Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 83.3	$ 69.7	$ 136.5	$ 131.0
Other comprehensive income (loss):
Defined benefit pension and other postretirement plans, net of income taxes	33.3	(37.4)	69.5	(27.3)
Currency translation adjustments	(16.8)	(15.6)	(23.3)	(9.4)
Gain (loss) from hedging activities, net of income taxes	(0.8)	1.6	(0.4)	1.5
Total other comprehensive income (loss) attributable to noncontrolling interests	(0.4)	0.2	(0.2)	0.3
Total other comprehensive income	15.3	(51.2)	45.6	(34.9)
Comprehensive income	98.6	18.5	182.1	96.1
Less: comprehensive income attributable to noncontrolling interests	(0.1)	(0.6)	(0.6)	(1.1)
Comprehensive income attributable to W. R. Grace & Co. shareholders	$ 98.5	$ 17.9	$ 181.5	$ 95.0