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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, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations | $ 8.1 | [1] | $ 1.9 | [1] | $ (4.0) | [1] | $ 8.9 | [1] | $ 7.8 | [2] | $ 8.2 | [2] | $ (22.5) | [2] | $ 5.5 | [2] | $ 14.9 | [1] | $ (1.0) | [2] | $ 22.2
Less: Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.7) |  | (0.6) |  | (1.0)
Less: Undistributed earnings attributable to unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.2) |  | 0.0 |  | (0.2)
Earnings (loss) from continuing operations available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.0 |  | (1.6) |  | 21.0
Earnings from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.6
Net earnings (loss) available to Modine |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.0 |  | $ (1.6) |  | $ 21.6
Weighted-average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.8 |  | 47.3 |  | 47.2
Basic Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share - continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.29 |  | $ (0.03) |  | $ 0.45
Earnings per share - discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0.01
Net earnings (loss) per share - basic (in dollars per share) | $ 0.16 |  | $ 0.04 |  | $ (0.09) |  | $ 0.18 |  | $ 0.16 |  | $ 0.17 |  | $ (0.47) |  | $ 0.11 |  | $ 0.29 |  | $ (0.03) |  | $ 0.46
Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations | $ 8.1 | [1] | $ 1.9 | [1] | $ (4.0) | [1] | $ 8.9 | [1] | $ 7.8 | [2] | $ 8.2 | [2] | $ (22.5) | [2] | $ 5.5 | [2] | $ 14.9 | [1] | $ (1.0) | [2] | $ 22.2
Less: Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.7) |  | (0.6) |  | (1.0)
Less: Undistributed earnings attributable to unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.1) |  | 0.0 |  | (0.2)
Earnings (loss) from continuing operations available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.1 |  | (1.6) |  | 21.0
Earnings from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.6
Net earnings (loss) available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.1 |  | $ (1.6) |  | $ 21.6
Weighted-average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.8 |  | 47.3 |  | 47.2
Effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5 |  | 0.0 |  | 0.6
Weighted-average shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.3 |  | 47.3 |  | 47.8
Diluted Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share - continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.29 |  | $ (0.03) |  | $ 0.44
Earnings per share - discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0.01
Net earnings (loss) per share - diluted (in dollars per share) | $ 0.16 |  | $ 0.04 |  | $ (0.09) |  | $ 0.18 |  | $ 0.16 |  | $ 0.17 |  | $ (0.47) |  | $ 0.11 |  | $ 0.29 |  | $ (0.03) |  | $ 0.45
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 |  | 0.8 |  | 0.6
[1] | During fiscal 2017, restructuring expenses totaled $2.3 million, $2.1 million, $1.6 million, and $4.9 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 5). During fiscal 2017, the Company sold two previously-closed manufacturing facilities in its Americas segment and a facility in its Europe segment and recognized net gains totaling $1.2 million and $0.8 million in the quarters ended September 30, 2016 and March 31, 2017, respectively. During fiscal 2017, acquisition- and integration-related costs totaled $1.4 million, $3.0 million, $7.2 million, and $3.2 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 2). During the fourth quarter of fiscal 2017, the Company recorded a deferred tax valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded income tax expense of $2.0 million (see Note 7).
[2] | 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 5). 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 5). 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 16). 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. 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 related to a foreign tax jurisdiction of $3.0 million (see Note 7).

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