Segment and Geographic Information, Property, Plant and Equipment by Geographical Area (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Segment and Geographic Information [Abstract]
Property, plant and equipment	[1]	$ 315.4	$ 269.9
Impairment charges (reversals) - net		(55.7)	166.8	$ 8.6
Liquid-Cooled Automotive Business [Member]
Segment and Geographic Information [Abstract]
Impairment charges (reversals) - net		(56.0)
Reportable Geographical Component [Member] | United States [Member]
Segment and Geographic Information [Abstract]
Property, plant and equipment		83.6	80.3
Reportable Geographical Component [Member] | China [Member]
Segment and Geographic Information [Abstract]
Property, plant and equipment		45.6	31.3
Reportable Geographical Component [Member] | Hungary [Member]
Segment and Geographic Information [Abstract]
Property, plant and equipment		44.0	27.6
Reportable Geographical Component [Member] | Mexico [Member]
Segment and Geographic Information [Abstract]
Property, plant and equipment		38.5	43.5
Reportable Geographical Component [Member] | Italy [Member]
Segment and Geographic Information [Abstract]
Property, plant and equipment		33.2	30.0
Reportable Geographical Component [Member] | Germany [Member]
Segment and Geographic Information [Abstract]
Property, plant and equipment		12.5	1.8
Reportable Geographical Component [Member] | Other [Member]
Segment and Geographic Information [Abstract]
Property, plant and equipment		$ 58.0	$ 55.4

[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.