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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income attributable to Biogen Inc.	$ 4,430.7	$ 2,539.1	$ 3,702.8
Other comprehensive income:
Unrealized gains (losses) recognized during the period, net of tax	(10.6)	(3.5)	(10.6)
Less: reclassification adjustment for (gains) losses included in net income, net of tax	6.7	12.7	0.6
Unrealized gains (losses) on securities available for sale, net of tax	(3.9)	9.2	(10.0)
Unrealized gains (losses) recognized during the period, net of tax	97.4	(193.8)	51.6
Less: reclassification adjustment for (gains) losses included in net income, net of tax	41.8	31.5	(4.0)
Unrealized gains (losses) on cash flow hedges, net of tax	139.2	(162.3)	47.6
Gains (Losses) on net investment hedge recognized during period	5.0	0.0	0.0
Less: Reclassification of net investment hedge forward points amortization	(1.5)	0.0	0.0
Gains (losses) on net investment hedges	3.5	0.0	0.0
Unrealized gains (losses) on pension benefit obligation, net of tax	5.5	(4.1)	5.1
Currency translation adjustment	(67.8)	158.7	(138.6)
Total other comprehensive income (loss), net of tax	76.5	1.5	(95.9)
Comprehensive income attributable to Biogen Inc.	4,507.2	2,540.6	3,606.9
Comprehensive income (loss) attributable to noncontrolling interests, net of tax	(42.9)	(131.0)	7.1
Comprehensive income	$ 4,550.1	$ 2,671.6	$ 3,599.8

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