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Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Nonoperating Income (Expense) | $ 63.0 | $ (197.4) | $ (57.5) | $ 159.9
Income Tax Expense (Benefit) | 446.1 | 248.1 | 738.2 | 670.6
Product revenues | (3,681.6) | (3,616.7) | (7,215.9) | (7,106.5)
Net income attributable to Biogen Inc. | 1,542.1 | 1,494.1 | 2,941.2 | 2,902.9
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. | 27.7 | 31.8 | 42.5 | 48.5
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) | 3.9 | 0.7 | (12.5) | 1.0
Income Tax Expense (Benefit) | (0.8) | (0.1) | 2.6 | (0.2)
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 | 0.0 | 0.2 | 0.1
Income Tax Expense (Benefit) | (0.1) | (0.1) | (0.2) | (0.2)
Product revenues | (23.7) | 29.8 | (50.7) | 44.6
Operating Expenses | 0.0 | (0.7) | (0.1) | 1.2
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) | $ 0.9 | $ 2.2 | $ 1.8 | $ 4.4

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