CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Net sales	$ 548.9	$ 508.3	$ 1,115.0	$ 1,023.8
Cost of sales	461.0	422.2	932.8	849.2
Gross profit	87.9	86.1	182.2	174.6
Selling, general and administrative expenses	63.4	62.2	122.7	121.4
Restructuring expenses	0.0	0.4	0.2	2.1
Loss on sale of assets	1.7	0.0	1.7	0.0
Operating income	22.8	23.5	57.6	51.1
Interest expense	(6.5)	(6.6)	(12.7)	(13.2)
Other expense - net	(0.5)	(1.1)	(1.6)	(2.0)
Earnings before income taxes	15.8	15.8	43.3	35.9
Benefit (provision) for income taxes	22.9	0.5	17.9	(2.2)
Net earnings	38.7	16.3	61.2	33.7
Net earnings attributable to noncontrolling interest	(0.2)	(0.4)	(0.7)	(0.8)
Net earnings attributable to Modine	$ 38.5	$ 15.9	$ 60.5	$ 32.9
Net earnings per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 0.76	$ 0.32	$ 1.19	$ 0.66
Diluted (in dollars per share)	$ 0.75	$ 0.31	$ 1.18	$ 0.65
Weighted-average shares outstanding:
Basic (in shares)	50.5	49.8	50.4	49.6
Diluted (in shares)	51.4	50.7	51.3	50.4