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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 55.7 | $ 49.7 | $ 112.3 | $ 92.1
Income tax benefit | 11.8 | 10.7 | 23.8 | 19.8
Net income effect of share-based compensation | 43.9 | 39.0 | 88.5 | 72.3
Inventory |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Capitalized share-based compensation expense | 5.5 | 3.4 | 11.1 | 7.4
Share-based compensation expense previously capitalized | 9.1 | 6.0 | 17.9 | 12.4
Cost of sales |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 9.1 | 6.0 | 17.9 | 12.4
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 26.1 | 24.5 | 52.7 | 45.0
Selling, general and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 20.5 | $ 19.2 | $ 41.7 | $ 34.7

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