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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 49.7 | $ 45.3 | $ 92.1 | $ 86.0
Income tax benefit | 10.7 | 9.9 | 19.8 | 19.0
Net income effect of share-based compensation | 39.0 | 35.4 | 72.3 | 67.0
Inventory |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Capitalized share-based compensation expense | 3.4 | 5.5 | 7.4 | 10.3
Share-based compensation expense previously capitalized | 6.0 | 5.2 | 12.4 | 10.1
Cost of sales |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 6.0 | 5.2 | 12.4 | 10.1
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 24.5 | 22.3 | 45.0 | 41.8
Selling, general and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 19.2 | $ 17.8 | $ 34.7 | $ 34.1

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