Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to Modine	$ 46.1	$ 46.5	$ 93.4	$ 91.3
Weighted-average shares outstanding - basic (in shares)	52,600,000	52,400,000	52,500,000	52,400,000
Effect of dilutive securities (in shares)	1,300,000	1,000,000.0	1,400,000	800,000
Weighted-average shares outstanding - diluted (in shares)	53,900,000	53,400,000	53,900,000	53,200,000
Earnings per Share [Abstract]
Net earnings per share - basic (in dollars per share)	$ 0.88	$ 0.89	$ 1.78	$ 1.74
Net earnings per share - diluted (in dollars per share)	$ 0.86	$ 0.87	$ 1.73	$ 1.72
Antidilutive securities excluded from computation of earnings per share (in shares)	0		0
Restricted Stock [Member]
Earnings per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)				100,000