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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) earnings from continuing operations | $ 7.8 | [1] | $ 8.2 | [1] | $ (22.5) | [1] | $ 5.5 | [1] | $ (3.0) | [2] | $ 9.1 | [2] | $ 2.0 | [2] | $ 14.1 | [2] | $ (1.0) | $ 22.2 | $ 131.9
Less: Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.6) | (1.0) | (1.5)
Less: Undistributed earnings attributable to unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (0.2) | (1.7)
(Loss) earnings from continuing operations available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.6) | 21.0 | 128.7
Earnings from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.6 | 0.0
Net (loss) earnings available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.6) | $ 21.6 | $ 128.7
Weighted-average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.3 | 47.2 | 46.9
Basic Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) earnings per share - continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.03) | $ 0.45 | $ 2.75
Earnings per share - discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0.01 | 0
Net (loss) earnings per share - basic (in dollars per share) | $ 0.16 |  | $ 0.17 |  | $ (0.47) |  | $ 0.11 |  | $ (0.07) |  | $ 0.20 |  | $ 0.04 |  | $ 0.29 |  | $ (0.03) | $ 0.46 | $ 2.75
Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) earnings from continuing operations | $ 7.8 | [1] | $ 8.2 | [1] | $ (22.5) | [1] | $ 5.5 | [1] | $ (3.0) | [2] | $ 9.1 | [2] | $ 2.0 | [2] | $ 14.1 | [2] | $ (1.0) | $ 22.2 | $ 131.9
Less: Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.6) | (1.0) | (1.5)
Less: Undistributed earnings attributable to unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | (0.2) | (0.9)
(Loss) earnings from continuing operations available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.6) | 21.0 | 129.5
Earnings from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.6 | 0.0
Net (loss) earnings available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.6) | $ 21.6 | $ 129.5
Weighted-average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.3 | 47.2 | 46.9
Effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.6 | 0.7
Weighted-average shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.3 | 47.8 | 47.6
Diluted Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) earnings per share - continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.03) | $ 0.44 | $ 2.72
Earnings per share - discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0.01 | 0
Net (loss) earnings per share - diluted (in dollars per share) | $ 0.16 |  | $ 0.17 |  | $ (0.47) |  | $ 0.11 |  | $ (0.07) |  | $ 0.20 |  | $ 0.04 |  | $ 0.28 |  | $ (0.03) | $ 0.45 | $ 2.72
Potential dilutive securities (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.8 | 0.6 | 0.8
[1] | During fiscal 2016, restructuring expenses totaled $2.6 million, $1.0 million, $1.6 million, and $11.4 million for the quarters ended June 30, 2015, September 30, 2015, December 31, 2015, and March 31, 2016, respectively (see Note 6). During the fourth quarter of fiscal 2016, the Company recorded a $9.9 million asset impairment charge related to a manufacturing facility in Germany (see Note 6). During fiscal 2016, non-cash pension settlement losses totaled $39.2 million, $1.1 million, and $1.8 million for the quarters ended September 30, 2015, December 31, 2015, and March 31, 2016, respectively (see Note 17). During the fourth quarter of fiscal 2016, the Company recorded a $9.5 million gain related to an insurance settlement for equipment losses resulting from the Airedale fire (see Note 2). Also during the fourth quarter of fiscal 2016, the Company reversed a deferred tax asset valuation allowance, and, as a result, recorded an income tax benefit of $3.0 million (see Note 8).
[2] | During fiscal 2015, restructuring expenses totaled $0.8 million, $1.0 million, $1.9 million, and $1.0 million for the quarters ended June 30, 2014, September 30, 2014, December 31, 2014, and March 31, 2015, respectively (see Note 6). During the third quarter of fiscal 2015, the Company sold a wind tunnel and recognized a gain of $3.2 million (see Note 6). During the fourth quarter of fiscal 2015, the Company recorded a $7.8 million goodwill impairment charge (see Note 14) and a $3.2 million charge associated with a legal matter in Brazil (see Note 19).

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