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Financial Instruments (Details) | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Mar. 31, 2015 Not Designated as Hedging Instrument [Member] USD ($) | Dec. 31, 2014 Not Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2015 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($) | Dec. 31, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($) | Dec. 31, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] EUR (€) | Mar. 31, 2015 3.24% $100 Million Interest Rate Swap [Member] Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2014 3.24% $100 Million Interest Rate Swap [Member] Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2015 2.52% $50 Million Interest Rate Swap [Member] Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2015 2.25% $100 Million Interest Rate Swap [Member] Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2015 Derivative Maturing in 2015 [Member] Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2015 Derivative Maturing in 2015 [Member] Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] EUR (€) | Mar. 31, 2015 Maturing in 2016 [Member] Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2015 Maturing in 2016 [Member] Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] EUR (€)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  | $ 286,900,000 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 325,400,000 invest_DerivativeNotionalAmount / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  | $ 87,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |  | $ 72,600,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = mtd_DerivativeMaturingin2015Member / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | $ 72,400,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = mtd_Maturingin2016Member / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Notional Value Local Currency |  |  |  |  |  |  |  | 71,500,000 mtd_NotionalValueLocalCurrency / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |  | 66,700,000 mtd_NotionalValueLocalCurrency / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = mtd_DerivativeMaturingin2015Member / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 66,500,000 mtd_NotionalValueLocalCurrency / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = mtd_Maturingin2016Member / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Line Of Credit Facility Forecasted Borrowing Amount |  |  |  |  |  |  |  |  | 100,000,000 mtd_LineOfCreditFacilityForecastedBorrowingAmount / us-gaap_DerivativeInstrumentRiskAxis = mtd_A3.24100MillionInterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 50,000,000 mtd_LineOfCreditFacilityForecastedBorrowingAmount / us-gaap_DerivativeInstrumentRiskAxis = mtd_A2.5250MillionInterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 100,000,000 mtd_LineOfCreditFacilityForecastedBorrowingAmount / us-gaap_DerivativeInstrumentRiskAxis = mtd_A2.25100MillionInterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax |  |  |  |  | 22,800,000 us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 300,000 us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  |  | 3.24%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = mtd_A3.24100MillionInterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 2.52%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = mtd_A2.5250MillionInterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 2.25%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = mtd_A2.25100MillionInterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 9,000,000 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  |  |  |  | 0 us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 0 us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  | 0 us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness / us-gaap_DerivativeInstrumentRiskAxis = mtd_A3.24100MillionInterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 0 us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness / us-gaap_DerivativeInstrumentRiskAxis = mtd_A3.24100MillionInterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $ (9,300,000)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments | $ (200,000)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Forecasted borrowings which will be the hedged item in a cash flow hedge. + References No definition available. + Details
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Namespace Prefix: | mtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Notional Value in Local Currency + References No definition available. + Details
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Namespace Prefix: | mtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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- Details
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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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