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Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Intangible assets |  |  |
Amortization of acquired intangible assets | $ 448.5 | $ 88.8 |
Total intangible assets, gross | 8,153.4 |  | $ 7,742.3
Accumulated Amortization | (4,049.5) |  | (3,934.0)
Intangible assets, net | 4,103.9 |  | 3,808.3
Payment made to Forward Pharma | 1,250.0 |  |
TECFIDERA intellectual property charges |  |  | 454.8
Intangible Assets and Goodwill (Textual) [Abstract] |  |  |
Accumulated impairment losses related to goodwill | 0.0 |  |
Expected future amortization expense, 2017 (remaining nine months) | 346.5 |  |
Expected future amortization expense, 2018 | 425.5 |  |
Expected future amortization expense, 2019 | 412.4 |  |
Expected future amortization expense, 2020 | 378.5 |  |
Expected future amortization expense, 2021 | 239.2 |  |
Expected future amortization expense, 2022 | 216.7 |  |
TECFIDERA |  |  |
Intangible assets |  |  |
Amortization of acquired intangible assets | 353.6 |  |
Increase in acquired and in-licensed rights and patents | 795.2 |  |
Out-licensed patents |  |  |
Intangible assets |  |  |
Cost | 543.3 |  | 543.3
Accumulated Amortization | (526.6) |  | (523.6)
Net | $ 16.7 |  | 19.7
Out-licensed patents | Minimum |  |  |
Intangible assets |  |  |
Estimated life, (in years) | 13 years |  |
Out-licensed patents | Maximum |  |  |
Intangible assets |  |  |
Estimated life, (in years) | 23 years |  |
Developed technology |  |  |
Intangible assets |  |  |
Cost | $ 3,005.3 |  | 3,005.3
Accumulated Amortization | (2,648.1) |  | (2,634.3)
Net | $ 357.2 |  | 371.0
Developed technology | Minimum |  |  |
Intangible assets |  |  |
Estimated life, (in years) | 15 years |  |
Developed technology | Maximum |  |  |
Intangible assets |  |  |
Estimated life, (in years) | 23 years |  |
Developed technology | AVONEX |  |  |
Intangible assets |  |  |
Net | $ 349.8 |  |
Acquired and in-licensed rights and patents |  |  |
Intangible assets |  |  |
Cost | 3,887.1 |  | 3,481.7
Accumulated Amortization | (874.8) |  | (776.1)
Net | $ 3,012.3 |  | 2,705.6
Acquired and in-licensed rights and patents | Minimum |  |  |
Intangible assets |  |  |
Estimated life, (in years) | 4 years |  |
Acquired and in-licensed rights and patents | Maximum |  |  |
Intangible assets |  |  |
Estimated life, (in years) | 18 years |  |
In Process Research and Development [Member] |  |  |
Intangible assets |  |  |
Indefinite lived intangible assets useful life | Indefinite until commercialization |  |
Cost and Net | $ 653.7 |  | 648.0
Accumulated Amortization | $ 0.0 |  | 0.0
Trademarks and Trade Names [Member] |  |  |
Intangible assets |  |  |
Indefinite lived intangible assets useful life | Indefinite |  |
Cost and Net | $ 64.0 |  | 64.0
Accumulated Amortization | 0.0 |  | $ 0.0
TYSABRI product | Acquired and in-licensed rights and patents |  |  |
Intangible assets |  |  |
Net | $ 2,418.6 |  |

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