CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Net sales	$ 541.0	$ 512.7	$ 1,656.0	$ 1,536.5
Cost of sales	449.3	427.3	1,382.1	1,276.5
Gross profit	91.7	85.4	273.9	260.0
Selling, general and administrative expenses	57.2	60.8	179.9	182.2
Restructuring expenses	0.5	9.4	0.7	11.5
Impairment charges	0.4	1.3	0.4	1.3
Loss on sale of assets	0.0	0.0	1.7	0.0
Operating income	33.6	13.9	91.2	65.0
Interest expense	(6.2)	(6.3)	(18.9)	(19.5)
Other expense - net	(0.5)	(0.3)	(2.1)	(2.3)
Earnings before income taxes	26.9	7.3	70.2	43.2
(Provision) benefit for income taxes	(8.6)	(35.2)	9.3	(37.4)
Net earnings (loss)	18.3	(27.9)	79.5	5.8
Net earnings attributable to noncontrolling interest	(0.3)	(0.4)	(1.0)	(1.2)
Net earnings (loss) attributable to Modine	$ 18.0	$ (28.3)	$ 78.5	$ 4.6
Net earnings (loss) per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 0.36	$ (0.57)	$ 1.55	$ 0.09
Diluted (in dollars per share)	$ 0.35	$ (0.57)	$ 1.53	$ 0.09
Weighted-average shares outstanding:
Basic (in shares)	50.5	50.0	50.4	49.8
Diluted (in shares)	51.2	50.0	51.2	50.6