Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$ 257.7	$ 41.0	$ 219.1
Other comprehensive income (loss):
Defined benefit pension and other postretirement plans, net of income taxes	4.6	2.3	6.2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(23.6)	5.5	(11.3)
Gain (loss) from hedging activities, net of income taxes	(0.2)	2.4	(2.1)
Total other comprehensive income (loss) attributable to noncontrolling interests	(0.9)	0.8	1.8
Total other comprehensive loss	(20.0)	11.0	(5.4)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	237.7	52.0	213.7
Less: comprehensive (income) loss attributable to noncontrolling interests	0.1	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	(0.7)	(1.8)	(1.2)
Comprehensive income attributable to W.R. Grace & Co. shareholders	$ 237.0	$ 50.2	$ 212.5