CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 2,297.9	$ 2,050.1	$ 1,808.4
Cost of sales	1,908.5	1,740.8	1,515.0
Gross profit	389.4	309.3	293.4
Selling, general and administrative expenses	234.0	215.1	210.9
Restructuring expenses	5.0	24.1	13.4
Impairment charges (reversals) - net	0.0	(55.7)	166.8
Loss on sale of assets	0.0	6.6	0.0
Operating income (loss)	150.4	119.2	(97.7)
Interest expense	(20.7)	(15.6)	(19.4)
Other expense - net	(4.4)	(2.1)	(2.2)
Earnings (loss) before income taxes	125.3	101.5	(119.3)
Benefit (provision) for income taxes	28.3	(15.2)	(90.2)
Net earnings (loss)	153.6	86.3	(209.5)
Net earnings attributable to noncontrolling interest	(0.5)	(1.1)	(1.2)
Net earnings (loss) attributable to Modine	$ 153.1	$ 85.2	$ (210.7)
Net earnings (loss) per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 2.93	$ 1.64	$ (4.11)
Diluted (in dollars per share)	$ 2.9	$ 1.62	$ (4.11)
Weighted-average shares outstanding:
Basic (in shares)	52.3	52.0	51.3
Diluted (in shares)	52.8	52.5	51.3