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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details 1) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other income (expense), net | $ (41.0) | $ (38.0)
Income tax expense (benefit) | 322.5 | 239.2
Product, net | 2,523.5 | 2,380.1
Net income attributable to Biogen Inc. | 1,172.9 | 747.6
Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net income attributable to Biogen Inc. | (37.4) | 6.3
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 | (7.6) | (0.7)
Income tax expense (benefit) | 1.6 | 0.3
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 | 0.1 | 0.1
Income tax expense (benefit) | 0.1 | 0.0
Product, net | 32.9 | 6.7
Operating expenses | $ 1.3 | $ 0.1

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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