Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share

Schedule of reconciliation of the numerators and denominators used in calculating basic and diluted earnings per share

	Three Months Ended March 31,
(In millions, except per share amounts)	2012		2011
Numerators
Net income attributable to W. R. Grace & Co. shareholders	$	60.9	$	54.2
Denominators
Weighted average common shares—basic calculation		74.3		73.2
Dilutive effect of employee stock options		2.1		1.9
Weighted average common shares—diluted calculation		76.4		75.1
Basic earnings per share	$	0.82	$	0.74
Diluted earnings per share	$	0.80	$	0.72