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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Net income attributable to Biogen Idec Inc. $ 856,858 $ 487,616 $ 2,051,320 $ 1,405,035
Other comprehensive income:        
Unrealized gains (losses) on securities available for sale, net of tax of $(6) and $3,639 for the three months ended September 30, 2014 and 2013, respectively; and $(3,021) and $6,554 for the nine months ended September 30, 2014 and 2013, respectively 12 6,211 (5,127) 11,171
Unrealized gains (losses) on foreign currency forward contracts, net of tax of $302 and $(298) for the three months ended September 30, 2014 and 2013, respectively; and $307 and $1,182 for the nine months ended September 30, 2014 and 2013, respectively 48,242 (14,847) 64,793 (5,549)
Unrealized gains (losses) on pension benefit obligation 691 892 1,338 3,167
Currency translation adjustment (60,254) 33,564 (71,246) 17,201
Total other comprehensive income (loss), net of tax (11,309) 25,820 (10,242) 25,990
Comprehensive income attributable to Biogen Idec Inc. 845,549 513,436 2,041,078 1,431,025
Comprehensive income (loss) attributable to noncontrolling interests, net of tax (738) 0 7,660 0
Comprehensive income $ 844,811 $ 513,436 $ 2,048,738 $ 1,431,025