Significant Accounting Policies, Tooling and Research and Development (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Tooling [Abstract]
Property, plant and equipment - net	[1]	$ 315.4	$ 269.9
Customer owned tooling receivable		12.3	8.1
Research and Development [Abstract]
Research and development cost		$ 50.3	46.3	$ 59.5
Held for Sale [Member]
Tooling [Abstract]
Customer owned tooling receivable			5.6
Tooling [Member]
Tooling [Abstract]
Property, plant and equipment, depreciable lives		3 years
Property, plant and equipment - net		$ 18.3	$ 14.1

[1] As of March 31, 2021, the Company had written-down the carrying value of held for sale property, plant and equipment within the liquid-cooled automotive business to zero.  During fiscal 2022, the business no longer met the requirements to be classified as held for sale.  As a result, the Company remeasured its long-lived assets to the lower of carrying value or fair value and recorded net impairment reversals totaling $56.0 million during fiscal 2022.  The assets within the liquid-cooled automotive business are located in Hungary, Germany, China, the U.S., Italy, and the Netherlands.  See Note 2 for additional information.