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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2021
Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (4,166.5) $ (3,549.6)
Gross Amount 8,422.8 8,344.4
Net Amount 4,256.3 4,794.8
Projected Amortization Expense    
2022 233.1  
2023 743.2  
2024 666.0  
2025 531.0  
2026 $ 459.8  
Minimum    
Projected Amortization Expense    
Useful life 1 year  
Maximum    
Projected Amortization Expense    
Useful life 15 years  
In-process research and development    
Indefinite-lived Intangible Assets [Line Items]    
In-process research and development $ 6.4 7.7
Core and developed technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 7,387.6 7,371.3
Accumulated Amortization (3,374.4) (2,771.0)
Net Amount 4,013.2 4,600.3
Customer-related    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 835.2 835.2
Accumulated Amortization (736.2) (702.6)
Net Amount 99.0 132.6
Distribution rights and other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 193.6 130.2
Accumulated Amortization (55.9) (76.0)
Net Amount $ 137.7 $ 54.2