Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net sales	$ 776.6	$ 864.2	$ 2,357.7	$ 2,386.3
Cost of goods sold	491.8	547.8	1,491.7	1,512.9
Gross profit	284.8	316.4	866.0	873.4
Selling, general and administrative expenses	130.8	148.2	401.2	424.0
Restructuring expenses and related asset impairments	1.1	0.1	6.4	1.0
Research and development expenses	15.4	16.8	47.9	49.1
Defined benefit pension expense	17.6	15.9	53.2	47.5
Interest expense and related financing costs	11.5	11.1	34.1	32.5
Provision for environmental remediation	0.6	1.1	1.8	1.6
Chapter 11 expenses, net of interest income	4.4	4.4	12.6	16.9
Libby medical program settlement	0.1		19.6
Equity in earnings of unconsolidated affiliate	(4.9)	(5.5)	(13.8)	(13.2)
Other (income) expense, net	(3.2)	2.7	(6.0)	0.8
Total costs and expenses	173.4	194.8	557.0	560.2
Income before income taxes	111.4	121.6	309.0	313.2
Provision for income taxes	(35.4)	(40.4)	(102.0)	(102.5)
Net income	76.0	81.2	207.0	210.7
Less: Net loss (income) attributable to noncontrolling interests	(0.5)	0.1	(1.3)	0.6
Net income attributable to W. R. Grace & Co. shareholders	$ 75.5	$ 81.3	$ 205.7	$ 211.3
Basic earnings per share:
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$ 1.01	$ 1.10	$ 2.75	$ 2.87
Weighted average number of basic shares (in shares)	75.0	73.7	74.7	73.5
Diluted earnings per share:
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$ 0.99	$ 1.07	$ 2.70	$ 2.80
Weighted average number of diluted shares (in shares)	76.4	75.7	76.2	75.5