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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Pre-tax effect of share-based compensation | $ 42.4 | $ 40.7
Income tax benefit | 9.1 | 9.1
Net income effect of share-based compensation | 33.3 | 31.6
Inventory |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Capitalized share-based compensation expense | 4.0 | 4.8
Share-based compensation expense previously capitalized | 6.4 | 4.9
Cost of sales |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Pre-tax effect of share-based compensation | 6.4 | 4.9
Research and development |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Pre-tax effect of share-based compensation | 20.5 | 19.5
Selling, general and administrative |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Pre-tax effect of share-based compensation | $ 15.5 | $ 16.3

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