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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 46.3 | $ 45.4 | $ 90.3 | $ 89.9
Income tax benefit | 9.7 | 9.6 | 18.9 | 19.0
Net income effect of share-based compensation | 36.6 | 35.8 | 71.4 | 70.9
Inventory |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Capitalized share-based compensation expense | 5.0 | 4.7 | 10.0 | 9.9
Share-based compensation expense previously capitalized | 4.3 | 7.4 | 10.9 | 14.2
Cost of sales |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 4.3 | 7.4 | 10.9 | 14.2
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 26.9 | 23.7 | 50.2 | 46.6
Selling, general and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 15.1 | $ 14.3 | $ 29.2 | $ 29.1

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