Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 302,366	$ 308,766
Other comprehensive income:
Unrealized gains (losses) on securities available for sale, net of tax of $ 1,122 and $6,928	1,911	(11,796)
Unrealized gains (losses) on foreign currency forward contracts, net of tax of $2,143 and $2,036	(18,363)	(17,378)
Unrealized gains (losses) on pension benefit obligations	189	11
Currency translation adjustment	25,154	52,544
Total other comprehensive income, net of tax	8,891	23,381
Comprehensive income	311,257	332,147
Comprehensive income (loss) attributable to noncontrolling interests, net of tax	(230)	17,199
Comprehensive income attributable to Biogen Idec Inc.	$ 311,487	$ 314,948

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