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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Components of basic and diluted earnings per share [Abstract]    
Net (loss) earnings attributable to Modine $ (8.6) $ 8.0
Weighted-average shares outstanding - basic (in shares) 50.9 50.7
Effect of dilutive securities (in shares) 0.0 0.4
Weighted-average shares outstanding - diluted (in shares) 50.9 51.1
(Loss) earnings per share [Abstract]    
Net (loss) earnings per share - basic (in dollars per share) $ (0.17) $ 0.16
Net (loss) earnings per share - diluted (in dollars per share) $ (0.17) $ 0.16
Stock Options [Member]    
Antidilutive securities excluded from computation of earning per share [Abstract]    
Antidilutive securities excluded from computation of earning per share (in shares) 1.4 0.8
Restricted Stock [Member]    
Antidilutive securities excluded from computation of earning per share [Abstract]    
Antidilutive securities excluded from computation of earning per share (in shares) 0.4 0.2