Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Basic Earnings Per Share [Abstract]
Net earnings (loss) attributable to Modine	$ 85.2	$ (210.7)	$ (2.2)
Weighted-average shares outstanding - basic (in shares)	52.0	51.3	50.8
Net earnings (loss) per share - basic (in dollars per share)	$ 1.64	$ (4.11)	$ (0.04)
Diluted Earnings Per Share [Abstract]
Net earnings (loss) attributable to Modine	$ 85.2	$ (210.7)	$ (2.2)
Weighted-average shares outstanding - basic (in shares)	52.0	51.3	50.8
Effect of dilutive securities (in shares)	0.5	0.0	0.0
Weighted-average shares outstanding - diluted (in shares)	52.5	51.3	50.8
Net earnings (loss) per share - diluted (in dollars per share)	$ 1.62	$ (4.11)	$ (0.04)
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	0.3
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earning per share (in shares)	0.5	1.0	1.1
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earning per share (in shares)	0.2	0.4	0.5