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v3.20.2

Other Charges , Net Other Charges, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Other Income and Expenses [Abstract] |  |  |  |
Non-service pension costs (benefits) | $ (3.1) | $ (1.2) | $ (9.0) | $ (3.5)

X
- Definition Represents the pension costs (benefits) excluding service costs. + References No definition available. + Details
Name: | mtd_NonServicePensionCostsBenefits
Namespace Prefix: | mtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration