Segment and Geographic Information, Total Assets by Segment (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Segment and Geographic Information [Abstract]
Total assets		$ 1,427.0	$ 1,276.7
Impairment charges (reversals) - net		(55.7)	166.8	$ 8.6
CIS [Member]
Segment and Geographic Information [Abstract]
Impairment charges (reversals) - net		0.3		0.6
Automotive [Member]
Segment and Geographic Information [Abstract]
Impairment charges (reversals) - net		(56.0)	166.8	$ 7.5
Operating Segments [Member] | BHVAC [Member]
Segment and Geographic Information [Abstract]
Total assets		224.3	181.1
Operating Segments [Member] | CIS [Member]
Segment and Geographic Information [Abstract]
Total assets		536.4	540.1
Operating Segments [Member] | HDE [Member]
Segment and Geographic Information [Abstract]
Total assets		488.9	438.7
Operating Segments [Member] | Automotive [Member]
Segment and Geographic Information [Abstract]
Total assets	[1]	188.6	124.2
Corporate and Eliminations [Member]
Segment and Geographic Information [Abstract]
Total assets	[2]	(11.2)	(7.4)
Corporate [Member]
Segment and Geographic Information [Abstract]
Total assets		$ 20.8	$ 17.5

[1] During fiscal 2022, the Company recorded net impairment reversals totaling $56.0 million  related to the liquid-cooled automotive business.  See Note 2 for additional information.

[2] At March 31, 2022 and 2021, Corporate assets totaled $20.8 million and $17.5 million, respectively and were more than offset by eliminations for intercompany balances, including accounts receivable.