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Other Charges , Net Other Charges, Net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023
Other Income and Expenses [Abstract]
Non-service pension costs (benefits)	$ 1.9	$ 5.7	$ 5.6

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

X

- References

No definition available.

+ Details

Name:	us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration