Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net earnings (loss) attributable to Modine	$ 74.1	$ (195.7)	$ 76.8	$ (195.7)
Weighted-average shares outstanding - basic (in shares)	52.0	51.3	51.9	51.2
Effect of dilutive securities (in shares)	0.4	0.0	0.6	0.0
Weighted-average shares outstanding - diluted (in shares)	52.4	51.3	52.5	51.2
Earnings (loss) per share [Abstract]
Net earnings (loss) per share - basic (in dollars per share)	$ 1.42	$ (3.81)	$ 1.48	$ (3.82)
Net earnings (loss) per share - diluted (in dollars per share)	$ 1.41	$ (3.81)	$ 1.46	$ (3.82)
Earnings Per Share [Abstract]
Potentially dilutive securities not included in computation of diluted net loss per share (in shares)		0.2		0.1
Stock Options [Member]
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earning per share (in shares)	0.6	1.4	0.6	1.5
Restricted Stock [Member]
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earning per share (in shares)	0.2	0.5	0.2	0.6