	June 30,		December 31,
		2014		2013
	Other Current Liabilities
	Accrued compensation	$	57.4	$	62.4
	Income tax payable	32.6		32
	Customer volume rebates	32.3		33.3
	Environmental contingencies	21.3		1.3
	Deferred revenue	15.8		14.3
	Pension liabilities	15.7		15
	Deferred tax liability	0.1		0.1
	Other accrued liabilities	145.3		133.6
		$	320.5	$	292

Restructuring_Expenses_and_Rel1

Restructuring Expenses and Related Asset Impairments (Tables)	6 Months Ended
	Jun. 30, 2014
Restructuring and Related Activities [Abstract]	'
Schedule of restructuring expenses and related asset impairments	'
	Restructuring Expenses and Asset Impairments	Three Months Ended June 30,					Six Months Ended June 30,
	(In millions)	2014			2013		2014		2013
	Restructuring expenses	$	2		$	4.2	$	2.7	$	5
	Asset impairments	9.7			0.1		9.7		0.1
	Total restructuring expenses and asset impairments	$	11.7		$	4.3	$	12.4	$	5.1
Schedule of restructuring liability	'
	Restructuring Liability	Total
	(In millions)
	Balance, December 31, 2013	$	4.4
	Accruals for severance and other costs	2.7
	Payments	(3.4		)
	Balance, June 30, 2014	$	3.7

Other_Income_Expense_net_Table

Other (Income) Expense, net (Tables)	6 Months Ended
	Jun. 30, 2014
Other Income and Expenses [Abstract]	'
Schedule of other (income) expense, net	'
	Components of other expense, net are as follows:
		Three Months Ended June 30,						Six Months Ended June 30,
	(In millions)	2014			2013			2014			2013
	Restructuring expenses and asset impairments	$	11.7		$	4.3		$	12.4		$	5.1
	Provision for environmental remediation	3.4			1.3			4.6			2.3
	Asbestos and bankruptcy-related charges, net	(2.4		)	—			6.4			—
	Interest income	(0.5		)	(0.1		)	(1.0		)	(0.3		)
	Currency transaction effects	0.4			1.2			0.7			0.8
	Net loss (gain) on sales of investments and disposals of assets	—			(1.2		)	0.7			(1.1		)
	Currency transaction loss in Venezuela	—			—			—			8.5
	Other miscellaneous income	(1.7		)	(1.6		)	(2.9		)	(3.5		)
	Total other expense, net	$	10.9		$	3.9		$	20.9		$	11.8

Other_Comprehensive_Income_Tab

Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Tabular disclosure 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 Grace's other comprehensive income (loss) for the three and six months ended June 30, 2014 and 2013:
	Three Months Ended June 30, 2014	Pre-Tax Amount			Tax Benefit/ (Expense)			After-Tax Amount
	(In millions)
	Defined benefit pension and other postretirement plans:
	Net gain due to postretirement plan changes	$	41.9		$	(14.7	)	$	27.2
	Gain on termination of postretirement plans	(7.9		)	2.8			(5.1		)
	Amortization of net prior service credit included in net periodic benefit cost	(0.2		)	—			(0.2		)
	Amortization of net deferred actuarial gain included in net periodic benefit cost	(0.1		)	0.1			—
	Benefit plans, net	33.7			(11.8		)	21.9
	Currency translation adjustments	7.3			—			7.3
	Loss from hedging activities	(3.7		)	1.3			(2.4		)
	Loss on securities available for sale	(0.9		)	0.3			(0.6		)
	Other comprehensive income attributable to W. R. Grace & Co. shareholders	$	36.4		$	(10.2	)	$	26.2
	Six Months Ended June 30, 2014	Pre-Tax Amount			Tax Benefit/ (Expense)			After-Tax Amount
	(In millions)
	Defined benefit pension and other postretirement plans:
	Net gain due to postretirement plan changes	$	41.9		$	(14.7	)	$	27.2
	Gain on termination of postretirement plans	(7.9		)	2.8			(5.1		)
	Amortization of net prior service credit included in net periodic benefit cost	(0.1		)	—			(0.1		)
	Amortization of net deferred actuarial gain included in net periodic benefit cost	(0.3		)	0.1			(0.2		)
	Benefit plans, net	33.6			(11.8		)	21.8
	Currency translation adjustments	5.2			—			5.2
	Loss from hedging activities	(2.6		)	0.9			(1.7		)
	Loss on securities available for sale	(0.8		)	0.3			(0.5		)
	Other comprehensive income attributable to W. R. Grace & Co. shareholders	$	35.4		$	(10.6	)	$	24.8
	Three Months Ended June 30, 2013	Pre-Tax Amount			Tax Benefit/ (Expense)			After-Tax Amount
	(In millions)
	Defined benefit pension and other postretirement plans:
	Amortization of net prior service cost included in net periodic benefit cost	$	0.2		$	—		$	0.2
	Amortization of net deferred actuarial loss included in net periodic benefit cost	0.1			—			0.1
	Other changes in funded status	4.4			(1.6		)	2.8
	Benefit plans, net	4.7			(1.6		)	3.1
	Currency translation adjustments	(16.9		)	—			(16.9		)
	Loss from hedging activities	(1.3		)	0.5			(0.8		)
	Other comprehensive loss attributable to W. R. Grace & Co. shareholders	$	(13.5	)	$	(1.1	)	$	(14.6	)
	Six Months Ended June 30, 2013	Pre-Tax Amount			Tax Benefit/ (Expense)			After-Tax Amount
	(In millions)
	Defined benefit pension and other postretirement plans:
	Amortization of net prior service cost included in net periodic benefit cost	$	0.4		$	(0.1	)	$	0.3
	Amortization of net deferred actuarial loss included in net periodic benefit cost	0.2			(0.1		)	0.1
	Other changes in funded status	4.4			(1.6		)	2.8
	Benefit plans, net	5			(1.8		)	3.2
	Currency translation adjustments	(23.3		)	—			(23.3		)
	Loss from hedging activities	(0.7		)	0.3			(0.4		)
	Other comprehensive loss attributable to W. R. Grace & Co. shareholders	$	(19.0	)	$	(1.5	)	$	(20.5	)
Schedule of components of accumulated other comprehensive loss	'
	The following tables present the changes in accumulated other comprehensive income, net of tax, for the six months ended June 30, 2014 and 2013:
	Six Months Ended June 30, 2014	Defined Benefit Pension and Other Postretirement Plans			Currency Translation Adjustments			Gains and Losses from Hedging Activities			Unrealized Loss on Investment			Gain (Loss) on Securities Available for Sale			Total
	(In millions)
	Beginning balance	$	6.6		$	5.2		$	(0.5	)	$	(0.8	)	$	0.1		$	10.6
	Other comprehensive income (loss) before reclassifications	27.2			5.2			(1.7		)	—			(0.5		)	30.2
	Amounts reclassified from accumulated other comprehensive income	(5.4		)	—			—			—			—			(5.4		)
	Net current-period other comprehensive income (loss)	21.8			5.2			(1.7		)	—			(0.5		)	24.8
	Ending balance	$	28.4		$	10.4		$	(2.2	)	$	(0.8	)	$	(0.4	)	$	35.4
	Six Months Ended June 30, 2013	Defined Benefit Pension and Other Postretirement Plans			Currency Translation Adjustments			Gains and Losses from Hedging Activities			Unrealized Loss on Investment			Total
	(In millions)
	Beginning balance	$	2		$	28.8		$	(0.3	)	$	(0.8	)	$	29.7
	Other comprehensive income (loss) before reclassifications	2.8			(23.3		)	0.3			—			(20.2		)
	Amounts reclassified from accumulated other comprehensive income	0.4			—			(0.7		)	—			(0.3		)
	Net current-period other comprehensive income (loss)	3.2			(23.3		)	(0.4		)	—			(20.5		)
	Ending balance	$	5.2		$	5.5		$	(0.7	)	$	(0.8	)	$	9.2

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of 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 per share.
		Three Months Ended June 30,				Six Months Ended June 30,
	(In millions, except per share amounts)	2014		2013		2014		2013
	Numerators
	Net income attributable to W. R. Grace & Co. shareholders	$	136.2	$	90.3	$	186.3	$	149.4
	Denominators
	Weighted average common shares—basic calculation	75.9		76.3		76.5		76
	Dilutive effect of employee stock options	0.9		1.3		1		1.4
	Weighted average common shares—diluted calculation	76.8		77.6		77.5		77.4
	Basic earnings per share	$	1.79	$	1.18	$	2.44	$	1.97
	Diluted earnings per share	$	1.77	$	1.16	$	2.4	$	1.93

