Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Components of basic and diluted earnings per share [Abstract]
Earnings (loss) from continuing operations	$ 5.0	$ (11.9)	$ 15.6	$ (12.9)
Less: Net earnings attributable to noncontrolling interest	(0.4)	(0.3)	(1.0)	(0.6)
Earnings (loss) from continuing operations attributable to Modine	4.6	(12.2)	14.6	(13.5)
Less: Undistributed earnings attributable to unvested shares	0	0	(0.1)	0
Earnings (loss) from continuing operations available to Modine shareholders	4.6	(12.2)	14.5	(13.5)
Earnings from discontinued operations	0	0	0	0.1
Net earnings (loss) available to Modine shareholders	$ 4.6	$ (12.2)	$ 14.5	$ (13.4)
Weighted average shares outstanding - basic (in shares)	46.8	46.6	46.8	46.6
Effect of dilutive securities (in shares)	0.8	0	0.6	0
Weighted average shares outstanding - diluted (in shares)	47.6	46.6	47.4	46.6
Basic Earnings Per Share [Abstract]
Earnings (loss) per share - continuing operations (in dollars per share)	$ 0.10	$ (0.26)	$ 0.31	$ (0.29)
Earnings per share - discontinued operations (in dollars per share)	$ 0	$ 0	$ 0	$ 0
Net earnings (loss) per share - basic (in dollars per share)	$ 0.10	$ (0.26)	$ 0.31	$ (0.29)
Diluted Earnings Per Share [Abstract]
Earnings (loss) per share - continuing operations (in dollars per share)	$ 0.10	$ (0.26)	$ 0.31	$ (0.29)
Earnings per share - discontinued operations (in dollars per share)	$ 0	$ 0	$ 0	$ 0
Net earnings (loss) per share - diluted (in dollars per share)	$ 0.10	$ (0.26)	$ 0.31	$ (0.29)
Potential dilutive securities (in shares)		0.2		0.3
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	1.3	0.7	1.3