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Intangible Assets and Goodwill - Goodwill by Reporting Segment (Details) $ in Millions	12 Months Ended
	Mar. 31, 2025 USD ($) reporting_unit	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 6,675.4
Ending balance	$ 6,684.8	$ 6,675.4
Number of reporting units | reporting_unit	2
Semiconductor Products Reporting Unit
Goodwill [Roll Forward]
Beginning balance	$ 6,656.2	6,654.4
Additions	9.4	1.8
Ending balance	6,665.6	6,656.2
Technology Licensing Reporting Unit
Goodwill [Roll Forward]
Beginning balance	19.2	19.2
Additions	0.0	0.0
Ending balance	$ 19.2	$ 19.2

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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