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Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Preferred stock | Common stock | Additional paid-in capital | Accumulated other comprehensive loss | Accumulated other comprehensive loss Cumulative Effect, Period of Adoption, Adjustment | Retained earnings | Retained earnings Cumulative Effect, Period of Adoption, Adjustment | Treasury stock | Total Biogen Inc. shareholders’ equity | Total Biogen Inc. shareholders’ equity Cumulative Effect, Period of Adoption, Adjustment | Noncontrolling interests | 2020 Share Repurchase Program | 2020 Share Repurchase Program Common stock | 2020 Share Repurchase Program Additional paid-in capital | 2020 Share Repurchase Program Retained earnings | 2020 Share Repurchase Program Treasury stock | 2020 Share Repurchase Program Total Biogen Inc. shareholders’ equity | December 2019 Share Repurchase Program | December 2019 Share Repurchase Program Common stock | December 2019 Share Repurchase Program Additional paid-in capital | December 2019 Share Repurchase Program Retained earnings | December 2019 Share Repurchase Program Treasury stock | December 2019 Share Repurchase Program Total Biogen Inc. shareholders’ equity | March 2019 Share Repurchase Program | March 2019 Share Repurchase Program Common stock | March 2019 Share Repurchase Program Additional paid-in capital | March 2019 Share Repurchase Program Retained earnings | March 2019 Share Repurchase Program Treasury stock | March 2019 Share Repurchase Program Total Biogen Inc. shareholders’ equity | 2018 Share Repurchase Program | 2018 Share Repurchase Program Common stock | 2018 Share Repurchase Program Additional paid-in capital | 2018 Share Repurchase Program Retained earnings | 2018 Share Repurchase Program Treasury stock | 2018 Share Repurchase Program Total Biogen Inc. shareholders’ equity | 2016 Share Repurchase Program | 2016 Share Repurchase Program Common stock | 2016 Share Repurchase Program Additional paid-in capital | 2016 Share Repurchase Program Retained earnings | 2016 Share Repurchase Program Treasury stock | 2016 Share Repurchase Program Total Biogen Inc. shareholders’ equity
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Beginning balance (in shares) at Dec. 31, 2017 |  |  | 0.0 | 235.3 |  |  |  |  |  | 23.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 12,598.1 | $ 106.1 | $ 0.0 | $ 0.1 | $ 97.8 | $ (318.4) | $ 1.5 | $ 15,810.4 | $ 104.6 | $ (2,977.1) | $ 12,612.8 | $ 106.1 | $ (14.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 4,474.0 |  |  |  |  |  |  | 4,430.7 |  |  | 4,430.7 |  | 43.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 76.1 |  |  |  |  | 76.5 |  |  |  |  | 76.5 |  | (0.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution from noncontrolling interest | 13.8 |  |  |  |  |  |  |  |  |  | 0.0 |  | 13.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution to noncontrolling interests | (50.0) |  |  |  |  |  |  |  |  |  | 0.0 |  | (50.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock pursuant to the share repurchase program, at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4.3) |  |  |  | (4.3) |  | (10.5) |  |  |  | (10.5) |
Repurchase of common stock pursuant to the share repurchase program, at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,352.6) |  |  |  | $ (1,352.6) | $ (1,352.6) | $ (3,000.0) |  |  |  | $ (3,000.0) | $ (3,000.0)
Retirement of common stock pursuant to the share repurchase program, at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.3 |  |  | 4.3 |  |  | 10.5 |  |  | 10.5 |
Retirement of common stock pursuant to the share repurchase program, at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ (92.8) | $ (1,259.8) | $ 1,352.6 | 0.0 | $ 0.0 | $ 0.0 | $ (171.1) | $ (2,828.9) | $ 3,000.0 | $ 0.0
Issuance of common stock under stock option and stock purchase plans (in shares) |  |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock option and stock purchase plans | 41.2 |  |  | $ 0.0 | 41.2 |  |  |  |  |  | 41.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock award plan (in shares) |  |  |  | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock award plan | (43.8) |  |  | $ 0.0 | (43.8) |  |  |  |  |  | (43.8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to share-based payments | 168.7 |  |  |  | 168.7 |  |  |  |  |  | 168.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  |  | 0.0 | 221.0 |  |  |  |  |  | 23.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | 13,031.6 |  | $ 0.0 | $ 0.1 | 0.0 | (240.4) |  | 16,257.0 |  | $ (2,977.1) | 13,039.6 |  | (8.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 5,888.5 |  |  |  |  |  |  | 5,888.5 |  |  | 5,888.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 104.8 |  |  |  |  | 105.2 |  |  |  |  | 105.2 |  | (0.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution from noncontrolling interest | 4.3 |  |  |  |  |  |  |  |  |  | 0.0 |  | 4.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock pursuant to the share repurchase program, at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14.7) |  |  |  | (14.7) |  | (8.9) |  |  |  | (8.9) |  |  |  |  |  |  |
