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Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Nonoperating Income (Expense) | $ (197.4) | $ (34.5) | $ 159.9 | $ (75.5)
Income Tax Expense (Benefit) | 248.1 | 263.7 | 670.6 | 586.2
Product revenues | (3,616.7) | (3,356.5) | (7,106.5) | (6,487.6)
Net income attributable to Biogen Inc. | 1,494.1 | 866.6 | 2,902.9 | 2,039.5
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. | 31.8 | (10.7) | 48.5 | (48.1)
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) | 0.7 | 0.0 | 1.0 | (7.6)
Income Tax Expense (Benefit) | (0.1) | 0.0 | (0.2) | 1.6
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 | 0.1
Income Tax Expense (Benefit) | (0.1) | 0.1 | (0.2) | 0.2
Product revenues | (29.8) | (10.4) | (44.6) | (43.3)
Operating Expenses | (0.7) | (0.4) | (1.2) | (0.9)
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) | 2.2 | 0.0 | 4.4 | 0.0
Income Tax Expense (Benefit) | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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