Operating_Segment_Information_

Operating Segment Information (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Schedule of operating segment data	'
	Operating Segment Data
		Three Months Ended June 30,						Six Months Ended June 30,
	(In millions)	2014			2013			2014			2013
	Net Sales
	Catalysts Technologies	$	313.2		$	290.9		$	597.7		$	557.4
	Materials Technologies	236.1			228.7			455.9			443.6
	Construction Products	288.7			283.2			528.9			511.7
	Total	$	838		$	802.8		$	1,582.50		$	1,512.70
	Adjusted EBIT
	Catalysts Technologies segment operating income	$	97.5		$	93.8		$	168.7		$	171
	Materials Technologies segment operating income	49.7			44.8			95.2			89.1
	Construction Products segment operating income	45			45.3			70.4			68.1
	Corporate costs	(22.8		)	(23.7		)	(45.3		)	(44.5		)
	Gain on termination of postretirement plans related to current businesses	4.7			—			4.7			—
	Certain pension costs	(8.0		)	(6.9		)	(16.3		)	(13.6		)
	Total	$	166.1		$	153.3		$	277.4		$	270.1
Schedule of reconciliation of operating segment data to financial statements	'
	Reconciliation of Operating Segment Data to Financial Statements
		Three Months Ended June 30,						Six Months Ended June 30,
	(In millions)	2014			2013			2014			2013
	Grace Adjusted EBIT	$	166.1		$	153.3		$	277.4		$	270.1
	Costs related to Chapter 11	(3.0		)	(3.3		)	(9.3		)	(7.1		)
	Asbestos-related costs	(4.3		)	(2.1		)	(5.8		)	(4.2		)
	Asbestos and bankruptcy-related charges, net	2.4			—			(6.4		)	—
	Pension MTM adjustment and other related costs, net	—			—			4.8			(2.5		)
	Gain on termination of postretirement plans related to divested businesses	3.2			—			3.2			—
	Restructuring expenses and asset impairments	(11.7		)	(4.3		)	(12.4		)	(5.1		)
	Gain on sale of product line	0.2			—			0.2			—
	Income and expense items related to divested businesses	(0.2		)	—			(0.2		)	—
	Interest expense and related financing costs	(11.1		)	(10.9		)	(22.3		)	(21.4		)
	Interest accretion on deferred payment obligations	(13.6		)	—			(21.8		)	—
	Currency transaction loss on cash in Venezuela	—			—			—			(6.9		)
	Interest income	0.5			0.1			1			0.3
	Net income attributable to noncontrolling interests	0.5			0.5			0.7			0.8
	Income before income taxes	$	129		$	133.3		$	209.1		$	224
Schedule of geographic area data	'
	Geographic Area Data
		Three Months Ended June 30,						Six Months Ended June 30,
	(In millions)	2014			2013			2014			2013
	Net Sales
	United States	$	248		$	230		$	470.2		$	441.1
	Canada and Puerto Rico	21.6			17.9			38.2			33.5
	Total North America	269.6			247.9			508.4			474.6
	Europe Middle East Africa	288.7			288.1			558.4			542.5
	Asia Pacific	181.9			173.1			336.9			323.7
	Latin America	97.8			93.7			178.8			171.9
	Total	$	838		$	802.8		$	1,582.50		$	1,512.70

Unconsolidated_Affiliate_Table

Unconsolidated Affiliate (Tables)	6 Months Ended
	Jun. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
Schedule of financial data related to transactions between Grace and ART	'
	The table below presents summary financial data related to transactions between Grace and ART.
		Three Months Ended June 30,				Six Months Ended June 30,
	(In millions)	2014		2013		2014		2013
	Grace sales of catalysts to ART	$	64.5	$	52.1	$	130	$	105
	Charges for fixed costs, research and development and selling, general and administrative services to ART	7.1		7.1		14.6		15.5

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Feb. 13, 2013	Apr. 02, 2001
	segment					entity
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'	'	'	'	'
Number of operating segments	3	'	'	'	'	'
Number of United States subsidiaries and affiliates filed voluntary petitions for reorganization	'	'	'	'	'	61
Currency Translation	'	'	'	'	'	'
Venezuela Currency Exchange Rate Point In Time	'	'	'	'	4.3	'
Venezuela Currency Exchange Rate Future	'	'	'	'	6.3	'
Currency transaction loss in Venezuela	$0	$0	'	$8.50	'	'
Reportable Segment	'	'	'	'	'	'
Currency Translation	'	'	'	'	'	'
Currency transaction loss in Venezuela	$1.60	'	'	'	'	'

Basis_of_Presentation_and_Summ3

Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies Schedule of Pension Recasting (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'	'	'	'	'
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$136.70	$90.80	$187	$150.20	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	570.8	483	570.8	483	571.2	319.8
Cost of goods sold	517.1	501.9	992.4	952.8	'	'
Gross Profit	320.9	300.9	590.1	559.9	'	'
Selling, general and administrative expenses	144	142.1	280.8	275.4	'	'
Defined Benefit Pension Expense	'	'	'	0	'	'
Total Costs and Expenses	191.9	167.6	381	335.9	'	'
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	129	133.3	209.1	224	'	'
Benefit from (provision for) income taxes	7.7	-42.5	-22.1	-73.8	'	'
Net Income (Loss) Available to Common Stockholders, Basic	136.2	90.3	186.3	149.4	'	'
Earnings Per Share, Basic	$1.79	$1.18	$2.44	$1.97	'	'
Earnings Per Share, Diluted	$1.77	$1.16	$2.40	$1.93	'	'
Pension and Other Postretirement Benefit Expense	'	'	11.5	16.1	'	'
Increase (Decrease) in Inventories	'	'	-39.8	-37	'	'
Other Operating Activities Cash Flow Statement Adjusted for Pension Revision	'	'	'	-50.2	'	'
Other Comprehensive Income (Loss), Net of Tax	26.2	-15	24.9	-20.7	'	'
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	21.9	3.1	21.8	3.2	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	7.3	-16.9	5.2	-23.3	'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	162.9	75.8	211.9	129.5	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	162.4	75.7	211.1	128.9	'	'
Scenario, Previously Reported [Member]	'	'	'	'	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'	'	'	'	'
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	'	83.3	'	136.5	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	'	534.1	'	534.1	'	'
Cost of goods sold	'	499.5	'	945.6	'	'
Gross Profit	'	303.3	'	567.1	'	'
Selling, general and administrative expenses	'	137.6	'	266.5	'	'
Defined Benefit Pension Expense	'	18.1	'	36.7	'	'
Total Costs and Expenses	'	181.2	'	363.7	'	'
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	'	122.1	'	203.4	'	'
Benefit from (provision for) income taxes	'	-38.8	'	-66.9	'	'
Net Income (Loss) Available to Common Stockholders, Basic	'	82.8	'	135.7	'	'
Earnings Per Share, Basic	'	$1.09	'	$1.79	'	'
Earnings Per Share, Diluted	'	$1.07	'	$1.75	'	'
Pension and Other Postretirement Benefit Expense	'	'	'	36.7	'	'
Increase (Decrease) in Inventories	'	'	'	39.5	'	'
Other Operating Activities Cash Flow Statement Adjusted for Pension Revision	'	'	'	-47.7	'	'
Other Comprehensive Income (Loss), Net of Tax	'	15.3	'	45.6	'	'
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	'	-33.3	'	-69.5	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	'	-16.8	'	-23.3	'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	98.6	'	182.1	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	98.5	'	181.5	'	'
Scenario, Adjustment [Member]	'	'	'	'	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'	'	'	'	'
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	'	7.5	'	13.7	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	'	-51.1	'	-51.1	'	'
Cost of goods sold	'	2.4	'	7.2	'	'
Gross Profit	'	-2.4	'	-7.2	'	'
Selling, general and administrative expenses	'	4.5	'	8.9	'	'
Defined Benefit Pension Expense	'	-18.1	'	-36.7	'	'
Total Costs and Expenses	'	-13.6	'	-27.8	'	'
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	'	11.2	'	20.6	'	'
Benefit from (provision for) income taxes	'	-3.7	'	-6.9	'	'
Net Income (Loss) Available to Common Stockholders, Basic	'	7.5	'	13.7	'	'
Earnings Per Share, Basic	'	$0.09	'	$0.18	'	'
Earnings Per Share, Diluted	'	$0.09	'	$0.18	'	'
Pension and Other Postretirement Benefit Expense	'	'	'	-20.6	'	'
Increase (Decrease) in Inventories	'	'	'	-2.5	'	'
Other Operating Activities Cash Flow Statement Adjusted for Pension Revision	'	'	'	-2.5	'	'
Other Comprehensive Income (Loss), Net of Tax	'	-30.3	'	-66.3	'	'
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	'	30.2	'	66.3	'	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	'	-0.1	'	0	'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	'	-22.8	'	-52.6	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	-22.8	'	-52.6	'	'
Retained Earnings	'	'	'	'	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'	'	'	'	'
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	'	'	186.3	'	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	202.1	-90.9	202.1	-90.9	15.8	-240.3
Net Income (Loss) Available to Common Stockholders, Basic	'	'	'	149.4	'	'
Other Comprehensive Income (Loss), Net of Tax	'	'	0	0	'	'
Retained Earnings | Scenario, Previously Reported [Member]	'	'	'	'	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'	'	'	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	'	530.9	'	530.9	'	395.2
Retained Earnings | Scenario, Adjustment [Member]	'	'	'	'	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'	'	'	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	'	-621.8	'	-621.8	'	-635.5
Net Income (Loss) Available to Common Stockholders, Basic	'	13.7	'	'	'	'
Accumulated Other Comprehensive Loss	'	'	'	'	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'	'	'	'	'
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	'	'	0	0	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	35.4	9.2	35.4	9.2	10.6	29.7
Other Comprehensive Income (Loss), Net of Tax	'	'	24.8	-20.5	'	'
Accumulated Other Comprehensive Loss | Scenario, Previously Reported [Member]	'	'	'	'	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'	'	'	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	'	-561.5	'	-561.5	'	-607.3
Other Comprehensive Income (Loss), Net of Tax	'	45.8	'	'	'	'
Accumulated Other Comprehensive Loss | Scenario, Adjustment [Member]	'	'	'	'	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'	'	'	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	'	570.7	'	570.7	'	637
Other Comprehensive Income (Loss), Net of Tax	'	($66.30)	'	'	'	'

