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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income attributable to Biogen Inc. $ 410.2 $ 1,399.1
Other comprehensive income:    
Unrealized gains (losses) on securities available for sale, net of tax (0.8) (7.8)
Unrealized gains (losses) on cash flow hedges, net of tax 149.6 33.8
Gains (losses) on net investment hedges 22.4 23.0
Unrealized gains (losses) on pension benefit obligation, net of tax 2.0 0.8
Currency translation adjustment (48.5) (63.9)
Total other comprehensive income (loss), net of tax 124.7 (14.1)
Comprehensive income attributable to Biogen Inc. 534.9 1,385.0
Comprehensive income (loss) attributable to noncontrolling interests, net of tax (4.9) (5.9)
Comprehensive income (loss) attributable to noncontrolling interests, net of tax $ 530.0 $ 1,379.1