CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Net sales	$ 512.7	$ 349.8	$ 1,536.5	$ 1,014.7
Cost of sales	427.3	290.8	1,276.5	845.4
Gross profit	85.4	59.0	260.0	169.3
Selling, general and administrative expenses	60.8	50.7	182.2	143.1
Restructuring expenses	9.4	1.6	11.5	6.0
Impairment charge	1.3	0.0	1.3	0.0
Gain on sale of facility	0.0	0.0	0.0	(1.2)
Operating income	13.9	6.7	65.0	21.4
Interest expense	(6.3)	(4.5)	(19.5)	(10.5)
Other expense - net	(0.3)	(1.0)	(2.3)	(2.8)
Earnings before income taxes	7.3	1.2	43.2	8.1
(Provision) benefit for income taxes	(35.2)	0.7	(37.4)	(1.3)
Net (loss) earnings	(27.9)	1.9	5.8	6.8
Net earnings attributable to noncontrolling interest	(0.4)	(0.2)	(1.2)	(0.6)
Net (loss) earnings attributable to Modine	$ (28.3)	$ 1.7	$ 4.6	$ 6.2
Net (loss) earnings per share attributable to Modine shareholders:
Basic (in dollars per share)	$ (0.57)	$ 0.04	$ 0.09	$ 0.13
Diluted (in dollars per share)	$ (0.57)	$ 0.04	$ 0.09	$ 0.13
Weighted-average shares outstanding:
Basic (in shares)	50.0	47.9	49.8	47.3
Diluted (in shares)	50.0	48.5	50.6	47.7