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Equity (Details Textual) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jul. 18, 2016 | May 31, 2015
Subsequent Event [Line Items] |  |  |  |  |  |
Authorized amount of share repurchases under the 2015 Share Repurchase Program |  |  |  |  |  | $ 5,000.0
Equity increase during the period |  |  | $ 2,028.8 |  |  |
Net income attributable to Biogen Inc. | $ 1,049.8 | $ 927.3 | $ 2,020.7 | $ 1,749.8 |  |
Common stock shares authorized for repurchased | 1.3 |  | 1.3 |  |  |
Repurchase of common stock, shares |  |  |  | 0.1 |  |
Purchase of treasury stock |  |  | $ 0.0 | $ 42.2 |  |
Subsequent event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Authorized amount of share repurchases under the 2015 Share Repurchase Program |  |  |  |  | $ 5,000.0 |

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