CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 478.9	$ 461.4	$ 973.5	$ 809.2
Cost of sales	412.6	380.6	834.0	682.3
Gross profit	66.3	80.8	139.5	126.9
Selling, general and administrative expenses	51.9	50.8	111.3	95.5
Restructuring expenses	0.6	1.5	0.9	6.1
Impairment charges - net	3.3	0.0	1.5	0.0
Loss on sale of assets	0.0	0.0	6.6	0.0
Operating income	10.5	28.5	19.2	25.3
Interest expense	(3.8)	(5.2)	(8.0)	(10.6)
Other expense - net	(0.7)	(0.5)	(0.5)	(0.5)
Earnings before income taxes	6.0	22.8	10.7	14.2
Provision for income taxes	(5.4)	(13.9)	(7.3)	(13.7)
Net earnings	0.6	8.9	3.4	0.5
Net earnings attributable to noncontrolling interest	(0.2)	(0.3)	(0.7)	(0.5)
Net earnings attributable to Modine	$ 0.4	$ 8.6	$ 2.7	$ 0.0
Net earnings per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 0.01	$ 0.17	$ 0.05	$ 0
Diluted (in dollars per share)	$ 0.01	$ 0.17	$ 0.05	$ 0
Weighted-average shares outstanding:
Basic (in shares)	52.0	51.3	51.9	51.1
Diluted (in shares)	52.6	51.3	52.5	51.1