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Share-Based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Share-based Compensation Expense | The following table presents the details of the Company's share-based compensation expense (in millions):
| Year Ended March 31,
| 2020 |  | 2019 |  | 2018
Cost of sales (1) | $ | 20.9 |  |  | $ | 14.9 |  |  | $ | 13.8 |
Research and development | 82.9 |  |  | 72.0 |  |  | 42.5 |
Selling, general and administrative | 66.4 |  |  | 62.3 |  |  | 36.9 |
Special charges and other, net | — |  |  | 17.2 |  |  | — |
Pre-tax effect of share-based compensation | 170.2 |  |  | 166.4 |  |  | 93.2 |
Income tax benefit | 36.9 |  |  | 35.5 |  |  | 28.3 |
Net income effect of share-based compensation | $ | 133.3 |  |  | $ | 130.9 |  |  | $ | 64.9 |
(1) During the fiscal year ended March 31, 2020, $19.8 million of share-based compensation expense was capitalized to inventory, and $20.9 million of previously capitalized share-based compensation expense in inventory was sold. During the fiscal year ended March 31, 2019, $17.2 million of share-based compensation expense was capitalized to inventory and $14.9 million of previously capitalized share-based compensation expense in inventory was sold. During the fiscal year ended March 31, 2018, $11.9 million of share-based compensation expense was capitalized to inventory and $13.8 million of previously capitalized share-based compensation expense in inventory was sold.
Share-based Payment Arrangement, Restricted Stock Unit, Activity | RSU share activity under the 2004 Plan is set forth below:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested shares at March 31, 2017 | 6,419,456 |  |  | $ | 42.06 |
Granted | 1,267,536 |  |  | $ | 77.26 |
Forfeited | (279,051 | ) |  | $ | 49.65 |
Vested | (1,735,501 | ) |  | $ | 38.00 |
Nonvested shares at March 31, 2018 | 5,672,440 |  |  | $ | 50.79 |
Granted | 1,951,408 |  |  | $ | 77.83 |
Assumed upon acquisition | 1,805,680 |  |  | $ | 91.70 |
Forfeited | (408,242 | ) |  | $ | 73.36 |
Vested | (2,729,324 | ) |  | $ | 61.51 |
Nonvested shares at March 31, 2019 | 6,291,962 |  |  | $ | 64.81 |
Granted | 2,182,044 |  |  | $ | 88.17 |
Forfeited | (340,659 | ) |  | $ | 75.50 |
Vested | (2,391,294 | ) |  | $ | 57.47 |
Nonvested shares at March 31, 2020 | 5,742,053 |  |  | $ | 76.11 |
Share-based Payment Arrangement, Option, Activity | Stock option and stock appreciation right (SAR) activity under the Company's stock incentive plans in the three years ended March 31, 2020 is set forth below:
| Number of Shares |  | Weighted Average Exercise Price per Share
Outstanding at March 31, 2017 | 433,117 |  |  | $ | 31.51 |
Exercised | (131,666 | ) |  | $ | 31.75 |
Forfeited or expired | (17,111 | ) |  | $ | 34.73 |
Outstanding at March 31, 2018 | 284,340 |  |  | $ | 31.21 |
Assumed upon acquisition | 141,751 |  |  | $ | 25.86 |
Exercised | (140,118 | ) |  | $ | 27.67 |
Forfeited or expired | (4,091 | ) |  | $ | 39.62 |
Outstanding at March 31, 2019 | 281,882 |  |  | $ | 30.16 |
Exercised | (130,419 | ) |  | $ | 28.71 |
Forfeited or expired | (2,453 | ) |  | $ | 20.02 |
Outstanding at March 31, 2020 | 149,010 |  |  | $ | 31.59 |

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