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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (5,383.7) $ (5,270.5)
Gross Amount 7,675.9 7,659.5
Net Amount 2,292.2 2,389.0
Amortization Expense    
2026 395.1  
2027 425.0  
2028 320.0  
2029 246.8  
2030 239.8  
In-process research and development    
Finite-Lived Intangible Assets [Line Items]    
In-process research and development $ 50.8 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 $ 7,161.5 7,149.9
Accumulated Amortization (5,082.5) (4,981.6)
Net Amount 2,079.0 2,168.3
Customer-related    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 202.5 199.5
Accumulated Amortization (155.9) (152.8)
Net Amount 46.6 46.7
Software licenses    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 261.1 259.3
Accumulated Amortization (145.3) (136.1)
Net Amount $ 115.8 $ 123.2