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Condensed Consolidated Statement of Equity Statement - USD ($) shares in Millions, $ in Millions | Total | Preferred stock | Common stock | Additional paid-in capital | Accumulated Other Comprehensive Income | Retained earnings | Treasury stock | Noncontrolling interest | Parent | 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 | 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 | Accounting Standards Update 2016-01 Accumulated Other Comprehensive Income | Accounting Standards Update 2016-16 Retained earnings
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 12,598.1 | $ 0.0 | $ 0.1 | $ 97.8 | $ (318.4) | $ 15,810.4 | $ (2,977.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, shares at Dec. 31, 2017 |  | 0.0 | (235.3) |  |  |  | (23.8) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 | 12,612.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 |  |  |  |  |  |  |  | $ (14.7) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Biogen Inc. | 1,172.9 |  |  |  |  | 1,172.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interest, net of tax | (1.7) |  |  |  |  |  |  | (1.7) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,171.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 13.0 |  |  |  | 13.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 13.2 |  |  |  |  |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock, at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (250.0) |  |  |  | $ (250.0) |  |
Repurchase of common stock, at cost, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.9) |  |  |  | (0.9) |  |
Retirement of common stock pursuant to Share Repurchase Progams, at cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ (122.9) | $ (127.1) | $ (250.0) |  |
Retirement of common stock pursuant to Share Repurchase Programs, at cost, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.9) |  |  | (0.9) |  |
Issuance of common stock under stock option and stock purchase plans | 16.2 |  | $ 0.0 | 16.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock option and stock purchase plans, shares |  |  | 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under award plan |  |  | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock award plan | (37.8) |  | $ 0.0 | (37.8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation related to share-based payments | 46.7 |  |  | 46.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting guidance | 479.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.5 | $ 478.4
Ending balance at Mar. 31, 2018 | 14,037.5 | $ 0.0 | $ 0.1 | 0.0 | (303.9) | 17,334.6 | $ (2,977.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2018 | 14,053.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2018 |  |  |  |  |  |  |  | (16.2) |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, shares at Mar. 31, 2018 |  | 0.0 | (234.8) |  |  |  | (23.8) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 13,031.6 | $ 0.0 | $ 0.1 | 0.0 | (240.4) | 16,257.0 | $ (2,977.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, shares at Dec. 31, 2018 |  | 0.0 | (221.0) |  |  |  | (23.8) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 13,039.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | (8.0) |  |  |  |  |  |  | (8.0) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Biogen Inc. | 1,408.8 |  |  |  |  | 1,408.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interest, net of tax | 0.0 |  |  |  |  |  |  | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,408.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 20.6 |  |  |  | 20.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 20.6 |  |  |  |  |  |  | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, increase (decrease) other | 0.1 |  |  |  |  |  |  | 0.1 | $ 0.0 |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock, at cost |  |  |  |  |  |  |  |  |  | $ (655.8) |  |  |  | $ (655.8) |  |  |  |  |  |  |
Repurchase of common stock, at cost, shares |  |  |  |  |  |  |  |  |  | (2.4) |  |  |  | (2.4) |  |  |  |  |  |  |
Retirement of common stock pursuant to Share Repurchase Progams, at cost |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ (65.6) | $ (590.2) | $ (655.8) |  |  |  |  |  |  |
Retirement of common stock pursuant to Share Repurchase Programs, at cost, shares |  |  |  |  |  |  |  |  |  |  | (2.4) |  |  | (2.4) |  |  |  |  |  |  |
Issuance of common stock under stock option and stock purchase plans | 16.6 |  | $ 0.0 | 16.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock option and stock purchase plans, shares |  |  | 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under award plan |  |  | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under stock award plan | (48.9) |  | $ 0.0 | 0.0 |  | (48.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation related to share-based payments | 49.0 |  |  | 49.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | 13,822.0 | $ 0.0 | $ 0.1 | $ 0.0 | $ (219.8) | $ 17,026.7 | $ (2,977.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | 13,829.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | $ (7.9) |  |  |  |  |  |  | $ (7.9) |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, shares at Mar. 31, 2019 |  | 0.0 | (219.0) |  |  |  | (23.8) |  |  |  |  |  |  |  |  |  |  |  |  |  |

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