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v3.3.1.900

Consolidated Statements of Equity - USD ($) $ in Millions | Total | Total Biogen Inc. shareholders' equity | Preferred stock | Common stock | Additional paid-in capital | Accumulated other comprehensive income (loss) | Retained earnings | Treasury stock | Noncontrolling interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2012 | $ (6,963.8) | $ (6,961.5) | $ 0.0 | $ (0.1) | $ (3,854.5) | $ 55.3 | $ (4,486.8) | $ (1,324.6) | $ (2.3)
Beginning Balance, shares at Dec. 31, 2012 |  |  | 0 | (254,200,000) |  |  |  | (17,700,000) |
Net income | 1,862.3 | 1,862.3 |  |  |  |  | 1,862.3 |  | 0.0
Other comprehensive income, net of tax | 27.6 | 27.6 |  |  |  | 27.6 |  |  | 0.0
Deconsolidation of noncontrolling interests | 1.7 | 0.0 |  |  |  |  |  |  | 1.7
Repurchase of common stock, at cost | (400.3) | (400.3) |  |  |  |  |  | $ (400.3) |
Repurchase of common stock, at cost, shares |  |  |  |  |  |  |  | (2,000,000) |
Issuance of common stock under stock option and stock purchase plans | 66.7 | 66.7 |  | $ 0.0 | 66.7 |  |  |  |
Issuance of common stock under stock option and stock purchase plans, shares |  |  |  | 800,000 |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised | (89.7) | (89.7) |  | $ 0.0 | (89.7) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 1,000,000 |  |  |  |  |
Compensation expense related to share-based payments | 146.2 | 146.2 |  |  | 146.2 |  |  |  |
Tax benefit from share-based payments | 45.9 | 45.9 |  |  | 45.9 |  |  |  |
Ending Balance at Dec. 31, 2013 | (8,620.8) | (8,620.2) | $ 0.0 | $ (0.1) | (4,023.6) | (27.7) | (6,349.1) | $ (1,724.9) | (0.6)
Ending Balance, shares at Dec. 31, 2013 |  |  | 0 | (256,000,000) |  |  |  | (19,700,000) |
Net income | 2,941.6 | 2,934.8 |  |  |  |  | 2,934.8 |  | 6.8
Other comprehensive income, net of tax | 31.8 | 31.8 |  |  |  | 31.8 |  |  | 0.0
Distribution to noncontrolling interests | (9.1) | 0.0 |  |  |  |  |  |  | (9.1)
Acquisition of noncontrolling interests | 6.7 | 0.0 |  |  |  |  |  |  | 6.7
Repurchase of common stock, at cost | $ (886.8) | (886.8) |  |  |  |  |  | $ (886.8) |
Repurchase of common stock, at cost, shares | (2,900,000) |  |  |  |  |  |  | (2,900,000) |
Issuance of common stock under stock option and stock purchase plans | $ 54.9 | 54.9 |  | $ 0.0 | 54.9 |  |  |  |
Issuance of common stock under stock option and stock purchase plans, shares |  |  |  | 300,000 |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised | (140.3) | (140.3) |  | $ 0.0 | (140.3) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 800,000 |  |  |  |  |
Compensation expense related to share-based payments | 165.0 | 165.0 |  |  | 165.0 |  |  |  |
Tax benefit from share-based payments | 93.0 | 93.0 |  |  | 93.0 |  |  |  |
Ending Balance at Dec. 31, 2014 | (10,814.0) | (10,809.0) | $ 0.0 | $ (0.1) | (4,196.2) | (59.5) | (9,283.9) | $ (2,611.7) | (5.0)
Ending Balance, shares at Dec. 31, 2014 |  |  | 0 | (257,100,000) |  |  |  | (22,600,000) |
Net income | 3,593.2 | 3,547.0 |  |  |  |  | 3,547.0 |  | 46.2
Other comprehensive income, net of tax | (164.5) | (164.5) |  |  |  | (164.5) |  |  | 0.0
Distribution to noncontrolling interests | (60.0) | 0.0 |  |  |  |  |  |  | (60.0)
Acquisition of noncontrolling interests | 10.9 | 0.0 |  |  |  |  |  |  | 10.9
Repurchase of common stock, at cost | $ (5,000.0) | (5,000.0) |  |  |  |  |  | $ (5,000.0) |
Repurchase of common stock, at cost, shares | (16,800,000) |  |  |  |  |  |  | (16,800,000) |
Retirement of common stock pursuant to the 2015 Share Repurchase Program, at cost | $ 0.0 | 0.0 |  | $ 0.0 | 4,377.5 |  | 622.5 | $ 5,000.0 |
Retirement of common stock pursuant to the 2015 Share Repurchase Program, at cost, shares |  |  |  | 16,800,000 |  |  |  | 16,800,000 |
Issuance of common stock under stock option and stock purchase plans | 54.2 | 54.2 |  | $ 0.0 | 54.2 |  |  |  |
Issuance of common stock under stock option and stock purchase plans, shares |  |  |  | 300,000 |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised | $ (125.1) | (125.1) |  | $ 0.0 | (125.1) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 114,000 |  |  | 600,000 |  |  |  |  |
Compensation expense related to share-based payments | $ 183.2 | 183.2 |  |  | 183.2 |  |  |  |
Tax benefit from share-based payments | 69.0 | 69.0 |  |  | 69.0 |  |  |  |
Ending Balance at Dec. 31, 2015 | $ (9,374.9) | $ (9,372.8) | $ 0.0 | $ (0.1) | $ 0.0 | $ (224.0) | $ (12,208.4) | $ (2,611.7) | $ (2.1)
Ending Balance, shares at Dec. 31, 2015 |  |  | 0 | (241,200,000) |  |  |  | (22,600,000) |

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