Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Components of basic and diluted earnings per share [Abstract]
Net earnings (loss) attributable to Modine	$ 1.7	$ 8.2	$ 6.2	$ (9.2)
Less: Undistributed earnings attributable to unvested shares	0.0	(0.2)	(0.1)	0.0
Net earnings (loss) available to Modine shareholders	$ 1.7	$ 8.0	$ 6.1	$ (9.2)
Weighted-average shares outstanding - basic (in shares)	47.9	47.4	47.3	47.4
Effect of dilutive securities (in shares)	0.6	0.4	0.4	0.0
Weighted-average shares outstanding - diluted (in shares)	48.5	47.8	47.7	47.4
Earnings per share [Abstract]
Net earnings (loss) per share - basic (in dollars per share)	$ 0.04	$ 0.17	$ 0.13	$ (0.19)
Net earnings (loss) per share - diluted (in dollars per share)	$ 0.04	$ 0.17	$ 0.13	$ (0.19)
Potential dilutive securities (in shares)				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	1.0	1.0	0.9