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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income attributable to Biogen Inc. $ 1,408.8 $ 1,172.9
Other comprehensive income:    
Unrealized gains (losses) on securities available for sale, net of tax 6.9 (2.2)
Unrealized gains (losses) on cash flow hedges, net of tax 16.9 (29.0)
Gain (losses) on net investment hedge 14.0 0.0
Unrealized gains (losses) on pension benefit obligation, net of tax 0.6 (0.5)
Currency translation adjustment (17.8) 44.7
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 20.6 13.0
Comprehensive income attributable to Biogen Inc. 1,429.4 1,185.9
Comprehensive income (loss) attributable to noncontrolling interests, net of tax 0.0 (1.7)
Comprehensive income $ 1,429.4 $ 1,184.2