CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 494.6	$ 347.8
Cost of sales	421.4	301.7
Gross profit	73.2	46.1
Selling, general and administrative expenses	59.4	44.7
Restructuring expenses	0.3	4.6
Impairment charges (reversals) - net	(1.8)	0.0
Loss on sale of assets	6.6	0.0
Operating income (loss)	8.7	(3.2)
Interest expense	(4.2)	(5.4)
Other income - net	0.2	0.0
Earnings (loss) before income taxes	4.7	(8.6)
(Provision) benefit for income taxes	(1.9)	0.2
Net earnings (loss)	2.8	(8.4)
Net earnings attributable to noncontrolling interest	(0.5)	(0.2)
Net earnings (loss) attributable to Modine	$ 2.3	$ (8.6)
Net earnings (loss) per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 0.04	$ (0.17)
Diluted (in dollars per share)	$ 0.04	$ (0.17)
Weighted-average shares outstanding:
Basic (in shares)	51.8	50.9
Diluted (in shares)	52.5	50.9