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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (3,745.4)	$ (3,549.6)
Gross Amount	7,788.5	8,344.4
Net Amount	4,043.1	4,794.8
Amortization Expense
2023	746.1
2024	667.1
2025	533.1
2026	462.6
2027	$ 377.2
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	$ 6.4	7.7
Core and developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Amount	7,390.2	7,371.3
Accumulated Amortization	(3,571.5)	(2,771.0)
Net Amount	3,818.7	4,600.3
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Amount	200.3	835.2
Accumulated Amortization	(112.4)	(702.6)
Net Amount	87.9	132.6
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross Amount	191.2	124.6
Accumulated Amortization	(61.2)	(70.9)
Net Amount	130.0	53.7
Distribution rights and other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	0.4	5.6
Accumulated Amortization	(0.3)	(5.1)
Net Amount	$ 0.1	$ 0.5

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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