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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (expense), net | $ (10,889) | $ 4,861 | $ (25,875) | $ (740)
Income tax benefit (expense) | 292,501 | 268,521 | 574,382 | 446,935
Product, net | (2,198,566) | (2,056,292) | (4,370,888) | (3,799,057)
Net income attributable to Biogen Inc. | 927,276 | 714,506 | 1,749,817 | 1,194,462
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income attributable to Biogen Inc. | 40,100 | 700 | 74,800 | (3,500)
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (expense), net | (200) | 10,100 | (300) | 10,200
Income tax benefit (expense) | 100 | (3,600) | 100 | (3,600)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax benefit (expense) | (200) | (500) | (400) | (100)
Product, net | $ (40,400) | $ (5,300) | $ (75,400) | $ (10,000)

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