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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details 1) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (expense), net | $ (58.5) | $ (10.9) | $ (111.3) | $ (25.9)
Income tax benefit (expense) | 353.6 | 292.5 | 710.0 | 574.4
Product, net | (2,466.0) | (2,198.6) | (4,775.4) | (4,370.9)
Net income attributable to Biogen Inc. | 1,049.8 | 927.3 | 2,020.7 | 1,749.8
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income attributable to Biogen Inc. | (4.7) | 40.1 | 4.0 | 74.8
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 | (0.6) | (0.2) | (0.6) | (0.3)
Income tax benefit (expense) | 0.2 | 0.1 | 0.2 | 0.1
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 | 0.1 | 0.0
Income tax benefit (expense) | 0.1 | (0.2) | 0.0 | (0.4)
Product, net | (4.3) | (40.4) | (4.5) | (75.4)
Operating expenses | $ (0.1) | $ 0.0 | $ (0.2) | $ 0.0

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