Consolidated Balance Sheets (unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 942.4	$ 1,336.9
Short-term Investments	500.0	0
Restricted cash and cash equivalents	168.5	197.6
Trade accounts receivable, less allowance of $5.2 (2012—$5.2)	470.4	474.8
Accounts receivable—unconsolidated affiliate	11.1	15.6
Inventories	313.4	278.6
Deferred income taxes	52.6	58.3
Other current assets	91.4	78.4
Total Current Assets	2,549.8	2,440.2
Properties and equipment, net of accumulated depreciation and amortization of $1,807.2 (2012—$1,785.1)	772.6	770.5
Goodwill	201.2	196.7
Patents, licenses and other intangible assets, net	78.9	82.7
Deferred income taxes	900.9	956.3
Asbestos-related insurance	500.0	500.0
Overfunded defined benefit pension plans	28.3	33.8
Investment in unconsolidated affiliate	99.5	85.5
Other assets	34.3	24.5
Total Assets	5,165.5	5,090.2
Current Liabilities
Debt payable within one year	70.7	83.4
Debt payable—unconsolidated affiliate	4.5	3.6
Accounts payable	279.3	249.4
Accounts payable—unconsolidated affiliate	3.4	2.6
Other current liabilities	274.5	307.3
Total Current Liabilities	632.4	646.3
Debt payable after one year	9.2	13.4
Debt payable—unconsolidated affiliate	22.8	22.4
Deferred income taxes	24.3	27.1
Underfunded and unfunded defined benefit pension plans	272.7	400.6
Other liabilities	45.0	45.0
Total Liabilities Not Subject to Compromise	1,006.4	1,154.8
Liabilities Subject to Compromise-Note 2
Debt plus accrued interest	989.1	973.3
Income tax contingencies	88.5	87.6
Asbestos-related contingencies	2,065.0	2,065.0
Environmental contingencies	137.0	140.5
Postretirement benefits	177.9	188.1
Other liabilities and accrued interest	167.5	162.6
Total Liabilities Subject to Compromise	3,625.0	3,617.1
Total Liabilities	4,631.4	4,771.9
Commitments and Contingencies—Note 10
Equity
Common stock issued, par value $0.01; 300,000,000 shares authorized; outstanding: 76,577,841 (2012—75,565,409)	0.8	0.8
Paid-in capital	558.3	536.5
Retained earnings	530.9	395.2
Treasury stock, at cost: shares: 412,359 (2012—1,414,351)	(4.9)	(16.8)
Accumulated other comprehensive loss	(561.5)	(607.3)
Total W. R. Grace & Co. Shareholders' Equity	523.6	308.4
Noncontrolling interests	10.5	9.9
Total Equity	534.1	318.3
Total Liabilities and Equity	$ 5,165.5	$ 5,090.2