Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies Schedule of Pension Recasting (Tables)

12 Months Ended

Dec. 31, 2013

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

	Year Ended December 31, 2013
(In millions, except per share amounts)	Previous Method			As Reported			Effect of Change
Cost of goods sold	$	1,925.3		$	1,918.6		$	(6.7	)
Gross profit	1,135.4			1,142.1			6.7
Selling, general and administrative expenses	522.2			505.7			(16.5		)
Defined benefit pension expense	73.4			—			(73.4		)
Total costs and expenses	871.4			781.5			(89.9		)
Income (loss) before income taxes	264.0			360.6			96.6
Provision for income taxes	(72.9		)	(102.9		)	(30.0		)
Net income	191.1			257.7			66.6
Net income attributable to W. R. Grace & Co. shareholders	189.5			256.1			66.6
Basic earnings per share
Net income attributable to W. R. Grace & Co. shareholders	2.48			3.35			0.87
Diluted earnings per share
Net income attributable to W. R. Grace & Co. shareholders	2.44			3.30			0.86

	Year Ended December 31, 2012
(In millions, except per share amounts)	Previously Reported		Revised			Effect of Change
Cost of goods sold	$	1,989.2	$	2,041.1		$	51.9
Gross profit	1,166.3		1,114.4			(51.9		)
Selling, general and administrative expenses	537.5		635.2			97.7
Defined benefit pension expense	71.2		—			(71.2		)
Total costs and expenses	1,108.5		1,135.0			26.5
Income (loss) before income taxes	57.8		(20.6		)	(78.4		)
Benefit from income taxes	37.3		61.6			24.3
Net income	95.1		41.0			(54.1		)
Net income attributable to W. R. Grace & Co. shareholders	94.1		40.0			(54.1		)
Basic earnings per share
Net income attributable to W. R. Grace & Co. shareholders	1.26		0.53			(0.72		)
Diluted earnings per share
Net income attributable to W. R. Grace & Co. shareholders	1.23		0.52			(0.71		)

	Year Ended December 31, 2011
(In millions, except per share amounts)	Previously Reported			Revised			Effect of Change
Cost of goods sold	$	2,050.6		$	2,099.0		$	48.4
Gross profit	1,161.3			1,112.9			(48.4		)
Selling, general and administrative expenses	568.4			659.9			91.5
Defined benefit pension expense	63.4			—			(63.4		)
Total costs and expenses	777.8			805.9			28.1
Income before income taxes	383.5			307.0			(76.5		)
Benefit from (provision for) income taxes	(114.7		)	(87.9		)	26.8
Net income	268.8			219.1			(49.7		)
Net income attributable to W. R. Grace & Co. shareholders	269.4			219.7			(49.7		)
Basic earnings per share
Net income attributable to W. R. Grace & Co. shareholders	3.66			2.99			(0.68		)
Diluted earnings per share
Net income attributable to W. R. Grace & Co. shareholders	3.57			2.91			(0.66		)

Consolidated Balance Sheets

	December 31, 2013
(In millions)	Previous Method			As Reported		Effect of Change
Inventories	$	294.7		$	295.3	$	0.6
Total current assets	2,293.8			2,294.4		0.6
Deferred income taxes	846.1			845.9		(0.2		)
Overfunded defined benefit pension plans	16.7			16.7		—
Total assets	5,395.7			5,396.1		0.4
Underfunded and unfunded defined benefit pension plans	299.6			299.6		—
Total Liabilities Not Subject to Compromise	1,048.8			1,048.8		—
Postretirement benefits	176.3			176.3		—
Total Liabilities Subject to Compromise	3,776.1			3,776.1		—
Total Liabilities	4,824.9			4,824.9		—
Accumulated other comprehensive income (loss)	(558.7		)	10.6		569.3
Retained earnings	584.7			15.8		(568.9		)
Total W. R. Grace & Co. Shareholders' Equity	560.2			560.6		0.4
Total Equity	570.8			571.2		0.4

	December 31, 2012
(In millions)	Previously Reported			Revised			Effect of Change
Inventories	$	278.6		$	283.6		$	5.0
Total current assets	2,440.2			2,445.2			5.0
Deferred income taxes	956.3			953.2			(3.1		)
Overfunded defined benefit pension plans	33.8			32.1			(1.7		)
Total assets	5,090.2			5,090.4			0.2
Underfunded and unfunded defined benefit pension plans	400.6			396.5			(4.1		)
Total Liabilities Not Subject to Compromise	1,154.8			1,150.7			(4.1		)
Postretirement benefits	188.1			190.9			2.8
Total Liabilities Subject to Compromise	3,617.1			3,619.9			2.8
Total Liabilities	4,771.9			4,770.6			(1.3		)
Accumulated other comprehensive income (loss)	(607.3		)	29.7			637.0
Retained earnings	395.2			(240.3		)	(635.5		)
Total W. R. Grace & Co. Shareholders' Equity	308.4			309.9			1.5
Total Equity	318.3			319.8			1.5

