Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net sales	$ 3,051.5	$ 3,243.0	$ 3,060.7
Cost of goods sold	1,884.0	2,050.6	1,918.6
Gross profit	1,167.5	1,192.4	1,142.1
Selling, general and administrative expenses	574.2	664.0	505.7
Research and development expenses	69.6	79.5	65.2
Interest expense and related financing costs	100.1	61.5	43.8
Interest accretion on deferred payment obligations	0.8	65.7	0.0
Repositioning expenses	64.3	0.0	0.0
Loss in Venezuela	59.6	1.0	8.5
Equity in earnings of unconsolidated affiliate	(20.4)	(19.7)	(22.9)
Asbestos and bankruptcy-related charges, net	(8.7)	7.1	21.9
Chapter 11 expenses, net	5.1	11.0	15.3
Gain on termination and curtailment of postretirement plans	4.5	39.5	0.0
Default interest settlement	0.0	0.0	129.0
Other expense, net	(17.8)	(27.5)	(15.0)
Total costs and expenses	857.9	858.1	781.5
Income before income taxes	309.6	334.3	360.6
Provision for income taxes	(164.7)	(57.0)	(102.9)
Net income	144.9	277.3	257.7
Less: Net income attributable to noncontrolling interests	(0.7)	(1.0)	(1.6)
Net income attributable to W. R. Grace & Co. shareholders	$ 144.2	$ 276.3	$ 256.1
Basic earnings per share:
Net income attributable to W. R. Grace & Co. shareholders	$ 2.00	$ 3.67	$ 3.35
Weighted average number of basic shares	72.0	75.3	76.4
Diluted earnings per share:
Net income attributable to W. R. Grace & Co. shareholders	$ 1.99	$ 3.63	$ 3.30
Weighted average number of diluted shares	72.6	76.2	77.7