Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Components of basic and diluted earnings per share [Abstract]
Net earnings attributable to Modine	$ 1.7	$ 4.6	$ 15.4	$ 14.6
Less: Undistributed earnings attributable to unvested shares	0	0	(0.2)	(0.1)
Net earnings available to Modine shareholders	$ 1.7	$ 4.6	$ 15.2	$ 14.5
Weighted average shares outstanding - basic (in shares)	47.2	46.8	47.1	46.8
Effect of dilutive securities (in shares)	0.5	0.8	0.6	0.6
Weighted average shares outstanding - diluted (in shares)	47.7	47.6	47.7	47.4
Earnings per share: [Abstract]
Net earnings per share - basic (in dollars per share)	$ 0.04	$ 0.10	$ 0.32	$ 0.31
Net earnings per share - diluted (in dollars per share)	$ 0.04	$ 0.10	$ 0.32	$ 0.31
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)	0.7	0.7	0.7	0.7