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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Pre-tax effect of share-based compensation $ 56.6 $ 42.4
Income tax benefit 12.0 9.1
Net income effect of share-based compensation 44.6 33.3
Inventory    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Capitalized share-based compensation expense 5.6 4.0
Share-based compensation expense previously capitalized 8.8 6.4
Cost of sales    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Pre-tax effect of share-based compensation 8.8 6.4
Research and development    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Pre-tax effect of share-based compensation 26.6 20.5
Selling, general and administrative    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Pre-tax effect of share-based compensation $ 21.2 $ 15.5