CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 500.2	$ 548.9	$ 1,029.2	$ 1,115.0
Cost of sales	424.5	461.0	870.1	932.8
Gross profit	75.7	87.9	159.1	182.2
Selling, general and administrative expenses	67.4	63.4	130.9	122.7
Restructuring expenses	2.3	0.0	4.1	0.2
Loss on sale of assets	0.0	1.7	0.0	1.7
Operating income	6.0	22.8	24.1	57.6
Interest expense	(5.8)	(6.5)	(11.7)	(12.7)
Other expense - net	(1.3)	(0.5)	(2.4)	(1.6)
(Loss) earnings before income taxes	(1.1)	15.8	10.0	43.3
(Provision) benefit for income taxes	(3.7)	22.9	(6.6)	17.9
Net (loss) earnings	(4.8)	38.7	3.4	61.2
Net loss (earnings) attributable to noncontrolling interest	0.1	(0.2)	(0.1)	(0.7)
Net (loss) earnings attributable to Modine	$ (4.7)	$ 38.5	$ 3.3	$ 60.5
Net (loss) earnings per share attributable to Modine shareholders:
Basic (in dollars per share)	$ (0.09)	$ 0.76	$ 0.07	$ 1.19
Diluted (in dollars per share)	$ (0.09)	$ 0.75	$ 0.06	$ 1.18
Weighted-average shares outstanding:
Basic (in shares)	50.8	50.5	50.8	50.4
Diluted (in shares)	50.8	51.4	51.1	51.3