Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components of basic and diluted earnings per share [Abstract]
Net (loss) earnings attributable to Modine	$ (22.5)	$ 1.7	$ (17.4)	$ 15.4
Less: Undistributed earnings attributable to unvested shares	0.0	0.0	0.0	(0.2)
Net (loss) earnings available to Modine shareholders	$ (22.5)	$ 1.7	$ (17.4)	$ 15.2
Weighted-average shares outstanding - basic (in shares)	47.4	47.2	47.4	47.1
Effect of dilutive securities (in shares)	0.0	0.5	0.0	0.6
Weighted-average shares outstanding - diluted (in shares)	47.4	47.7	47.4	47.7
Earnings per share [Abstract]
Net (loss) earnings per share - basic (in dollars per share)	$ (0.47)	$ 0.04	$ (0.37)	$ 0.32
Net (loss) earnings per share - diluted (in dollars per share)	$ (0.47)	$ 0.04	$ (0.37)	$ 0.32
Potential dilutive securities (in shares)	0.4		0.4
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earning per share (in shares)	0.9	0.7	0.9	0.7