CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Net sales	$ 461.4	$ 500.2	$ 809.2	$ 1,029.2
Cost of sales	380.6	424.5	682.3	870.1
Gross profit	80.8	75.7	126.9	159.1
Selling, general and administrative expenses	50.8	67.4	95.5	130.9
Restructuring expenses	1.5	2.3	6.1	4.1
Operating income	28.5	6.0	25.3	24.1
Interest expense	(5.2)	(5.8)	(10.6)	(11.7)
Other expense - net	(0.5)	(1.3)	(0.5)	(2.4)
Earnings (loss) before income taxes	22.8	(1.1)	14.2	10.0
Provision for income taxes	(13.9)	(3.7)	(13.7)	(6.6)
Net earnings (loss)	8.9	(4.8)	0.5	3.4
Net (earnings) loss attributable to noncontrolling interest	(0.3)	0.1	(0.5)	(0.1)
Net earnings (loss) attributable to Modine	$ 8.6	$ (4.7)	$ 0.0	$ 3.3
Net earnings (loss) per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 0.17	$ (0.09)	$ 0	$ 0.07
Diluted (in dollars per share)	$ 0.17	$ (0.09)	$ 0	$ 0.06
Weighted-average shares outstanding:
Basic (in shares)	51.3	50.8	51.1	50.8
Diluted (in shares)	51.3	50.8	51.1	51.1