CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 2,050.1	$ 1,808.4	$ 1,975.5
Cost of sales	1,740.8	1,515.0	1,668.0
Gross profit	309.3	293.4	307.5
Selling, general and administrative expenses	215.1	210.9	249.6
Restructuring expenses	24.1	13.4	12.2
Impairment charges (reversals) - net	(55.7)	166.8	8.6
Loss (gain) on sale of assets	6.6	0.0	(0.8)
Operating income (loss)	119.2	(97.7)	37.9
Interest expense	(15.6)	(19.4)	(22.7)
Other expense - net	(2.1)	(2.2)	(4.8)
Earnings (loss) before income taxes	101.5	(119.3)	10.4
Provision for income taxes	(15.2)	(90.2)	(12.4)
Net earnings (loss)	86.3	(209.5)	(2.0)
Net earnings attributable to noncontrolling interest	(1.1)	(1.2)	(0.2)
Net earnings (loss) attributable to Modine	$ 85.2	$ (210.7)	$ (2.2)
Net earnings (loss) per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 1.64	$ (4.11)	$ (0.04)
Diluted (in dollars per share)	$ 1.62	$ (4.11)	$ (0.04)
Weighted-average shares outstanding:
Basic (in shares)	52.0	51.3	50.8
Diluted (in shares)	52.5	51.3	50.8