Repurchase of common stock pursuant to the share repurchase program, at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,720.9) |  |  |  | $ (3,720.9) | $ (3,720.9) | $ (2,147.4) |  |  |  | $ (2,147.4) | (2,147.4) |  |  |  |  |  |
Retirement of common stock pursuant to the share repurchase program, at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.7 |  |  | 14.7 |  |  | 8.9 |  |  | 8.9 |  |  |  |  |  |  |
Retirement of common stock pursuant to the share repurchase program, at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ (121.5) | $ (3,599.4) | $ 3,720.9 | 0.0 | $ 0.0 | $ 0.0 | $ (110.5) | $ (2,036.9) | $ 2,147.4 | $ 0.0 |  |  |  |  |  |
Issuance of common stock under stock option and stock purchase plans (in shares) |  |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock option and stock purchase plans | 40.8 |  |  | $ 0.0 | 40.8 |  |  |  |  |  | 40.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock award plan (in shares) |  |  |  | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock award plan | (53.8) |  |  | $ 0.0 |  |  |  | (53.8) |  |  | (53.8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to share-based payments | 191.2 |  |  |  | 191.2 |  |  |  |  |  | 191.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  |  | 0.0 | 198.0 |  |  |  |  |  | 23.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | 13,339.1 |  | $ 0.0 | $ 0.1 | 0.0 | (135.2) |  | 16,455.4 |  | $ (2,977.1) | 13,343.2 |  | (4.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 4,060.5 |  |  |  |  |  |  | 4,000.6 |  |  | 4,000.6 |  | 59.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (162.8) |  |  |  |  | (163.8) |  |  |  |  | (163.8) |  | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution from noncontrolling interest | 4.0 |  |  |  |  |  |  |  |  |  | 0.0 |  | 4.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution to noncontrolling interests | (75.0) |  |  |  |  |  |  |  |  |  |  |  | (75.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock pursuant to the share repurchase program, at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.6) |  |  |  | (1.6) |  | (16.7) |  |  |  | (16.7) |  | (4.1) |  |  |  | (4.1) |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock pursuant to the share repurchase program, at cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (400.0) |  |  |  | $ (400.0) | $ (400.0) | $ (5,000.0) |  |  |  | $ (5,000.0) | $ (5,000.0) | $ (1,279.1) |  |  |  | $ (1,279.1) | (1,279.1) |  |  |  |  |  |  |  |  |  |  |  |
Retirement of common stock pursuant to the share repurchase program, at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.6 |  |  | 1.6 |  |  | 16.7 |  |  | 16.7 |  |  | 4.1 |  |  | 4.1 |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of common stock pursuant to the share repurchase program, at cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 |  | $ (60.8) | $ (339.2) | $ 400.0 |  | $ 0.0 |  | $ (121.3) | $ (4,878.7) | $ 5,000.0 | $ 0.0 | $ 0.0 |  | $ (71.0) | $ (1,208.1) | $ 1,279.1 | $ 0.0 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock option and stock purchase plans (in shares) |  |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock option and stock purchase plans | 49.3 |  |  |  | 49.3 |  |  | 0.0 |  |  | 49.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock award plan (in shares) |  |  |  | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock award plan | (53.7) |  |  |  | 0.0 |  |  | (53.7) |  |  | (53.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to share-based payments | 204.5 |  |  |  | 204.5 |  |  |  |  |  | 204.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | (0.7) |  |  |  | (0.7) |  |  |  |  |  | (0.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2020 |  |  | 0.0 | 176.2 |  |  |  |  |  | 23.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 10,686.1 |  | $ 0.0 | $ 0.1 | $ 0.0 | $ (299.0) |  | $ 13,976.3 |  | $ (2,977.1) | $ 10,700.3 |  | $ (14.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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