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v3.3.1.900

Accumulated Other Comprehensive Income (Loss) (Details 1) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  | $ (123.7) | $ (25.8) | $ (34.9)
Income tax expense |  |  |  |  |  |  |  |  | 1,161.6 | 989.9 | 601.0
Product, net | $ (2,425.9) | $ (2,391.7) | $ (2,198.6) | $ (2,172.3) | $ (2,287.0) | $ (2,117.3) | $ (2,056.3) | $ (1,742.8) | (9,188.5) | (8,203.4) | (5,542.3)
Net income attributable to Biogen Inc. | $ 831.6 | $ 965.6 | $ 927.3 | $ 822.5 | $ 883.5 | $ 856.9 | $ 714.5 | $ 480.0 | 3,547.0 | 2,934.8 | 1,862.3
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Biogen Inc. |  |  |  |  |  |  |  |  | 171.0 | 12.7 | (3.3)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  | (2.0) | 9.9 | 15.9
Income tax expense |  |  |  |  |  |  |  |  | 0.7 | (3.5) | (5.5)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  | (0.1) | 0.0 | 0.0
Income tax expense |  |  |  |  |  |  |  |  | (0.8) | (0.5) | (0.5)
Product, net |  |  |  |  |  |  |  |  | $ (173.2) | $ (6.8) | $ (13.2)

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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=6907707&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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