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Leases Textuals (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019
Operating Lease, Right-of-Use Asset	$ 88,201	$ 92,700
Operating Lease, Liability	88,904	$ 93,500
Lessee Operating Lease Lease Not Yet Commenced Total Contract Value	7,400
Amortization of Operating Lease Right-of-Use Asset	22,800
Change in lease liability cash flow	22,400
Operating Lease, Payments	24,400
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	18,500
Us Operations segment Member
Impact to Segment Total Assets related to the adoption of ASC 842	38,900
Swiss Operations segment Member
Impact to Segment Total Assets related to the adoption of ASC 842	1,100
Western European Operations Segment [Member]
Impact to Segment Total Assets related to the adoption of ASC 842	19,300
Chinese Operations Segment [Member]
Impact to Segment Total Assets related to the adoption of ASC 842	3,400
Other Operations [Member]
Impact to Segment Total Assets related to the adoption of ASC 842	23,700
Corporate Segment [Member]
Impact to Segment Total Assets related to the adoption of ASC 842	$ 1,800

X

- 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

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Balance Type:	debit
Period Type:	duration

X

- 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

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Namespace Prefix:	mtd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The change vs. year-end to Segment Total Assets related to the adoption of AS 842.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The value of the lessee's operating lease that has not yet commenced.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtd_
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Balance Type:	debit
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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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=77888419&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=77888426&loc=SL77918686-209980

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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Period Type:	instant

X

- 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=77888399&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=77888426&loc=SL77918686-209980

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