CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 473.4	$ 541.0	$ 1,502.6	$ 1,656.0
Cost of sales	399.9	449.3	1,270.0	1,382.1
Gross profit	73.5	91.7	232.6	273.9
Selling, general and administrative expenses	63.5	57.2	194.4	179.9
Restructuring expenses	2.6	0.5	6.7	0.7
Impairment charge	0.0	0.4	0.0	0.4
(Gain) loss on sale of assets	(0.8)	0.0	(0.8)	1.7
Operating income	8.2	33.6	32.3	91.2
Interest expense	(5.6)	(6.2)	(17.3)	(18.9)
Other income (expense) - net	0.1	(0.5)	(2.3)	(2.1)
Earnings before income taxes	2.7	26.9	12.7	70.2
(Provision) benefit for income taxes	(1.7)	(8.6)	(8.3)	9.3
Net earnings	1.0	18.3	4.4	79.5
Net loss (earnings) attributable to noncontrolling interest	0.2	(0.3)	0.1	(1.0)
Net earnings attributable to Modine	$ 1.2	$ 18.0	$ 4.5	$ 78.5
Net earnings per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 0.02	$ 0.36	$ 0.09	$ 1.55
Diluted (in dollars per share)	$ 0.02	$ 0.35	$ 0.09	$ 1.53
Weighted-average shares outstanding:
Basic (in shares)	50.8	50.5	50.8	50.4
Diluted (in shares)	51.1	51.2	51.1	51.2