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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (expense), net | $ (68.2) | $ (58.5) | $ (105.8) | $ (111.3)
Income tax benefit (expense) | 269.6 | 353.6 | 508.8 | 710.0
Product, net | 2,639.7 | 2,466.0 | 5,019.8 | 4,775.4
Net income attributable to Biogen Inc. | 862.8 | 1,049.8 | 1,610.4 | 2,020.7
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income attributable to Biogen Inc. | (2.8) | (4.7) | 3.5 | 4.0
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 | (0.1) | (0.6) | (0.8) | (0.6)
Income tax benefit (expense) | 0.0 | 0.2 | 0.3 | 0.2
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 | 0.1
Income tax benefit (expense) | 0.0 | 0.1 | 0.0 | 0.0
Product, net | 3.0 | 4.3 | 3.7 | 4.5
Operating expenses | $ 0.3 | $ 0.1 | $ 0.2 | $ 0.2

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