Consolidated Statements of Cash Flows

	Year Ended December 31, 2013
(In millions)	Previous Method			As Reported			Effect of Change
Cash flows from operating activities:
Net income	$	191.1		$	257.7		$	66.6
(Benefit from) provision for income taxes	72.9			102.9			30.0
Defined benefit pension expense	73.4			(23.2		)	(96.6		)
Inventories	4.2			8.6			4.4
All other items, net(1)	(25.6		)	(30.0		)	(4.4		)

	Year Ended December 31, 2012
(In millions)	Previously Reported			Revised			Effect of Change
Cash flows from operating activities:
Net income	$	95.1		$	41.0		$	(54.1	)
(Benefit from) provision for income taxes	(37.3		)	(61.6		)	(24.3		)
Defined benefit pension expense	71.2			149.6			78.4
Inventories	53.9			53.2			(0.7		)
All other items, net(1)	29.2			29.9			0.7

	Year Ended December 31, 2011
(In millions)	Previously Reported			Revised			Effect of Change
Cash flows from operating activities:
Net income	$	268.8		$	219.1		$	(49.7	)
(Benefit from) provision for income taxes	114.7			87.9			(26.8		)
Defined benefit pension expense	63.4			139.9			76.5
Inventories	(66.9		)	(67.9		)	(1.0		)
All other items, net(1)	17.4			18.4			1.0

_______________________________________________________________________________

(1) Includes only those items which relate to the change in accounting method to mark-to-market accounting.

Consolidated Statements of Equity (Deficit) and Comprehensive Income

	December 31, 2013
	Previous Method			As Reported			Effect of Change
Retained earnings
Beginning balance	$	395.2		$	(240.3	)	$	(635.5	)
Net income	189.5			256.1			66.6
Ending balance	584.7			15.8			(568.9		)
Accumulated other comprehensive income (loss)
Beginning balance	$	(607.3	)	$	29.7		$	637.0
Other comprehensive income (loss)	48.6			(19.1		)	(67.7		)
Ending balance	(558.7		)	10.6			569.3
Total equity	$	570.8		$	571.2		$	0.4
Comprehensive income
Net income	$	191.1		$	257.7		$	66.6
Defined benefit pension and other postretirement plans net of income taxes	72.3			4.6			(67.7		)
Currency translation adjustments	(23.6		)	(23.6		)	—
Total other comprehensive income (loss)	47.7			(20.0		)	(67.7		)
Comprehensive income	238.8			237.7			(1.1		)
Comprehensive income attributable to W. R. Grace & Co. shareholders	238.1			237.0			(1.1		)

	December 31, 2012
	Previously Reported			Revised			Effect of Change
Retained earnings
Beginning balance	$	301.1		$	(280.3	)	$	(581.4	)
Net income	94.1			40.0			(54.1		)
Ending balance	395.2			(240.3		)	(635.5		)
Accumulated other comprehensive income (loss)
Beginning balance	$	(578.5	)	$	19.5		$	598.0
Other comprehensive income (loss)	(28.8		)	10.2			39.0
Ending balance	(607.3		)	29.7			637.0
Total equity	$	318.3		$	319.8		$	1.5
Comprehensive income
Net income	$	95.1		$	41.0		$	(54.1	)
Defined benefit pension and other postretirement plans net of income taxes	(36.6		)	2.3			38.9
Currency translation adjustments	5.4			5.5			0.1
Total other comprehensive income (loss)	(28.0		)	11.0			39.0
Comprehensive income	67.1			52.0			(15.1		)
Comprehensive income attributable to W. R. Grace & Co. shareholders	65.3			50.2			(15.1		)

	December 31, 2011
	Previously Reported			Revised			Effect of Change
Retained earnings
Beginning balance	$	31.7		$	(500.0	)	$	(531.7	)
Net income	269.4			219.7			(49.7		)
Ending balance	301.1			(280.3		)	(581.4		)
Accumulated other comprehensive income (loss)
Beginning balance	$	(518.1	)	$	26.7		$	544.8
Other comprehensive income (loss)	(60.4		)	(7.2		)	53.2
Ending balance	(578.5		)	19.5			598.0
Total equity	$	167.5		$	184.1		$	16.6
Comprehensive income
Net income	$	268.8		$	219.1		$	(49.7	)
Defined benefit pension and other postretirement plans net of income taxes	(46.7		)	6.2			52.9
Currency translation adjustments	(11.6		)	(11.3		)	0.3
Total other comprehensive income (loss)	(58.6		)	(5.4		)	53.2
Comprehensive income	210.2			213.7			3.5
Comprehensive income attributable to W. R. Grace & Co. shareholders	209.0			212.5			3.5