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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, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Components of basic and diluted earnings per share [Abstract]
Net earnings (loss) attributable to Modine	$ 18.0	$ (28.3)	$ 78.5	$ 4.6
Less: Undistributed earnings attributable to unvested shares	(0.1)	0.0	(0.3)	0.0
Net earnings (loss) available to Modine shareholders	$ 17.9	$ (28.3)	$ 78.2	$ 4.6
Weighted-average shares outstanding - basic (in shares)	50.5	50.0	50.4	49.8
Effect of dilutive securities (in shares)	0.7	0.0	0.8	0.8
Weighted-average shares outstanding - diluted (in shares)	51.2	50.0	51.2	50.6
Earnings per share [Abstract]
Net earnings (loss) per share - basic (in dollars per share)	$ 0.36	$ (0.57)	$ 1.55	$ 0.09
Net earnings (loss) per share - diluted (in dollars per share)	$ 0.35	$ (0.57)	$ 1.53	$ 0.09
Potential dilutive securities (in shares)		1.1
Stock Options [Member]
Antidilutive securities excluded from computation of earning per share [Abstract]
Antidilutive securities excluded from computation of earning per share (in shares)	0.5	0.2	0.4	0.2

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