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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (3,968.3) $ (3,549.6)
Gross Amount 8,448.1 8,344.4
Net Amount 4,479.8 4,794.8
Projected Amortization Expense    
2022 468.2  
2023 742.6  
2024 663.7  
2025 528.6  
2026 $ 458.1  
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 7,386.2 7,371.3
Accumulated Amortization (3,172.3) (2,771.0)
Net Amount 4,213.9 4,600.3
Customer-related    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 835.2 835.2
Accumulated Amortization (725.0) (702.6)
Net Amount 110.2 132.6
Distribution rights and other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 220.3 130.2
Accumulated Amortization (71.0) (76.0)
Net Amount $ 149.3 $ 54.2