Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net earnings attributable to Modine	$ 46.5	$ 24.4	$ 91.3	$ 38.7
Weighted-average shares outstanding - basic (in shares)	52.4	52.2	52.4	52.2
Effect of dilutive securities (in shares)	1.0	0.5	0.8	0.3
Weighted-average shares outstanding - diluted (in shares)	53.4	52.7	53.2	52.5
Earnings per Share [Abstract]
Net earnings per share - basic (in dollars per share)	$ 0.89	$ 0.47	$ 1.74	$ 0.74
Net earnings per share - diluted (in dollars per share)	$ 0.87	$ 0.46	$ 1.72	$ 0.74
Stock Options [Member]
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)		0.7		0.7
Restricted Stock [Member]
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)		0.1	0.1	0.1