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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 49.4 | $ 44.8 | $ 139.7 | $ 134.7
Income tax benefit | 10.4 | 9.4 | 29.3 | 28.4
Net income effect of share-based compensation | 39.0 | 35.4 | 110.4 | 106.3
Capitalized share-based compensation expense | 3.6 | 4.7 | 13.6 | 14.6
Share-based compensation expense previously capitalized | 7.4 | 6.0 | 18.3 | 20.2
Cost of sales |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 7.4 | 6.0 | 18.3 | 20.2
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 28.8 | 24.4 | 79.0 | 71.0
Selling, general and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 13.2 | $ 14.4 | $ 42.4 | $ 43.5

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