CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 349.8	$ 328.7	$ 1,014.7	$ 1,008.8
Cost of sales	291.1	270.1	846.3	847.5
Gross profit	58.7	58.6	168.4	161.3
Selling, general and administrative expenses	51.1	43.3	144.4	162.9
Restructuring expenses	1.6	1.6	6.0	5.2
Gain on sale of facility	0.0	0.0	(1.2)	0.0
Operating income (loss)	6.0	13.7	19.2	(6.8)
Interest expense	(4.5)	(2.7)	(10.5)	(8.2)
Other expense - net	(0.3)	(0.4)	(0.6)	(0.5)
Earnings (loss) before income taxes	1.2	10.6	8.1	(15.5)
Benefit (provision) for income taxes	0.7	(2.4)	(1.3)	6.7
Net earnings (loss)	1.9	8.2	6.8	(8.8)
Net earnings attributable to noncontrolling interest	(0.2)	0.0	(0.6)	(0.4)
Net earnings (loss) attributable to Modine	$ 1.7	$ 8.2	$ 6.2	$ (9.2)
Net earnings (loss) per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 0.04	$ 0.17	$ 0.13	$ (0.19)
Diluted (in dollars per share)	$ 0.04	$ 0.17	$ 0.13	$ (0.19)
Weighted-average shares outstanding:
Basic (in shares)	47.9	47.4	47.3	47.4
Diluted (in shares)	48.5	47.8	47.7	47.4