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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (expense), net | $ (15,413) | $ (16,290) | $ (41,288) | $ (17,030)
Income tax benefit (expense) | 330,093 | 274,774 | 904,475 | 721,709
Product, net | 2,391,717 | 2,117,366 | 6,762,605 | 5,916,423
Net income attributable to Biogen Inc. | 965,622 | 856,858 | 2,715,439 | 2,051,320
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income attributable to Biogen Inc. | 42,900 | 2,700 | 117,700 | (800)
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 | (1,300) | (100) | (1,600) | 10,100
Income tax benefit (expense) | 500 | 0 | 600 | (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] |  |  |  |
Other income (expense), net | 0 | 0 | 0 | 0
Income tax benefit (expense) | (200) | (100) | (600) | (200)
Product, net | $ 43,900 | $ 2,900 | $ 119,300 | $ 7,100

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