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Share-Based Compensation (Tables)
 12 Months Ended
Mar. 31, 2021
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):
Fiscal Year Ended March 31,
2021 2020 2019
Cost of sales (1)
$26.6 $20.9 $14.9 
Research and development96.8 82.9 72.0 
Selling, general and administrative74.9 66.4 62.3 
Special charges and other, net— — 17.2 
Pre-tax effect of share-based compensation198.3 170.2 166.4 
Income tax benefit42.3 36.9 35.5 
Net income effect of share-based compensation$156.0  $133.3  $130.9 
 
(1) During the fiscal year ended March 31, 2021, $16.7 million of share-based compensation expense was capitalized to inventory and $26.6 million of previously capitalized share-based compensation expense in inventory was sold. 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.
Schedule of Share-based Compensation, Restricted Stock Units Award 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, 20185,672,440 $50.79 
Granted1,951,408 $77.83 
Assumed upon acquisition1,805,680 $91.70 
Forfeited(408,242)$73.36 
Vested(2,729,324)$61.51 
Nonvested shares at March 31, 20196,291,962 $64.81 
Granted2,182,044 $88.17 
Forfeited(340,659)$75.50 
Vested(2,391,294)$57.47 
Nonvested shares at March 31, 20205,742,053 $76.11 
Granted2,339,247 $101.37 
Forfeited(257,055)$83.37 
Vested(1,882,336)$64.13 
Nonvested shares at March 31, 20215,941,909 $89.54 
Schedule of Share-based Compensation, Stock Options, Activity
Stock option and SARs activity under the Company's stock incentive plans in the three years ended March 31, 2021 is set forth below:
Number of
Shares		Weighted Average Exercise Price per Share
Outstanding at March 31, 2018284,340 $31.21 
Assumed upon acquisition141,751 $25.86 
Exercised(140,118)$27.67 
Forfeited or expired(4,091)$39.62 
Outstanding at March 31, 2019281,882 $30.16 
Exercised(130,419)$28.71 
Forfeited or expired(2,453)$20.02 
Outstanding at March 31, 2020149,010 $31.59 
Exercised(77,884)$31.48 
Forfeited or expired(629)$19.47 
Outstanding at March 31, 202170,497 $31.81