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Revenues Revenues by Product (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Product, net | $ 2,523.5 | $ 2,380.1
U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 1,538.0 | 1,631.0
Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 985.5 | 749.1
TECFIDERA |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 986.9 | 958.2
TECFIDERA | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 728.9 | 751.1
TECFIDERA | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 258.0 | 207.1
Interferon |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 550.3 | 648.3
Interferon | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 371.4 | 464.8
Interferon | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 178.9 | 183.5
TYSABRI |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 462.1 | 545.0
TYSABRI | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 249.7 | 305.5
TYSABRI | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 212.4 | 239.5
FAMPYRA |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 24.4 | 20.5
FAMPYRA | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 0.0
FAMPYRA | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 24.4 | 20.5
ZINBRYTA |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 1.4 | 10.7
ZINBRYTA | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 0.0
ZINBRYTA | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 1.4 | 10.7
SPINRAZA |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 363.9 | 47.4
SPINRAZA | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 188.0 | 46.4
SPINRAZA | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 175.9 | 1.0
ELOCTATE |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 48.4
ELOCTATE | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 42.2
ELOCTATE | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 6.2
ALPROLIX |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 26.0
ALPROLIX | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 21.0
ALPROLIX | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 5.0
FUMADERM |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 7.0 | 9.7
FUMADERM | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 0.0
FUMADERM | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 7.0 | 9.7
BENEPALI |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 120.9 | 65.3
BENEPALI | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 0.0
BENEPALI | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 120.9 | 65.3
FLIXABI |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 6.6 | 0.6
FLIXABI | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | 0.0 | 0.0
FLIXABI | Rest of world |  |
Disaggregation of Revenue [Line Items] |  |
Product, net | $ 6.6 | $ 0.6

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