Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net sales	$ 826.7	$ 826.4	$ 1,581.1	$ 1,522.1
Cost of goods sold	522.6	521.8	999.9	965.1
Gross profit	304.1	304.6	581.2	557.0
Selling, general and administrative expenses	133.8	145.9	270.4	275.8
Restructuring expenses and related asset impairments	2.3	0.7	5.3	0.9
Research and development expenses	16.0	16.7	32.5	32.3
Defined benefit pension expense	16.8	15.1	35.6	31.6
Interest expense and related financing costs	11.3	11.0	22.6	21.4
Provision for environmental remediation	0.6	0.3	1.2	0.5
Chapter 11 expenses, net of interest income	3.7	6.7	8.2	12.5
Libby medical program settlement	19.5		19.5
Equity in earnings of unconsolidated affiliate	(3.2)	(4.2)	(8.9)	(7.7)
Other (income) expense, net	(2.2)	0.3	(2.8)	(1.9)
Total costs and expenses	198.6	192.5	383.6	365.4
Income before income taxes	105.5	112.1	197.6	191.6
Provision for income taxes	(35.8)	(36.6)	(66.6)	(62.1)
Net income	69.7	75.5	131.0	129.5
Less: Net loss (income) attributable to noncontrolling interests	(0.4)	0.3	(0.8)	0.5
Net income attributable to W. R. Grace & Co. shareholders	$ 69.3	$ 75.8	$ 130.2	$ 130.0
Basic earnings per share:
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$ 0.93	$ 1.03	$ 1.75	$ 1.77
Weighted average number of basic shares (in shares)	74.7	73.4	74.5	73.3
Diluted earnings per share:
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$ 0.90	$ 1.00	$ 1.70	$ 1.72
Weighted average number of diluted shares (in shares)	76.6	75.6	76.5	75.4