Chapter_11_Information_Details

Chapter 11 Information (Details)

3 Months Ended

6 Months Ended

3 Months Ended

3 Months Ended

6 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Feb. 03, 2014

Dec. 31, 2013

Apr. 02, 2001

Jun. 30, 2014

Feb. 03, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Feb. 03, 2014

Jun. 30, 2014

Feb. 03, 2014

Feb. 03, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Feb. 03, 2014

Jan. 31, 2014

Oct. 31, 2008

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

entity

PI Trust

PI Trust

Personal Injury and Personal Damage Trusts [Member]

Personal Damage Trust [Member]

Personal Damage Trust [Member]

Personal Damage Trust [Member]

Fresenius Medical Care Holdings, Inc.

Fresenius Medical Care Holdings, Inc.

CANADA

UNITED STATES

Chapter 11 Filing Entities

Chapter 11 Filing Entities

Chapter 11 Filing Entities

Chapter 11 Filing Entities

Chapter 11 Filing Entities

CANADA

UNITED STATES

UNITED STATES

trust

claim

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Personal Damage Trust [Member]

Personal Damage Trust [Member]

CAD

Personal Damage Trust [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Property Damage Litigation [Member]

Property Damage Litigation [Member]

claim

payment

USD ($)

USD ($)

claim

claim

account

Chapter 11 information

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Chapter 11 expenses, net of interest income

$3,000,000

$3,300,000

$9,100,000

$8,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

$3,000,000

$3,300,000

$9,100,000

$8,100,000

'

'

'

'

Bankruptcy Proceedings, Number of Entities Included in Bankruptcy Filing

'

'

'

'

'

'

61

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

ZAI property damage claim funds

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,600,000

'

'

'

'

'

'

8,600,000

'

'

ZAI PD Account Funding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

34,400,000

'

'

'

'

'

'

'

'

'

'

Asbestos trusts established under Bankruptcy Code

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss Contingency, Pending Claims, Number

129,191

'

129,191

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds under Joint plan funding

'

'

'

'

'

'

'

'

557,700,000

'

'

'

39,900,000

'

111,400,000

'

'

'

'

'

'

'

'

'

'

Portion of PI Trust Funding from Grace Cash

'

'

'

'

464,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Portion of PI Trust Funding from Grace Insurance Proceeds in Escrow

'

'

'

'

93,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of warrants issued by entity to fund trust (in shares)

'

'

'

'

'

'

'

10,000,000

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise price of warrant (in dollars per share)

'

'

'

'

'

'

'

$17

$17

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value of Warrant Issued

'

'

'

'

'

'

'

490,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expiration period of warrant

'

'

'

'

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred payments per year for five years by the entity to the Trust

'

'

'

'

'

'

'

110,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Five Year Period in Which PI Trust Deferred Payments Will be Made

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred payments per year for ten years by the entity to the Trust

'

'

'

'

'

'

'

100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ten Year Period in Which PI Trust Deferred Payments Will be Made

'

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated Deferred Payment Obligation

'

'

567,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Recorded Unconditional Purchase Obligation Due in Third Year

'

'

'

'

'

'

'

'

'

'

'

'

'

27,500,000

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Shares, Issued

'

'

'

'

'

'

'

'

'

77,372,257

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Asbestos-related contingencies

'

'

'

'

'

2,092,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,092,400,000

'

'

'

Cash paid to resolve contingencies subject to Chapter 11 Including Interest Paid

'

'

499,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Bankruptcy Claims, Number Claims Filed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17,960

Bankruptcy Claims, Number Additional Claims Filed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,310

'

Number of PD Trust accounts

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Joint Plan Funds, Equivalent of Estimated Expenses, Period

'

'

'

'

'

'

'

'

'

'

'6 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Non-ZAI PD Claim Payments to PD Trust

400,000

'

400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Non-ZAI PD Claims Resolved After Effective Date

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

ZAI initial payment

'

'

'

'

'

'

'

'

'

'

'

'

'

30,000,000

'

'

'

'

'

'

'

'

'

'

'

Cash payment by entity to the Trust on the third anniversary of the effective date of the joint plan

'

'

'

'

'

'

'

'

'

'

'

'

'

30,000,000

'

'

'

'

'

'

'

'

'

'

'

Maximum number of deferred payments by the entity to the Trust

'

'

'

'

'

'

'

'

'

'

10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

ZAI Property Damage, Qualified Claimed Amount, Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

55.00%

'

'

'

'

'

'

'

'

Maximum Resolved Amount, Per Claim

'

'

'

'

'

'

'

'

'

'

'

4,125

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Payment Obligation Per Year for Five Years

110,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Payment Obligation Per Year for Ten Years

100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Asbestos-related insurance

0

'

0

'

'

500,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000,000

'

'

'

Period of Warrant Settlement after Effective Date of Joint Plan

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Duration After Effective Date in Which Claims Payments Were Made

'

'

'10 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Shares Issuable under Warrant

10,000,000

'

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise Price of Warrant

170,000,000

'

170,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock Closing Price under Condition 1

$54.50

'

$54.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant Repurchase Price under Condition 1

375,000,000

'

375,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock Closing Price under Condition 2

$66

'

$66

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant Repurchase Price under Condition 2

490,000,000

'

490,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred payments per year for twenty years by the entity to the Trust

'

'

'

'

'

'

'

'

'

'

8,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period in Which ZAI PD Contingent Deferred Payments Will be Made

'

'

'20 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum assets fulfilling condition for payment of contingent obligation by the entity to the Trust

'

'

'

'

'

'

'

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Claims Filings

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Asbestos related settlement in cash

'

'

'

'

42,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Asbestos related settlement in cash and stock

'

'

'

'

856,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Common Stock Shares Held in Trust

'

'

18,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reclassification to current liabilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-10,300,000

[1]

'

'

'

Deferred payment obligations

616,300,000

'

616,300,000

'

594,500,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

PI warrant liability

$490,000,000

'

$490,000,000

'

$490,000,000

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

(1)As of December 31, 2013, $10.3 million of certain pension and postretirement benefit obligations subject to compromise have been presented in "other current liabilities" in the accompanying Consolidated Balance Sheets in accordance with ASC 715 "Compensation—Retirement Benefits."

Chapter_11_Information_Details1

Chapter 11 Information (Details 2) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2011

Chapter 11 Filing Entities

Chapter 11 Filing Entities

Chapter 11 Filing Entities

Chapter 11 Filing Entities

Chapter 11 Filing Entities

Chapter 11 Filing Entities

Chapter 11 information

'

'

'

'

'

'

'

'

'

'

'

'

Payment to Settle Certain Liabilities Subject to Compromise

'

'

$1,340.60

'

'

'

'

'

'

'

'

'

Default Interest Settlement on Prepetition Debt

0

'

0

'

129

'

'

'

'

'

'

'

Components of liabilities subject to compromise are as follows:

'

'

'

'

'

'

'

'

'

'

'

'

Asbestos-related contingencies

'

'

'

'

2,092.40

'

'

'

'

'

2,092.40

'

Pre-petition bank debt plus accrued interest

0

'

0

'

1,137.80

'

'

'

'

'

1,100

'

Environmental contingencies

'

'

'

'

'

'

'

'

'

'

134.5

'

Unfunded special pension arrangements

'

'

'

'

'

'

'

'

'

'

129.4

'

Income tax contingencies

'

'

'

'

'

'

'

'

'

'

76.6

'

Postretirement benefits other than pension

'

'

'

'

'

'

'

'

'

'

57.2

'

Liabilities Subject to Compromise, Drawn Letters of Credit and Accrued Interest

'

'

'

'

'

'

'

'

'

'

37.8

'

Accounts payable

'

'

'

'

'

'

'

'

'

'

34.3

'

Retained obligations of divested businesses

'

'

'

'

'

'

'

'

'

'

29.9

'

Other accrued liabilities

'

'

'

'

'

'

'

'

'

'

94.3

'

Reclassification to current liabilities

'

'

'

