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Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Basic and diluted earnings per share

Basic and diluted shares outstanding used in our earnings per share calculation are calculated as follows:

						For the Years Ended December 31,
(In millions)						2022						2021						2020
Numerator:
Net income attributable to Biogen Inc.						$	3,046.9					$	1,556.1					$	4,000.6
Denominator:
Weighted average number of common shares outstanding						145.3						149.1						160.9
Effect of dilutive securities:
Time-vested restricted stock units						0.5						0.3						0.2
Market stock units						0.1						0.1						0.1
Performance stock units settled in stock						0.1						0.1						0.1
Dilutive potential common shares						0.7						0.5						0.4
Shares used in calculating diluted earnings per share						146.0						149.6						161.3

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- References

No definition available.

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

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