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Share-Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2016
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) | 2016 |  | 2015 |  | 2014
Research and development | $ | 84.5 |  |  | $ | 88.6 |  |  | $ | 102.1 |
Selling, general and administrative | 121.7 |  |  | 127.3 |  |  | 150.3 |
Restructuring charges | (1.8 | ) |  | (8.6 | ) |  | — |
Subtotal | 204.4 |  |  | 207.3 |  |  | 252.4 |
Capitalized share-based compensation costs | (14.6 | ) |  | (11.0 | ) |  | (10.0 | )
Share-based compensation expense included in total cost and expenses | 189.8 |  |  | 196.3 |  |  | 242.4 |
Income tax effect | (54.0 | ) |  | (55.8 | ) |  | (72.2 | )
Share-based compensation expense included in net income attributable to Biogen Inc. | $ | 135.8 |  |  | $ | 140.5 |  |  | $ | 170.2 |
Summary of share-based compensation expense associated with each of our share-based compensating programs |
| For the Years Ended December 31,
(In millions) | 2016 |  | 2015 |  | 2014
Market stock units | $ | 38.4 |  |  | $ | 38.1 |  |  | $ | 37.4 |
Time-vested restricted stock units | 120.0 |  |  | 119.0 |  |  | 115.4 |
Cash settled performance units | 16.3 |  |  | 22.4 |  |  | 65.5 |
Performance units | 18.6 |  |  | 13.9 |  |  | 21.9 |
Employee stock purchase plan | 11.1 |  |  | 13.9 |  |  | 12.2 |
Subtotal | 204.4 |  |  | 207.3 |  |  | 252.4 |
Capitalized share-based compensation costs | (14.6 | ) |  | (11.0 | ) |  | (10.0 | )
Share-based compensation expense included in total cost and expenses | $ | 189.8 |  |  | $ | 196.3 |  |  | $ | 242.4 |
Stock option activity |
| Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2015 | 107,000 |  |  | $ | 53.94 |
Granted | — |  |  | $ | — |
Exercised | (41,000 | ) |  | $ | 53.75 |
Cancelled | — |  |  | $ | — |
Outstanding at December 31, 2016 | 66,000 |  |  | $ | 54.06 |
Tax benefit and cash received from stock option exercises |
| For the Years Ended December 31,
(In millions) | 2016 |  | 2015 |  | 2014
Tax benefit realized for stock options | $ | 4.0 |  |  | $ | 11.9 |  |  | $ | 13.0 |
Cash received from the exercise of stock options | $ | 2.2 |  |  | $ | 6.3 |  |  | $ | 8.5 |
Market stock units activity |
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2015 | 269,000 |  |  | $ | 339.89 |
Granted (a) | 168,000 |  |  | $ | 328.03 |
Vested | (155,000 | ) |  | $ | 244.68 |
Forfeited | (52,000 | ) |  | $ | 371.62 |
Unvested at December 31, 2016 | 230,000 |  |  | $ | 355.60 |
Assumptions used in valuation of market based stock units |
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Expected dividend yield | —% |  | —% |  | —%
Range of expected stock price volatility | 38.2% - 40.7% |  | 31.0% - 33.2% |  | 31.7% - 35.1%
Range of risk-free interest rates | 0.6% - 0.9% |  | 0.2% - 1.0% |  | 0.1% - 0.7%
30 calendar day average stock price on grant date | $260.67 - $304.86 |  | $277.35 - $426.27 |  | $280.88 - $335.65
Weighted-average per share grant date fair value | $328.03 |  | $493.43 |  | $395.22
Cash settled performance shares activity |
| Shares
Unvested at December 31, 2015 | 192,000 |
Granted (a) | 86,000 |
Vested | (117,000 | )
Forfeited | (39,000 | )
Unvested at December 31, 2016 | 122,000 |
Performance units activity |
| Shares
Unvested at December 31, 2015 | 103,000 |
Granted (a) | 55,000 |
Vested | (31,000 | )
Forfeited | (17,000 | )
Unvested at December 31, 2016 | 110,000 |
Time-vested restricted stock units activity |
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2015 | 810,000 |  |  | $ | 323.87 |
Granted (a) | 649,000 |  |  | $ | 268.52 |
Vested | (406,000 | ) |  | $ | 285.13 |
Forfeited | (165,000 | ) |  | $ | 310.30 |
Unvested at December 31, 2016 | 888,000 |  |  | $ | 303.49 |
Shares issued under employee stock purchase plan |
| For the Years Ended December 31,
(In millions, except share amounts) | 2016 |  | 2015 |  | 2014
Shares issued under the 2015 ESPP | 190,000 |  |  | 78,000 |  |  | **
Shares issued under the 1995 ESPP | — |  |  | 98,000 |  |  | 180,000 |
Cash received under the 2015 ESPP | $ | 41.5 |  |  | $ | 19.3 |  |  | **
Cash received under the 1995 ESPP | $ | — |  |  | $ | 30.0 |  |  | $ | 46.4 |

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