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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Activities:      
Consolidated net income $ 95.5us-gaap_ProfitLoss $ 83.4us-gaap_ProfitLoss $ 76.2us-gaap_ProfitLoss
Gain (loss) from discontinued operations 2.1us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (5.8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (2.5)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Income from continuing operations 93.4us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 89.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 78.7us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 84.4us-gaap_DepreciationDepletionAndAmortization 47.3us-gaap_DepreciationDepletionAndAmortization 51.1us-gaap_DepreciationDepletionAndAmortization
Loss on disposal of property, plant and equipment 0.5us-gaap_GainLossOnSaleOfPropertyPlantEquipment 1.2us-gaap_GainLossOnSaleOfPropertyPlantEquipment 1.1us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Pension amortization and settlement loss 5.1mtx_PensionSettlementGainOrLossAndAmortization 11.8mtx_PensionSettlementGainOrLossAndAmortization 11.5mtx_PensionSettlementGainOrLossAndAmortization
Deferred income taxes (21.1)us-gaap_DeferredIncomeTaxExpenseBenefit 4.4us-gaap_DeferredIncomeTaxExpenseBenefit 1.3us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for bad debts 2.4us-gaap_ProvisionForDoubtfulAccounts 0.6us-gaap_ProvisionForDoubtfulAccounts 1.0us-gaap_ProvisionForDoubtfulAccounts
Stock-based compensation 5.9us-gaap_ShareBasedCompensation 5.2us-gaap_ShareBasedCompensation 5.5us-gaap_ShareBasedCompensation
Asset impairment charge 23.7us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges
Other non-cash items 7.5us-gaap_OtherNoncashExpense 0.5us-gaap_OtherNoncashExpense 0.6us-gaap_OtherNoncashExpense
Changes in operating assets and liabilities      
Accounts receivable 5.2us-gaap_IncreaseDecreaseInAccountsReceivable (10.5)us-gaap_IncreaseDecreaseInAccountsReceivable (0.2)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories 19.5us-gaap_IncreaseDecreaseInInventories (6.5)us-gaap_IncreaseDecreaseInInventories 6.4us-gaap_IncreaseDecreaseInInventories
Pension plan funding (7.6)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations (11.4)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations (17.0)us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Accounts payable 16.0us-gaap_IncreaseDecreaseInAccountsPayable (0.8)us-gaap_IncreaseDecreaseInAccountsPayable (4.4)us-gaap_IncreaseDecreaseInAccountsPayable
Restructuring liabilities 14.6mtx_IncreaseDecreaseInRestructuringLiabilities (0.3)mtx_IncreaseDecreaseInRestructuringLiabilities (1.1)mtx_IncreaseDecreaseInRestructuringLiabilities
Income taxes payable 51.0us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (1.5)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 3.7us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Tax benefits related to stock incentive programs 3.7us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities 0.5us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities 0.5us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Prepaid expenses and other 9.9us-gaap_IncreaseDecreaseInPrepaidExpensesOther 7.8us-gaap_IncreaseDecreaseInPrepaidExpensesOther 3.4us-gaap_IncreaseDecreaseInPrepaidExpensesOther
Net cash provided by continuing operations 314.1us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 137.5us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 142.1us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash used in discontinued operations (3.3)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations (2.7)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations (2.2)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by operating activities 310.8us-gaap_NetCashProvidedByUsedInOperatingActivities 134.8us-gaap_NetCashProvidedByUsedInOperatingActivities 139.9us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities:      
Acquisition of business, net of cash acquired (1,802.3)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Purchases of property, plant and equipment (81.8)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (43.8)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (52.1)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from disposal of property, plant and equipment 9.4us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0.2us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Purchases of short-term investments (6.3)us-gaap_PaymentsToAcquireShortTermInvestments (5.4)us-gaap_PaymentsToAcquireShortTermInvestments (5.4)us-gaap_PaymentsToAcquireShortTermInvestments
Proceeds from sales of short-term investments 18.7us-gaap_ProceedsFromSaleOfShortTermInvestments 3.0us-gaap_ProceedsFromSaleOfShortTermInvestments 9.3us-gaap_ProceedsFromSaleOfShortTermInvestments
Other (0.7)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (1,863.0)us-gaap_NetCashProvidedByUsedInInvestingActivities (46.2)us-gaap_NetCashProvidedByUsedInInvestingActivities (48.0)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities:      
Proceeds from issuance of long-term debt 1,546.1us-gaap_ProceedsFromIssuanceOfLongTermDebt 75.0us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt
Debt issuance and settlement costs (38.2)us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts
Repayment of long-term debt (175.0)us-gaap_RepaymentsOfLongTermDebt (77.3)us-gaap_RepaymentsOfLongTermDebt (8.6)us-gaap_RepaymentsOfLongTermDebt
Net issuance (repayment) of short-term debt 0.1us-gaap_ProceedsFromRepaymentsOfShortTermDebt (1.2)us-gaap_ProceedsFromRepaymentsOfShortTermDebt 1.0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Purchase of common shares for treasury 0us-gaap_PaymentsForRepurchaseOfCommonStock (51.8)us-gaap_PaymentsForRepurchaseOfCommonStock (25.9)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from issuance of stock under option plan 3.4us-gaap_ProceedsFromStockOptionsExercised 12.1us-gaap_ProceedsFromStockOptionsExercised 8.2us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefits related to stock incentive programs 0.7us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 2.3us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 0.3us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Purchase of non-controlling interest share (2.1)us-gaap_PaymentsToMinorityShareholders 0us-gaap_PaymentsToMinorityShareholders 0us-gaap_PaymentsToMinorityShareholders
Dividends paid to non-controlling interest (3.3)us-gaap_PaymentsOfDividendsMinorityInterest (2.4)us-gaap_PaymentsOfDividendsMinorityInterest (4.6)us-gaap_PaymentsOfDividendsMinorityInterest
Cash dividends paid (6.9)us-gaap_PaymentsOfDividends (6.9)us-gaap_PaymentsOfDividends (4.4)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities 1,324.8us-gaap_NetCashProvidedByUsedInFinancingActivities (50.2)us-gaap_NetCashProvidedByUsedInFinancingActivities (34.0)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (13.3)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (2.2)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 1.0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents (240.7)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 36.2us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 58.9us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 490.3us-gaap_CashAndCashEquivalentsAtCarryingValue 454.1us-gaap_CashAndCashEquivalentsAtCarryingValue 395.2us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 249.6us-gaap_CashAndCashEquivalentsAtCarryingValue 490.3us-gaap_CashAndCashEquivalentsAtCarryingValue 454.1us-gaap_CashAndCashEquivalentsAtCarryingValue
Non-cash financing activities:      
Treasury stock purchases settled after period-end $ 0mtx_TreasuryStockPurchasesSettledAfterPeriodEnd $ 0mtx_TreasuryStockPurchasesSettledAfterPeriodEnd $ 1.8mtx_TreasuryStockPurchasesSettledAfterPeriodEnd