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Other Consolidated Financial Statement Detail (Details Textual) € in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2015 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 EUR (€) | Jun. 30, 2013 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TECFIDERA litigation settlement and license charges |  |  |  |  |  |  |  |  |  |  |  | $ 454.8 | $ 0.0 | $ 0.0 |  |
Increase to goodwill |  |  |  |  |  |  |  |  |  |  |  | 1,026.9 | 908.1 |  |  |
Accrued construction in progress |  | $ 134.0 |  |  |  | $ 87.9 |  |  |  |  |  | 134.0 | 87.9 |  |  |
Contingent consideration obligation |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 274.5 |  |  |
Prepaid taxes |  | 817.0 |  |  |  | 550.6 |  |  |  |  |  | 817.0 | 550.6 |  |  |
Product, net |  | 2,502.9 | $ 2,539.6 | $ 2,466.0 | $ 2,309.4 | 2,425.9 | $ 2,391.7 | $ 2,198.6 | $ 2,172.3 |  |  | 9,817.9 | 9,188.5 | 8,203.4 |  |
Accrued expenses and other long-term deferred revenue |  | 722.5 |  |  |  | $ 905.8 |  |  |  |  |  | 722.5 | 905.8 |  |  |
Solothurn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued construction in progress |  | 100.0 |  |  |  |  |  |  |  |  |  | 100.0 |  |  |  |
Convergence Pharmaceuticals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration obligation | $ 274.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TECFIDERA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product, net |  |  |  |  |  |  |  |  |  |  |  | 3,968.1 | 3,638.4 | $ 2,909.2 |  |
TECFIDERA | Fumapharm AG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase to goodwill |  |  |  |  |  |  |  |  |  |  |  | 1,200.0 | $ 900.0 |  |  |
TECFIDERA | Eleven billion | Fumapharm AG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase to goodwill |  |  |  |  |  |  |  |  |  |  |  | 300.0 |  |  |  |
Cumulative sales level |  | 11,000.0 |  |  |  |  |  |  |  |  |  | 11,000.0 |  |  |  |
ITALY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed settlement |  | $ (37.4) |  |  |  |  |  |  |  |  | $ (30.7) | (37.4) |  |  |  | $ (33.3)
Reimbursement Limit Stated In Resolution |  |  |  |  |  |  |  |  |  | 24 days | 24 days |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.4
Loss contingency, adjustment related to claim amount, percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Product, net |  |  |  |  |  |  |  |  |  | $ 53.5 |  | $ 42.0 |  |  |  |
Accrued expenses and other long-term deferred revenue | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 79 |

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