Segment Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Segment Information [Abstract]
Net sales		$ 502.2	$ 484.3	$ 1,475.7	$ 1,293.5
Gross profit		$ 74.6	$ 82.7	$ 214.1	$ 209.6
Gross profit (% of sales)		14.90%	17.10%	14.50%	16.20%
Operating income (loss)		$ 79.4	$ (108.7)	$ 98.6	$ (83.4)
Total assets		1,381.4		1,381.4		$ 1,276.7
BHVAC [Member]
Segment Information [Abstract]
Net sales		90.6	73.7	234.7	196.3
CIS [Member]
Segment Information [Abstract]
Net sales		148.6	124.9	456.2	369.6
HDE [Member]
Segment Information [Abstract]
Net sales		200.8	185.6	598.4	474.7
Automotive [Member]
Segment Information [Abstract]
Net sales		72.4	113.9	224.0	285.9
Segment Total [Member]
Segment Information [Abstract]
Net sales		512.4	498.1	1,513.3	1,326.5
Operating Segments [Member]
Segment Information [Abstract]
Net sales		502.2	484.3	1,475.7	1,293.5
Gross profit		$ 74.8	$ 82.7	$ 213.0	$ 210.0
Gross profit (% of sales)		14.60%	16.60%	14.10%	15.80%
Operating income (loss)		$ 83.1	$ (97.9)	$ 125.4	$ (57.1)
Operating Segments [Member] | BHVAC [Member]
Segment Information [Abstract]
Net sales		90.3	73.5	233.1	195.6
Gross profit		$ 27.4	$ 25.4	$ 65.2	$ 64.5
Gross profit (% of sales)		30.30%	34.50%	27.80%	32.90%
Operating income (loss)		$ 14.4	$ 14.9	$ 30.1	$ 35.6
Total assets		213.6		213.6		181.1
Operating Segments [Member] | CIS [Member]
Segment Information [Abstract]
Net sales		146.9	123.5	450.3	365.2
Gross profit		$ 17.7	$ 12.9	$ 56.8	$ 44.8
Gross profit (% of sales)		11.90%	10.30%	12.50%	12.10%
Operating income (loss)		$ 3.4	$ (0.7)	$ 16.7	$ 4.4
Total assets		520.7		520.7		540.1
Operating Segments [Member] | HDE [Member]
Segment Information [Abstract]
Net sales		193.3	173.7	571.0	449.6
Gross profit		$ 22.2	$ 26.0	$ 63.1	$ 60.9
Gross profit (% of sales)		11.10%	14.00%	10.50%	12.80%
Operating income (loss)		$ 10.3	$ 12.8	$ 25.0	$ 23.6
Total assets		473.7		473.7		438.7
Operating Segments [Member] | Automotive [Member]
Segment Information [Abstract]
Net sales		71.7	113.6	221.3	283.1
Gross profit		$ 7.5	$ 18.4	$ 27.9	$ 39.8
Gross profit (% of sales)		10.40%	16.10%	12.40%	13.90%
Operating income (loss)		$ 55.0	$ (124.9)	$ 53.6	$ (120.7)
Total assets		181.6		181.6		124.2
Inter-segment Sales [Member]
Segment Information [Abstract]
Net sales		10.2	13.8	37.6	33.0
Inter-segment Sales [Member] | BHVAC [Member]
Segment Information [Abstract]
Net sales		0.3	0.2	1.6	0.7
Inter-segment Sales [Member] | CIS [Member]
Segment Information [Abstract]
Net sales		1.7	1.4	5.9	4.4
Inter-segment Sales [Member] | HDE [Member]
Segment Information [Abstract]
Net sales		7.5	11.9	27.4	25.1
Inter-segment Sales [Member] | Automotive [Member]
Segment Information [Abstract]
Net sales		0.7	0.3	2.7	2.8
Corporate and Eliminations [Member]
Segment Information [Abstract]
Net sales		(10.2)	(13.8)	(37.6)	(33.0)
Gross profit		$ (0.2)	$ 0.0	$ 1.1	$ (0.4)
Gross profit (% of sales)		0.00%	0.00%	0.00%	0.00%
Operating income (loss)		$ (3.7)	$ (10.8)	$ (26.8)	$ (26.3)
Total assets	[1]	(8.2)		(8.2)		(7.4)
Corporate [Member]
Segment Information [Abstract]
Total assets		$ 21.4		$ 21.4		$ 17.5

[1] At December 31, 2021 and March 31, 2021, Corporate assets totaled $21.4 million and $17.5 million, respectively and were more than offset by eliminations for intercompany balances, including accounts receivable.