CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock, at Cost [Member]	Non-controlling Interest [Member]	Total
Balance at Mar. 31, 2018	$ 32.7	$ 229.9	$ 394.9	$ (140.3)	$ (27.1)	$ 8.4	$ 498.5
Balance (in shares) at Mar. 31, 2018	52.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Modine	$ 0.0	0.0	22.0	0.0	0.0	0.0	22.0
Other comprehensive income (loss)	0.0	0.0	0.0	(23.3)	0.0	(0.4)	(23.7)
Stock options and awards	$ 0.2	(0.2)	0.0	0.0	0.0	0.0	0.0
Stock options and awards (in shares)	0.4
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(3.7)	0.0	(3.7)
Stock-based compensation expense	0.0	2.0	0.0	0.0	0.0	0.0	2.0
Dividend paid to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	(1.8)	(1.8)
Net earnings attributable to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	0.5	0.5
Balance at Jun. 30, 2018	$ 32.9	231.7	409.3	(163.6)	(30.8)	6.7	486.2
Balance (in shares) at Jun. 30, 2018	52.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting guidance (Note 1)	$ 0.0	0.0	(7.6)	0.0	0.0	0.0	(7.6)
Balance at Mar. 31, 2019	$ 33.0	238.6	472.1	(178.4)	(31.4)	7.2	$ 541.1
Balance (in shares) at Mar. 31, 2019	52.8						52.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Modine	$ 0.0	0.0	8.0	0.0	0.0	0.0	$ 8.0
Other comprehensive income (loss)	0.0	0.0	0.0	2.2	0.0	(0.1)	2.1
Stock options and awards	$ 0.2	(0.1)	0.0	0.0	0.0	0.0	0.1
Stock options and awards (in shares)	0.5
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(5.6)	0.0	(5.6)
Stock-based compensation expense	0.0	1.7	0.0	0.0	0.0	0.0	1.7
Dividend paid to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	(1.3)	(1.3)
Net earnings attributable to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	0.2	0.2
Balance at Jun. 30, 2019	$ 33.2	$ 240.2	$ 480.1	$ (176.2)	$ (37.0)	$ 6.0	$ 546.3
Balance (in shares) at Jun. 30, 2019	53.3						53.3