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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Components of basic and diluted earnings per share [Abstract]
Net (loss) earnings attributable to Modine	$ (4.1)	$ (22.5)	$ 4.5	$ (17.4)
Less: Undistributed earnings attributable to unvested shares	0.0	0.0	(0.1)	0.0
Net (loss) earnings available to Modine shareholders	$ (4.1)	$ (22.5)	$ 4.4	$ (17.4)
Weighted-average shares outstanding - basic (in shares)	47.1	47.4	47.0	47.4
Effect of dilutive securities (in shares)	0.0	0.0	0.3	0.0
Weighted-average shares outstanding - diluted (in shares)	47.1	47.4	47.3	47.4
Earnings per share [Abstract]
Net (loss) earnings per share - basic (in dollars per share)	$ (0.09)	$ (0.47)	$ 0.09	$ (0.37)
Net (loss) earnings per share - diluted (in dollars per share)	$ (0.09)	$ (0.47)	$ 0.09	$ (0.37)
Potential dilutive securities (in shares)	0.4	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)	1.1	0.9	1.1	0.9

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