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Share-Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Share-based compensation expense included in consolidated statements of income | The following table summarizes share-based compensation expense included in our consolidated statements of income:
|  | For the Years Ended December 31,
(In millions) |  | 2020 |  | 2019 |  | 2018
Research and development |  | $ | 80.0 |  |  | $ | 77.1 |  |  | $ | 75.8 |
Selling, general and administrative |  | 131.3 |  |  | 148.3 |  |  | 105.8 |
Subtotal |  | 211.3 |  |  | 225.4 |  |  | 181.6 |
Capitalized share-based compensation costs |  | (6.2) |  |  | (8.9) |  |  | (11.5) |
Share-based compensation expense included in total cost and expenses |  | 205.1 |  |  | 216.5 |  |  | 170.1 |
Income tax effect |  | (33.5) |  |  | (35.7) |  |  | (27.5) |
Share-based compensation expense included in net income attributable to Biogen Inc. |  | $ | 171.6 |  |  | $ | 180.8 |  |  | $ | 142.6 |
Summary of share-based compensation expense associated with each of our share-based compensating programs | The following table summarizes share-based compensation expense associated with each of our share-based compensation programs:
|  | For the Years Ended December 31,
(In millions) |  | 2020 |  | 2019 |  | 2018
Market stock units |  | $ | 40.5 |  |  | $ | 30.4 |  |  | $ | 27.2 |
Time-vested restricted stock units |  | 142.6 |  |  | 134.0 |  |  | 126.6 |
Cash settled performance units |  | (1.7) |  |  | 0.7 |  |  | 7.8 |
Performance units |  | (0.1) |  |  | 1.6 |  |  | 3.1 |
Performance stock units settled in stock |  | 7.9 |  |  | 15.5 |  |  | 4.7 |
Performance stock units settled in cash |  | 8.6 |  |  | 5.5 |  |  | 1.7 |
Employee stock purchase plan |  | 13.5 |  |  | 11.5 |  |  | 10.5 |
NST stock options |  | — |  |  | 26.2 |  |  | — |
Subtotal |  | 211.3 |  |  | 225.4 |  |  | 181.6 |
Capitalized share-based compensation costs |  | (6.2) |  |  | (8.9) |  |  | (11.5) |
Share-based compensation expense included in total cost and expenses |  | $ | 205.1 |  |  | $ | 216.5 |  |  | $ | 170.1 |
Stock option activity | The following table summarizes our stock option activity:
| Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2019 | 12,000 |  |  | $ | 58.46 |
Granted | — |  |  | — |
Exercised | (12,000) |  |  | 58.46 |
Cancelled | — |  |  | — |
Outstanding at December 31, 2020 | — |  |  | $ | — |
Tax benefit and cash received from stock option exercises | The following table summarizes the amount of tax benefit realized for stock options and cash received from the exercise of stock options:
|  | For the Years Ended December 31,
(In millions) |  | 2020 |  | 2019 |  | 2018
Tax benefit realized for stock options |  | $ | 2.9 |  |  | $ | 2.5 |  |  | $ | 2.2 |
Cash received from the exercise of stock options |  | 0.7 |  |  | 0.4 |  |  | 0.8 |
Market stock units activity | The following table summarizes our MSU activity:
|  | December 31, 2020
|  | Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2019 |  | 183,000 |  |  | $ | 378.09 |
Granted (1) |  | 133,000 |  |  | 398.61 |
Vested |  | (82,000) |  |  | 375.42 |
Forfeited |  | (33,000) |  |  | 402.62 |
Unvested at December 31, 2020 |  | 201,000 |  |  | $ | 388.98 |
(1) MSUs granted during 2020 include awards granted in conjunction with our annual awards made in February 2020 and MSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant. MSUs granted in 2020 also reflect an adjustment based upon the final performance multiplier in relation to shares granted in 2019, 2018 and 2017.
Assumptions used in valuation of market based stock units | The assumptions used in our valuation are summarized as follows:
|  | For the Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Expected dividend yield |  | —% |  | —% |  | —%
Range of expected stock price volatility |  | 37.8% - 44.1% |  | 31.2% - 33.6% |  | 27.5% - 32.4%
Range of risk-free interest rates |  | 1.41% - 1.48% |  | 2.46% - 2.53% |  | 1.9% - 2.3%
30 calendar day average stock price on grant date |  | $257.83 - $325.40 |  | $228.59 - $331.18 |  | $279.47 - $346.76
Weighted-average per share grant date fair value |  | $398.61 |  | $378.08 |  | $378.85
Cash settled performance shares activity | The following table summarizes our CSPU activity:
| Shares
Unvested at December 31, 2019 | 13,000 |
Granted | — |
Vested | (13,000) |
Forfeited | — |
Unvested at December 31, 2020 | — |
Performance units activity | The following table summarizes our PU activity:
| Shares
Unvested at December 31, 2019 | 11,000 |
Granted | — |
Vested | (11,000) |
Forfeited | — |
Unvested at December 31, 2020 | — |
Performance stock units settled in stock activity | The following table summarizes our PSUs that settle in stock activity:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2019 | 111,000 |  |  | $ | 316.39 |
Granted (1) | 73,000 |  |  | 293.35 |
Vested | — |  |  | — |
Forfeited | (29,000) |  |  | 323.42 |
Unvested at December 31, 2020 | 155,000 |  |  | $ | 304.19 |
(1) PSUs settled in stock granted in 2020 include awards granted in conjunction with our annual awards made in February 2020 and PSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
Performance stock units settled in cash activity | The following table summarizes our PSUs that settle in cash activity:
| Shares
Unvested at December 31, 2019 | 82,000 |
Granted (1) | 63,000 |
Vested | (2,000) |
Forfeited | (23,000) |
Unvested at December 31, 2020 | 120,000 |
(1) PSUs settled in cash granted in 2020 include awards granted in conjunction with our annual awards made in February 2020 and PSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
Time-vested restricted stock units activity | The following table summarizes our RSU activity:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2019 | 938,000 |  |  | $ | 306.55 |
Granted (1) | 620,000 |  |  | 318.87 |
Vested | (440,000) |  |  | 304.45 |
Forfeited | (100,000) |  |  | 314.46 |
Unvested at December 31, 2020 | 1,018,000 |  |  | $ | 314.46 |
(1) RSUs granted in 2020 primarily represent RSUs granted in conjunction with our annual awards made in February 2020 and awards made in conjunction with the hiring of new employees. RSUs granted in 2020 also include approximately 10,000 RSUs granted to our Board of Directors.
Shares issued under employee stock purchase plan | The following table summarizes our ESPP activity:
|  | For the Years Ended December 31,
(In millions, except share amounts) |  | 2020 |  | 2019 |  | 2018
Shares issued under the 2015 ESPP |  | 212,000 |  |  | 204,000 |  |  | 170,000 |
Cash received under the 2015 ESPP |  | $ | 48.6 |  |  | $ | 40.4 |  |  | $ | 40.5 |

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