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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
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