CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - 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, 2019	$ 33.0	$ 238.6	$ 472.1	$ (178.4)	$ (31.4)	$ 7.2	$ 541.1
Balance (in shares) at Mar. 31, 2019	52.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) 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
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings attributable to Modine							3.3
Other comprehensive income (loss)							(16.5)
Net earnings attributable to noncontrolling interest							0.1
Balance at Sep. 30, 2019	$ 33.2	242.9	475.4	(194.6)	(37.0)	5.7	525.6
Balance (in shares) at Sep. 30, 2019	53.3
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings attributable to Modine	$ 0.0	0.0	(4.7)	0.0	0.0	0.0	(4.7)
Other comprehensive income (loss)	0.0	0.0	0.0	(18.4)	0.0	(0.2)	(18.6)
Stock-based compensation expense	0.0	2.7	0.0	0.0	0.0	0.0	2.7
Net earnings attributable to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	(0.1)	(0.1)
Balance at Sep. 30, 2019	$ 33.2	242.9	475.4	(194.6)	(37.0)	5.7	525.6
Balance (in shares) at Sep. 30, 2019	53.3
Balance at Mar. 31, 2020	$ 33.3	245.1	469.9	(223.3)	(37.1)	5.7	$ 493.6
Balance (in shares) at Mar. 31, 2020	53.4						53.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings attributable to Modine	$ 0.0	0.0	(8.6)	0.0	0.0	0.0	$ (8.6)
Other comprehensive income (loss)	0.0	0.0	0.0	7.5	0.0	0.1	7.6
Stock options and awards	$ 0.2	(0.2)	0.0	0.0	0.0	0.0	0.0
Stock options and awards (in shares)	0.3
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(0.8)	0.0	(0.8)
Stock-based compensation expense	0.0	0.7	0.0	0.0	0.0	0.0	0.7
Net earnings attributable to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	0.2	0.2
Balance at Jun. 30, 2020	$ 33.5	245.6	461.3	(215.8)	(37.9)	6.0	492.7
Balance (in shares) at Jun. 30, 2020	53.7
Balance at Mar. 31, 2020	$ 33.3	245.1	469.9	(223.3)	(37.1)	5.7	$ 493.6
Balance (in shares) at Mar. 31, 2020	53.4						53.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings attributable to Modine							$ 0.0
Other comprehensive income (loss)							26.7
Net earnings attributable to noncontrolling interest							0.5
Balance at Sep. 30, 2020	$ 33.6	247.0	469.9	(196.8)	(37.9)	6.4	$ 522.2
Balance (in shares) at Sep. 30, 2020	53.8						53.8
Balance at Jun. 30, 2020	$ 33.5	245.6	461.3	(215.8)	(37.9)	6.0	$ 492.7
Balance (in shares) at Jun. 30, 2020	53.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings attributable to Modine	$ 0.0	0.0	8.6	0.0	0.0	0.0	8.6
Other comprehensive income (loss)	0.0	0.0	0.0	19.0	0.0	0.1	19.1
Stock options and awards	$ 0.1	0.0	0.0	0.0	0.0	0.0	0.1
Stock options and awards (in shares)	0.1
Stock-based compensation expense	$ 0.0	1.4	0.0	0.0	0.0	0.0	1.4
Net earnings attributable to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	0.3	0.3
Balance at Sep. 30, 2020	$ 33.6	$ 247.0	$ 469.9	$ (196.8)	$ (37.9)	$ 6.4	$ 522.2
Balance (in shares) at Sep. 30, 2020	53.8						53.8