Intangible Assets and Goodwill - Goodwill by Reporting Segment (Details) $ in Millions	12 Months Ended
Mar. 31, 2026 USD ($) reportingUnit	Mar. 31, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 6,684.8
Ending balance	$ 6,695.5	$ 6,684.8
Number of reporting units \| reportingUnit	2
Semiconductor Products Reporting Unit
Goodwill [Roll Forward]
Beginning balance	$ 6,665.6	6,656.2
Additions	10.7	9.4
Ending balance	6,676.3	6,665.6
Technology Licensing Reporting Unit
Goodwill [Roll Forward]
Beginning balance	19.2	19.2
Additions	0.0	0.0
Ending balance	$ 19.2	$ 19.2

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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+ Details