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Significant Accounting Policies, Tooling and Research and Development (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Tooling [Abstract]
Property, plant and equipment - net	[1]	$ 269.9	$ 448.0
Customer owned tooling receivable		8.1	7.8
Research and Development [Abstract]
Research and development cost		46.3	59.5	$ 69.8
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		$ 14.1	$ 23.3
[1] In connection with the pending sales of the liquid- and air-cooled automotive businesses within the Automotive segment, the Company wrote-down the carrying value of the disposal groups’ property, plant and equipment to zero as of March 31, 2021.  The assets impaired were located in Hungary, Germany, Austria, China, the U.S., Italy, and the Netherlands.  See Note 2 for additional information on the held for sale businesses and impairment charges recorded during fiscal 2021.

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Amount of cost reimbursement receivable related to customer-owned tooling.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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