Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions	Dec. 31, 2023	Mar. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (4,778.4)	$ (4,344.7)
Gross Amount	7,714.9	7,713.7
Net Amount	2,936.5	3,369.0
Amortization Expense
2024	173.0
2025	557.3
2026	486.6
2027	385.7
2028	$ 300.3
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	$ 7,295.0	7,296.2
Accumulated Amortization	(4,517.8)	(4,103.4)
Net Amount	2,777.2	3,192.8
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Amount	196.7	199.8
Accumulated Amortization	(136.8)	(128.0)
Net Amount	59.9	71.8
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross Amount	223.2	211.7
Accumulated Amortization	(123.8)	(113.0)
Net Amount	$ 99.4	98.7
Distribution rights and other
Finite-Lived Intangible Assets [Line Items]
Gross Amount		0.3
Accumulated Amortization		(0.3)
Net Amount		$ 0.0