Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Basic Earnings Per Share [Abstract]
Net earnings (loss) attributable to Modine	$ 153.1	$ 85.2	$ (210.7)
Weighted-average shares outstanding - basic (in shares)	52.3	52.0	51.3
Net earnings (loss) per share - basic (in dollars per share)	$ 2.93	$ 1.64	$ (4.11)
Diluted Earnings Per Share [Abstract]
Net earnings (loss) attributable to Modine	$ 153.1	$ 85.2	$ (210.7)
Weighted-average shares outstanding - basic (in shares)	52.3	52.0	51.3
Effect of dilutive securities (in shares)	0.5	0.5	0.0
Weighted-average shares outstanding - diluted (in shares)	52.8	52.5	51.3
Net earnings (loss) per share - diluted (in dollars per share)	$ 2.9	$ 1.62	$ (4.11)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]
Potentially dilutive securities not included in computation of diluted net loss per share (in shares)			0.2
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	0.5	0.5	1.0
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	0.2	0.2	0.4