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Intangible Assets and Goodwill - Goodwill by Reporting Segment (Details) $ in Millions	12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2022 USD ($) reporting_unit	Mar. 31, 2022 USD ($) unit	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Goodwill By Reporting Segment [Line Items]
Goodwill	$ 6,673.6	$ 6,673.6	$ 6,673.6	$ 6,670.6
Number of reporting units		2	2
Semiconductor Products Reporting Unit
Goodwill By Reporting Segment [Line Items]
Goodwill	6,654.4	$ 6,654.4	$ 6,654.4	6,651.4	$ 6,645.6
Additions	3.0			5.8
Technology Licensing Reporting Unit
Goodwill By Reporting Segment [Line Items]
Goodwill	19.2	$ 19.2	$ 19.2	19.2	$ 19.2
Additions	$ 0.0			$ 0.0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

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X

- Definition

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

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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