'

'

'

'

'

'

'

-10.3

[1]

'

Liabilities Subject to Compromise

0

'

0

'

'

'

'

'

'

'

'

'

Reconciliation of the changes in pre-filing date liability balances

'

'

'

'

'

'

'

'

'

'

'

'

Balance, Filing Date April 2, 2001

'

'

3,776.10

'

'

'

'

'

3,776.10

'

'

'

Cash disbursements and/or reclassifications under Bankruptcy Court orders:

'

'

'

'

'

'

'

'

'

'

'

'

Payment of environmental settlement liability

'

'

-7

-6.3

'

'

'

'

'

'

'

'

Balance, end of period

0

'

0

'

'

'

'

'

'

'

'

'

Chapter 11 Expenses

'

'

'

'

'

'

'

'

'

'

'

'

Legal and financial advisory fees

'

'

'

'

'

'

3

3.8

9.2

8.8

'

'

Interest income

'

'

'

'

'

'

0

-0.5

-0.1

-0.7

'

'

Chapter 11 expenses, net of interest income

3

3.3

9.1

8.1

'

'

3

3.3

9.1

8.1

'

'

Debtor-in-Possession Statements of Operations

'

'

'

'

'

'

'

'

'

'

'

'

Net sales, including intercompany

838

802.8

1,582.50

1,512.70

'

'

'

'

'

720.3

'

'

Cost of goods sold, including intercompany, exclusive of depreciation and amortization shown separately below

'

'

'

'

'

'

'

'

'

444.1

'

'

Selling, general and administrative expenses

144

142.1

280.8

275.4

'

'

'

'

'

121

'

'

Depreciation and amortization

'

'

68

61.8

'

'

'

'

'

34.6

'

'

Research and development expenses

20.3

16.6

40.8

33.5

'

'

'

'

'

18.8

'

'

Interest expense and related financing costs

11.1

10.9

22.3

21.4

'

'

'

'

'

18.6

'

'

Restructuring expenses

'

'

2.7

'

'

'

'

'

'

'

'

'

Provision for environmental remediation

3.4

1.3

4.6

2.3

'

'

'

'

'

'

'

'

Other income, net

10.9

3.9

20.9

11.8

'

'

'

'

'

-31.5

'

'

Total costs and expenses

191.9

167.6

381

335.9

'

'

'

'

'

613.7

'

'

Income before income taxes and equity in net income of non-filing entities

'

'

'

'

'

'

'

'

'

106.6

'

'

Benefit from (provision for) income taxes

7.7

-42.5

-22.1

-73.8

'

'

'

'

'

-45.3

'

'

Income before equity in net income of non-filing entities

'

'

'

'

'

'

'

'

'

61.3

'

'

Equity in net income of non-filing entities

'

'

'

'

'

'

'

'

'

88.1

'

'

Net income attributable to W. R. Grace and Co. shareholders

136.2

90.3

186.3

149.4

'

'

'

'

'

149.4

'

'

Operating Activities

'

'

'

'

'

'

'

'

'

'

'

'

Net income attributable to W. R. Grace and Co. shareholders

136.2

90.3

186.3

149.4

'

'

'

'

'

149.4

'

'

Reconciliation to net cash (used for) provided by operating activities:

'

'

'

'

'

'

'

'

'

'

'

'

Depreciation and amortization

'

'

68

61.8

'

'

'

'

'

34.6

'

'

Equity in net income of non-filing entities

'

'

'

'

'

'

'

'

'

-88.1

'

'

Provision for income taxes

-7.7

42.5

22.1

73.8

'

'

'

'

'

45.3

'

'

Income taxes paid, net of refunds

'

'

-16.4

-26.9

'

'

'

'

'

-3.4

'

'

Pension and Other Postretirement Benefit Expense

'

'

11.5

16.1

'

'

'

'

'

7.4

'

'

Payments under defined benefit pension arrangements

'

'

-89.1

-58

'

'

'

'

'

-52.8

'

'

Changes in assets and liabilities, excluding the effect of foreign currency translation:

'

'

'

'

'

'

'

'

'

'

'

'

Trade accounts receivable

'

'

-57.4

-3.3

'

'

'

'

'

-10.3

'

'

Inventories

'

'

-39.8

-37

'

'

'

'

'

-29.8

'

'

Accounts payable

'

'

20.3

37.1

'

'

'

'

'

16.8

'

'

All other items, net

'

'

1.7

-45.1

'

'

'

'

'

14.4

'

'

Net cash provided by (used for) operating activities

'

'

'

'

'

'

'

'

'

83.5

'

'

Investing Activities

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures

'

'

-81.5

-73.7

'

'

'

'

'

-39.9

'

'

Payments for (Proceeds from) Short-term Investments

'

'

0

500

'

'

'

'

'

500

'

'

Transfer to restricted cash and cash equivalents

'

'

395.4

29.1

'

'

'

'

'

5.1

'

'

Net cash used for investing activities

'

'

'

'

'

'

'

'

'

-534.8

'

'

Financing activities

'

'

'

'

'

'

'

'

'

'

'

'

Net repayments under credit arrangements

'

'

1,101.10

18.6

'

'

'

'

'

0

'

'

Repayments under credit arrangements

'

'

-662.2

-35.6

'

'

'

'

'

-0.4

'

'

Proceeds from exercise of stock options

'

'

12.5

25.2

'

'

'

'

'

25.2

'

'

Net cash provided by financing activities

'

'

'

'

'

'

'

'

'

24.8

'

'

Net decrease in cash and cash equivalents

'

'

'

'

'

'

'

'

'

-426.5

'

'

Cash and cash equivalents, beginning of period

'

'

964.8

1,336.90

'

'

'

'

585.1

'

'

1,064.20

Cash and cash equivalents, end of period

283.9

942.4

283.9

942.4

'

'

'

637.7

'

637.7

'

1,064.20

Current Assets

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

283.9

942.4

283.9

942.4

'

'

'

637.7

'

637.7

'

1,064.20

Restricted cash and cash equivalents

0

'

0

'

395.4

'

'

'

'

'

340.5

'

Trade accounts receivable, net

539.9

'

539.9

'

481.8

'

'

'

'

'

149.7

'

Receivables from non-filing entities, net

'

'

'

'

'

'

'

'

'

'

173

'

Inventories

334.6

'

334.6

'

295.3

'

'

'

'

'

138.9

'

Other current assets

92.3

'

92.3

'

99

'

'

'

'

'

69.3

'

Total Current Assets

1,466

'

1,466

'

2,294.40

'

'

'

'

'

1,456.50

'

Properties and equipment, net

835.2

'

835.2

'

829.9

'

'

'

'

'

484.5

'

Goodwill

467.7

'

467.7

'

457.5

'

'

'

'

'

279.9

'

Technology and other intangible assets, net

305.2

'

305.2

'

315.5

'

'

'

'

'

249.1

'

Deferred income taxes

619.9

'

619.9

'

845.9

'

'

'

'

'

817.3

'

Asbestos-related insurance

0

'

0

'

500

'

'

'

'

'

500

'

Loans receivable from non-filing entities, net

'

'

'

'

'

'

'

'

'

'

283.8

'

Investment in non-filing entities

'

'

'

'

'

'

'

'

'

'

531.3

'

Investment in unconsolidated affiliate

102.7

'

102.7

'

96.2

'

'

'

'

'

96.2

'

Other assets

61.4

'

61.4

'

40

'

'

'

'

'

16.5

'

Total Assets

3,903.80

'

3,903.80

'

5,396.10

'

'

'

'

'

4,715.10

'

Liabilities Not Subject to Compromise

'

'

'

'

'

'

'

'

'

'

'

'

Current liabilities

1,279.40

'

1,279.40

'

635.6

'

'

'

'

'

247.4

'

Underfunded defined benefit pension plans

'

'

'

'

'

'

'

'

'

'

52.2

'

Other liabilities

140.7

'

140.7

'

60.8

'

'

'

'

'

78.7

'

Total Liabilities Not Subject to Compromise

3,333

'

3,333

'

1,048.80

'

'

'

'

'

378.3

'

Liabilities Subject to Compromise

0

'

0

'

'

'

'

'

'

'

'

'

Total Liabilities

3,333

'

3,333

'

4,824.90

'

'

'

'

'

4,154.40

'

Total W. R. Grace & Co. Shareholders' Equity

559.4

'

559.4

'

560.6

'

'

'

'

'

560.6

'

Noncontrolling interests in Chapter 11 filing entities

11.4

'

11.4

'

10.6

'

'

'

'

'

0.1

'

Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest

570.8

483

570.8

483

571.2

319.8

'

'

'

'

560.7

'

Total Liabilities and Equity

3,903.80

'

3,903.80

'

5,396.10

'

'

'

'

'

4,715.10

'

Interest accrued on pre-petition liabilities subject to compromise

'

'

$3.40

$18.40

'

'

'

'

'

'

'

'

[1]

(1)As of December 31, 2013, $10.3 million of certain pension and postretirement benefit obligations subject to compromise have been presented in "other current liabilities" in the accompanying Consolidated Balance Sheets in accordance with ASC 715 "Compensation—Retirement Benefits."

