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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Mar. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (4,612.0) $ (4,344.7)
Gross Amount 7,700.8 7,713.7
Net Amount 3,088.8 3,369.0
Amortization Expense    
2024 343.9  
2025 554.9  
2026 485.3  
2027 383.6  
2028 $ 297.9  
Minimum    
Amortization Expense    
Useful life 1 year  
Maximum    
Amortization Expense    
Useful life 15 years  
In-process research and development    
Indefinite-lived Intangible Assets [Line Items]    
In-process research and development   5.7
Core and developed technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 7,285.0 7,296.2
Accumulated Amortization (4,371.9) (4,103.4)
Net Amount 2,913.1 3,192.8
Customer-related    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 196.7 199.8
Accumulated Amortization (132.8) (128.0)
Net Amount 63.9 71.8
Software licenses    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 219.1 211.7
Accumulated Amortization (107.3) (113.0)
Net Amount $ 111.8 98.7
Distribution rights and other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount   0.3
Accumulated Amortization   (0.3)
Net Amount   $ 0.0