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Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Intangible assets |  |  |  |  |  |  |
Amortization of acquired intangible assets | $ 117.5 |  |  | $ 92.9 | $ 566.0 | $ 181.7 |
Total intangible assets, gross | 8,218.3 |  | $ 7,742.3 |  | 8,218.3 |  | $ 7,742.3
Accumulated Amortization | (4,167.0) |  | (3,934.0) |  | (4,167.0) |  | (3,934.0)
Intangible assets, net | 4,051.3 |  | 3,808.3 |  | 4,051.3 |  | 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 |  |  |  | 0.0 |  |
Expected future amortization expense, 2017 (remaining six months) | 222.6 |  |  |  | 222.6 |  |
Expected future amortization expense, 2018 | 425.8 |  |  |  | 425.8 |  |
Expected future amortization expense, 2019 | 412.5 |  |  |  | 412.5 |  |
Expected future amortization expense, 2020 | 378.6 |  |  |  | 378.6 |  |
Expected future amortization expense, 2021 | 239.3 |  |  |  | 239.3 |  |
Expected future amortization expense, 2022 | 216.7 |  |  |  | 216.7 |  |
TECFIDERA |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Amortization of acquired intangible assets | 29.4 |  |  |  | 383.0 |  |
Increase in acquired and in-licensed rights and patents |  | $ 795.2 |  |  |  |  |
Out-licensed patents |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Cost | 543.3 |  | 543.3 |  | 543.3 |  | 543.3
Accumulated Amortization | (529.8) |  | (523.6) |  | (529.8) |  | (523.6)
Net | 13.5 |  | 19.7 |  | $ 13.5 |  | 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 |  | $ 3,005.3 |  | 3,005.3
Accumulated Amortization | (2,662.2) |  | (2,634.3) |  | (2,662.2) |  | (2,634.3)
Net | 343.1 |  | 371.0 |  | $ 343.1 |  | 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 | 335.9 |  |  |  | $ 335.9 |  |
Acquired and in-licensed rights and patents |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Cost | 3,937.1 |  | 3,481.7 |  | 3,937.1 |  | 3,481.7
Accumulated Amortization | (975.0) |  | (776.1) |  | (975.0) |  | (776.1)
Net | 2,962.1 |  | 2,705.6 |  | $ 2,962.1 |  | 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 |  |
Acquired and in-licensed rights and patents | SPINRAZA |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Increase in acquired and in-licensed rights and patents |  |  | 60.0 |  | $ 50.0 |  |
In Process Research and Development [Member] |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  |  |  | Indefinite until commercialization |  |
Cost and Net | 668.6 |  | 648.0 |  | $ 668.6 |  | 648.0
Accumulated Amortization | 0.0 |  | 0.0 |  | $ 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 |  | $ 64.0 |  | 64.0
Accumulated Amortization | 0.0 |  | $ 0.0 |  | 0.0 |  | $ 0.0
TYSABRI product | Acquired and in-licensed rights and patents |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |
Net | $ 2,351.8 |  |  |  | $ 2,351.8 |  |

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