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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income attributable to Biogen Inc. $ 4,000.6 $ 5,888.5 $ 4,430.7
Other comprehensive income:      
Unrealized gains (losses) on securities available for sale, net of tax (2.8) 8.2 (3.9)
Unrealized gains (losses) on cash flow hedges, net of tax (186.8) (26.9) 139.2
Gains (losses) on net investment hedges, net of tax (33.6) 21.6 3.5
Unrealized gains (losses) on pension benefit obligation, net of tax (33.5) (1.5) 5.5
Currency translation adjustment 92.9 103.8 (67.8)
Total other comprehensive income (loss), net of tax (163.8) 105.2 76.5
Comprehensive income attributable to Biogen Inc. 3,836.8 5,993.7 4,507.2
Comprehensive income (loss) attributable to noncontrolling interests, net of tax 60.9 (0.4) 42.9
Comprehensive income $ 3,897.7 $ 5,993.3 $ 4,550.1