Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net earnings attributable to Modine	$ 24.4	$ 0.4	$ 38.7	$ 2.7
Weighted-average shares outstanding - basic (in shares)	52.2	52.0	52.2	51.9
Effect of dilutive securities (in shares)	0.5	0.6	0.3	0.6
Weighted-average shares outstanding - diluted (in shares)	52.7	52.6	52.5	52.5
Earnings per Share [Abstract]
Net earnings per share - basic (in dollars per share)	$ 0.47	$ 0.01	$ 0.74	$ 0.05
Net earnings per share - diluted (in dollars per share)	$ 0.46	$ 0.01	$ 0.74	$ 0.05
Stock Options [Member]
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earning per share (in shares)	0.7	0.6	0.7	0.6
Restricted Stock [Member]
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earning per share (in shares)	0.1	0.2	0.1	0.2