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Revenues by Product (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | $ 3,600.1 | $ 3,439.0 | $ 10,706.6 | $ 9,926.6
TECFIDERA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 1,122.4 | 1,090.0 | 3,271.4 | 3,163.7
TECFIDERA | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 842.0 | 842.1 | 2,429.5 | 2,396.8
TECFIDERA | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 280.4 | 247.9 | 841.9 | 766.9
Interferon |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 530.0 | 590.1 | 1,585.3 | 1,765.9
Interferon | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 360.3 | 421.5 | 1,067.3 | 1,237.5
Interferon | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 169.7 | 168.6 | 518.0 | 528.4
TYSABRI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 483.6 | 470.2 | 1,419.3 | 1,399.5
TYSABRI | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 263.0 | 253.0 | 772.3 | 768.2
TYSABRI | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 220.6 | 217.2 | 647.0 | 631.3
FAMPYRA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 24.2 | 22.5 | 71.2 | 69.9
FAMPYRA | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 0.0 | 0.0 | 0.0 | 0.0
FAMPYRA | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 24.2 | 22.5 | 71.2 | 69.9
ZINBRYTA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues |  |  | 0.0 | 1.4
ZINBRYTA | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues |  |  | 0.0 | 0.0
ZINBRYTA | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues |  |  | 0.0 | 1.4
MS Product Revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 2,160.2 | 2,172.8 | 6,347.2 | 6,400.4
MS Product Revenues | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 1,465.3 | 1,516.6 | 4,269.1 | 4,402.5
MS Product Revenues | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 694.9 | 656.2 | 2,078.1 | 1,997.9
SPINRAZA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 547.1 | 467.7 | 1,553.8 | 1,254.3
SPINRAZA | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 236.7 | 223.9 | 690.6 | 617.8
SPINRAZA | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 310.4 | 243.8 | 863.2 | 636.5
BENEPALI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 115.9 | 123.4 | 360.2 | 359.9
BENEPALI | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 0.0 | 0.0 | 0.0 | 0.0
BENEPALI | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 115.9 | 123.4 | 360.2 | 359.9
IMRALDI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 49.3 | 0.0 | 132.3 | 0.0
IMRALDI | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 0.0 | 0.0 | 0.0 | 0.0
IMRALDI | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 49.3 | 0.0 | 132.3 | 0.0
FLIXABI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 18.4 | 11.4 | 49.9 | 29.2
FLIXABI | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 0.0 | 0.0 | 0.0 | 0.0
FLIXABI | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 18.4 | 11.4 | 49.9 | 29.2
Biosimilars |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 183.6 | 134.8 | 542.4 | 389.1
Biosimilars | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 0.0 | 0.0 | 0.0 | 0.0
Biosimilars | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 183.6 | 134.8 | 542.4 | 389.1
FUMADERM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 3.8 | 4.8 | 11.6 | 17.3
FUMADERM | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 0.0 | 0.0 | 0.0 | 0.0
FUMADERM | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 3.8 | 4.8 | 11.6 | 17.3
Product, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 2,894.7 | 2,780.1 | 8,455.0 | 8,061.1
Product, net | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | 1,702.0 | 1,740.5 | 4,959.7 | 5,020.3
Product, net | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Product revenues | $ 1,192.7 | $ 1,039.6 | $ 3,495.3 | $ 3,040.8

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