Inventories_Details

Inventories (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Raw materials	$90.60	$69.70
In process	48.9	41.8
Finished products	162.7	152.4
Other	32.4	31.4
Total inventories	$334.60	$295.30

Debt_Details

Debt (Details)

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

USD ($)

USD ($)

Delayed Draw Term Loan B [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Term Loan B (EUR) [Member]

Term Loan B (EUR) [Member]

Term Loan B (EUR) [Member]

Term Loan B (USD) [Member]

Term Loan B (USD) [Member]

Other Debt Obligations [Member]

Other Debt Obligations [Member]

EUR (€)

USD ($)

EUR (€)

USD ($)

USD ($)

EUR (€)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Unamortized Discount

'

'

'

'

'

'

$0.50

'

$0

$2.20

$0

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

2.25%

1.75%

1.75%

'

2.50%

2.50%

'

2.25%

'

'

'

Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum

'

'

0.75%

'

'

'

0.75%

0.75%

'

0.75%

'

'

'

Notes Payable, Related Parties

30.1

28.8

'

'

'

'

'

'

'

'

'

'

'

Debt, Long-term and Short-term, Combined Amount

1,073.40

110.7

'

50

'

0

203.2

'

0

696

0

94.1

81.9

Weighted average interest rates on total debt (as a percent)

3.30%

3.60%

'

'

'

'

'

'

'

'

'

'

'

Debt payable within one year

-157.4

-81.1

'

'

'

'

'

'

'

'

'

'

'

Debt payable after one year

916

29.6

'

'

'

'

'

'

'

'

'

'

'

Senior Secured Credit Facility to Fund Emergence

'

'

250

'

400

'

'

150

'

700

'

'

'

Length of Delayed Draw Term Loan Facility

'

'

'12 months

'

'

'

'

'

'

'

'

'

'

Term Loans Percent of Original Principal, Annual Amortization

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

Debt Subject to Compromise

'

'

'

'

'

'

'

'

'

'

'

'

'

Bank borrowings

0

500

'

'

'

'

'

'

'

'

'

'

'

Accrued interest on bank borrowings

0

471

'

'

'

'

'

'

'

'

'

'

'

Default Interest Settlement on Prepetition Debt

0

129

'

'

'

'

'

'

'

'

'

'

'

Drawn letters of credit

0

26.7

'

'

'

'

'

'

'

'

'

'

'

Accrued interest on drawn letters of credit

0

11.1

'

'

'

'

'

'

'

'

'

'

'

Debt Subject to Compromise

$0

$1,137.80

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_Measurements_and_Ri2

Fair Value Measurements and Risk (Details) (USD $)

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

In Millions, unless otherwise specified

country

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Fixed-rate natural gas swaps

Commodity Option [Member]

Fixed-rate aluminum swaps

Total

Total

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Significant Other Observable Inputs (Level 2)

Significant Other Observable Inputs (Level 2)

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

MMBTU

lb

Items measured at Fair Value on a Recurring Basis

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum period of cash flow hedging

'

'

'

'

'

'

'

'

'

'

'12 months

'24 months

'12 months

Nonmonetary Notional Amount of Price Risk Cash Flow Hedge Derivatives, Number of Units

'

'

'

'

'

'

'

'

'

'

'

4,500,000

1,500,000

Derivative, Notional Amount

'

'

'

'

'

'

'

'

'

'

'

'

$1.20

Number of countries where company does business, greater than

40

50

'

'

'

'

'

'

'

'

'

'

'

Assets

'

'

'

'

'

'

'

'

'

'

'

'

'

Currency derivatives, assets

'

'

2.2

2.1

0

0

2.2

2.1

0

0

'

'

'

Commodity derivatives, assets

'

'

0.1

'

0

'

0.1

'

0

'

'

'

'

Total Assets

'

'

2.3

2.1

0

0

2.3

2.1

0

0

'

'

'

Liabilities

'

'

'

'

'

'

'

'

'

'

'

'

'

Currency derivatives, liabilities

'

'

0.2

6.9

0

0

0.2

6.9

0

0

'

'

'

Interest Rate Derivative Liabilities, at Fair Value

'

'

2.8

'

0

'

2.8

'

0

'

'

'

'

Commodity derivatives, liabilities

'

'

'

0.1

'

0

'

0.1

'

0

'

'

'

Total Liabilities

'

'

$3

$7

$0

$0

$3

$7

$0

$0

'

'

'

Fair_Value_Measurements_and_Ri3

Fair Value Measurements and Risk (Details 2) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair values of derivative instruments	'	'
Derivative, Fixed Interest Rate	4.64%	'
Asset Derivatives	$2.30	$2.10
Liability Derivatives	3	7
Derivatives designated as hedging instruments under ASC 815 | Other current assets	'	'
Fair values of derivative instruments	'	'
Asset Derivatives, Commodity contracts	0.1	0
Asset Derivatives, Currency contracts	1	1
Interest Rate Fair Value Hedge Asset at Fair Value	0	'
Derivatives designated as hedging instruments under ASC 815 | Other current liabilities	'	'
Fair values of derivative instruments	'	'
Liability Derivatives, Commodity contracts	0	0.1
Liability Derivatives, Currency contracts	0	0
Interest Rate Fair Value Hedge Asset at Fair Value	1	'
Derivatives designated as hedging instruments under ASC 815 | Other Assets [Member]	'	'
Fair values of derivative instruments	'	'
Asset Derivatives, Currency contracts	0.9	1
Interest Rate Fair Value Hedge Asset at Fair Value	0	'
Derivatives designated as hedging instruments under ASC 815 | Other Liabilities [Member]	'	'
Fair values of derivative instruments	'	'
Asset Derivatives, Currency contracts	'	0
Liability Derivatives, Currency contracts	0	'
Interest Rate Fair Value Hedge Asset at Fair Value	1.8	'
Derivatives not designated as hedging instruments under ASC 815 | Other current assets	'	'
Fair values of derivative instruments	'	'
Asset Derivatives, Currency contracts	0.3	0.1
Derivatives not designated as hedging instruments under ASC 815 | Other current liabilities	'	'
Fair values of derivative instruments	'	'
Liability Derivatives, Currency contracts	0.2	6.9
Derivatives not designated as hedging instruments under ASC 815 | Other Assets [Member]	'	'
Fair values of derivative instruments	'	'
Asset Derivatives, Currency contracts	0	'
Derivatives not designated as hedging instruments under ASC 815 | Other Liabilities [Member]	'	'
Fair values of derivative instruments	'	'
Liability Derivatives, Currency contracts	0	'
Interest Rate Swap [Member]	'	'
Fair values of derivative instruments	'	'
Derivative, Notional Amount	$250	'

Fair_Value_Measurements_and_Ri4

Fair Value Measurements and Risk (Details 3)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Derivatives in ASC 815 cash flow hedging relationships

Derivatives in ASC 815 cash flow hedging relationships

Derivatives in ASC 815 cash flow hedging relationships

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Derivatives in ASC 815 cash flow hedging relationships

Derivatives in ASC 815 cash flow hedging relationships

Term Loan B (EUR) [Member]

USD ($)

USD ($)

USD ($)

USD ($)

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Currency contracts

Currency contracts

Currency contracts

Currency contracts

Currency contracts

Currency contracts

Commodity contracts

Commodity contracts

Commodity contracts

Commodity contracts

USD ($)

USD ($)

EUR (€)

Currency contracts

Currency contracts

Currency contracts

Currency contracts

USD ($)

USD ($)

EUR (€)

Other income (expense)

Other income (expense)

Cost of goods sold

Cost of goods sold

Other income (expense)

Other income (expense)

Other income (expense)

Other income (expense)

Cost of goods sold

Cost of goods sold

Cost of goods sold

Cost of goods sold

Other income (expense)

Other income (expense)

Other income (expense)

Other income (expense)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Gains and losses on derivative instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

($4.50)

$0

($2.60)

$0.20

($3.90)

($2.90)

$0

($0.20)

($0.60)

$1

($0.10)

$0.70

$0

($1)

$0.40

($0.30)

'

'

'

'

'

'

'

'

'

'

Senior Secured Credit Facility to Fund Emergence

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

130

'

'

'

'

'

'

150

Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.8

1.8

'

'

'

'

'

1.8

1.8

'

Nonderivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Ineffective Portion, Net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

0

0

'

Gain (loss) from hedging activities

-0.8

1.3

0

0.9

0

0

-0.2

-0.1

-0.7

1

-0.2

0.8

-0.1

0.5

0.2

0.2

'

'

'

'

'

'

'

'

'

'

Amount of Gain or (Loss) Recognized in Income on Derivative

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.30

($3.60)

$4.80

$4.10

'

'

'

