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Collaborative and Other Relationships Collaborative and Other Relationships - Collaborations (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Mar. 31, 2016
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development | $ 423.4 |  |  | $ 437.3
Other | 90.0 |  |  | 87.9
Product, net | 2,380.1 |  |  | $ 2,309.4
Bristol-Myers Squibb |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Research and development | 300.0 |  |  |
Additional milestone payments | 410.0 |  |  |
iPerian |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Additional milestone payments | $ 550.0 |  |  |
AbbVie |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Biogen share of co-promotion profits or losses | 50.00% |  |  |
AbbVie | U.S. |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Other | $ 5.9 |  |  |
Ionis Pharmaceuticals [Member] |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
License Fee |  |  | $ 75.0 |
Ionis Pharmaceuticals [Member] | SPINRAZA |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Additional milestone payments | 90.0 |  |  |
Ionis Pharmaceuticals [Member] | SPINRAZA | U.S. |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Product, net | 46.4 |  |  |
Ionis Pharmaceuticals [Member] | SPINRAZA | Rest of world |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Product, net | $ 1.0 |  |  |
Acquired and in-licensed rights and patents | SPINRAZA |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Increase in acquired and in-licensed rights and patents |  | $ 60.0 |  |
Minimum | Ionis Pharmaceuticals [Member] | SPINRAZA |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Royalty payments per the collaboration | 11.00% |  |  |
Maximum | Ionis Pharmaceuticals [Member] | SPINRAZA |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Royalty payments per the collaboration | 15.00% |  |  |
FY 2017 | iPerian |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Additional milestone payments | $ 60.0 |  |  |

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- Definition The costs incurred in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Research and Development -URI http://asc.fasb.org/extlink&oid=6523717 + Details
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