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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Components of basic and diluted earnings per share [Abstract]
Net (loss) earnings attributable to Modine	$ (28.3)	$ 1.7	$ 4.6	$ 6.2
Less: Undistributed earnings attributable to unvested shares	0.0	0.0	0.0	(0.1)
Net (loss) earnings available to Modine shareholders	$ (28.3)	$ 1.7	$ 4.6	$ 6.1
Weighted-average shares outstanding - basic (in shares)	50.0	47.9	49.8	47.3
Effect of dilutive securities (in shares)	0.0	0.6	0.8	0.4
Weighted-average shares outstanding - diluted (in shares)	50.0	48.5	50.6	47.7
Earnings per share [Abstract]
Net (loss) earnings per share - basic (in dollars per share)	$ (0.57)	$ 0.04	$ 0.09	$ 0.13
Net (loss) earnings per share - diluted (in dollars per share)	$ (0.57)	$ 0.04	$ 0.09	$ 0.13
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	1.1
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)	0.2	0.9	0.2	1.0

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