Consolidated Statements of Operations (unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net sales	$ 771.3	$ 776.6	$ 2,284.0	$ 2,357.7
Cost of goods sold	486.6	491.8	1,432.2	1,491.7
Gross profit	284.7	284.8	851.8	866.0
Selling, general and administrative expenses	125.2	130.8	391.7	401.2
Restructuring expenses and related asset impairments	3.6	1.1	8.7	6.4
Research and development expenses	15.0	15.4	48.5	47.9
Defined benefit pension expense	18.2	17.6	54.9	53.2
Interest expense and related financing costs	10.7	11.5	32.1	34.1
Provision for environmental remediation	1.7	0.6	4.0	1.8
Chapter 11 expenses, net of interest income	2.9	4.4	11.0	12.6
Libby medical program settlement	0	0.1	0	19.6
Equity in earnings of unconsolidated affiliate	(2.8)	(4.9)	(17.1)	(13.8)
Other (income) expense, net	0.7	(3.2)	5.1	(6.0)
Total costs and expenses	175.2	173.4	538.9	557.0
Income before income taxes	109.5	111.4	312.9	309.0
Provision for income taxes	(39.8)	(35.4)	(106.7)	(102.0)
Net income	69.7	76.0	206.2	207.0
Less: Net income attributable to noncontrolling interests	(0.3)	(0.5)	(1.1)	(1.3)
Net income attributable to W. R. Grace & Co. shareholders	$ 69.4	$ 75.5	$ 205.1	$ 205.7
Basic earnings per share:
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$ 0.90	$ 1.01	$ 2.69	$ 2.75
Weighted average number of basic shares	76.7	75.0	76.2	74.7
Diluted earnings per share:
Net income attributable to W. R. Grace & Co. shareholders (in dollars per share)	$ 0.89	$ 0.99	$ 2.64	$ 2.70
Weighted average number of diluted shares	77.9	76.4	77.6	76.2