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Contingencies and Litigation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Site
Dec. 31, 2013
Mar. 31, 2014
Mar. 31, 2012
Environmental Matters [Abstract]            
Reserves for these environmental matters $ 4.2us-gaap_LossContingencyEstimateOfPossibleLoss   $ 4.2us-gaap_LossContingencyEstimateOfPossibleLoss   $ 5.1us-gaap_LossContingencyEstimateOfPossibleLoss  
Number of sites remediation considered for potentially responsible party     3mod_NumberOfSitesRemediationConsideredForPotentiallyResponsibleParty      
Value added tax payable           10.7us-gaap_SalesAndExciseTaxPayableCurrentAndNoncurrent
Reduction to selling general and administrative expense $ 1.0mod_ReductionToSellingGeneralAndAdministrativeExpense $ 1.1mod_ReductionToSellingGeneralAndAdministrativeExpense $ 1.2mod_ReductionToSellingGeneralAndAdministrativeExpense $ 1.6mod_ReductionToSellingGeneralAndAdministrativeExpense