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Net Deferred Tax Assets by Country [Line Items]	'	'	'
Deferred income taxes	$619.90	$619.90	$845.90
Deferred Tax Assets, Net	821.8	821.8	'
Material change to aggregate recorded liabilities for uncertain tax positions in the next twelve months	'	'	'
Effective Income Tax Rate Reconciliation, Percent	25.30%	'	28.50%
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Other Information	'	'12 months	'
Net Operating Losses From Emergence	'	670	'
US Federal Income Tax Deduction Upon Settlement of Warrant Held by Asbestos Trusts	490	490	'
Period Allowed for Carryforward of Operating Loss	'	'20 years	'
Taxable Income Required to Realize DTA, Per Year	'	100	'
Examination issues and settlements with U.S. federal, state, and foreign tax authorities	'	'	'
Material change to aggregate recorded liabilities for uncertain tax positions in the next twelve months	'	'	'
Decrease in unrecognized tax benefits during the next 12 months	4	4	'
Federal Jurisdiction [Member]	'	'	'
Net Deferred Tax Assets by Country [Line Items]	'	'	'
Deferred Tax Assets, Net	727.3	727.3	'
Taxable Income Required to Realize DTA, Total	'	2,080	'
State and Local Jurisdiction [Member]	'	'	'
Net Deferred Tax Assets by Country [Line Items]	'	'	'
Deferred Tax Assets, Net	$60.60	$60.60	'

Income_Taxes_Income_Taxes_Deta

Income Taxes Income Taxes (Details 2) (USD $)	Jun. 30, 2014	Feb. 03, 2014
In Millions, unless otherwise specified
Net Deferred Tax Assets by Country [Line Items]	'	'
Cash Payment to PI Trust	$632	'
Present Value of DPO	'	616
Deferred Tax Assets, Net of Deferred Tax Liabilities	834.2	'
Deferred Tax Assets, Valuation Allowance	-12.4	'
Deferred Tax Assets, Net	821.8	'
US Federal Income Tax Deductions Generated at Emergence	670	'
US Federal Income Tax Deduction Upon Settlement of Warrant Held by Asbestos Trusts	490	'
Income Tax Contingency Netted Against Related DTA	4.8	'
Federal Jurisdiction [Member]	'	'
Net Deferred Tax Assets by Country [Line Items]	'	'
Deferred Tax Assets, Net of Deferred Tax Liabilities	729.4	'
Deferred Tax Assets, Valuation Allowance	-2.1	'
Deferred Tax Assets, Net	727.3	'
State and Local Jurisdiction [Member]	'	'
Net Deferred Tax Assets by Country [Line Items]	'	'
Deferred Tax Assets, Net of Deferred Tax Liabilities	70.6	'
Deferred Tax Assets, Valuation Allowance	-10	'
Deferred Tax Assets, Net	60.6	'
GERMANY	'	'
Net Deferred Tax Assets by Country [Line Items]	'	'
Deferred Tax Assets, Net of Deferred Tax Liabilities	26.4	'
Deferred Tax Assets, Valuation Allowance	0	'
Deferred Tax Assets, Net	26.4	'
Foreign Tax Authority [Member]	'	'
Net Deferred Tax Assets by Country [Line Items]	'	'
Deferred Tax Assets, Net of Deferred Tax Liabilities	7.8	'
Deferred Tax Assets, Valuation Allowance	-0.3	'
Deferred Tax Assets, Net	$7.50	'

Income_Taxes_Income_Taxes_Deta1

Income Taxes Income Taxes (Details 3) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
Operating Loss Carryforwards [Line Items]	'
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	$59.60
Federal Jurisdiction [Member]	'
Operating Loss Carryforwards [Line Items]	'
Taxable Income Required to Realize DTA, Total	$2,080

Pension_Plans_and_Other_Postre2

Pension Plans and Other Postretirement Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Funded status of fully funded, underfunded, and unfunded pension plans:	'	'	'	'	'
Overfunded defined benefit pension plans	$45.70	'	$45.70	'	$16.70
Total underfunded and unfunded defined benefit pension plans	-343.1	'	-343.1	'	-299.6
Pension liabilities included in other current liabilities	-358.8	'	-358.8	'	'
Postretirement Benefits Other Than Pensions	'	'	'	'	'
Other Comprehensive Income, Effect of Postretirement Plan Changes, Pre-tax, Net	41.9	'	41.9	'	'
Effect of Postretirement Plan Changes, Amortize Amount from OCI	39.5	'	'	'	'
Effect of Postretirement Plan Changes, Amortization Period	'5 months	'	'	'	'
Gain on termination of postretirement plans	7.9	0	7.9	0	'
Pension Plans	'	'	'	'	'
Funded status of fully funded, underfunded, and unfunded pension plans:	'	'	'	'	'
Unfunded defined benefit pension plans included in liabilities subject to compromise	0	'	0	'	-123.6
Pension liabilities included in other current liabilities	-15.7	'	-15.7	'	-15
Net funded status	-313.1	'	-313.1	'	-421.5
U.S. qualified pension plans	'	'	'	'	'
Funded status of fully funded, underfunded, and unfunded pension plans:	'	'	'	'	'
Defined benefit pension plans, discount rate (as a percent)	4.43%	'	4.43%	'	'
Postretirement Benefits Other Than Pensions	'	'	'	'	'
Gain on termination of postretirement plans	0	0	'	0	'
Non-U.S. pension plans	'	'	'	'	'
Postretirement Benefits Other Than Pensions	'	'	'	'	'
Gain on termination of postretirement plans	0	0	0	0	'
Postretirement Benefits Other Than Pensions	'	'	'	'	'
Postretirement Benefits Other Than Pensions	'	'	'	'	'
Minimum eligible age for medical plan benefits	'55 years	'	'	'	'
Minimum eligible tenure of service for medical plan benefits	'10 years	'	'	'	'
Gain on termination of postretirement plans	7.9	0	7.9	0	'
Overfunded pension plans | Pension Plans	'	'	'	'	'
Funded status of fully funded, underfunded, and unfunded pension plans:	'	'	'	'	'
Overfunded defined benefit pension plans	45.7	'	45.7	'	16.7
Underfunded and Unfunded pension plans | Pension Plans	'	'	'	'	'
Funded status of fully funded, underfunded, and unfunded pension plans:	'	'	'	'	'
Total underfunded and unfunded defined benefit pension plans	-343.1	'	-343.1	'	-299.6
Underfunded pension plans | Pension Plans	'	'	'	'	'
Funded status of fully funded, underfunded, and unfunded pension plans:	'	'	'	'	'
Total underfunded and unfunded defined benefit pension plans	-18.8	'	-18.8	'	-66.2
Unfunded pension plans | Pension Plans	'	'	'	'	'
Funded status of fully funded, underfunded, and unfunded pension plans:	'	'	'	'	'
Total underfunded and unfunded defined benefit pension plans	($324.30)	'	($324.30)	'	($233.40)

Pension_Plans_and_Other_Postre3

Pension Plans and Other Postretirement Benefit Plans (Details 2) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension plans and other postretirement benefit plans	'	'	'	'
Defined Benefit Plan, Measurement Date	'	'	'	'March 1, 2014
Percent of Net Actuarial Gains and Losses Over Accumulated Postretirement Benefit Obligation Recognized in Statement of Operations	'	'	10.00%	'
Net Periodic Benefit Cost	'	'	'	'
Amortization of prior service cost	'	$0	'	$0
Defined Benefit Pension Mark to Market Adjustment	0	0	-4.8	2.5
Gain on termination of postretirement plans	-7.9	0	-7.9	0
Defined Benefit Plan, Contributions by Employer	'	'	'	75
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	3.3	3.4	6.6	6.7
U.S. qualified pension plans	'	'	'	'
Pension plans and other postretirement benefit plans	'	'	'	'
Benefit Payments from Nonqualified Plans Related to Emergence	27	'	27	'
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.43%	'	4.43%	'
Net Periodic Benefit Cost	'	'	'	'
Service cost	5.9	6.3	11.8	12.6
Interest cost	14.9	13.1	30.1	26
Expected return on plan assets	-17.5	-17	-35	-34
Amortization of prior service cost	0.2	0.2	0.4	0.4
Amortization of net deferred actuarial loss	0	0	0	0
Defined Benefit Pension Mark to Market Adjustment	0	0	-3.1	0
Gain on termination of postretirement plans	0	0	'	0
Net periodic benefit cost	3.5	2.6	4.2	5
Non-U.S. pension plans	'	'	'	'
Net Periodic Benefit Cost	'	'	'	'
Service cost	2.8	2.7	5.5	5.4
Interest cost	5.6	5.1	11.3	10.2
Expected return on plan assets	-3.9	-3.5	-7.8	-7
Amortization of prior service cost	0	'	0	'
Amortization of net deferred actuarial loss	0	0	0	0
Defined Benefit Pension Mark to Market Adjustment	0	0	0	0
Gain on termination of postretirement plans	0	0	0	0
Net periodic benefit cost	4.5	4.3	9	8.6
Postretirement Benefits Other Than Pensions	'	'	'	'
Net Periodic Benefit Cost	'	'	'	'
Service cost	0.1	0	0.1	0.1
Interest cost	0.3	0.6	0.9	1.1
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	-0.4	0	-0.5	0
Amortization of net deferred actuarial loss	-0.1	0.1	-0.3	0.2
Defined Benefit Pension Mark to Market Adjustment	0	0	0	0
Gain on termination of postretirement plans	-7.9	0	-7.9	0
Net periodic benefit cost	($8)	$0.70	($7.70)	$1.40

