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v3.21.2

Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Nonoperating Income (Expense) | $ 96.4 | $ 63.0 | $ (410.5) | $ (57.5)
Income Tax Expense (Benefit) | (409.1) | 446.1 | (364.9) | 738.2
Product revenues | 2,775.0 | 3,681.6 | 5,469.0 | 7,215.9
Net income attributable to Biogen Inc. | 448.5 | 1,542.1 | 858.7 | 2,941.2
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. | (27.6) | 27.7 | (49.0) | 42.5
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) | 3.9 | (0.9) | (12.5)
Income Tax Expense (Benefit) | 0.1 | (0.8) | 0.2 | 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) | (0.1) | 0.1 | 0.1 | 0.2
Income Tax Expense (Benefit) | 3.0 | (0.1) | 5.3 | (0.2)
Product revenues | 30.7 | 23.7 | 53.8 | 50.7
Operating Expenses | 0.4 | 0.0 | 0.0 | (0.1)
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) | $ 0.1 | $ 0.9 | $ 0.1 | $ 1.8

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