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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (5,270.5) $ (4,866.9)
Gross Amount 7,659.5 7,648.7
Net Amount 2,389.0 2,781.8
Amortization Expense    
2026 520.8  
2027 423.7  
2028 313.9  
2029 240.4  
2030 236.7  
In-process research and development    
Finite-Lived Intangible Assets [Line Items]    
In-process research and development 50.8  
Purchased intangible assets, indefinite-lived $ 50.8  
Minimum    
Amortization Expense    
Useful life 1 year  
Maximum    
Amortization Expense    
Useful life 15 years  
Core and developed technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 7,149.9 7,221.3
Accumulated Amortization (4,981.6) (4,590.9)
Net Amount 2,168.3 2,630.4
Customer-related    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 199.5 196.7
Accumulated Amortization (152.8) (140.8)
Net Amount 46.7 55.9
Purchased intangible assets, finite-lived 2.8  
Software licenses    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 259.3 230.7
Accumulated Amortization (136.1) (135.2)
Net Amount 123.2 $ 95.5
Purchased intangible assets, finite-lived $ 1.1