Geographic and Segment Information - Long-Lived Assets and Concentration Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total long-lived assets	$ 1,009.0	$ 995.6
Sales | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage of net sales to unaffiliated customers		10.00%	10.00%
United States
Segment Reporting Information [Line Items]
Total long-lived assets	516.6	$ 515.0
Thailand
Segment Reporting Information [Line Items]
Total long-lived assets	178.1	174.4
Various other countries
Segment Reporting Information [Line Items]
Total long-lived assets	$ 314.3	$ 306.2
Located outside US, in aggregate | Sales | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of net sales to unaffiliated customers	77.00%	78.00%	80.00%
Europe | Sales | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of net sales to unaffiliated customers	19.00%	22.00%	23.00%
Asia | Sales | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of net sales to unaffiliated customers	55.00%	52.00%	52.00%
China | Sales | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of net sales to unaffiliated customers	22.00%	21.00%	22.00%
Taiwan | Sales | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of net sales to unaffiliated customers	16.00%	15.00%	13.00%