Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Segment reporting information [Line Items]
Net Sales	$ 1,757.5	$ 1,352.1	$ 4,976.7	$ 3,971.3
Gross Profit	1,153.3	845.8	3,229.2	2,452.0
Semiconductor products
Segment reporting information [Line Items]
Net Sales	1,725.5	1,319.9	4,884.5	3,893.9
Gross Profit	1,121.3	813.6	3,137.0	2,374.6
Technology licensing
Segment reporting information [Line Items]
Net Sales	32.0	32.2	92.2	77.4
Gross Profit	$ 32.0	$ 32.2	$ 92.2	$ 77.4