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v3.23.1

Share-Based Compensation - Equity Incentive Plans, Stock Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Pre-tax effect of share-based compensation | $ 170.4 | $ 210.2 | $ 198.3
Income tax benefit | 36.4 | 44.6 | 42.3
Net income effect of share-based compensation | $ 134.0 | 165.6 | 156.0
Minimum | Market-based Performance Shares |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Shares expected to received at vesting, percent | 0.00% |  |
Measurement period | 2 years |  |
Minimum | Performance Shares |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Shares expected to received at vesting, percent | 0.00% |  |
Measurement period | 2 years |  |
Maximum | Market-based Performance Shares |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Shares expected to received at vesting, percent | 200.00% |  |
Measurement period | 3 years |  |
Maximum | Performance Shares |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Shares expected to received at vesting, percent | 200.00% |  |
Measurement period | 3 years |  |
2004 Plan |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Shares authorized (in shares) | 64,389,717 |  |
Number of shares available for grant (in shares) | 8,728,867 |  |
Amortization expense charged to cost of sales |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Pre-tax effect of share-based compensation | $ 27.2 | 34.3 | 26.6
Research and development |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Pre-tax effect of share-based compensation | 83.1 | 97.9 | 96.8
Selling, general and administrative |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Pre-tax effect of share-based compensation | 60.1 | 78.0 | 74.9
Inventory |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Capitalized share-based compensation expense | 19.7 | 21.2 | 16.7
Share-based compensation expense previously capitalized | $ 27.2 | $ 34.3 | $ 26.6

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