CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 317.7	$ 334.0	$ 664.9	$ 680.1
Cost of sales	270.0	288.3	555.2	577.4
Gross profit	47.7	45.7	109.7	102.7
Selling, general and administrative expenses	48.7	76.8	93.3	119.6
Restructuring expenses	2.1	1.0	4.4	3.6
Gain on sale of facility	(1.2)	0.0	(1.2)	0.0
Operating (loss) income	(1.9)	(32.1)	13.2	(20.5)
Interest expense	(3.0)	(2.7)	(6.0)	(5.5)
Other expense - net	(0.1)	(0.1)	(0.3)	(0.1)
(Loss) earnings before income taxes	(5.0)	(34.9)	6.9	(26.1)
Benefit (provision) for income taxes	1.0	12.4	(2.0)	9.1
Net (loss) earnings	(4.0)	(22.5)	4.9	(17.0)
Net earnings attributable to noncontrolling interest	(0.1)	0.0	(0.4)	(0.4)
Net (loss) earnings attributable to Modine	$ (4.1)	$ (22.5)	$ 4.5	$ (17.4)
Net (loss) earnings per share attributable to Modine shareholders:
Basic (in dollars per share)	$ (0.09)	$ (0.47)	$ 0.09	$ (0.37)
Diluted (in dollars per share)	$ (0.09)	$ (0.47)	$ 0.09	$ (0.37)
Weighted-average shares outstanding:
Basic (in shares)	47.1	47.4	47.0	47.4
Diluted (in shares)	47.1	47.4	47.3	47.4