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Other Charges , Net Other Charges, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Other Income and Expenses [Abstract]
Non-service pension costs (benefits)	$ 3.4	$ 1.9	$ 6.5	$ 3.8

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