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Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Sep. 30, 2013
Jun. 30, 2012
Consolidation principles [Abstract]          
Investments in non-consolidated affiliated companies (in hundredths) 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage        
Shipping and handling costs [Abstract]          
Shipping and handling costs $ 4.9us-gaap_ShippingHandlingAndTransportationCosts $ 4.0us-gaap_ShippingHandlingAndTransportationCosts $ 4.3us-gaap_ShippingHandlingAndTransportationCosts    
Research and development [Abstract]          
Research and development cost 62.0us-gaap_ResearchAndDevelopmentExpense 61.7us-gaap_ResearchAndDevelopmentExpense 68.4us-gaap_ResearchAndDevelopmentExpense    
Trade accounts receivable [Abstract]          
Trade receivables, allowance for doubtful accounts 1.0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 1.1us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent      
Trade receivables sold without recourse 87.0mod_TradeReceivablesSoldWithoutRecourse 82.4mod_TradeReceivablesSoldWithoutRecourse 99.1mod_TradeReceivablesSoldWithoutRecourse    
Loss on the sale of accounts receivables (0.3)us-gaap_GainLossOnSaleOfAccountsReceivable (0.3)us-gaap_GainLossOnSaleOfAccountsReceivable (0.3)us-gaap_GainLossOnSaleOfAccountsReceivable    
Goodwill impaired [Abstract]          
Goodwill impairment charges 7.8us-gaap_GoodwillImpairmentLoss        
Supplemental cash flow information [Abstract]          
Interest paid 10.3us-gaap_InterestPaidNet 12.6us-gaap_InterestPaidNet 11.6us-gaap_InterestPaidNet    
Income taxes paid 15.9us-gaap_IncomeTaxesPaidNet 11.4us-gaap_IncomeTaxesPaidNet 12.4us-gaap_IncomeTaxesPaidNet    
Error Correction [Member]          
Out of period adjustment [Abstract]          
Pre-tax earnings       (0.6)us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= us-gaap_RestatementAdjustmentMember
0.5us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= us-gaap_RestatementAdjustmentMember
After-tax earnings       (0.5)mod_QuantifyingMisstatementInCurrentYearFinancialStatementsAmountAfterTax
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= us-gaap_RestatementAdjustmentMember
 
Tools [Member]          
Tooling [Abstract]          
Property, plant and equipment, depreciable lives 3 years        
Company-owned tooling, net 18.7mod_CompanyOwnedToolingNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
28.6mod_CompanyOwnedToolingNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
     
Customer owned tooling receivable 11.6mod_CustomerOwnedToolingReceivable
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
10.3mod_CustomerOwnedToolingReceivable
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
     
Electronics Cooling Business [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Final payment on promissory note 1.5us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mod_ElectronicsCoolingBusinessMember
       
Gain on sale (Pre-tax) 0.9us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mod_ElectronicsCoolingBusinessMember
       
Gain on sale (After-tax) $ 0.6us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mod_ElectronicsCoolingBusinessMember