Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Components of basic and diluted earnings per share [Abstract]
(Loss) earnings from continuing operations	$ (1.6)	$ (8.4)	$ (11.8)	$ (1.0)	$ 15.7	$ 8.8	$ 0.9	$ 12.6	$ (22.8)	$ 38.0	$ 8.3
Less: Net earnings attributable to noncontrolling interest									(1.4)	(0.3)	0
(Loss) earnings from continuing operations attributable to Modine									(24.2)	37.7	8.3
Less: Undistributed earnings attributable to unvested shares									0	(0.2)	0
(Loss) earnings from continuing operations available to Modine shareholders									(24.2)	37.5	8.3
Earnings (loss) from discontinued operations									0	0.8	(3.1)
Net (loss) earnings available to Modine shareholders									$ (24.2)	$ 38.3	$ 5.2
Weighted average shares outstanding - basic (in shares)									46.6	46.5	46.2
Effect of dilutive securities (in shares)									0	0.4	0.5
Weighted average shares outstanding - diluted (in shares)									46.6	46.9	46.7
Basic Earnings Per Share [Abstract]
(Loss) earnings per share - continuing operations (in dollars per share)	$ (0.04)	$ (0.19)	$ (0.26)	$ (0.03)	$ 0.33	$ 0.18	$ 0.02	$ 0.27	$ (0.52)	$ 0.81	$ 0.18
Earnings (loss) per share - discontinued operations (in dollars per share)									$ 0	$ 0.02	$ (0.07)
Net (loss) earnings per share - basic (in dollars per share)									$ (0.52)	$ 0.83	$ 0.11
Diluted Earnings Per Share [Abstract]
(Loss) earnings per share - continuing operations (in dollars per share)	$ (0.04)	$ (0.19)	$ (0.26)	$ (0.03)	$ 0.33	$ 0.18	$ 0.02	$ 0.27	$ (0.52)	$ 0.80	$ 0.18
Earnings (loss) per share - discontinued operations (in dollars per share)									$ 0	$ 0.02	$ (0.07)
Net (loss) earnings per share - diluted (in dollars per share)	$ (0.04)	$ (0.19)	$ (0.26)	$ (0.03)	$ 0.33	$ 0.19	$ 0.03	$ 0.27	$ (0.52)	$ 0.82	$ 0.11
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)									1.1	1.1	1.5
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earning per share (in shares)									0.1	0.4	0.2