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Investments in Variable Interest Entities (Tables) | 12 Months Ended
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Dec. 31, 2013
Investments in Variable Interest Entities [Abstract] |
Summary Of Activity Related To Collaboration With Knopp |
| For the Years Ended December 31,
(In millions) | 2013 |  | 2012 |  | 2011
Milestone payments made to Knopp | $ | — |  |  | $ | — |  |  | $ | 10.0 |
Biogen Idec’s share of expense reflected within our consolidated statements of income | $ | — |  |  | $ | 113.0 |  |  | $ | 54.8 |
Collaboration expense attributed to noncontrolling interests, net of tax | $ | — |  |  | $ | — |  |  | $ | 8.6 |
Summary Of Activity Related To Collaboration With Neurimmune |
| For the Years Ended December 31,
(In millions) | 2013 |  | 2012 |  | 2011
Milestone payments made to Neurimmune | $ | — |  |  | $ | — |  |  | $ | 15.0 |
Biogen Idec’s share of expense reflected within our consolidated statements of income | $ | 27.2 |  |  | $ | 13.3 |  |  | $ | 24.2 |
Collaboration expense attributed to noncontrolling interests, net of tax | $ | — |  |  | $ | — |  |  | $ | 14.7 |
Summary Of Activity Related To Collaboration With Neurimmune Along With Estimate Of Additional Future Development |
(In millions) | As of December 31, 2013
Total expense incurred by Biogen Idec | $ | 115.7 |
Estimate of additional amounts to be incurred by us in development of the lead compound | $ | 800.9 |

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