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Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Segment reporting information [Line Items] |  |  |  |
Net Sales | $ 1,287.4 | $ 1,374.7 | $ 3,947.8 | $ 4,019.7
Gross Profit | 785.5 | 779.6 | 2,428.2 | 2,110.9
Semiconductor products |  |  |  |
Segment reporting information [Line Items] |  |  |  |
Net Sales | 1,257.0 | 1,331.3 | 3,875.6 | 3,911.4
Gross Profit | 755.1 | 736.2 | 2,356.0 | 2,002.6
Technology licensing |  |  |  |
Segment reporting information [Line Items] |  |  |  |
Net Sales | 30.4 | 43.4 | 72.2 | 108.3
Gross Profit | $ 30.4 | $ 43.4 | $ 72.2 | $ 108.3

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