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