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v3.21.2

Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Nonoperating Income (Expense) | $ (502.9) | $ (128.6) | $ (913.4) | $ (186.1)
Income Tax Expense (Benefit) | (25.9) | 240.8 | (390.7) | 979.0
Product revenues | 2,778.9 | 3,376.1 | 8,247.9 | 10,592.0
Net income attributable to Biogen Inc. | 329.2 | 701.5 | 1,187.9 | 3,642.7
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net income attributable to Biogen Inc. | (14.0) | (6.6) | (63.0) | 35.9
Unrealized gains (losses) on securities available for sale | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Nonoperating Income (Expense) | (0.4) | 0.1 | (1.3) | (12.4)
Income Tax Expense (Benefit) | 0.1 | 0.0 | 0.3 | 2.6
Unrealized gains (losses) on cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Nonoperating Income (Expense) | 0.0 | 0.0 | 0.1 | 0.2
Income Tax Expense (Benefit) | 1.5 | 0.1 | 6.8 | (0.1)
Product revenues | (14.9) | (9.1) | (68.7) | 41.6
Operating Expenses | (0.3) | 1.5 | (0.3) | 1.4
Gains (losses) on net investment hedge | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Nonoperating Income (Expense) | $ 0.0 | $ 0.8 | $ 0.1 | $ 2.6

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