Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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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.

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Geographic and Segment Information - Gross Profit (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Segment reporting information [Line Items]
Net Sales	$ 1,326.4	$ 1,287.4	$ 1,337.8	$ 1,322.6	$ 1,329.8	$ 1,374.7	$ 1,432.5	$ 1,212.5	$ 5,274.2	$ 5,349.5	$ 3,980.8
Gross Profit	$ 813.9	$ 785.5	$ 827.5	$ 815.2	$ 820.5	$ 779.6	$ 689.3	$ 642.0	3,242.1	2,931.3	2,420.7
Semiconductor products
Segment reporting information [Line Items]
Net Sales									5,177.3	5,217.1	3,876.0
Gross Profit									3,145.2	2,798.9	2,315.9
Technology licensing
Segment reporting information [Line Items]
Net Sales									96.9	132.4	104.8
Gross Profit									$ 96.9	$ 132.4	$ 104.8