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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations | $ (3.0)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | $ 9.1 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | $ 2.0 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | $ 14.1 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | $ 119.7 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1],[2] | $ (3.4)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1],[2] | $ 5.0 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1],[2] | $ 10.6 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1],[2] | $ 22.2 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 131.9 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ (22.8)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Less: Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.0)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (1.5)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (1.4)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
Less: Undistributed earnings attributable to unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.2)us-gaap_UndistributedEarnings | (1.7)us-gaap_UndistributedEarnings | 0 us-gaap_UndistributedEarnings
Earnings (loss) from continuing operations available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.0 us-gaap_IncomeLossFromContinuingOperations | 128.7 us-gaap_IncomeLossFromContinuingOperations | (24.2)us-gaap_IncomeLossFromContinuingOperations
Earnings from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net earnings (loss) available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 128.7 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (24.2)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.2 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 46.9 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 46.6 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share - continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.45 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 2.75 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Earnings per share - discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net earnings (loss) per share - basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.46 us-gaap_IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciplePerBasicShare | $ 2.75 us-gaap_IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciplePerBasicShare | $ (0.52)us-gaap_IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciplePerBasicShare
Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations | (3.0)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | 9.1 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | 2.0 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | 14.1 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | 119.7 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1],[2] | (3.4)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1],[2] | 5.0 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1],[2] | 10.6 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1],[2] | 22.2 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 131.9 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (22.8)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Less: Net earnings attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.0)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (1.5)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | (1.4)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
Less: Undistributed earnings attributable to unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.2)us-gaap_UndistributedEarningsDiluted | (0.9)us-gaap_UndistributedEarningsDiluted | 0 us-gaap_UndistributedEarningsDiluted
Earnings (loss) from continuing operations available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.0 mod_NetEarningsLossFromContinuingOperationsAvailableToCommonShareholdersDiluted | 129.5 mod_NetEarningsLossFromContinuingOperationsAvailableToCommonShareholdersDiluted | (24.2)mod_NetEarningsLossFromContinuingOperationsAvailableToCommonShareholdersDiluted
Earnings from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net earnings (loss) available to Modine shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.6 us-gaap_NetIncomeLossAttributableToParentDiluted | $ 129.5 us-gaap_NetIncomeLossAttributableToParentDiluted | $ (24.2)us-gaap_NetIncomeLossAttributableToParentDiluted
Weighted average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.2 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 46.9 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 46.6 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 0.7 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.8 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 47.6 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 46.6 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share - continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.44 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.72 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Earnings per share - discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net earnings (loss) per share - diluted (in dollars per share) | $ (0.07)us-gaap_EarningsPerShareDiluted |  | $ 0.20 us-gaap_EarningsPerShareDiluted |  | $ 0.04 us-gaap_EarningsPerShareDiluted |  | $ 0.28 us-gaap_EarningsPerShareDiluted |  | $ 2.49 us-gaap_EarningsPerShareDiluted |  | $ (0.08)us-gaap_EarningsPerShareDiluted |  | $ 0.10 us-gaap_EarningsPerShareDiluted |  | $ 0.21 us-gaap_EarningsPerShareDiluted |  | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 2.72 us-gaap_EarningsPerShareDiluted | $ (0.52)us-gaap_EarningsPerShareDiluted
Potential dilutive securities (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3 mod_PotentialDilutiveSecurities
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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 0.8 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 1.1 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember
[1] | The quarterly financial data presented above includes restructuring expenses and impairment charges related to restructuring actions in Europe, North America, and South America segments. 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. During the third quarter of fiscal 2015, the Company sold a wind tunnel within the Europe segment and recognized a gain of $3.2 million. During the fourth quarter of fiscal 2015, the Company recorded a $7.8 million goodwill impairment charge related to its South America segment. Also during the fourth quarter of fiscal 2015, the Company recorded a $3.2 million charge in its South America segment associated with a legal matter in Brazil. During fiscal 2014, restructuring expenses totaled $0.5 million, $0.6 million, $9.4 million, and $5.6 million for the quarters ended June 30, 2013, September 30, 2013, December 31, 2013, and March 31, 2014, respectively. The Company recorded impairment charges of $2.0 million and $1.2 million during the quarters ended December 31, 2013 and March 31, 2014, respectively. See Notes 6, 14, and 19 for additional information.
[2] | The quarter ended March 31, 2014 was benefited by the reversal of U.S. income tax valuation allowances totaling $119.2 million. See Note 8 for additional information.

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