XML 133 R49.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Earnings per Share (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
Earnings Per Share [Abstract] |
Basic and diluted earnings per share |
| For the Years Ended December 31,
(In millions) | 2013 |  | 2012 |  | 2011
Numerator: |  |  |  |  |
Net income attributable to Biogen Idec Inc. | $ | 1,862.3 |  |  | $ | 1,380.0 |  |  | $ | 1,234.4 |
Adjustment for net income allocable to preferred stock | — |  |  | — |  |  | (0.5 | )
Net income used in calculating basic and diluted earnings per share | $ | 1,862.3 |  |  | $ | 1,380.0 |  |  | $ | 1,233.9 |
Denominator: |  |  |  |  |
Weighted average number of common shares outstanding | 236.9 |  |  | 237.9 |  |  | 242.4 |
Effect of dilutive securities: |  |  |  |  |
Stock options and employee stock purchase plan | 0.3 |  |  | 0.5 |  |  | 1.0 |
Time-vested restricted stock units | 0.8 |  |  | 1.0 |  |  | 1.3 |
Market stock units | 0.3 |  |  | 0.3 |  |  | 0.3 |
Dilutive potential common shares | 1.4 |  |  | 1.8 |  |  | 2.6 |
Shares used in calculating diluted earnings per share | 238.3 |  |  | 239.7 |  |  | 245.0 |

X
- 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration