Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 53.2	$ 61.3
Other comprehensive income (loss):
Defined benefit pension and other postretirement plans, net of income taxes	36.2	10.1
Currency translation adjustments	(6.5)	6.2
Gain (loss) from hedging activities, net of income taxes	0.4	(0.1)
Total other comprehensive income (loss) attributable to noncontrolling interests	0.2	0.1
Total other comprehensive income	30.3	16.3
Comprehensive income	83.5	77.6
Less: comprehensive income attributable to noncontrolling interests	(0.5)	(0.5)
Comprehensive income attributable to W. R. Grace & Co. shareholders	$ 83.0	$ 77.1