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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income attributable to Biogen Inc. | $ 965,622 | $ 856,858 | $ 2,715,439 | $ 2,051,320
Other comprehensive income: |  |  |  |
Unrealized gains (losses) on securities available for sale, net of tax of $(1,320) and $(6) for the three months ended September 30, 2015 and 2014, respectively; and $(699) and $(3,021) for the nine months ended September 30, 2015 and 2014, respectively | (2,239) | 12 | (1,154) | (5,127)
Unrealized gains (losses) on cash flow hedges, net of tax of $(187) and $302 for the three months ended September 30, 2015 and 2014, respectively; and $(229) and $307 for the nine months ended September 30, 2015 and 2014, respectively | (31,171) | 48,242 | (40,084) | 64,793
Unrealized gains (losses) on pension benefit obligation | 523 | 691 | 4,632 | 1,338
Currency translation adjustment | (23,504) | (60,254) | (61,322) | (71,246)
Total other comprehensive income (loss), net of tax | (56,391) | (11,309) | (97,928) | (10,242)
Comprehensive income attributable to Biogen Inc. | 909,231 | 845,549 | 2,617,511 | 2,041,078
Comprehensive income (loss) attributable to noncontrolling interests, net of tax | 53,586 | (738) | 49,053 | 7,660
Comprehensive income | $ 962,817 | $ 844,811 | $ 2,666,564 | $ 2,048,738

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