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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (5,491.0) $ (5,270.5)
Gross Amount 7,660.5 7,659.5
Net Amount 2,169.5 2,389.0
Amortization Expense    
2026 262.0  
2027 424.6  
2028 317.9  
2029 243.2  
2030 $ 238.0  
In-process research and development    
Finite-Lived Intangible Assets [Line Items]    
In-process research and development   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 $ 7,199.9 7,149.9
Accumulated Amortization (5,172.1) (4,981.6)
Net Amount 2,027.8 2,168.3
Customer-related    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 202.5 199.5
Accumulated Amortization (159.0) (152.8)
Net Amount 43.5 46.7
Software licenses    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 258.1 259.3
Accumulated Amortization (159.9) (136.1)
Net Amount $ 98.2 $ 123.2