Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales	$ 3,155.5	$ 3,211.9	$ 2,675.0
Cost of goods sold	1,989.2	2,050.6	1,726.4
Gross profit	1,166.3	1,161.3	948.6
Selling, general and administrative expenses	537.5	568.4	514.4
Restructuring expenses and related asset impairments	6.9	6.9	11.2
Research and development expenses	64.5	68.5	60.3
Defined benefit pension expense	71.2	63.4	77.1
Interest expense and related financing costs	46.5	43.3	41.3
Provision for environmental remediation	3.6	17.8	4.5
Chapter 11 expenses, net of interest income	16.6	20.0	17.7
Libby medical program settlement	19.6	0	0
Provision for asbestos-related contingencies	365.0	0	0
Equity in earnings of unconsolidated affiliates	(18.5)	(15.2)	(17.8)
Other (income) expense, net	(4.4)	4.7	0
Total costs and expenses	1,108.5	777.8	708.7
Income before income taxes	57.8	383.5	239.9
Benefit from (provision for) income taxes	37.3	(114.7)	(32.5)
Net income	95.1	268.8	207.4
Less: Net loss (income) attributable to noncontrolling interests	(1.0)	0.6	(0.3)
Net income attributable to W. R. Grace & Co. shareholders	$ 94.1	$ 269.4	$ 207.1
Basic earnings per share:
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$ 1.26	$ 3.66	$ 2.85
Weighted average number of basic shares (in shares)	74.9	73.6	72.7
Diluted earnings per share:
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$ 1.23	$ 3.57	$ 2.78
Weighted average number of diluted shares (in shares)	76.3	75.5	74.4