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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Pre-tax effect of share-based compensation $ 44.8 $ 44.0 $ 134.7 $ 126.5
Income tax benefit 9.4 9.4 28.4 27.0
Net income effect of share-based compensation 35.4 34.6 106.3 99.5
Inventory        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Capitalized share-based compensation expense 4.7 5.0 14.6 14.5
Share-based compensation expense previously capitalized 6.0 6.9 20.2 21.1
Cost of sales        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Pre-tax effect of share-based compensation 6.0 6.9 20.2 21.1
Research and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Pre-tax effect of share-based compensation 24.4 21.2 71.0 61.1
Selling, general and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Pre-tax effect of share-based compensation $ 14.4 $ 15.9 $ 43.5 $ 44.3