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Debt (Details)
In Thousands, unless otherwise specified
3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mar. 31, 2015
US Dollar Amounts [Member]
USD ($)
Mar. 31, 2015
Other Principal Trading Currencies [Member]
USD ($)
Mar. 31, 2015
6.3% Senior Notes [Member]
USD ($)
Mar. 31, 2015
6.3% Senior Notes [Member]
US Dollar Amounts [Member]
USD ($)
Mar. 31, 2015
6.3% Senior Notes [Member]
Other Principal Trading Currencies [Member]
USD ($)
Mar. 31, 2015
3.67 Percent Senior Notes [Member]
USD ($)
Mar. 31, 2015
3.67 Percent Senior Notes [Member]
US Dollar Amounts [Member]
USD ($)
Mar. 31, 2015
3.67 Percent Senior Notes [Member]
Other Principal Trading Currencies [Member]
USD ($)
Mar. 31, 2015
4.10% Senior Notes [Member]
USD ($)
Mar. 31, 2015
4.10% Senior Notes [Member]
US Dollar Amounts [Member]
USD ($)
Mar. 31, 2015
4.10% Senior Notes [Member]
Other Principal Trading Currencies [Member]
USD ($)
Mar. 31, 2015
3.84% Senior Notes [Member]
USD ($)
Mar. 31, 2015
3.84% Senior Notes [Member]
US Dollar Amounts [Member]
USD ($)
Mar. 31, 2015
3.84% Senior Notes [Member]
Other Principal Trading Currencies [Member]
USD ($)
Mar. 31, 2015
$ 800 Million Credit Agreement [Member]
USD ($)
Mar. 31, 2015
$ 800 Million Credit Agreement [Member]
US Dollar Amounts [Member]
USD ($)
Mar. 31, 2015
$ 800 Million Credit Agreement [Member]
Other Principal Trading Currencies [Member]
USD ($)
Mar. 31, 2015
Other Local Arrangements [Member]
USD ($)
Mar. 31, 2015
Other Local Arrangements [Member]
US Dollar Amounts [Member]
USD ($)
Mar. 31, 2015
Other Local Arrangements [Member]
Other Principal Trading Currencies [Member]
USD ($)
Mar. 31, 2015
1.47% EURO Senior Notes [Member]
EUR (€)
Debt Instrument [Line Items]                                              
Senior Notes         $ 100,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A63SeniorNotesMember
$ 100,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A63SeniorNotesMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_UsDollarAmountsMember
$ 0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A63SeniorNotesMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_OtherPrincipalTradingCurrenciesMember
$ 50,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A367PercentSeniorNotesMember
$ 50,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A367PercentSeniorNotesMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_UsDollarAmountsMember
$ 0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A367PercentSeniorNotesMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_OtherPrincipalTradingCurrenciesMember
$ 50,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A4.10SeniorNotesMember
$ 50,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A4.10SeniorNotesMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_UsDollarAmountsMember
$ 0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A4.10SeniorNotesMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_OtherPrincipalTradingCurrenciesMember
$ 125,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A3.84SeniorNotesMember
$ 125,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A3.84SeniorNotesMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_UsDollarAmountsMember
$ 0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= mtd_A3.84SeniorNotesMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_OtherPrincipalTradingCurrenciesMember
             
Line of Credit Facility, Amount Outstanding                                 184,179us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mtd_A800MillionCreditAgreementMember
173,170us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mtd_A800MillionCreditAgreementMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_UsDollarAmountsMember
11,009us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= mtd_A800MillionCreditAgreementMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_OtherPrincipalTradingCurrenciesMember
       
Other Borrowings                                       14,693us-gaap_OtherBorrowings
/ us-gaap_DebtInstrumentAxis
= mtd_OtherLocalArrangementsMember
0us-gaap_OtherBorrowings
/ us-gaap_DebtInstrumentAxis
= mtd_OtherLocalArrangementsMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_UsDollarAmountsMember
14,693us-gaap_OtherBorrowings
/ us-gaap_DebtInstrumentAxis
= mtd_OtherLocalArrangementsMember
/ mtd_DebtInstrumentCurrencyAxis
= mtd_OtherPrincipalTradingCurrenciesMember
 
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt                                              
Total debt 523,872us-gaap_DebtLongtermAndShorttermCombinedAmount   498,170us-gaap_DebtLongtermAndShorttermCombinedAmount
/ mtd_DebtInstrumentCurrencyAxis
= mtd_UsDollarAmountsMember
25,702us-gaap_DebtLongtermAndShorttermCombinedAmount
/ mtd_DebtInstrumentCurrencyAxis
= mtd_OtherPrincipalTradingCurrenciesMember
                                     
Less: current portion (114,693)mtd_ShortTermDebtAndLongTermDebtCurrentMaturities (116,164)mtd_ShortTermDebtAndLongTermDebtCurrentMaturities (100,000)mtd_ShortTermDebtAndLongTermDebtCurrentMaturities
/ mtd_DebtInstrumentCurrencyAxis
= mtd_UsDollarAmountsMember
(14,693)mtd_ShortTermDebtAndLongTermDebtCurrentMaturities
/ mtd_DebtInstrumentCurrencyAxis
= mtd_OtherPrincipalTradingCurrenciesMember
                                     
Long-Term Debt                                              
Long-term debt 409,179us-gaap_LongTermDebtNoncurrent 335,790us-gaap_LongTermDebtNoncurrent 398,170us-gaap_LongTermDebtNoncurrent
/ mtd_DebtInstrumentCurrencyAxis
= mtd_UsDollarAmountsMember
11,009us-gaap_LongTermDebtNoncurrent
/ mtd_DebtInstrumentCurrencyAxis
= mtd_OtherPrincipalTradingCurrenciesMember
                                     
Debt Instrument, Face Amount         100,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mtd_A63SeniorNotesMember
    50,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mtd_A367PercentSeniorNotesMember
    50,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mtd_A4.10SeniorNotesMember
    125us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mtd_A3.84SeniorNotesMember
                125,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mtd_A1.47EUROSeniorNotesMember
Debt Instrument, Maturity Date         Jun. 25, 2015     Dec. 17, 2022     Sep. 19, 2023     Sep. 19, 2024                  
Debt Instrument, Interest Rate, Stated Percentage         6.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtd_A63SeniorNotesMember
    3.67%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtd_A367PercentSeniorNotesMember
    4.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtd_A4.10SeniorNotesMember
    3.84%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtd_A3.84SeniorNotesMember
                1.47%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtd_A1.47EUROSeniorNotesMember
Line of Credit Facility, Remaining Borrowing Capacity                                 $ 611,381us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= mtd_A800MillionCreditAgreementMember