Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Components of basic and diluted earnings per share [Abstract]
Earnings (loss) from continuing operations	$ 10.6	$ (1.0)
Less: Net earnings attributable to noncontrolling interest	(0.6)	(0.3)
Earnings (loss) from continuing operations attributable to Modine	10.0	(1.3)
Less: Undistributed earnings attributable to unvested shares	(0.1)	0
Earnings (loss) from continuing operations available to Modine shareholders	9.9	(1.3)
Earnings from discontinued operations	0	0.1
Net earnings (loss) available to Modine shareholders	$ 9.9	$ (1.2)
Weighted average shares outstanding - basic (in shares)	46.7	46.5
Effect of dilutive securities (in shares)	0.6	0
Weighted average shares outstanding - diluted (in shares)	47.3	46.5
Earnings Per Share, Basic [Abstract]
Earnings (loss) per share - continuing operations (in dollars per share)	$ 0.21	$ (0.03)
Earnings per share - discontinued operations (in dollars per share)	$ 0	$ 0
Net earnings (loss) per share - basic (in dollars per share)	$ 0.21	$ (0.03)
Diluted Earnings Per Share [Abstract]
Earnings (loss) per share - continuing operations	$ 0.21	$ (0.03)
Earnings per share - discontinued operations	$ 0	$ 0
Net earnings (loss) per share - diluted	$ 0.21	$ (0.03)
Potential dilutive securities (in shares)		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)	1.0	1.3