XML 59 R34.htm IDEA: XBRL DOCUMENT
v3.23.1

Earnings per Share (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2023
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 Three Months Ended March 31, |  |
(In millions) |  | 2023 |  | 2022 |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net income attributable to Biogen Inc. |  | $ | 387.9 |  |  | $ | 303.8 |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  | 144.4 |  |  | 147.1 |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Time-vested restricted stock units |  | 0.6 |  |  | 0.3 |  |  |  |  |
Market stock units |  | 0.1 |  |  | 0.1 |  |  |  |  |
Performance stock units settled in stock |  | 0.1 |  |  | 0.1 |  |  |  |  |
Dilutive potential common shares |  | 0.8 |  |  | 0.5 |  |  |  |  |
Shares used in calculating diluted earnings per share |  | 145.2 |  |  | 147.6 |  |  |  |  |

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 + Details
Name: | us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration