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Share-Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based compensation expense included in consolidated statements of income |
| For the Years Ended December 31,
(In millions) | 2013 |  | 2012 |  | 2011
Research and development | $ | 95.6 |  |  | $ | 74.7 |  |  | $ | 62.0 |
Selling, general and administrative | 160.3 |  |  | 109.6 |  |  | 88.7 |
Restructuring charges | — |  |  | — |  |  | (0.6 | )
Subtotal | 255.9 |  |  | 184.3 |  |  | 150.1 |
Capitalized share-based compensation costs | (9.8 | ) |  | (5.4 | ) |  | (4.5 | )
Share-based compensation expense included in total cost and expenses | 246.1 |  |  | 178.9 |  |  | 145.6 |
Income tax effect | (73.3 | ) |  | (53.4 | ) |  | (44.6 | )
Share-based compensation expense included in net income attributable to Biogen Idec Inc. | $ | 172.8 |  |  | $ | 125.5 |  |  | $ | 101.0 |
Summary of share-based compensation expense associated with each of our share-based compensating programs |
| For the Years Ended December 31,
(In millions) | 2013 |  | 2012 |  | 2011
Stock options | $ | 0.6 |  |  | $ | 2.3 |  |  | $ | 5.9 |
Market stock units | 32.8 |  |  | 23.3 |  |  | 14.6 |
Time-vested restricted stock units | 103.5 |  |  | 93.0 |  |  | 89.6 |
Performance-vested restricted stock units settled in shares | — |  |  | 0.1 |  |  | 1.0 |
Cash settled performance shares | 109.8 |  |  | 60.4 |  |  | 32.7 |
Employee stock purchase plan | 9.2 |  |  | 5.2 |  |  | 6.3 |
Subtotal | 255.9 |  |  | 184.3 |  |  | 150.1 |
Capitalized share-based compensation costs | (9.8 | ) |  | (5.4 | ) |  | (4.5 | )
Share-based compensation expense included in total cost and expenses | $ | 246.1 |  |  | $ | 178.9 |  |  | $ | 145.6 |
Stock option activity |
| Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2012 | 907,000 |  |  | $ | 54.48 |
Granted | — |  |  | $ | — |
Exercised | (523,000 | ) |  | $ | 53.73 |
Cancelled | — |  |  | $ | — |
Outstanding at December 31, 2013 | 384,000 |  |  | $ | 55.49 |
Tax benefit and cash received from stock option exercises |
| For the Years Ended December 31,
(In millions) | 2013 |  | 2012 |  | 2011
Tax benefit realized for stock options | $ | 29.4 |  |  | $ | 20.9 |  |  | $ | 47.5 |
Cash received from the exercise of stock options | $ | 28.1 |  |  | $ | 38.8 |  |  | $ | 291.9 |
Market stock units activity |
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2012 | 606,000 |  |  | $ | 94.73 |
Granted (a) | 271,000 |  |  | $ | 193.45 |
Vested | (296,000 | ) |  | $ | 85.12 |
Forfeited | (31,000 | ) |  | $ | 128.39 |
Unvested at December 31, 2013 | 550,000 |  |  | $ | 128.04 |
Assumptions used in valuation of market based stock units |
| For the Years Ended December 31,
| 2013 |  | 2012
Expected dividend yield | —% |  | —%
Range of expected stock price volatility | 21.7% - 25.7% |  | 29.6% - 34.0%
Range of risk-free interest rates | 0.1% - 0.7% |  | 0.2% - 0.6%
60 calendar day average stock price on grant date | $150.33 - $240.14 |  | $113.83 - $149.79
Weighted-average per share grant date fair value | $193.45 |  | $134.95
Cash settled performance shares activity |
| Shares
Unvested at December 31, 2012 | 592,000 |
Granted (a) | 273,000 |
Vested | (317,000 | )
Forfeited | (34,000 | )
Unvested at December 31, 2013 | 514,000 |
Time-vested restricted stock units activity |
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2012 | 2,187,000 |  |  | $ | 90.37 |
Granted (a) | 758,000 |  |  | $ | 176.53 |
Vested | (1,181,000 | ) |  | $ | 79.17 |
Forfeited | (104,000 | ) |  | $ | 119.42 |
Unvested at December 31, 2013 | 1,660,000 |  |  | $ | 135.95 |
Performance-vested restricted stock units activity |
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2012 | 930 |  |  | $ | 53.64 |
Granted | — |  |  | $ | — |
Vested | (930 | ) |  | $ | 53.64 |
Forfeited | — |  |  | $ | — |
Unvested at December 31, 2013 | — |  |  | $ | — |
Shares issued under employee stock purchase plan |
| For the Years Ended December 31,
(In millions, except share amounts) | 2013 |  | 2012 |  | 2011
Shares issued under ESPP | 245,000 |  |  | 274,000 |  |  | 434,000 |
Cash received under ESPP | $ | 38.7 |  |  | $ | 28.7 |  |  | $ | 22.8 |

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