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Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Intangible assets |  |  |  |  |
Total intangible assets, gross | $ 7,710.3 |  | $ 7,710.3 |  | $ 7,646.3
Accumulated Amortization | (3,742.7) |  | (3,742.7) |  | (3,561.2)
Intangible assets, net | 3,967.6 |  | 3,967.6 |  | 4,085.1
Intangible Assets and Goodwill (Textual) [Abstract] |  |  |  |  |
Amortization of acquired intangible assets | 92.9 | $ 92.0 | 181.7 | $ 187.9 |
Accumulated impairment losses related to goodwill | 0.0 |  | 0.0 |  |
Expected future amortization expense, 2016 (remaining six months) | 181.6 |  | 181.6 |  |
Expected future amortization expense, 2017 | 325.1 |  | 325.1 |  |
Expected future amortization expense, 2018 | 298.2 |  | 298.2 |  |
Expected future amortization expense, 2019 | 282.7 |  | 282.7 |  |
Expected future amortization expense, 2020 | 277.1 |  | 277.1 |  |
Expected future amortization expense, 2021 | 265.0 |  | 265.0 |  |
Out-licensed patents |  |  |  |  |
Intangible assets |  |  |  |  |
Cost | 543.3 |  | 543.3 |  | 543.3
Accumulated Amortization | (514.9) |  | (514.9) |  | (506.0)
Net | 28.4 |  | $ 28.4 |  | 37.3
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
Accumulated Amortization | (2,604.5) |  | (2,604.5) |  | (2,552.9)
Net | 400.8 |  | $ 400.8 |  | 452.4
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 | 392.8 |  | $ 392.8 |  |
Acquired and in-licensed rights and patents |  |  |  |  |
Intangible assets |  |  |  |  |
Cost | 3,405.4 |  | 3,405.4 |  | 3,303.2
Accumulated Amortization | (623.3) |  | (623.3) |  | (502.3)
Net | 2,782.1 |  | $ 2,782.1 |  | 2,800.9
Acquired and in-licensed rights and patents | Minimum |  |  |  |  |
Intangible assets |  |  |  |  |
Estimated life, (in years) |  |  | 6 years |  |
Acquired and in-licensed rights and patents | Maximum |  |  |  |  |
Intangible assets |  |  |  |  |
Estimated life, (in years) |  |  | 18 years |  |
Acquired and in-licensed rights and patents | Biosimilars |  |  |  |  |
Intangible assets |  |  |  |  |
Increase in acquired and in-licensed rights and patents | 25.0 |  | $ 50.0 |  |
Acquired and in-licensed rights and patents | ZINBRYTA |  |  |  |  |
Intangible assets |  |  |  |  |
Increase in acquired and in-licensed rights and patents |  |  | 20.0 |  |
Acquired and in-licensed rights and patents | ALPROLIX |  |  |  |  |
Intangible assets |  |  |  |  |
Increase in acquired and in-licensed rights and patents |  |  | 26.5 |  |
Contingent payment made during the period |  |  | 20.0 |  |
Deferred tax liability | 6.5 |  | $ 6.5 |  |
In-process research and development |  |  |  |  |
Intangible assets |  |  |  |  |
Indefinite lived intangible assets useful life |  |  | Indefinite until commercialization |  |
Cost and Net | 692.3 |  | $ 692.3 |  | 730.5
Accumulated Amortization | 0.0 |  | $ 0.0 |  | 0.0
Trademarks and trade names |  |  |  |  |
Intangible assets |  |  |  |  |
Indefinite lived intangible assets useful life |  |  | Indefinite |  |
Cost and Net | 64.0 |  | $ 64.0 |  | 64.0
Accumulated Amortization | 0.0 |  | 0.0 |  | $ 0.0
TYSABRI product | Acquired and in-licensed rights and patents |  |  |  |  |
Intangible assets |  |  |  |  |
Net | $ 2,633.4 |  | $ 2,633.4 |  |

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