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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 51.2 | $ 43.5 | $ 143.3 | $ 129.5
Income tax benefit | 10.7 | 9.2 | 30.5 | 28.2
Net income effect of share-based compensation | 40.5 | 34.3 | 112.8 | 101.3
Inventory |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Capitalized share-based compensation expense | 4.5 | 5.1 | 11.9 | 15.4
Share-based compensation expense previously capitalized | 6.4 | 5.7 | 18.8 | 15.8
Cost of sales |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 6.4 | 5.7 | 18.8 | 15.8
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | 25.0 | 21.2 | 70.0 | 63.0
Selling, general and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Pre-tax effect of share-based compensation | $ 19.8 | $ 16.6 | $ 54.5 | $ 50.7

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