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Leases Lease Textuals - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Leases [Abstract] |  |  |
Operating Lease, Expense | $ 39,732 | $ 39,190 | $ 38,900
Lessee Operating Lease Lease Not Yet Commenced Total Contract Value | 15,300 |  |
Amortization of Operating Lease Right-of-Use Asset | 32,100 | 31,100 |
Change in lease liability cash flow | 31,700 | 30,100 |
Operating Lease, Payments | 36,000 | 33,500 |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | $ 35,000 | $ 25,700 |

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- Definition The non-cash change related to the amortization of the operating lease right-of-use asset included in Accruals and other on the Cash Flow Statement. + References No definition available. + Details
Name: | mtd_AmortizationofOperatingLeaseRightofUseAsset
Namespace Prefix: | mtd_
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of increase (decrease) in the lease liability include in Accruals and other in the Statement of Cash Flows. + References No definition available. + Details
Name: | mtd_Changeinleaseliabilitycashflow
Namespace Prefix: | mtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The value of the lessee's operating lease that has not yet commenced. + References No definition available. + Details
Name: | mtd_LesseeOperatingLeaseLeaseNotYetCommencedTotalContractValue
Namespace Prefix: | mtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
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Balance Type: | debit
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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