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Share-Based Compensation - Equity Incentive Plans, Stock Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 61.6 | $ 46.3 | $ 114.5 | $ 90.3
Income tax benefit | 12.8 | 9.7 | 23.7 | 18.9
Net income effect of share-based compensation | 48.8 | 36.6 | 90.8 | 71.4
Capitalized share-based compensation expense | 5.9 | 5.0 | 9.5 | 10.0
Share-based compensation expense previously capitalized | 8.3 | 4.3 | 16.0 | 10.9
Amortization expense charged to cost of sales |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 8.3 | 4.3 | 16.0 | 10.9
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 33.2 | 26.9 | 62.3 | 50.2
Selling, general and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 20.1 | $ 15.1 | $ 36.2 | $ 29.2

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