Other_Balance_Sheet_Accounts_D

Other Balance Sheet Accounts (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Other Current Liabilities	'	'
Accrued compensation	$57.40	$62.40
Income tax payable	32.6	32
Customer volume rebates	32.3	33.3
Environmental contingencies	21.3	1.3
Deferred revenue	15.8	14.3
Pension liabilities	15.7	15
Deferred tax liability	0.1	0.1
Other accrued liabilities	145.3	133.6
Total Other Current Liabilities	$320.50	$292

Commitments_and_Contingent_Lia1

Commitments and Contingent Liabilities (Details) (USD $)	6 Months Ended					6 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Feb. 03, 2014	Dec. 31, 2013	Mar. 31, 2011	Jun. 30, 2014	Dec. 31, 2010	Dec. 31, 2013	Jun. 30, 2014	Dec. 31, 2013
						Vermiculite Related Matters	Vermiculite Related Matters	Vermiculite Related Matters	Non-Vermiculite Related Matters	Non-Vermiculite Related Matters
						facility	facility
Environmental remediation	'	'	'	'	'	'	'	'	'	'
Estimated liability for environmental investigative and remediation costs	$58.60	'	'	$135.90	$16	$15.80	'	$60.40	$42.80	$75.50
Environmental Claim Payments	'	'	75.9	'	'	'	'	'	'	'
Net cash expenditures	$7	$6.30	'	'	'	'	'	'	'	'
Maximum number of operating plants under U.S. Environmental Protection Agency (EPA) reinvestigation	'	'	'	'	'	'	105	'	'	'
Number of facilities expanded	'	'	'	'	'	8	'	'	'	'

Commitments_and_Contingent_Lia2

Commitments and Contingent Liabilities (Details 2) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
Financial Guarantee	'
Financial assurances	'
Gross financial assurances issued and outstanding	$145.80
Surety Bonds	'
Financial assurances	'
Gross financial assurances issued and outstanding	39.2
Standby Letters of Credit	'
Financial assurances	'
Gross financial assurances issued and outstanding	$106.60

Restructuring_Expenses_and_Rel2

Restructuring Expenses and Related Asset Impairments (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Restructuring expenses and related asset impairments	'	'	'	'
Severance Costs	$2	$4.20	$2.70	$5
Impairment of Long-Lived Assets to be Disposed of	9.7	0.1	9.7	0.1
Total restructuring expenses and related asset impairments	11.7	4.3	12.4	5.1
Restructuring Liability	'	'	'	'
Balance at beginning of the period	'	'	4.4	'
Accruals for severance and other costs	'	'	2.7	'
Payments	'	'	-3.4	'
Balance at end of the period	3.7	'	3.7	'
Grace Catalysts Technologies [Member]	'	'	'	'
Restructuring expenses and related asset impairments	'	'	'	'
Severance Costs	0.2	'	'	'
Grace Construction Products	'	'	'	'
Restructuring expenses and related asset impairments	'	'	'	'
Severance Costs	0.5	'	'	'
Corporate, Non-Segment [Member]	'	'	'	'
Restructuring expenses and related asset impairments	'	'	'	'
Severance Costs	$1.30	'	'	'

Other_Income_Expense_net_Detai

Other (Income) Expense, net (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Income and Expenses [Abstract]	'	'	'	'
Total restructuring expenses and related asset impairments	$11.70	$4.30	$12.40	$5.10
Environmental Remediation Expense	3.4	1.3	4.6	2.3
Asbestos and bankruptcy related charges, net	-2.4	0	6.4	0
Interest Income, Other	0.5	0.1	1	0.3
Other currency transaction effects	0.4	1.2	0.7	0.8
Gain (Loss) on Sales of Investments and Disposals of Assets Net	0	1.2	-0.7	1.1
Currency transaction loss in Venezuela	0	0	'	8.5
Other Miscellaneous Nonoperating (Income) Expense	1.7	1.6	2.9	3.5
Total other (income) expense, net	$10.90	$3.90	$20.90	$11.80

Other_Comprehensive_Income_Det

Other Comprehensive Income (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Equity [Abstract]	'	'	'	'
Other Comprehensive Income, Effect of Postretirement Plan Changes, Pre-tax, Net	$41.90	'	$41.90	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Tax Effect	-14.7	'	-14.7	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net of Tax	27.2	'	27.2	'
Gain on termination of postretirement plans	-7.9	'	-7.9	'
Other Comprehensive Income, Gain on termination of postretirement plans, Tax	2.8	'	2.8	'
Other Comprehensive Income, Gain on termination of postretirement plans, Net of Tax	-5.1	'	-5.1	'
Defined benefit pension and other postretirement plans, Pre-Tax Amount	'	'	'	'
Amortization of net prior service cost included in net periodic benefit cost, Pre-Tax Amount	-0.2	0.2	-0.1	0.4
Amortization of net deferred actuarial loss included in net periodic benefit cost, Pre-Tax Amount	-0.1	0.1	-0.3	0.2
Benefit plans, net, Pre-Tax Amount	33.7	4.7	33.6	5
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent	7.3	-16.9	5.2	-23.3
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent	-3.7	-1.3	-2.6	-0.7
Other comprehensive income attributable to W. R. Grace and Co. shareholders, Pre-Tax Amount	36.4	-13.5	35.4	-19
Defined benefit pension and other postretirement plans, Tax Benefit/(Expense)	'	'	'	'
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Tax	0	0	0	-0.1
Other Comprehensive Income, Amortization of Defined Benefit Plan, Net Deferred Actuarial Gain (Loss), Recognized in Net Periodic Benefit Cost Tax Effect	-0.1	0	-0.1	-0.1
Benefit plans, net, Tax Benefit/(Expense)	-11.8	-1.6	-11.8	-1.8
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent	1.3	0.5	0.9	0.3
Other comprehensive income attributable to W. R. Grace and Co. shareholders, Tax Benefit/(Expense)	-10.2	-1.1	-10.6	-1.5
Defined benefit pension and other postretirement plans, After-Tax Amount:	'	'	'	'
Amortization of net prior service credit included in net periodic benefit cost, After-Tax Amount	-0.2	0.2	-0.1	0.3
Amortization of net deferred actuarial loss included in net periodic benefit cost, After-Tax Amount	0	0.1	-0.2	0.1
Other Comprehensive Income, Defined Benefit Plan, Other Changes in Funded Status Recognized in Net Periodic Benefit Cost Net of Tax	'	2.8	27.2	2.8
Benefit plans, net, After-Tax Amount	21.9	3.1	21.8	3.2
Currency translation adjustments, After-Tax Amount	7.3	-16.9	5.2	-23.3
Gain (loss) from hedging activities, net of income taxes	-2.4	-0.8	-1.7	-0.4
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	-0.6	0	-0.5	0
Other comprehensive income attributable to W. R. Grace & Co. shareholders, After-Tax Amount	26.2	-14.6	24.8	-20.5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	-0.9	'	-0.8	'
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	0.3	'	0.3	'
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	-0.6	'	-0.5	'
Other Comprehensive Income, Defined Benefit Plan, Other Changes in Funded Status Recognized in Net Periodic Benefit Cost, before Tax	'	4.4	'	'
Other Comprehensive Income, Defined Benefit Plan, Other Changes in Funded Status Recognized in Net Periodic Benefit Cost Tax Effect	'	$1.60	'	'

Other_Comprehensive_Income_Det1

Other Comprehensive Income (Details 2) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	country		country
Reclassification out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax	($0.20)	$0.20	($0.10)	$0.30
Defined benefit pension and other postretirement plans:	'	'	'	'
Amortization of net prior service cost	-0.2	0.2	-0.1	0.4
Amortization of net deferred actuarial loss	0.1	-0.1	0.3	-0.2
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	$21.90	$3.10	$21.80	$3.20
Number of countries in which the entity has operations	40	'	40	'

