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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Net income attributable to Biogen Inc. | $ 5,888.5 | $ 4,430.7 | $ 2,539.1
Other comprehensive income: |  |  |
Unrealized gains (losses) recognized during the period, net of tax | 11.8 | (10.6) | (3.5)
Less: reclassification adjustment for (gains) losses included in net income, net of tax | (3.6) | 6.7 | 12.7
Unrealized gains (losses) on securities available for sale, net of tax | 8.2 | (3.9) | 9.2
Unrealized gains (losses) recognized during the period, net of tax | 88.1 | 97.4 | (193.8)
Less: reclassification adjustment for (gains) losses included in net income, net of tax | (115.0) | 41.8 | 31.5
Unrealized gains (losses) on cash flow hedges, net of tax | (26.9) | 139.2 | (162.3)
Gains (Losses) on net investment hedge recognized during period | 28.6 | 5.0 | 0.0
Less: Reclassification of net investment hedge forward points amortization | (7.0) | (1.5) | 0.0
Gains (losses) on net investment hedges | 21.6 | 3.5 | 0.0
Unrealized gains (losses) on pension benefit obligation, net of tax | (1.5) | 5.5 | (4.1)
Currency translation adjustment | 103.8 | (67.8) | 158.7
Total other comprehensive income (loss), net of tax | 105.2 | 76.5 | 1.5
Comprehensive income attributable to Biogen Inc. | 5,993.7 | 4,507.2 | 2,540.6
Comprehensive income (loss) attributable to noncontrolling interests, net of tax | 0.4 | (42.9) | (131.0)
Comprehensive income | $ 5,993.3 | $ 4,550.1 | $ 2,671.6

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