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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited)
(In millions, except per share amounts)First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter		Total
Year
2020
Product revenues, net$2,904.6 $2,795.7 $2,690.3 $2,301.6 $10,692.2 
Revenues from anti-CD20 therapeutic programs$520.4 $478.3 $560.1 $419.0 $1,977.8 
Other revenues$109.3 $407.6 $125.7 $132.0 $774.6 
Total revenues$3,534.3 $3,681.6 $3,376.1 $2,852.6 $13,444.6 
Gross profit (1)
$3,080.0 $3,270.5 $2,927.0 $2,361.9 $11,639.4 
Net income$1,392.6 $1,606.5 $703.9 $357.6 $4,060.5 
Net income attributable to Biogen Inc.$1,399.1 $1,542.1 $701.5 $357.9 $4,000.6 
Net income per share:
Basic earnings per share attributable to Biogen Inc.$8.10 $9.60 $4.47 $2.33 $24.86 
Diluted earnings per share attributable to Biogen Inc.$8.08 $9.59 $4.46 $2.32 $24.80 
Weighted-average shares used in calculating:
Basic earnings per share attributable to Biogen Inc.172.8 160.6 156.9 153.7 160.9 
Diluted earnings per share attributable to Biogen Inc.173.1 160.9 157.2 154.0 161.3 
(In millions, except per share amounts)First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter		Total
Year
2019 
Product revenues, net$2,680.0 $2,880.3 $2,894.7 $2,924.8 $11,379.8 
Revenues from anti-CD20 therapeutic programs$517.4 $576.4 $595.8 $600.8 $2,290.4 
Other revenues$292.4 $160.0 $109.6 $145.7 $707.7 
Total revenues$3,489.8 $3,616.7 $3,600.1 $3,671.3 $14,377.9 
Gross profit (1)
$2,887.8 $3,140.4 $3,170.1 $3,224.2 $12,422.5 
Net income$1,408.8 $1,494.1 $1,545.9 $1,439.7 $5,888.5 
Net income attributable to Biogen Inc.$1,408.8 $1,494.1 $1,545.9 $1,439.7 $5,888.5 
Net income per share:
Basic earnings per share attributable to Biogen Inc.$7.17 $7.85 $8.40 $8.10 $31.47 
Diluted earnings per share attributable to Biogen Inc.$7.15 $7.85 $8.39 $8.08 $31.42 
Weighted-average shares used in calculating:
Basic earnings per share attributable to Biogen Inc.196.6 190.3 184.0 177.8 187.1 
Diluted earnings per share attributable to Biogen Inc.197.0 190.4 184.2 178.2 187.4 
(1) Gross profit is calculated as total revenues less cost of sales, excluding amortization and impairment of acquired intangible assets.