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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Basic Earnings Per Share [Abstract] |  |  |  |
(Loss) earnings from continuing operations | $ (8.4) | $ 8.8 | $ (21.2) | $ 22.3
Less: Net earnings attributable to noncontrolling interest | (0.3) | (0.1) | (0.9) | (0.1)
(Loss) earnings from continuing operations attributable to Modine | (8.7) | 8.7 | (22.1) | 22.2
Less: Undistributed earnings attributable to unvested shares | 0 | 0 | 0 | (0.1)
(Loss) earnings from continuing operations available to Modine shareholders | (8.7) | 8.7 | (22.1) | 22.1
Earnings from discontinued operations | 0 | 0.3 | 0 | 0.7
Less: Undistributed earnings attributable to unvested shares | 0 | 0 | 0 | 0
Earnings from discontinued operations available to Modine shareholders | 0 | 0.3 | 0 | 0.7
Net (loss) earnings available to Modine shareholders | (8.7) | 9.0 | (22.1) | 22.8
Weighted average shares outstanding - basic (in shares) | 46.7 | 46.5 | 46.6 | 46.5
(Loss) earnings per share - continuing operations (in dollars per share) | $ (0.19) | $ 0.18 | $ (0.47) | $ 0.47
Earnings per share - discontinued operations (in dollars per share) | $ 0 | $ 0.01 | $ 0 | $ 0.02
Net (loss) earnings per share - basic (in dollars per share) | $ (0.19) | $ 0.19 | $ (0.47) | $ 0.49
Diluted Earnings Per Share [Abstract] |  |  |  |
(Loss) earnings from continuing operations | (8.4) | 8.8 | (21.2) | 22.3
Less: Net earnings attributable to noncontrolling interest | (0.3) | (0.1) | (0.9) | (0.1)
(Loss) earnings from continuing operations attributable to Modine | (8.7) | 8.7 | (22.1) | 22.2
Less: Undistributed earnings attributable to unvested shares | 0 | 0 | 0 | (0.1)
(Loss) earnings from continuing operations available to Modine shareholders | (8.7) | 8.7 | (22.1) | 22.1
Earnings from discontinued operations | 0 | 0.3 | 0 | 0.7
Less: Undistributed earnings attributable to unvested shares | 0 | 0 | 0 | 0
Earnings from discontinued operations available to Modine shareholders | 0 | 0.3 | 0 | 0.7
Net (loss) earnings available to Modine shareholders | $ (8.7) | $ 9.0 | $ (22.1) | $ 22.8
Weighted average shares outstanding - basic (in shares) | 46.7 | 46.5 | 46.6 | 46.5
Effect of dilutive securities (in shares) | 0 | 0.3 | 0 | 0.4
Weighted average shares outstanding - diluted (in shares) | 46.7 | 46.8 | 46.6 | 46.9
(Loss) earnings per share - continuing operations (in dollars per share) | $ (0.19) | $ 0.18 | $ (0.47) | $ 0.47
Earnings per share - discontinued operations (in dollars per share) | $ 0 | $ 0.01 | $ 0 | $ 0.02
Net (loss) earnings per share - diluted (in dollars per share) | $ (0.19) | $ 0.19 | $ (0.47) | $ 0.49
Potential dilutive securities (in shares) | 0.3 |  | 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) | 1.2 | 1.4 | 1.2 | 1.4
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) | 0.2 | 0.2 | 0.2 | 0.2

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