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Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 07, 2019
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | $ 7,379.3 |  |  |  | $ 7,187.3 |  |  |  |  | $ 7,379.3 | $ 7,187.3 |  |
Total intangible assets, gross | 8,408.8 |  |  |  | 7,727.3 |  |  |  |  | 8,408.8 | 7,727.3 |  |
Accumulated Amortization | (4,881.4) |  |  |  | (4,607.3) |  |  |  |  | (4,881.4) | (4,607.3) |  |
Net | 2,497.9 |  |  |  | 2,580.0 |  |  |  |  | 2,497.9 | 2,580.0 |  |
Intangible assets, net | 3,527.4 |  |  |  | 3,120.0 |  |  |  |  | 3,527.4 | 3,120.0 |  |
Amortization and impairment of acquired intangible assets |  |  |  |  |  |  |  |  |  | 489.9 | 747.3 | $ 814.7 |
Amortization of acquired intangible assets |  |  |  |  |  |  |  |  |  | 274.0 | 381.2 | 455.3 |
Contingent Consideration | (2.6) | $ 57.8 | $ 20.0 | $ (11.5) | (79.3) | $ 87.9 | $ (1.9) | $ 5.6 |  | 63.7 | 12.3 | $ (62.7) |
Intangible Assets and Goodwill (Additional Textual) |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2020 | 260.0 |  |  |  |  |  |  |  |  | 260.0 |  |  |
Expected future amortization expense, 2021 | 220.0 |  |  |  |  |  |  |  |  | 220.0 |  |  |
Expected future amortization expense, 2022 | 225.0 |  |  |  |  |  |  |  |  | 225.0 |  |  |
Expected future amortization expense, 2023 | 230.0 |  |  |  |  |  |  |  |  | 230.0 |  |  |
Expected future amortization expense, 2024 | 220.0 |  |  |  |  |  |  |  |  | 220.0 |  |  |
Increase to goodwill |  |  |  |  |  |  |  |  |  | $ 117.5 | 1,080.1 |  |
Payment made to Forward Pharma |  |  |  |  |  |  |  |  | $ 1,250.0 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated life, (In Years) |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated life, (In Years) |  |  |  |  |  |  |  |  |  | 28 years |  |  |
In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  |  |  |  |  |  |  |  | Indefinite |  |  |
Cost and net | 965.5 |  |  |  | 476.0 |  |  |  |  | $ 965.5 | 476.0 |  |
Accumulated Amortization | 0.0 |  |  |  | 0.0 |  |  |  |  | $ 0.0 | 0.0 |  |
Impairment of IPR&D |  | 215.9 |  |  |  | 189.3 |  |  |  |  |  |  |
Trademarks and trade names |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Net | 1,800.0 |  |  |  |  |  |  |  |  | 1,800.0 |  |  |
VUMERITY |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in acquired and in-licensed rights and patents | 155.0 |  |  |  |  |  |  |  |  |  |  |  |
TECFIDERA |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Net | $ 36.1 |  |  |  |  |  |  |  | 795.2 | $ 36.1 |  |  |
Impairment of in-licensed patent |  |  |  |  | $ 176.8 |  |  |  | $ 328.2 |  |  |  |
BG00011 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration |  | $ 61.2 |  |  |  |  |  |  |  |  |  |  |
PLSR | In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of acquired intangible assets |  |  |  |  |  | 60.0 |  |  |  |  |  |  |
TGN | In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Cost and net |  |  |  |  |  | 41.8 |  |  |  |  |  |  |
Amortization of acquired intangible assets |  |  |  |  |  | $ 129.3 |  |  |  |  |  |  |
Nightstar |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  | $ 700.0

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