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