Other_Comprehensive_Income_Oth

Other Comprehensive Income Other Comprehensive Income (Details 3) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Equity [Abstract]	'	'	'	'	'
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax	($0.20)	$0.20	($0.10)	$0.30	'
Other Comprehensive Income, Gain on termination of postretirement plans, Net of Tax	-5.1	'	-5.1	'	'
Other Comprehensive Income, Amortization of Defined Benefit Plan, Net Deferred Actuarial Gain (Loss) Recognized in Net Periodic Benefit Cost Net of Tax	0	0.1	-0.2	0.1	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net of Tax	27.2	'	27.2	'	'
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	-0.4	'	-0.4	'	0.1
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	-0.6	0	-0.5	0	'
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]	'	'	'	'	'
Beginning, Defined Benefit Pension and Other Postretirement Plans	'	'	6.6	2	'
Beginning, Currency Translation Adjustments	'	'	5.2	28.8	'
Beginning, Gains and Losses from Hedging Activities	'	'	-0.5	-0.3	'
Beginning, Unrealized Loss on Investment	'	'	-0.8	-0.8	'
Beginning, Total	'	'	10.6	29.7	'
Other Comprehensive Income, Defined Benefit Plan, Other Changes in Funded Status Recognized in Net Periodic Benefit Cost Net of Tax	'	2.8	27.2	2.8	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	'	'	5.2	-23.3	'
Currency translation adjustments, After-Tax Amount	7.3	-16.9	5.2	-23.3	'
Other comprehensive income (loss) before reclassifications, Gains and Losses from Hedging Activities	'	'	-1.7	0.3	'
Other Comprehensive Income Loss before Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax	'	'	-0.5	'	'
Other comprehensive income (loss) before reclassifications, Total	'	'	30.2	-20.2	'
Amounts reclassified from accumulated other comprehensive loss, Defined Benefit Pension and Other Postretirement Plans	'	'	-5.4	0.4	'
Amounts reclassified from accumulated other comprehensive loss, Total	'	'	-5.4	-0.3	'
Reclassification From Accumulated Other Comprehensive Income, Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Current Period Net Of Tax	'	'	0	-0.7	'
Benefit plans, net, After-Tax Amount	21.9	3.1	21.8	3.2	'
Gain (loss) from hedging activities, net of income taxes	-2.4	-0.8	-1.7	-0.4	'
Other comprehensive income attributable to W. R. Grace & Co. shareholders, After-Tax Amount	26.2	-14.6	24.8	-20.5	'
Ending, Defined Benefit Pension and Other Postretirement Plans	-28.4	-5.2	-28.4	-5.2	'
Ending, Currency Translation Adjustments	10.4	5.5	10.4	5.5	'
Ending, Gains and Losses from Hedging Activities	-2.2	-0.7	-2.2	-0.7	'
Ending, Unrealized Loss on Investment	-0.8	-0.8	-0.8	-0.8	'
Ending, Total	$35.40	$9.20	$35.40	$9.20	'

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	300,000	300,000	100,000	200,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	500,000,000	'	500,000,000	'
Stock Repurchased During Period, Shares	'	'	2,437,294	'
Numerators	'	'	'	'
Net income attributable to W. R. Grace and Co. shareholders	$136.20	$90.30	$186.30	$149.40
Denominators	'	'	'	'
Weighted average common shares-basic calculation	75,900,000	76,300,000	76,500,000	76,000,000
Dilutive effect of employee stock options (in shares)	900,000	1,300,000	1,000,000	1,400,000
Weighted average common shares-diluted calculation	76,800,000	77,600,000	77,500,000	77,400,000
Earnings Per Share, Basic	$1.79	$1.18	$2.44	$1.97
Earnings Per Share, Diluted	$1.77	$1.16	$2.40	$1.93
Number of warrants not included in diluted earnings per share	10,000,000	'	10,000,000	'
Minimum [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Stock Repurchase Program, Period in Force	'	'	'12 months	'
Maximum [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Stock Repurchase Program, Period in Force	'	'	'24 months	'

Operating_Segment_Information_1

Operating Segment Information (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	segment
Segment Reporting [Abstract]	'	'	'	'
Number of operating segments	3	'	'	'
Net Sales	'	'	'	'
Net sales	$838	$802.80	$1,582.50	$1,512.70
Adjusted EBIT	'	'	'	'
Gain on termination of postretirement plans related to current businesses	4.7	0	4.7	0
Grace Adjusted EBIT	166.1	153.3	277.4	270.1
Reconciliation of operating segment data to financial statements	'	'	'	'
Grace Adjusted EBIT	166.1	153.3	277.4	270.1
Costs related to Chapter 11	-3	-3.3	-9.3	-7.1
Asbestos-related costs	-4.3	-2.1	-5.8	-4.2
Asbestos and bankruptcy related charges, net	2.4	0	-6.4	0
Pension MTM adjustment and other related costs, net	0	0	4.8	-2.5
gain on termination of postretirement plans related to divested businesses	3.2	0	3.2	0
Restructuring expenses and related asset impairments	-11.7	-4.3	-12.4	-5.1
Gain on sale of product line	0.2	0	0.2	0
Divestment Expenses	-0.2	'	-0.2	0
Interest expense and related financing costs	-11.1	-10.9	-22.3	-21.4
Interest accretion on deferred payment obligations	-13.6	0	-21.8	0
Consolidated Exchange Rate Net Charges	'	0	'	-6.9
Investment Income, Interest	0.5	0.1	1	0.3
Currency transaction loss in Venezuela	0	0	'	8.5
Net Income (Loss) Attributable to Noncontrolling Interest, Reconciliation of Operating Segment Data	0.5	0.5	0.7	0.8
Income before income taxes	129	133.3	209.1	224
Segment Reconciling Items [Member]	'	'	'	'
Reconciliation of operating segment data to financial statements	'	'	'	'
Consolidated Exchange Rate Net Charges	'	'	0	'
Currency transaction loss in Venezuela	'	'	'	6.9
Grace Catalysts Technologies [Member]	'	'	'	'
Net Sales	'	'	'	'
Net sales	313.2	290.9	597.7	557.4
Adjusted EBIT	'	'	'	'
Segment operating income	97.5	93.8	168.7	171
Grace Materials Technologies [Member]	'	'	'	'
Net Sales	'	'	'	'
Net sales	236.1	228.7	455.9	443.6
Adjusted EBIT	'	'	'	'
Segment operating income	49.7	44.8	95.2	89.1
Construction Products	'	'	'	'
Net Sales	'	'	'	'
Net sales	288.7	283.2	528.9	511.7
Adjusted EBIT	'	'	'	'
Segment operating income	45	45.3	70.4	68.1
Corporate, Non-Segment [Member]	'	'	'	'
Adjusted EBIT	'	'	'	'
Segment operating income	-22.8	-23.7	-45.3	-44.5
Certain Pension Costs	$8	$6.90	$16.30	$13.60

Operating_Segment_Information_2

Operating Segment Information (Details 2) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Geographic Area Data	'	'	'	'
Net sales	$838	$802.80	$1,582.50	$1,512.70
Total North America	'	'	'	'
Geographic Area Data	'	'	'	'
Net sales	269.6	247.9	508.4	474.6
UNITED STATES	'	'	'	'
Geographic Area Data	'	'	'	'
Net sales	248	230	470.2	441.1
Canada and Puerto Rico	'	'	'	'
Geographic Area Data	'	'	'	'
Net sales	21.6	17.9	38.2	33.5
Europe Middle East Africa	'	'	'	'
Geographic Area Data	'	'	'	'
Net sales	288.7	288.1	558.4	542.5
Asia Pacific	'	'	'	'
Geographic Area Data	'	'	'	'
Net sales	181.9	173.1	336.9	323.7
Latin America	'	'	'	'
Geographic Area Data	'	'	'	'
Net sales	$97.80	$93.70	$178.80	$171.90

Unconsolidated_Affiliate_Detai

Unconsolidated Affiliate (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Investment in unconsolidated affiliates	'	'	'	'	'
Equity method investment, ownership interest (as a percent)	50.00%	'	50.00%	'	'
Investment in unconsolidated affiliate	$102.70	'	$102.70	'	$96.20
Equity in earnings of unconsolidated affiliate	3.1	9.2	6.8	14.3	'
Grace sales of catalysts to ART	64.5	52.1	130	105	'
Charges for fixed costs, research and development and selling, general and administrative services to ART	7.1	7.1	14.6	15.5	'
Commitment fee on credit facility (as a percent)	'	'	0.10%	'	'
Parent Company [Member]	'	'	'	'	'
Investment in unconsolidated affiliates	'	'	'	'	'
Line of credit facility, maximum provided by Grace and Chevron each	15	'	15	'	'
Corporate Joint Venture [Member]	'	'	'	'	'
Investment in unconsolidated affiliates	'	'	'	'	'
Line of credit facility, maximum provided by Grace and Chevron each	$15	'	$15	'	'

Subsequent_Event_Subsequent_Ev1

Subsequent Event Subsequent Event (Details) (USD $)	6 Months Ended
In Millions, except Share data, unless otherwise specified	Jun. 30, 2014
Subsequent Event [Line Items]	'
Five Year Period in Which PI Trust Deferred Payments Will be Made	'5 years
Ten Year Period in Which PI Trust Deferred Payments Will be Made	'10 years
Cash Payment to PI Trust	$632
Accelerated Interest Accretion	30
Personal Injury Trust [Member]	'
Subsequent Event [Line Items]	'
Deferred Payments, Each Year for Five Years	110
Deferred Payments, Each Year for Ten Years	$100
Personal Injury and Personal Damage Trusts [Member]	'
Subsequent Event [Line Items]	'
Common Stock, Shares, Issued	77,372,257