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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 44.8 | $ 44.0 | $ 134.7 | $ 126.5
Income tax benefit | 9.4 | 9.4 | 28.4 | 27.0
Net income effect of share-based compensation | 35.4 | 34.6 | 106.3 | 99.5
Inventory |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Capitalized share-based compensation expense | 4.7 | 5.0 | 14.6 | 14.5
Share-based compensation expense previously capitalized | 6.0 | 6.9 | 20.2 | 21.1
Cost of sales |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 6.0 | 6.9 | 20.2 | 21.1
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 24.4 | 21.2 | 71.0 | 61.1
Selling, general and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 14.4 | $ 15.9 | $ 43.5 | $ 44.3

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