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Geographic and Segment Information - Long-Lived Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Amount of identifiable long-lived assets (consisting of property, plant and equipment) | $ 996.7 | $ 767.9 |
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Amount of identifiable long-lived assets (consisting of property, plant and equipment) | 521.1 | 393.3 |
Thailand |  |  |
Segment Reporting Information [Line Items] |  |  |
Amount of identifiable long-lived assets (consisting of property, plant and equipment) | 209.3 | 215.5 |
Various Other Countries |  |  |
Segment Reporting Information [Line Items] |  |  |
Amount of identifiable long-lived assets (consisting of property, plant and equipment) | $ 266.3 | $ 159.1 |
Sales Revenue, Net | Geographic Concentration Risk | Located outside US, in aggregate |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 80.00% | 85.00% | 84.00%
Sales Revenue, Net | Geographic Concentration Risk | Europe |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 23.00% | 24.00% | 24.00%
Sales Revenue, Net | Geographic Concentration Risk | Asia |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 52.00% | 58.00% | 58.00%
Sales Revenue, Net | Geographic Concentration Risk | China |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 22.00% | 30.00% | 32.00%
Sales Revenue, Net | Geographic Concentration Risk | Taiwan |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 13.00% | 11.00% | 9.00%

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