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Net Sales (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,322.6 | $ 1,212.5
Distributors |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 665.1 | 645.7
Direct customers |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 638.9 | 540.1
Licensees |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 18.6 | 26.7
Microcontrollers |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 708.3 | 722.5
Analog, interface, mixed signal and timing products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 386.4 | 331.9
Field-programmable gate array products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 91.0 | 37.8
Licensing, memory and other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 136.9 | $ 120.3

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